Programs & Examples On #Keyboard

A text input device. Use this tag to ask programming questions related to typing, keyboard hiding and more.

How can you make a custom keyboard in Android?

Here is a sample project for a soft keyboard.

https://developer.android.com/guide/topics/text/creating-input-method.html

Your's should be in the same lines with a different layout.

Edit: If you need the keyboard only in your application, its very simple! Create a linear layout with vertical orientation, and create 3 linear layouts inside it with horizontal orientation. Then place the buttons of each row in each of those horizontal linear layouts, and assign the weight property to the buttons. Use android:layout_weight=1 for all of them, so they get equally spaced.

This will solve. If you didn't get what was expected, please post the code here, and we are here to help you!

How to dismiss keyboard iOS programmatically when pressing return

Try to get an idea about what a first responder is in iOS view hierarchy. When your textfield becomes active(or first responder) when you touch inside it (or pass it the messasge becomeFirstResponder programmatically), it presents the keyboard. So to remove your textfield from being the first responder, you should pass the message resignFirstResponder to it there.

[textField resignFirstResponder];

And to hide the keyboard on its return button, you should implement its delegate method textFieldShouldReturn: and pass the resignFirstResponder message.

- (BOOL)textFieldShouldReturn:(UITextField *)textField{
    [textField resignFirstResponder];
    return YES;
}

Android: show soft keyboard automatically when focus is on an EditText

The problem seems to be that since the place where you enter text is hidden initially (or nested or something), AlertDialog is automatically setting the flag WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM or WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE so that things don't trigger a soft input to show up.

The way that to fix this is to add the following:

(...)
// Create the dialog and show it
Dialog dialog = builder.create()
dialog.show();

// After show (this is important specially if you have a list, a pager or other view that uses a adapter), clear the flags and set the soft input mode
dialog.getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE|WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);
dialog.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);

keycode 13 is for which key

It's the Return or Enter key on keyboard.

Xcode 6: Keyboard does not show up in simulator

If keyboard do not shown up automatically in simulator, just press [Command+K]

or Hardware -> Keyboard -> Toggle Software Keyboard

Move a view up only when the keyboard covers an input field

First of all declare a variable to identify your active UITextField.

Step 1:-

Like as var activeTextField: UITextField?

Step 2:- After this add these two lines in viewDidLoad.

NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow(_:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)

NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide(_:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)

Step 3:-

Now define these two methods in your controller class.

func keyboardWillShow(_ notification: NSNotification) {

    self.scrollView.isScrollEnabled = true
    var info = notification.userInfo!
    let keyboardSize = (info[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.size
    let contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize!.height, 0.0)

    self.scrollView.contentInset = contentInsets
    self.scrollView.scrollIndicatorInsets = contentInsets

    var aRect : CGRect = self.view.frame
    aRect.size.height -= keyboardSize!.height
    if let activeField = self.activeField {
        if (!aRect.contains(activeField.frame.origin)){
            self.scrollView.scrollRectToVisible(activeField.frame, animated: true)
        }
    }
}


func keyboardWillHide(_ notification: NSNotification) {

    let contentInsets : UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, 0.0, 0.0)
    self.scrollView.contentInset = contentInsets
    self.scrollView.scrollIndicatorInsets = contentInsets
    self.view.endEditing(true)
    self.scrollView.isScrollEnabled = true
}


func textFieldDidBeginEditing(_ textField: UITextField){

    activeField = textField
}

func textFieldDidEndEditing(_ textField: UITextField){

    activeField = nil
}

How can I hide the Android keyboard using JavaScript?

There is no way you can hidde the keyboard properly with js because its a OS problem, so one thing you can easy do to "hidde" the keyboard, is instead of using an input Element you can make any "non-input html element" a key listener element just by adding the [tabindex] attribute, and then you can easily listen the keydown and keyup events and store the "$event.target.value" in a variable to get the input.

Disable keyboard on EditText

I found this solution which works for me. It also places the cursor, when clicked on EditText at the correct position.

EditText editText = (EditText)findViewById(R.id.edit_mine);
// set OnTouchListener to consume the touch event
editText.setOnTouchListener(new OnTouchListener() {

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            v.onTouchEvent(event);   // handle the event first
            InputMethodManager imm = (InputMethodManager)v.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
            if (imm != null) {
                imm.hideSoftInputFromWindow(v.getWindowToken(), 0);  // hide the soft keyboard 
            }                
            return true;
        }
    });

Xcode iOS 8 Keyboard types not supported

There is no "Numeric Keypad" for iPads out of the box. When you specify one iPads display the normal keypad with the numeric part displayed. You can switch over to alpha characters, etc. If you want to display a numbers only keyboard for iPad you must implement it yourself.

See here: Number keyboard in iPad?

Phone: numeric keyboard for text input

I think type="number" is the best for semantic web page. If you just want to change the keyboard, you can use type="number" or type="tel". In both cases, iPhone doesn't restrict user input. User can still type in (or paste in) any characters he/she wants. The only change is the keyboard shown to the user. If you want any restriction beyond this, you need to use JavaScript.

Check if a key is down?

Is there a way to detect if a key is currently down in JavaScript?

Nope. The only possibility is monitoring each keyup and keydown and remembering.

after some period of time the key begins to repeat, firing off keydown and keyup events like a fiend.

It shouldn't. You'll definitely get keypress repeating, and in many browsers you'll also get repeated keydown, but if keyup repeats, it's a bug.

Unfortunately it is not a completely unheard-of bug: on Linux, Chromium, and Firefox (when it is being run under GTK+, which it is in popular distros such as Ubuntu) both generate repeating keyup-keypress-keydown sequences for held keys, which are impossible to distinguish from someone hammering the key really fast.

Is it possible to program Android to act as physical USB keyboard?

Most USB keyboards need drivers to run. Any keyboard functionality (non-standard buttons) beyond the capabilities of the standard HID drivers will need to install some software on the computer.

That being said, It may be possible to use Android's USB capabilities, as well as writing a custom driver if default HID is not sufficient, to achieve your goal. It is likely a very non-trivial undertaking.

Edit: I think KristopherMicinski is right that the level of control you get with the stock Android USB API is inadequate for this purpose. His two solutions of modifying the firmware to communicate using HID standards, as well as a hardware middleman that translates from the Android Accessory protocol to HID both seem valid to me. If installing drivers on the computer is out of the question, these may be the only two options.

However, if you're open to installing a driver for this behavior, It should be possible to write a custom driver that can handle Android USB protocol, and correctly translate to the correct calls/interrupts for keyboard functionality. If memory serves, every peripheral keyboard I've used in the last 10 years has needed to install a driver for full functionality, so this may not be considered non-standard behavior. (The though just occurs that this approach will only allow the device to function as a keyboard inside windows, not during the boot process)

Move textfield when keyboard appears swift

The Swift 4 solution I use, takes in keyboard size. Replace serverStatusStackView with whatever view you care about, e.g.: self.view:

deinit {
    NotificationCenter.default.removeObserver(self)
}

@objc func keyboardWillShow(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        serverStatusStackView.frame.origin.y = keyboardSize.height * 2 - serverStatusStackView.frame.height
    }
}

@objc func keyboardWillHide(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        serverStatusStackView.frame.origin.y += keyboardSize.height
    }
}

override func viewDidLoad() {
    super.viewDidLoad()
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)

    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(notification:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}

Simulate Keypress With jQuery

Another option:

$(el).trigger({type: 'keypress', which: 13, keyCode: 13});

http://api.jquery.com/trigger/

How to get keyboard input in pygame?

Try this:

keys=pygame.key.get_pressed()
if keys[K_LEFT]:
    if count == 10:
        location-=1
        count=0
    else:
        count +=1
    if location==-1:
        location=0
if keys[K_RIGHT]:
    if count == 10:
        location+=1
        count=0
    else:
        count +=1
    if location==5:
        location=4

This will mean you only move 1/10 of the time. If it still moves to fast you could try increasing the value you set "count" too.

Run javascript function when user finishes typing instead of on key up?

It's just one line with underscore.js debounce function:

$('#my-input-box').keyup(_.debounce(doSomething , 500));

This basically says doSomething 500 milliseconds after I stop typing.

For more info: http://underscorejs.org/#debounce

Where can I find a list of Mac virtual key codes?

Here's some prebuilt Objective-C dictionaries if anyone wants to type ansi characters:

NSDictionary *lowerCaseCodes = @{
                                @"Q" : @(12),
                                @"W" : @(13),
                                @"E" : @(14),
                                @"R" : @(15),
                                @"T" : @(17),
                                @"Y" : @(16),
                                @"U" : @(32),
                                @"I" : @(34),
                                @"O" : @(31),
                                @"P" : @(35),
                                @"A" : @(0),
                                @"S" : @(1),
                                @"D" : @(2),
                                @"F" : @(3),
                                @"G" : @(5),
                                @"H" : @(4),
                                @"J" : @(38),
                                @"K" : @(40),
                                @"L" : @(37),
                                @"Z" : @(6),
                                @"X" : @(7),
                                @"C" : @(8),
                                @"V" : @(9),
                                @"B" : @(11),
                                @"N" : @(45),
                                @"M" : @(46),
                                @"0" : @(29),
                                @"1" : @(18),
                                @"2" : @(19),
                                @"3" : @(20),
                                @"4" : @(21),
                                @"5" : @(23),
                                @"6" : @(22),
                                @"7" : @(26),
                                @"8" : @(28),
                                @"9" : @(25),
                                @" " : @(49),
                                @"." : @(47),
                                @"," : @(43),
                                @"/" : @(44),
                                @";" : @(41),
                                @"'" : @(39),
                                @"[" : @(33),
                                @"]" : @(30),
                                @"\\" : @(42),
                                @"-" : @(27),
                                @"=" : @(24)
                                };

NSDictionary *shiftCodes = @{ // used in conjunction with the shift key
                                @"<" : @(43),
                                @">" : @(47),
                                @"?" : @(44),
                                @":" : @(41),
                                @"\"" : @(39),
                                @"{" : @(33),
                                @"}" : @(30),
                                @"|" : @(42),
                                @")" : @(29),
                                @"!" : @(18),
                                @"@" : @(19),
                                @"#" : @(20),
                                @"$" : @(21),
                                @"%" : @(23),
                                @"^" : @(22),
                                @"&" : @(26),
                                @"*" : @(28),
                                @"(" : @(25),
                                @"_" : @(27),
                                @"+" : @(24)
                                };

Simplest way to detect keypresses in javascript

Don't over complicate.

  document.addEventListener('keydown', logKey);
    function logKey(e) {
      if (`${e.code}` == "ArrowRight") {
        //code here
      }
          if (`${e.code}` == "ArrowLeft") {
        //code here
      }
          if (`${e.code}` == "ArrowDown") {
        //code here
      }
          if (`${e.code}` == "ArrowUp") {
        //code here
      }
    }

How do I check if a Key is pressed on C++

As mentioned by others there's no cross platform way to do this, but on Windows you can do it like this:

The Code below checks if the key 'A' is down.

if(GetKeyState('A') & 0x8000/*Check if high-order bit is set (1 << 15)*/)
{
    // Do stuff
}

In case of shift or similar you will need to pass one of these: https://msdn.microsoft.com/de-de/library/windows/desktop/dd375731(v=vs.85).aspx

if(GetKeyState(VK_SHIFT) & 0x8000)
{
    // Shift down
}

The low-order bit indicates if key is toggled.

SHORT keyState = GetKeyState(VK_CAPITAL/*(caps lock)*/);
bool isToggled = keyState & 1;
bool isDown = keyState & 0x8000;

Oh and also don't forget to

#include <Windows.h>

How do you tell if caps lock is on using JavaScript?

I wrote a library called capsLock which does exactly what you want it to do.

Just include it on your web pages:

<script src="https://rawgit.com/aaditmshah/capsLock/master/capsLock.js"></script>

Then use it as follows:

alert(capsLock.status);

capsLock.observe(function (status) {
    alert(status);
});

See the demo: http://jsfiddle.net/3EXMd/

The status is updated when you press the Caps Lock key. It only uses the Shift key hack to determine the correct status of the Caps Lock key. Initially the status is false. So beware.

How to dismiss keyboard for UITextView with return key?

I know this has been answered a lot of times, but here are my two cents to the issue.

I found the answers by samvermette and ribeto really useful, and also the comment by maxpower in the ribeto's answer. But there is a problem with those approaches. The problem that matt mentions in the samvermette's answer and it's that if the user wants to paste something with a line break inside it, the keyboard would hide without pasting anything.

So my approach is a mixture of the three above mentioned solutions and only checking if the string entered is a new line when the length of the string is 1 so we make sure the user is typing instead of pasting.

Here is what I have done:

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
    NSRange resultRange = [text rangeOfCharacterFromSet:[NSCharacterSet newlineCharacterSet] options:NSBackwardsSearch];
    if ([text length] == 1 && resultRange.location != NSNotFound) {
        [textView resignFirstResponder];
        return NO;
    }

    return YES;
}

How do I detect if software keyboard is visible on Android Device or not?

I did this as follows, but its relevet only if your goal is to close / open the keyboad.

close example: (checking if keyboard already closed, if not - closing)

imm.showSoftInput(etSearch, InputMethodManager.HIDE_IMPLICIT_ONLY, new ResultReceiver(null) {
                    @Override
                    protected void onReceiveResult(int resultCode, Bundle resultData) {
                        super.onReceiveResult(resultCode, resultData);
                        if (resultCode != InputMethodManager.RESULT_UNCHANGED_HIDDEN)
                            imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
                    }
                });

What is the height of iPhone's onscreen keyboard?

I created this table which contains both the heights of iPhone and iPad keyboards, both for landscape and portrait mode, both with the toolbar on and off.

I even explained how you can use these dimensions in your code here.

Note that you should only use these dimensions if you need to know the keyboard's dimension before you layout the view. Otherwise the solutions from the other answers work better.

enter image description here

How to read keyboard-input?

It seems that you are mixing different Pythons here (Python 2.x vs. Python 3.x)... This is basically correct:

nb = input('Choose a number: ')

The problem is that it is only supported in Python 3. As @sharpner answered, for older versions of Python (2.x), you have to use the function raw_input:

nb = raw_input('Choose a number: ')

If you want to convert that to a number, then you should try:

number = int(nb)

... though you need to take into account that this can raise an exception:

try:
    number = int(nb)
except ValueError:
    print("Invalid number")

And if you want to print the number using formatting, in Python 3 str.format() is recommended:

print("Number: {0}\n".format(number))

Instead of:

print('Number %s \n' % (nb))

But both options (str.format() and %) do work in both Python 2.7 and Python 3.

Android: How do I prevent the soft keyboard from pushing my view up?

This was the best which worked for me

android:windowSoftInputMode="adjustNothing"

Try it!

What's the simplest way of detecting keyboard input in a script from the terminal?

Inspired from code found above (credits), the simple blocking (aka not CPU consuming) macOS version I was looking for:

import termios
import sys
import fcntl
import os

def getKeyCode(blocking = True):
    fd = sys.stdin.fileno()
    oldterm = termios.tcgetattr(fd)
    newattr = termios.tcgetattr(fd)
    newattr[3] = newattr[3] & ~termios.ICANON & ~termios.ECHO
    termios.tcsetattr(fd, termios.TCSANOW, newattr)
    if not blocking:
        oldflags = fcntl.fcntl(fd, fcntl.F_GETFL)
        fcntl.fcntl(fd, fcntl.F_SETFL, oldflags | os.O_NONBLOCK)
    try:
        return ord(sys.stdin.read(1))
    except IOError:
        return 0
    finally:
        termios.tcsetattr(fd, termios.TCSAFLUSH, oldterm)
        if not blocking:
            fcntl.fcntl(fd, fcntl.F_SETFL, oldflags)

def getKeyStroke():
    code  = getKeyCode()
    if code == 27:
        code2 = getKeyCode(blocking = False)
        if code2 == 0:
            return "esc"
        elif code2 == 91:
            code3 = getKeyCode(blocking = False)
            if code3 == 65:
                return "up"
            elif code3 == 66:
                return "down"
            elif code3 == 68:
                return "left"
            elif code3 == 67:
                return "right"
            else:
                return "esc?"
    elif code == 127:
        return "backspace"
    elif code == 9:
        return "tab"
    elif code == 10:
        return "return"
    elif code == 195 or code == 194:        
        code2 = getKeyCode(blocking = False)
        return chr(code)+chr(code2) # utf-8 char
    else:
        return chr(code)


while True:
    print getKeyStroke()

2017-11-09, EDITED: Not tested with Python 3

Getting Keyboard Input

In java we can read input values in 6 ways:

  1. Scanner Class
  2. BufferedReader
  3. Console class
  4. Command line
  5. AWT, String, GUI
  6. System properties
  1. Scanner class: present in java.util.*; package and it has many methods, based your input types you can utilize those methods. a. nextInt() b. nextLong() c. nextFloat() d. nextDouble() e. next() f. nextLine(); etc...
import java.util.Scanner;
public class MyClass {
    public static void main(String args[]) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter a :");
        int a = sc.nextInt();
        System.out.println("Enter b :");
        int b = sc.nextInt();
        
        int c = a + b;
        System.out.println("Result: "+c);
    }
}
  1. BufferedReader class: present in java.io.*; package & it has many method, to read the value from the keyboard use "readLine()" : this method reading one line at a time.
import java.io.BufferedReader;
import java.io.*;
public class MyClass {
    public static void main(String args[]) throws IOException {
       BufferedReader br = new BufferedReader(new BufferedReader(new InputStreamReader(System.in)));
        System.out.println("Enter a :");
        int a = Integer.parseInt(br.readLine());
        System.out.println("Enter b :");
        int b = Integer.parseInt(br.readLine());
        
        int c = a + b;
        System.out.println("Result: "+c);
    }
}

Keylistener in Javascript

The code is

document.addEventListener('keydown', function(event){
    alert(event.keyCode);
} );

This return the ascii code of the key. If you need the key representation, use event.key (This will return 'a', 'o', 'Alt'...)

How can I programmatically check whether a keyboard is present in iOS app?

Swift implementation:

class KeyboardStateListener: NSObject
{
  static var shared = KeyboardStateListener()
  var isVisible = false

  func start() {
    let nc = NSNotificationCenter.defaultCenter()
    nc.addObserver(self, selector: #selector(didShow), name: UIKeyboardDidShowNotification, object: nil)
    nc.addObserver(self, selector: #selector(didHide), name: UIKeyboardDidHideNotification, object: nil)
  }

  func didShow()
  {
    isVisible = true
  }

  func didHide()
  {
    isVisible = false
  } 
}

Because swift doesn't execute class load method on startup it is important to start this service on app launch:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject : AnyObject]?) -> Bool
{
  ...    
  KeyboardStateListener.shared.start() 
}

How to show soft-keyboard when edittext is focused

Sometimes raukodraug's answer won't work. I've make it in this way with some trials and errors:

public static void showKeyboard(Activity activity) {
    if (activity != null) {
        activity.getWindow()
                .setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
    }
}

public static void hideKeyboard(Activity activity) {
    if (activity != null) {
        activity.getWindow()
                .setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
    }
}

And the EditText part:

    editText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            if (!hasFocus) {
                hideKeyboard(getActivity());
            } else {
                showKeyboard(getActivity());
            }
        }
    });

Polling the keyboard (detect a keypress) in python


import sys
import select

def heardEnter():
    i,o,e = select.select([sys.stdin],[],[],0.0001)
    for s in i:
        if s == sys.stdin:
            input = sys.stdin.readline()
            return True
    return False

How do I make an Android EditView 'Done' button and hide the keyboard when clicked?

If you don't want any button at all (e.g. you are developing a GUI for blind people where tap cannot be positional and you rely on single/double/long taps):

text.setItemOptions(EditorInfo.IME_ACTION_NONE)

Or in Kotlin:

text.imeOptions = EditorInfo.IME_ACTION_NONE

Making a UITableView scroll when text field is selected

Easy and fast solution.

I just scroll to the right cell whenever scrolling happens

    - (void)scrollViewDidScroll:(UIScrollView *)scrollView 

Assuming I know table now is in this mode "_keepMyCellOnTop" & I know selected cell "_selectedCellIndex" or scroll to selected cell

- (void)scrollViewDidScroll:(UIScrollView *)scrollView 
{

    if (_keepMyCellOnTop)
    {
        [self.tableView scrollToRowAtIndexPath:_selectedCellIndex atScrollPosition:UITableViewScrollPositionTop animated:NO];
    }
}

This will prevent scrolling.

Placing the code in -(void) scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView will result a scroll up and down

How to know if .keyup() is a character key (jQuery)

If you only need to exclude out enter, escape and spacebar keys, you can do the following:

$("#text1").keyup(function(event) {
if (event.keyCode != '13' && event.keyCode != '27' && event.keyCode != '32') {
     alert('test');
   }
});

See it actions here.

You can refer to the complete list of keycode here for your further modification.

How to force keyboard with numbers in mobile website in Android

Some browsers igoners sending leading zero to the server when the input type is "number". So I use a mixing of jquery and html to load a numeric keypad and also make sure that the value is sent as a text not as a number:

_x000D_
_x000D_
$(document).ready(function(){_x000D_
$(".numberonly").focus(function(){$(this).attr("type","number")});_x000D_
$(".numberonly").blur(function(){$(this).attr("type","text")});_x000D_
})
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<input type="text" class="numberonly">
_x000D_
_x000D_
_x000D_

Detect key input in Python

You could make a little Tkinter app:

import Tkinter as tk

def onKeyPress(event):
    text.insert('end', 'You pressed %s\n' % (event.char, ))

root = tk.Tk()
root.geometry('300x200')
text = tk.Text(root, background='black', foreground='white', font=('Comic Sans MS', 12))
text.pack()
root.bind('<KeyPress>', onKeyPress)
root.mainloop()

prevent iphone default keyboard when focusing an <input>

You can add a callback function to your DatePicker to tell it to blur the input field before showing the DatePicker.

$('.selector').datepicker({
   beforeShow: function(){$('input').blur();}
});

Note: The iOS keyboard will appear for a fraction of a second and then hide.

How to develop a soft keyboard for Android?

A good place to start is the sample application provided on the developer docs.

  • Guidelines would be to just make it as usable as possible. Take a look at the others available on the market to see what you should be aiming for
  • Yes, services can do most things, including internet; provided you have asked for those permissions
  • You can open activities and do anything you like n those if you run into a problem with doing some things in the keyboard. For example HTC's keyboard has a button to open the settings activity, and another to open a dialog to change languages.

Take a look at other IME's to see what you should be aiming for. Some (like the official one) are open source.

How do I show the number keyboard on an EditText in android?

If you need fractional number, then this is the answer for you:

android:inputType="numberDecimal"

Use "ENTER" key on softkeyboard instead of clicking button

may be you could add a attribute to your EditText like this:

android:imeOptions="actionSearch"

iPhone keyboard, Done button and resignFirstResponder

In Xcode 5.1

Enable Done Button

  • In Attributes Inspector for the UITextField in Storyboard find the field "Return Key" and select "Done"

Hide Keyboard when Done is pressed

  • In Storyboard make your ViewController the delegate for the UITextField
  • Add this method to your ViewController

    -(BOOL)textFieldShouldReturn:(UITextField *)textField
    {
        [textField resignFirstResponder];
        return YES;
    }
    

Need table of key codes for android and presenter

List Of Key codes:

a - z-> 29 - 54

"0" - "9"-> 7 - 16

BACK BUTTON - 4, MENU BUTTON - 82

UP-19, DOWN-20, LEFT-21, RIGHT-22

SELECT (MIDDLE) BUTTON - 23

SPACE - 62, SHIFT - 59, ENTER - 66, BACKSPACE - 67

Press Keyboard keys using a batch file

Wow! Mean this that you must learn a different programming language just to send two keys to the keyboard? There are simpler ways for you to achieve the same thing. :-)

The Batch file below is an example that start another program (cmd.exe in this case), send a command to it and then send an Up Arrow key, that cause to recover the last executed command. The Batch file is simple enough to be understand with no problems, so you may modify it to fit your needs.

@if (@CodeSection == @Batch) @then


@echo off

rem Use %SendKeys% to send keys to the keyboard buffer
set SendKeys=CScript //nologo //E:JScript "%~F0"

rem Start the other program in the same Window
start "" /B cmd

%SendKeys% "echo off{ENTER}"

set /P "=Wait and send a command: " < NUL
ping -n 5 -w 1 127.0.0.1 > NUL
%SendKeys% "echo Hello, world!{ENTER}"

set /P "=Wait and send an Up Arrow key: [" < NUL
ping -n 5 -w 1 127.0.0.1 > NUL
%SendKeys% "{UP}"

set /P "=] Wait and send an Enter key:" < NUL
ping -n 5 -w 1 127.0.0.1 > NUL
%SendKeys% "{ENTER}"

%SendKeys% "exit{ENTER}"

goto :EOF


@end


// JScript section

var WshShell = WScript.CreateObject("WScript.Shell");
WshShell.SendKeys(WScript.Arguments(0));

For a list of key names for SendKeys, see: http://msdn.microsoft.com/en-us/library/8c6yea83(v=vs.84).aspx

For example:

LEFT ARROW    {LEFT}
RIGHT ARROW   {RIGHT}

For a further explanation of this solution, see: GnuWin32 openssl s_client conn to WebSphere MQ server not closing at EOF, hangs

Handling key-press events (F1-F12) using JavaScript and jQuery, cross-browser

This works for me.

if(code ==112) { alert("F1 was pressed!!"); return false; }

F2 - 113, F3 - 114, F4 - 115, and so fort.

How to detect the currently pressed key?

Since .NET Framework version 3.0, it is possible to use the Keyboard.IsKeyDown method from the new System.Windows.Input namespace. For instance:

if (((Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl)) && Keyboard.IsKeyDown(Key.F))
{
    // CTRL + F is currently pressed
}

Even though it's part of WPF, that method works fine for WinForm applications (provided that you add references to PresentationCore.dll and WindowsBase.dll). Unfortunately, however, the 3.0 and 3.5 versions of the Keyboard.IsKeyDown method did not work for WinForm applications. Therefore, if you do want to use it in a WinForm application, you'll need to be targeting .NET Framework 4.0 or later in order for it to work.

Binding arrow keys in JS/jQuery

$(document).keydown(function(e){
    if (e.which == 37) { 
       alert("left pressed");
       return false;
    }
});

Character codes:

37 - left

38 - up

39 - right

40 - down

What is the difference between 127.0.0.1 and localhost

There is nothing different. One is easier to remember than the other. Generally, you define a name to associate with an IP address. You don't have to specify localhost for 127.0.0.1, you could specify any name you want.

How to set default value to all keys of a dict object in python?

Use defaultdict

from collections import defaultdict
a = {} 
a = defaultdict(lambda:0,a)
a["anything"] # => 0

This is very useful for case like this,where default values for every key is set as 0:

results ={ 'pre-access' : {'count': 4, 'pass_count': 2},'no-access' : {'count': 55, 'pass_count': 19}
for k,v in results.iteritems():
  a['count'] += v['count']
  a['pass_count'] += v['pass_count']

What is difference between mutable and immutable String in java

Mutable means you will save the same reference to variable and change its contents but immutable you can not change contents but you will declare new reference contains the new and the old value of the variable

Ex Immutable -> String

String x = "value0ne";// adresse one x += "valueTwo"; //an other adresse {adresse two} adresse on the heap memory change.

Mutable -> StringBuffer - StringBuilder StringBuilder sb = new StringBuilder(); sb.append("valueOne"); // adresse One sb.append("valueTwo"); // adresse One

sb still in the same adresse i hope this comment helps

Greyscale Background Css Images

You don't need to use complicated coding really!

Greyscale Hover:

-webkit-filter: grayscale(100%);

Greyscale "Hover-out":

-webkit-filter: grayscale(0%);


I simply made my css class have a separate hover class and added in the second greyscale. It's really simple if you really don't like complexity.

Ruby: How to turn a hash into HTTP parameters?

I know this is an old question, but I just wanted to post this bit of code as I could not find a simple gem to do just this task for me.

module QueryParams

  def self.encode(value, key = nil)
    case value
    when Hash  then value.map { |k,v| encode(v, append_key(key,k)) }.join('&')
    when Array then value.map { |v| encode(v, "#{key}[]") }.join('&')
    when nil   then ''
    else            
      "#{key}=#{CGI.escape(value.to_s)}" 
    end
  end

  private

  def self.append_key(root_key, key)
    root_key.nil? ? key : "#{root_key}[#{key.to_s}]"
  end
end

Rolled up as gem here: https://github.com/simen/queryparams

How to place Text and an Image next to each other in HTML?

You want to use css float for this, you can put it directly in your code.

<body>
<img src="website_art.png" height= "75" width="235" style="float:left;"/>
<h3 style="float:right;">The Art of Gaming</h3>
</body>

But I would really suggest learning the basics of css and splitting all your styling out to a separate style sheet, and use classes. It will help you in the future. A good place to start is w3schools or, perhaps later down the path, Mozzila Dev. Network (MDN).

HTML:

<body>
  <img src="website_art.png" class="myImage"/>
  <h3 class="heading">The Art of Gaming</h3>
</body>

CSS:

.myImage {
  float: left;
  height: 75px;
  width: 235px;
  font-family: Veranda;
}
.heading {
  float:right;
}

How to convert a "dd/mm/yyyy" string to datetime in SQL Server?

SELECT convert(varchar(10), '23/07/2009', 111)

The infamous java.sql.SQLException: No suitable driver found

I was having the same issue with mysql datasource using spring data that would work outside but gave me this error when deployed on tomcat.

The error went away when I added the driver jar mysql-connector-java-8.0.16.jar to the jres lib/ext folder

However I did not want to do this in production for fear of interfering with other applications. Explicity defining the driver class solved this issue for me

    spring.datasource.driver-class-name: com.mysql.cj.jdbc.Driver

Using CSS td width absolute, position

If table width is for example 100%, try using a percentage width on td such as 20%.

Add a column to existing table and uniquely number them on MS SQL Server

Just using an ALTER TABLE should work. Add the column with the proper type and an IDENTITY flag and it should do the trick

Check out this MSDN article http://msdn.microsoft.com/en-us/library/aa275462(SQL.80).aspx on the ALTER TABLE syntax

DataFrame constructor not properly called! error

You are providing a string representation of a dict to the DataFrame constructor, and not a dict itself. So this is the reason you get that error.

So if you want to use your code, you could do:

df = DataFrame(eval(data))

But better would be to not create the string in the first place, but directly putting it in a dict. Something roughly like:

data = []
for row in result_set:
    data.append({'value': row["tag_expression"], 'key': row["tag_name"]})

But probably even this is not needed, as depending on what is exactly in your result_set you could probably:

  • provide this directly to a DataFrame: DataFrame(result_set)
  • or use the pandas read_sql_query function to do this for you (see docs on this)

How to include a PHP variable inside a MySQL statement

The best option is prepared statements. Messing around with quotes and escapes is harder work to begin with, and difficult to maintain. Sooner or later you will end up accidentally forgetting to quote something or end up escaping the same string twice, or mess up something like that. Might be years before you find those type of bugs.

http://php.net/manual/en/pdo.prepared-statements.php

How to Reload ReCaptcha using JavaScript?

Or you could just simulate a click on the refresh button

// If recaptcha object exists, refresh it
    if (typeof Recaptcha != "undefined") {
      jQuery('#recaptcha_reload').click();
    }

How to develop a soft keyboard for Android?

Create Custom Key Board for Own EditText

Download Entire Code

In this post i Created Simple Keyboard which contains Some special keys like ( France keys ) and it's supported Capital letters and small letters and Number keys and some Symbols .

package sra.keyboard;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.view.View.OnClickListener;
import android.view.View.OnFocusChangeListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RelativeLayout;

public class Main extends Activity implements OnTouchListener, OnClickListener,
  OnFocusChangeListener {
 private EditText mEt, mEt1; // Edit Text boxes
 private Button mBSpace, mBdone, mBack, mBChange, mNum;
 private RelativeLayout mLayout, mKLayout;
 private boolean isEdit = false, isEdit1 = false;
 private String mUpper = "upper", mLower = "lower";
 private int w, mWindowWidth;
 private String sL[] = { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j",
   "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w",
   "x", "y", "z", "ç", "à", "é", "è", "û", "î" };
 private String cL[] = { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J",
   "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W",
   "X", "Y", "Z", "ç", "à", "é", "è", "û", "î" };
 private String nS[] = { "!", ")", "'", "#", "3", "$", "%", "&", "8", "*",
   "?", "/", "+", "-", "9", "0", "1", "4", "@", "5", "7", "(", "2",
   "\"", "6", "_", "=", "]", "[", "<", ">", "|" };
 private Button mB[] = new Button[32];

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  try {
   setContentView(R.layout.main);
   // adjusting key regarding window sizes
   setKeys();
   setFrow();
   setSrow();
   setTrow();
   setForow();
   mEt = (EditText) findViewById(R.id.xEt);
   mEt.setOnTouchListener(this);
   mEt.setOnFocusChangeListener(this);
   mEt1 = (EditText) findViewById(R.id.et1);

   mEt1.setOnTouchListener(this);
   mEt1.setOnFocusChangeListener(this);
   mEt.setOnClickListener(this);
   mEt1.setOnClickListener(this);
   mLayout = (RelativeLayout) findViewById(R.id.xK1);
   mKLayout = (RelativeLayout) findViewById(R.id.xKeyBoard);

  } catch (Exception e) {
   Log.w(getClass().getName(), e.toString());
  }

 }

 @Override
 public boolean onTouch(View v, MotionEvent event) {
  if (v == mEt) {
   hideDefaultKeyboard();
   enableKeyboard();

  }
  if (v == mEt1) {
   hideDefaultKeyboard();
   enableKeyboard();

  }
  return true;
 }

 @Override
 public void onClick(View v) {

  if (v == mBChange) {

   if (mBChange.getTag().equals(mUpper)) {
    changeSmallLetters();
    changeSmallTags();
   } else if (mBChange.getTag().equals(mLower)) {
    changeCapitalLetters();
    changeCapitalTags();
   }

  } else if (v != mBdone && v != mBack && v != mBChange && v != mNum) {
   addText(v);

  } else if (v == mBdone) {

   disableKeyboard();

  } else if (v == mBack) {
   isBack(v);
  } else if (v == mNum) {
   String nTag = (String) mNum.getTag();
   if (nTag.equals("num")) {
    changeSyNuLetters();
    changeSyNuTags();
    mBChange.setVisibility(Button.INVISIBLE);

   }
   if (nTag.equals("ABC")) {
    changeCapitalLetters();
    changeCapitalTags();
   }

  }

 }

 @Override
 public void onFocusChange(View v, boolean hasFocus) {
  if (v == mEt && hasFocus == true) {
   isEdit = true;
   isEdit1 = false;

  } else if (v == mEt1 && hasFocus == true) {
   isEdit = false;
   isEdit1 = true;

  }

 }

 private void addText(View v) {
  if (isEdit == true) {
   String b = "";
   b = (String) v.getTag();
   if (b != null) {
    // adding text in Edittext
    mEt.append(b);

   }
  }

  if (isEdit1 == true) {
   String b = "";
   b = (String) v.getTag();
   if (b != null) {
    // adding text in Edittext
    mEt1.append(b);

   }

  }

 }

 private void isBack(View v) {
  if (isEdit == true) {
   CharSequence cc = mEt.getText();
   if (cc != null && cc.length() > 0) {
    {
     mEt.setText("");
     mEt.append(cc.subSequence(0, cc.length() - 1));
    }

   }
  }

  if (isEdit1 == true) {
   CharSequence cc = mEt1.getText();
   if (cc != null && cc.length() > 0) {
    {
     mEt1.setText("");
     mEt1.append(cc.subSequence(0, cc.length() - 1));
    }
   }
  }
 }
 private void changeSmallLetters() {
  mBChange.setVisibility(Button.VISIBLE);
  for (int i = 0; i < sL.length; i++)
   mB[i].setText(sL[i]);
  mNum.setTag("12#");
 }
 private void changeSmallTags() {
  for (int i = 0; i < sL.length; i++)
   mB[i].setTag(sL[i]);
  mBChange.setTag("lower");
  mNum.setTag("num");
 }
 private void changeCapitalLetters() {
  mBChange.setVisibility(Button.VISIBLE);
  for (int i = 0; i < cL.length; i++)
   mB[i].setText(cL[i]);
  mBChange.setTag("upper");
  mNum.setText("12#");

 }

 private void changeCapitalTags() {
  for (int i = 0; i < cL.length; i++)
   mB[i].setTag(cL[i]);
  mNum.setTag("num");

 }

 private void changeSyNuLetters() {

  for (int i = 0; i < nS.length; i++)
   mB[i].setText(nS[i]);
  mNum.setText("ABC");
 }

 private void changeSyNuTags() {
  for (int i = 0; i < nS.length; i++)
   mB[i].setTag(nS[i]);
  mNum.setTag("ABC");
 }

 // enabling customized keyboard
 private void enableKeyboard() {

  mLayout.setVisibility(RelativeLayout.VISIBLE);
  mKLayout.setVisibility(RelativeLayout.VISIBLE);

 }

 // Disable customized keyboard
 private void disableKeyboard() {
  mLayout.setVisibility(RelativeLayout.INVISIBLE);
  mKLayout.setVisibility(RelativeLayout.INVISIBLE);

 }

 private void hideDefaultKeyboard() {
  getWindow().setSoftInputMode(
    WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

 }

 private void setFrow() {
  w = (mWindowWidth / 13);
  w = w - 15;
  mB[16].setWidth(w);
  mB[22].setWidth(w + 3);
  mB[4].setWidth(w);
  mB[17].setWidth(w);
  mB[19].setWidth(w);
  mB[24].setWidth(w);
  mB[20].setWidth(w);
  mB[8].setWidth(w);
  mB[14].setWidth(w);
  mB[15].setWidth(w);
  mB[16].setHeight(50);
  mB[22].setHeight(50);
  mB[4].setHeight(50);
  mB[17].setHeight(50);
  mB[19].setHeight(50);
  mB[24].setHeight(50);
  mB[20].setHeight(50);
  mB[8].setHeight(50);
  mB[14].setHeight(50);
  mB[15].setHeight(50);

 }

 private void setSrow() {
  w = (mWindowWidth / 10);
  mB[0].setWidth(w);
  mB[18].setWidth(w);
  mB[3].setWidth(w);
  mB[5].setWidth(w);
  mB[6].setWidth(w);
  mB[7].setWidth(w);
  mB[26].setWidth(w);
  mB[9].setWidth(w);
  mB[10].setWidth(w);
  mB[11].setWidth(w);
  mB[26].setWidth(w);

  mB[0].setHeight(50);
  mB[18].setHeight(50);
  mB[3].setHeight(50);
  mB[5].setHeight(50);
  mB[6].setHeight(50);
  mB[7].setHeight(50);
  mB[9].setHeight(50);
  mB[10].setHeight(50);
  mB[11].setHeight(50);
  mB[26].setHeight(50);
 }

 private void setTrow() {
  w = (mWindowWidth / 12);
  mB[25].setWidth(w);
  mB[23].setWidth(w);
  mB[2].setWidth(w);
  mB[21].setWidth(w);
  mB[1].setWidth(w);
  mB[13].setWidth(w);
  mB[12].setWidth(w);
  mB[27].setWidth(w);
  mB[28].setWidth(w);
  mBack.setWidth(w);

  mB[25].setHeight(50);
  mB[23].setHeight(50);
  mB[2].setHeight(50);
  mB[21].setHeight(50);
  mB[1].setHeight(50);
  mB[13].setHeight(50);
  mB[12].setHeight(50);
  mB[27].setHeight(50);
  mB[28].setHeight(50);
  mBack.setHeight(50);

 }

 private void setForow() {
  w = (mWindowWidth / 10);
  mBSpace.setWidth(w * 4);
  mBSpace.setHeight(50);
  mB[29].setWidth(w);
  mB[29].setHeight(50);

  mB[30].setWidth(w);
  mB[30].setHeight(50);

  mB[31].setHeight(50);
  mB[31].setWidth(w);
  mBdone.setWidth(w + (w / 1));
  mBdone.setHeight(50);

 }

 private void setKeys() {
  mWindowWidth = getWindowManager().getDefaultDisplay().getWidth(); // getting
  // window
  // height
  // getting ids from xml files
  mB[0] = (Button) findViewById(R.id.xA);
  mB[1] = (Button) findViewById(R.id.xB);
  mB[2] = (Button) findViewById(R.id.xC);
  mB[3] = (Button) findViewById(R.id.xD);
  mB[4] = (Button) findViewById(R.id.xE);
  mB[5] = (Button) findViewById(R.id.xF);
  mB[6] = (Button) findViewById(R.id.xG);
  mB[7] = (Button) findViewById(R.id.xH);
  mB[8] = (Button) findViewById(R.id.xI);
  mB[9] = (Button) findViewById(R.id.xJ);
  mB[10] = (Button) findViewById(R.id.xK);
  mB[11] = (Button) findViewById(R.id.xL);
  mB[12] = (Button) findViewById(R.id.xM);
  mB[13] = (Button) findViewById(R.id.xN);
  mB[14] = (Button) findViewById(R.id.xO);
  mB[15] = (Button) findViewById(R.id.xP);
  mB[16] = (Button) findViewById(R.id.xQ);
  mB[17] = (Button) findViewById(R.id.xR);
  mB[18] = (Button) findViewById(R.id.xS);
  mB[19] = (Button) findViewById(R.id.xT);
  mB[20] = (Button) findViewById(R.id.xU);
  mB[21] = (Button) findViewById(R.id.xV);
  mB[22] = (Button) findViewById(R.id.xW);
  mB[23] = (Button) findViewById(R.id.xX);
  mB[24] = (Button) findViewById(R.id.xY);
  mB[25] = (Button) findViewById(R.id.xZ);
  mB[26] = (Button) findViewById(R.id.xS1);
  mB[27] = (Button) findViewById(R.id.xS2);
  mB[28] = (Button) findViewById(R.id.xS3);
  mB[29] = (Button) findViewById(R.id.xS4);
  mB[30] = (Button) findViewById(R.id.xS5);
  mB[31] = (Button) findViewById(R.id.xS6);
  mBSpace = (Button) findViewById(R.id.xSpace);
  mBdone = (Button) findViewById(R.id.xDone);
  mBChange = (Button) findViewById(R.id.xChange);
  mBack = (Button) findViewById(R.id.xBack);
  mNum = (Button) findViewById(R.id.xNum);
  for (int i = 0; i < mB.length; i++)
   mB[i].setOnClickListener(this);
  mBSpace.setOnClickListener(this);
  mBdone.setOnClickListener(this);
  mBack.setOnClickListener(this);
  mBChange.setOnClickListener(this);
  mNum.setOnClickListener(this);

 }

}

Error - replacement has [x] rows, data has [y]

The answer by @akrun certainly does the trick. For future googlers who want to understand why, here is an explanation...

The new variable needs to be created first.

The variable "valueBin" needs to be already in the df in order for the conditional assignment to work. Essentially, the syntax of the code is correct. Just add one line in front of the code chuck to create this name --

df$newVariableName <- NA

Then you continue with whatever conditional assignment rules you have, like

df$newVariableName[which(df$oldVariableName<=250)] <- "<=250"

I blame whoever wrote that package's error message... The debugging was made especially confusing by that error message. It is irrelevant information that you have two arrays in the df with different lengths. No. Simply create the new column first. For more details, consult this post https://www.r-bloggers.com/translating-weird-r-errors/

Set a request header in JavaScript

@gnarf answer is right . wanted to add more information .

Mozilla Bug Reference : https://bugzilla.mozilla.org/show_bug.cgi?id=627942

Terminate these steps if header is a case-insensitive match for one of the following headers:

Accept-Charset
Accept-Encoding
Access-Control-Request-Headers
Access-Control-Request-Method
Connection
Content-Length
Cookie
Cookie2
Date
DNT
Expect
Host
Keep-Alive
Origin
Referer
TE
Trailer
Transfer-Encoding
Upgrade
User-Agent
Via

Source : https://dvcs.w3.org/hg/xhr/raw-file/tip/Overview.html#dom-xmlhttprequest-setrequestheader

node.js TypeError: path must be absolute or specify root to res.sendFile [failed to parse JSON]

If you trust the path, path.resolve is an option:

var path = require('path');

// All other routes should redirect to the index.html
  app.route('/*')
    .get(function(req, res) {
      res.sendFile(path.resolve(app.get('appPath') + '/index.html'));
    });

Remove Primary Key in MySQL

I believe Quassnoi has answered your direct question. Just a side note: Maybe this is just some awkward wording on your part, but you seem to be under the impression that you have three primary keys, one on each field. This is not the case. By definition, you can only have one primary key. What you have here is a primary key that is a composite of three fields. Thus, you cannot "drop the primary key on a column". You can drop the primary key, or not drop the primary key. If you want a primary key that only includes one column, you can drop the existing primary key on 3 columns and create a new primary key on 1 column.

How to display tables on mobile using Bootstrap?

All tables within bootstrap stretch according to the container they're in. You can put your tables inside a .span element to control the size. This SO Question may help you out

Why do Twitter Bootstrap tables always have 100% width?

JSLint says "missing radix parameter"

Adding the following on top of your JS file will tell JSHint to supress the radix warning:

/*jshint -W065 */

See also: http://jshint.com/docs/#options

How to press/click the button using Selenium if the button does not have the Id?

In Selenium IDE you can do:

Command   |   clickAndWait
Target    |   //input[@value='Next' and @title='next']

It should work fine.

Razor View Without Layout

You (and KMulligan) are misunderstanding _ViewStart pages.

_ViewStart will always execute, before your page starts.
It is intended to be used to initialize properties (such as Layout); it generally should not contain markup. (Since there is no way to override it).

The correct pattern is to make a separate layout page which calls RenderBody, and set the Layout property to point to this page in _ViewStart.

You can then change Layout in your content pages, and the changes will take effect.

C# Linq Group By on multiple columns

var consolidatedChildren =
    from c in children
    group c by new
    {
        c.School,
        c.Friend,
        c.FavoriteColor,
    } into gcs
    select new ConsolidatedChild()
    {
        School = gcs.Key.School,
        Friend = gcs.Key.Friend,
        FavoriteColor = gcs.Key.FavoriteColor,
        Children = gcs.ToList(),
    };

var consolidatedChildren =
    children
        .GroupBy(c => new
        {
            c.School,
            c.Friend,
            c.FavoriteColor,
        })
        .Select(gcs => new ConsolidatedChild()
        {
            School = gcs.Key.School,
            Friend = gcs.Key.Friend,
            FavoriteColor = gcs.Key.FavoriteColor,
            Children = gcs.ToList(),
        });

SSRS - Checking whether the data is null

try like this

= IIF( MAX( iif( IsNothing(Fields!.Reading.Value ), -1, Fields!.Reading.Value ) ) = -1, "",  FormatNumber(  MAX( iif( IsNothing(Fields!.Reading.Value ), -1, Fields!.Reading.Value ), "CellReading_Reading"),3)) )

Using ZXing to create an Android barcode scanning app

The ZXing project provides a standalone barcode reader application which — via Android's intent mechanism — can be called by other applications who wish to integrate barcode scanning.

The easiest way to do this is to call the ZXing SCAN Intent from your application, like this:

public Button.OnClickListener mScan = new Button.OnClickListener() {
    public void onClick(View v) {
        Intent intent = new Intent("com.google.zxing.client.android.SCAN");
        intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
        startActivityForResult(intent, 0);
    }
};

public void onActivityResult(int requestCode, int resultCode, Intent intent) {
    if (requestCode == 0) {
        if (resultCode == RESULT_OK) {
            String contents = intent.getStringExtra("SCAN_RESULT");
            String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
            // Handle successful scan
        } else if (resultCode == RESULT_CANCELED) {
            // Handle cancel
        }
    }
}

Pressing the button linked to mScan would launch directly into the ZXing barcode scanner screen (or crash if ZXing isn't installed). Once a barcode has been recognised, you'll receive the result in your Activity, here in the contents variable.

To avoid the crashing and simplify things for you, ZXing have provided a utility class which you could integrate into your application to make the installation of ZXing smoother, by redirecting the user to the Android Market if they don't have it installed already.

Finally, if you want to integrate barcode scanning directly into your application without relying on having the separate ZXing application installed, well then it's an open source project and you can do so! :)


Edit: Somebody edited this guide into this answer (it sounds a bit odd, I can't vouch as to its accuracy, and I'm not sure why they're using Eclipse in 2015):

Step by step to setup zxing 3.2.1 in eclipse

  1. Download zxing-master.zip from "https://github.com/zxing/zxing"
  2. Unzip zxing-master.zip, Use eclipse to import "android" project in zxing-master
  3. Download core-3.2.1.jar from "http://repo1.maven.org/maven2/com/google/zxing/core/3.2.1/"
  4. Create "libs" folder in "android" project and paste cor-3.2.1.jar into the libs folder
  5. Click on project: choose "properties" -> "Java Compiler" to change level to 1.7. Then click on "Android" change "Project build target" to android 4.4.2+, because using 1.7 requires compiling with Android 4.4
  6. If "CameraConfigurationUtils.java" don't exist in "zxing-master/android/app/src/main/java/com/google/zxing/client/android/camera/". You can copy it from "zxing-master/android-core/src/main/java/com/google/zxing/client/android/camera/" and paste to your project.
  7. Clean and build project. If your project show error about "switch - case", you should change them to "if - else".
  8. Completed. Clean and build project. You can click on "Proprties" > "Android" > click on "Is Libraries" to use for your project.

What does "subject" mean in certificate?

Subject is the certificate's common name and is a critical property for the certificate in a lot of cases if it's a server certificate and clients are looking for a positive identification.

As an example on an SSL certificate for a web site the subject would be the domain name of the web site.

Get path from open file in Python

The key here is the name attribute of the f object representing the opened file. You get it like that:

>>> f = open('/Users/Desktop/febROSTER2012.xls')
>>> f.name
'/Users/Desktop/febROSTER2012.xls'

Does it help?

Ruby: What is the easiest way to remove the first element from an array?

"pop"ing the first element of an Array is called "shift" ("unshift" being the operation of adding one element in front of the array).

How to remove gaps between subplots in matplotlib?

With recent matplotlib versions you might want to try Constrained Layout. This does not work with plt.subplot() however, so you need to use plt.subplots() instead:

fig, axs = plt.subplots(4, 4, constrained_layout=True)

Adding Only Untracked Files

git ls-files -o --exclude-standard gives untracked files, so you can do something like below ( or add an alias to it):

git add $(git ls-files -o --exclude-standard)

Clearing all cookies with JavaScript

function deleteAllCookies() {
    var cookies = document.cookie.split(";");

    for (var i = 0; i < cookies.length; i++) {
        var cookie = cookies[i];
        var eqPos = cookie.indexOf("=");
        var name = eqPos > -1 ? cookie.substr(0, eqPos) : cookie;
        document.cookie = name + "=;expires=Thu, 01 Jan 1970 00:00:00 GMT";
    }
}

Note that this code has two limitations:

  • It will not delete cookies with HttpOnly flag set, as the HttpOnly flag disables Javascript's access to the cookie.
  • It will not delete cookies that have been set with a Path value. (This is despite the fact that those cookies will appear in document.cookie, but you can't delete it without specifying the same Path value with which it was set.)

PHP error: "The zip extension and unzip command are both missing, skipping."

I had PHP7.2 on a Ubuntu 16.04 server and it solved my problem:

sudo apt-get install zip unzip php-zip

Update

Tried this for Ubuntu 18.04 and worked as well.

Docker-Compose can't connect to Docker Daemon

One way to resolve this would be to first add your user to the docker group by running the following

sudo usermod -aG docker $USER

IMPORTANT: Remember to log out of your system (not just your terminal) and back in for this to take effect!

Getting "Could not find function xmlCheckVersion in library libxml2. Is libxml2 installed?" when installing lxml through pip

set STATICBUILD=true && pip install lxml

run this command instead, must have VS C++ compiler installed first

https://blogs.msdn.microsoft.com/pythonengineering/2016/04/11/unable-to-find-vcvarsall-bat/

It works for me with Python 3.5.2 and Windows 7

Detect click inside/outside of element with single event handler

This question can be answered with X and Y coordinates and without JQuery:

       var isPointerEventInsideElement = function (event, element) {
            var pos = {
                x: event.targetTouches ? event.targetTouches[0].pageX : event.pageX,
                y: event.targetTouches ? event.targetTouches[0].pageY : event.pageY
            };
            var rect = element.getBoundingClientRect();
            return  pos.x < rect.right && pos.x > rect.left && pos.y < rect.bottom && pos.y > rect.top;
        };

        document.querySelector('#my-element').addEventListener('click', function (event) {
           console.log(isPointerEventInsideElement(event, document.querySelector('#my-any-child-element')))
        });

Add items in array angular 4

Your empList is object type but you are trying to push strings

Try this

this.empList.push({this.name,this.empoloyeeID});

How to change RGB color to HSV?

This is the VB.net version which works fine for me ported from the C code in BlaM's post.

There's a C implementation here:

http://www.cs.rit.edu/~ncs/color/t_convert.html

Should be very straightforward to convert to C#, as almost no functions are called - just > calculations.


Public Sub HSVtoRGB(ByRef r As Double, ByRef g As Double, ByRef b As Double, ByVal h As Double, ByVal s As Double, ByVal v As Double)
    Dim i As Integer
    Dim f, p, q, t As Double

    If (s = 0) Then
        ' achromatic (grey)
        r = v
        g = v
        b = v
        Exit Sub
    End If

    h /= 60 'sector 0 to 5
    i = Math.Floor(h)
    f = h - i 'factorial part of h
    p = v * (1 - s)
    q = v * (1 - s * f)
    t = v * (1 - s * (1 - f))

    Select Case (i)
        Case 0
            r = v
            g = t
            b = p
            Exit Select
        Case 1
            r = q
            g = v
            b = p
            Exit Select
        Case 2
            r = p
            g = v
            b = t
            Exit Select
        Case 3
            r = p
            g = q
            b = v
            Exit Select
        Case 4
            r = t
            g = p
            b = v
            Exit Select
        Case Else   'case 5:
            r = v
            g = p
            b = q
            Exit Select
    End Select
End Sub

Difference between numpy dot() and Python 3.5+ matrix multiplication @

In mathematics, I think the dot in numpy makes more sense

dot(a,b)_{i,j,k,a,b,c} = formula

since it gives the dot product when a and b are vectors, or the matrix multiplication when a and b are matrices


As for matmul operation in numpy, it consists of parts of dot result, and it can be defined as

>matmul(a,b)_{i,j,k,c} = formula

So, you can see that matmul(a,b) returns an array with a small shape, which has smaller memory consumption and make more sense in applications. In particular, combining with broadcasting, you can get

matmul(a,b)_{i,j,k,l} = formula

for example.


From the above two definitions, you can see the requirements to use those two operations. Assume a.shape=(s1,s2,s3,s4) and b.shape=(t1,t2,t3,t4)

  • To use dot(a,b) you need

    1. t3=s4;
  • To use matmul(a,b) you need

    1. t3=s4
    2. t2=s2, or one of t2 and s2 is 1
    3. t1=s1, or one of t1 and s1 is 1

Use the following piece of code to convince yourself.

Code sample

import numpy as np
for it in xrange(10000):
    a = np.random.rand(5,6,2,4)
    b = np.random.rand(6,4,3)
    c = np.matmul(a,b)
    d = np.dot(a,b)
    #print 'c shape: ', c.shape,'d shape:', d.shape

    for i in range(5):
        for j in range(6):
            for k in range(2):
                for l in range(3):
                    if not c[i,j,k,l] == d[i,j,k,j,l]:
                        print it,i,j,k,l,c[i,j,k,l]==d[i,j,k,j,l] #you will not see them

How do you upload a file to a document library in sharepoint?

You can upload documents to SharePoint libraries using the Object Model or SharePoint Webservices.

Upload using Object Model:

String fileToUpload = @"C:\YourFile.txt";
String sharePointSite = "http://yoursite.com/sites/Research/";
String documentLibraryName = "Shared Documents";

using (SPSite oSite = new SPSite(sharePointSite))
{
    using (SPWeb oWeb = oSite.OpenWeb())
    {
        if (!System.IO.File.Exists(fileToUpload))
            throw new FileNotFoundException("File not found.", fileToUpload);                    

        SPFolder myLibrary = oWeb.Folders[documentLibraryName];

        // Prepare to upload
        Boolean replaceExistingFiles = true;
        String fileName = System.IO.Path.GetFileName(fileToUpload);
        FileStream fileStream = File.OpenRead(fileToUpload);

        // Upload document
        SPFile spfile = myLibrary.Files.Add(fileName, fileStream, replaceExistingFiles);

        // Commit 
        myLibrary.Update();
    }
}

Download multiple files with a single action

A jQuery version of the iframe answers:

function download(files) {
    $.each(files, function(key, value) {
        $('<iframe></iframe>')
            .hide()
            .attr('src', value)
            .appendTo($('body'))
            .load(function() {
                var that = this;
                setTimeout(function() {
                    $(that).remove();
                }, 100);
            });
    });
}

Android Support Design TabLayout: Gravity Center and Mode Scrollable

I created an AdaptiveTabLayout class to achieve this. This was the only way I found to actually solve the problem, answer the question and avoid/workaround problems that other answers here don't.

Notes:

  • Handles phone/tablet layouts.
  • Handles cases where there's enough room for MODE_SCROLLABLE but not enough room for MODE_FIXED. If you don't handle this case it's gonna happen on some devices you'll see different text sizes or oven two lines of text in some tabs, which looks bad.
  • It gets real measures and doesn't make any assumptions (like screen is 360dp wide or whatever...). This works with real screen sizes and real tab sizes. This means works well with translations because doesn't assume any tab size, the tabs get measure.
  • Deals with the different passes on the onLayout phase in order to avoid extra work.
  • Layout width needs to be wrap_content on the xml. Don't set any mode or gravity on the xml.

AdaptiveTabLayout.java

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;
import android.util.AttributeSet;
import android.widget.LinearLayout;

public class AdaptiveTabLayout extends TabLayout
{
    private boolean mGravityAndModeSeUpNeeded = true;

    public AdaptiveTabLayout(@NonNull final Context context)
    {
        this(context, null);
    }

    public AdaptiveTabLayout(@NonNull final Context context, @Nullable final AttributeSet attrs)
    {
        this(context, attrs, 0);
    }

    public AdaptiveTabLayout
    (
            @NonNull final Context context,
            @Nullable final AttributeSet attrs,
            final int defStyleAttr
    )
    {
        super(context, attrs, defStyleAttr);
        setTabMode(MODE_SCROLLABLE);
    }

    @Override
    protected void onLayout(final boolean changed, final int l, final int t, final int r, final int b)
    {
        super.onLayout(changed, l, t, r, b);

        if (mGravityAndModeSeUpNeeded)
        {
            setModeAndGravity();
        }
    }

    private void setModeAndGravity()
    {
        final int tabCount = getTabCount();
        final int screenWidth = UtilsDevice.getScreenWidth();
        final int minWidthNeedForMixedMode = getMinSpaceNeededForFixedMode(tabCount);

        if (minWidthNeedForMixedMode == 0)
        {
            return;
        }
        else if (minWidthNeedForMixedMode < screenWidth)
        {
            setTabMode(MODE_FIXED);
            setTabGravity(UtilsDevice.isBigTablet() ? GRAVITY_CENTER : GRAVITY_FILL) ;
        }
        else
        {
            setTabMode(TabLayout.MODE_SCROLLABLE);
        }

        setLayoutParams(new LinearLayout.LayoutParams
                (LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT));

        mGravityAndModeSeUpNeeded = false;
    }

    private int getMinSpaceNeededForFixedMode(final int tabCount)
    {
        final LinearLayout linearLayout = (LinearLayout) getChildAt(0);
        int widestTab = 0;
        int currentWidth;

        for (int i = 0; i < tabCount; i++)
        {
            currentWidth = linearLayout.getChildAt(i).getWidth();

            if (currentWidth == 0) return 0;

            if (currentWidth > widestTab)
            {
                widestTab = currentWidth;
            }
        }

        return widestTab * tabCount;
    }

}

And this is the DeviceUtils class:

import android.content.res.Resources;

public class UtilsDevice extends Utils
{
    private static final int sWIDTH_FOR_BIG_TABLET_IN_DP = 720;

    private UtilsDevice() {}

    public static int pixelToDp(final int pixels)
    {
        return (int) (pixels / Resources.getSystem().getDisplayMetrics().density);
    }

    public static int getScreenWidth()
    {
        return Resources
                .getSystem()
                .getDisplayMetrics()
                .widthPixels;
    }

    public static boolean isBigTablet()
    {
        return pixelToDp(getScreenWidth()) >= sWIDTH_FOR_BIG_TABLET_IN_DP;
    }

}

Use example:

<?xml version="1.0" encoding="utf-8"?>

<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.com.stackoverflow.example.AdaptiveTabLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="?colorPrimary"
        app:tabIndicatorColor="@color/white"
        app:tabSelectedTextColor="@color/text_white_primary"
        app:tabTextColor="@color/text_white_secondary"
        tools:layout_width="match_parent"/>

</FrameLayout>

Gist

Problems/Ask for help:

  • You'll see this:

Logcat:

W/View: requestLayout() improperly called by android.support.design.widget.TabLayout$SlidingTabStrip{3e1ebcd6 V.ED.... ......ID 0,0-466,96} during layout: running second layout pass
W/View: requestLayout() improperly called by android.support.design.widget.TabLayout$TabView{3423cb57 VFE...C. ..S...ID 0,0-144,96} during layout: running second layout pass
W/View: requestLayout() improperly called by android.support.design.widget.TabLayout$TabView{377c4644 VFE...C. ......ID 144,0-322,96} during layout: running second layout pass
W/View: requestLayout() improperly called by android.support.design.widget.TabLayout$TabView{19ead32d VFE...C. ......ID 322,0-466,96} during layout: running second layout pass

I'm not sure how to solve it. Any suggestions?

  • To make the TabLayout child measures, I'm making some castings and assumptions (Like the child is a LinearLayout containing other views....) This might cause problems with in further Design Support Library updates. A better approach/suggestions?

Docker and securing passwords

The 12-Factor app methodology tells, that any configuration should be stored in environment variables.

Docker compose could do variable substitution in configuration, so that could be used to pass passwords from host to docker.

Delete terminal history in Linux

If you use bash, then the terminal history is saved in a file called .bash_history. Delete it, and history will be gone.

However, for MySQL the better approach is not to enter the password in the command line. If you just specify the -p option, without a value, then you will be prompted for the password and it won't be logged.

Another option, if you don't want to enter your password every time, is to store it in a my.cnf file. Create a file named ~/.my.cnf with something like:

[client]
user = <username>
password = <password>

Make sure to change the file permissions so that only you can read the file.

Of course, this way your password is still saved in a plaintext file in your home directory, just like it was previously saved in .bash_history.

How to create an Explorer-like folder browser control?

It's not as easy as it seems to implement a control like that. Explorer works with shell items, not filesystem items (ex: the control panel, the printers folder, and so on). If you need to implement it i suggest to have a look at the Windows shell functions at http://msdn.microsoft.com/en-us/library/bb776426(VS.85).aspx.

Performance of Arrays vs. Lists

Here's one that uses Dictionaries, IEnumerable:

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;

static class Program
{
    static void Main()
    {
        List<int> list = new List<int>(6000000);

        for (int i = 0; i < 6000000; i++)
        {
                list.Add(i);
        }
        Console.WriteLine("Count: {0}", list.Count);

        int[] arr = list.ToArray();
        IEnumerable<int> Ienumerable = list.ToArray();
        Dictionary<int, bool> dict = list.ToDictionary(x => x, y => true);

        int chk = 0;
        Stopwatch watch = Stopwatch.StartNew();
        for (int rpt = 0; rpt < 100; rpt++)
        {
            int len = list.Count;
            for (int i = 0; i < len; i++)
            {
                chk += list[i];
            }
        }
        watch.Stop();
        Console.WriteLine("List/for: {0}ms ({1})", watch.ElapsedMilliseconds, chk);

        chk = 0;
        watch = Stopwatch.StartNew();
        for (int rpt = 0; rpt < 100; rpt++)
        {
            for (int i = 0; i < arr.Length; i++)
            {
                chk += arr[i];
            }
        }
        watch.Stop();
        Console.WriteLine("Array/for: {0}ms ({1})", watch.ElapsedMilliseconds, chk);

        chk = 0;
        watch = Stopwatch.StartNew();
        for (int rpt = 0; rpt < 100; rpt++)
        {
            foreach (int i in Ienumerable)
            {
                chk += i;
            }
        }

        Console.WriteLine("Ienumerable/for: {0}ms ({1})", watch.ElapsedMilliseconds, chk);

        chk = 0;
        watch = Stopwatch.StartNew();
        for (int rpt = 0; rpt < 100; rpt++)
        {
            foreach (int i in dict.Keys)
            {
                chk += i;
            }
        }

        Console.WriteLine("Dict/for: {0}ms ({1})", watch.ElapsedMilliseconds, chk);


        chk = 0;
        watch = Stopwatch.StartNew();
        for (int rpt = 0; rpt < 100; rpt++)
        {
            foreach (int i in list)
            {
                chk += i;
            }
        }

        watch.Stop();
        Console.WriteLine("List/foreach: {0}ms ({1})", watch.ElapsedMilliseconds, chk);

        chk = 0;
        watch = Stopwatch.StartNew();
        for (int rpt = 0; rpt < 100; rpt++)
        {
            foreach (int i in arr)
            {
                chk += i;
            }
        }
        watch.Stop();
        Console.WriteLine("Array/foreach: {0}ms ({1})", watch.ElapsedMilliseconds, chk);



        chk = 0;
        watch = Stopwatch.StartNew();
        for (int rpt = 0; rpt < 100; rpt++)
        {
            foreach (int i in Ienumerable)
            {
                chk += i;
            }
        }
        watch.Stop();
        Console.WriteLine("Ienumerable/foreach: {0}ms ({1})", watch.ElapsedMilliseconds, chk);

        chk = 0;
        watch = Stopwatch.StartNew();
        for (int rpt = 0; rpt < 100; rpt++)
        {
            foreach (int i in dict.Keys)
            {
                chk += i;
            }
        }
        watch.Stop();
        Console.WriteLine("Dict/foreach: {0}ms ({1})", watch.ElapsedMilliseconds, chk);

        Console.ReadLine();
    }
}

Editing hosts file to redirect url?

You could use the RedirectMatch directive in Apache to do something similar you want.

It's pretty simple.

RedirectMatch / http://222.222.222.222/

Anyway, I can't see any reason to do that thing. Aren't you trying to intercept traffic? There are better ways. For Linux boxes as a router: iptables -j REDIRECT + Squid or Apache. For Cisco routers, you can use WCCP to a Cache or Web Server...

How do I get the value of a textbox using jQuery?

Use the .val() method to get the actual value of the element you need.

How to check a not-defined variable in JavaScript

I use a small function to verify a variable has been declared, which really cuts down on the amount of clutter in my javascript files. I add a check for the value to make sure that the variable not only exists, but has also been assigned a value. The second condition checks whether the variable has also been instantiated, because if the variable has been defined but not instantiated (see example below), it will still throw an error if you try to reference it's value in your code.

Not instantiated - var my_variable; Instantiated - var my_variable = "";

function varExists(el) { 
  if ( typeof el !== "undefined" && typeof el.val() !== "undefined" ) { 
    return true; 
  } else { 
    return false; 
  } 
}

You can then use a conditional statement to test that the variable has been both defined AND instantiated like this...

if ( varExists(variable_name) ) { // checks that it DOES exist } 

or to test that it hasn't been defined and instantiated use...

if( !varExists(variable_name) ) { // checks that it DOESN'T exist }

find_spec_for_exe': can't find gem bundler (>= 0.a) (Gem::GemNotFoundException)

gem update --system

will update the rubygems and will fix the problem.

How do I extract text that lies between parentheses (round brackets)?

A regex maybe? I think this would work...

\(([a-z]+?)\)

Getting only hour/minute of datetime

Try this:

var src = DateTime.Now;
var hm = new DateTime(src.Year, src.Month, src.Day, src.Hour, src.Minute, 0);

ReactJS call parent method

Using Function || stateless component

Parent Component

 import React from "react";
 import ChildComponent from "./childComponent";

 export default function Parent(){

 const handleParentFun = (value) =>{
   console.log("Call to Parent Component!",value);
 }
 return (<>
           This is Parent Component
           <ChildComponent 
             handleParentFun={(value)=>{
               console.log("your value -->",value);
               handleParentFun(value);
             }}
           />
        </>);
}

Child Component

import React from "react";


export default function ChildComponent(props){
  return(
         <> This is Child Component 
          <button onClick={props.handleParentFun("YoureValue")}>
            Call to Parent Component Function
          </button>
         </>
        );
}

How do you do a deep copy of an object in .NET?

Maybe you only need a shallow copy, in that case use Object.MemberWiseClone().

There are good recommendations in the documentation for MemberWiseClone() for strategies to deep copy: -

http://msdn.microsoft.com/en-us/library/system.object.memberwiseclone.aspx

100% width Twitter Bootstrap 3 template

This is the complete basic structure for 100% width layout in Bootstrap v3.0.0. You shouldn't wrap your <div class="row"> with container class. Cause container class will take lots of margin and this will not provide you full screen (100% width) layout where bootstrap has removed container-fluid class from their mobile-first version v3.0.0.

So just start writing <div class="row"> without container class and you are ready to go with 100% width layout.

<!DOCTYPE html>
<html>
  <head>
    <title>Bootstrap Basic 100% width Structure</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- Bootstrap -->
    <link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">

<!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries -->
<!--[if lt IE 9]>
  <script src="http://getbootstrap.com/assets/js/html5shiv.js"></script>
  <script src="http://getbootstrap.com/assets/js/respond.min.js"></script>
<![endif]-->
<style>
    .red{
        background-color: red;
    }
    .green{
        background-color: green;
    }
</style>
</head>
<body>
    <div class="row">
        <div class="col-md-3 red">Test content</div>
        <div class="col-md-9 green">Another Content</div>
    </div>
    <!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
    <script src="//code.jquery.com/jquery.js"></script>
    <!-- Include all compiled plugins (below), or include individual files as needed -->
    <script src="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
</body>
</html>

To see the result by yourself I have created a bootply. See the live output there. http://bootply.com/82136 And the complete basic bootstrap 3 100% width layout I have created a gist. you can use that. Get the gist from here

Reply me if you need more further assistance. Thanks.

PHP XML how to output nice format

Tried all the answers but none worked. Maybe it's because I'm appending and removing childs before saving the XML. After a lot of googling found this comment in the php documentation. I only had to reload the resulting XML to make it work.

$outXML = $xml->saveXML(); 
$xml = new DOMDocument(); 
$xml->preserveWhiteSpace = false; 
$xml->formatOutput = true; 
$xml->loadXML($outXML); 
$outXML = $xml->saveXML(); 

window.close() doesn't work - Scripts may close only the windows that were opened by it

You can't close a current window or any window or page that is opened using '_self' But you can do this

var customWindow = window.open('', '_blank', '');
    customWindow.close();

Convert date time string to epoch in Bash

A lot of these answers overly complicated and also missing how to use variables. This is how you would do it more simply on standard Linux system (as previously mentioned the date command would have to be adjusted for Mac Users) :

Sample script:

#!/bin/bash
orig="Apr 28 07:50:01"
epoch=$(date -d "${orig}" +"%s")
epoch_to_date=$(date -d @$epoch +%Y%m%d_%H%M%S)    

echo "RESULTS:"
echo "original = $orig"
echo "epoch conv = $epoch"
echo "epoch to human readable time stamp = $epoch_to_date"

Results in :

RESULTS:
original = Apr 28 07:50:01
epoch conv = 1524916201 
epoch to human readable time stamp = 20180428_075001

Or as a function :

# -- Converts from human to epoch or epoch to human, specifically "Apr 28 07:50:01" human.
#    typeset now=$(date +"%s")
#    typeset now_human_date=$(convert_cron_time "human" "$now")

function convert_cron_time() {
    case "${1,,}" in
        epoch)
            # human to epoch (eg. "Apr 28 07:50:01" to 1524916201)
            echo $(date -d "${2}" +"%s")
            ;;
        human)
            # epoch to human (eg. 1524916201 to "Apr 28 07:50:01")
            echo $(date -d "@${2}" +"%b %d %H:%M:%S")
            ;;
    esac
}

Replace last occurrence of a string in a string

Shorthand for accepted answer

function str_lreplace($search, $replace, $subject){ 
    return is_numeric($pos=strrpos($subject,$search))?
    substr_replace($subject,$replace,$pos,strlen($search)):$subject;
}

Postgresql: password authentication failed for user "postgres"

If you are trying to login postgres shell as postgres user, then you can use following commands.

switch to postgres user

# su - postgres

login to psql

# psql

Hope that helps

Random number from a range in a Bash Script

Here's another one. I thought it would work on just about anything, but sort's random option isn't available on my centos box at work.

 seq 2000 65000 | sort -R | head -n 1

Understanding INADDR_ANY for socket programming

INADDR_ANY instructs listening socket to bind to all available interfaces. It's the same as trying to bind to inet_addr("0.0.0.0"). For completeness I'll also mention that there is also IN6ADDR_ANY_INIT for IPv6 and it's the same as trying to bind to :: address for IPv6 socket.

#include <netinet/in.h>

struct in6_addr addr = IN6ADDR_ANY_INIT;

Also, note that when you bind IPv6 socket to to IN6ADDR_ANY_INIT your socket will bind to all IPv6 interfaces, and should be able to accept connections from IPv4 clients as well (though IPv6-mapped addresses).

Why is Tkinter Entry's get function returning nothing?

It looks like you may be confused as to when commands are run. In your example, you are calling the get method before the GUI has a chance to be displayed on the screen (which happens after you call mainloop.

Try adding a button that calls the get method. This is much easier if you write your application as a class. For example:

import tkinter as tk

class SampleApp(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self.entry = tk.Entry(self)
        self.button = tk.Button(self, text="Get", command=self.on_button)
        self.button.pack()
        self.entry.pack()

    def on_button(self):
        print(self.entry.get())

app = SampleApp()
app.mainloop()

Run the program, type into the entry widget, then click on the button.

find all subsets that sum to a particular value

Python function subset that return subset of list that adds up to a particular value

def subset(ln, tar):#ln=Lenght Of String, tar= Target
s=[ int(input('Insert Numeric Value Into List:')) for i in range(ln) ]#Inserting int Values in s of type<list>
if sum(s) < tar:#Sum of List is less than Target Value
    return
elif sum(s) == tar:#Sum of list is equal to Target Value i.e for all values combinations
    return s
elif tar in s:#Target value present in List i.e for single value
    return s[s.index(tar)]
else:#For remaining possibilities i.e for all except( single and all values combinations )
    from itertools import combinations# To check all combinations ==> itertools.combinations(list,r) OR return list of all subsets of length r
    r=[i+1 for i in range(1,ln-1)]# Taking r as only remaining value combinations, i.e. 
                                 # Except(  r=1 => for single value combinations AND r=length(list) || r=ln => For all value combinations
    lst=list()#For Storing all remaining combinations
    for i in range(len(r)):
        lst.extend(list( combinations(s,r[i]) ))
    for i in range(len(lst)):# To check remaining possibilities
        if tar == sum(lst[i]):
            return list(lst[i])

subset( int(input('Length of list:')), int(input('Target:')))

Best practice for using assert?

Asserts should be used to test conditions that should never happen. The purpose is to crash early in the case of a corrupt program state.

Exceptions should be used for errors that can conceivably happen, and you should almost always create your own Exception classes.


For example, if you're writing a function to read from a configuration file into a dict, improper formatting in the file should raise a ConfigurationSyntaxError, while you can assert that you're not about to return None.


In your example, if x is a value set via a user interface or from an external source, an exception is best.

If x is only set by your own code in the same program, go with an assertion.

Google Colab: how to read data from my google drive?

To read all files in a folder:

import glob
from google.colab import drive
drive.mount('/gdrive', force_remount=True)

#!ls "/gdrive/My Drive/folder"

files = glob.glob(f"/gdrive/My Drive/folder/*.txt")
for file in files:  
  do_something(file)

Pass a JavaScript function as parameter

You just need to remove the parenthesis:

addContact(entityId, refreshContactList);

This then passes the function without executing it first.

Here is an example:

function addContact(id, refreshCallback) {
    refreshCallback();
    // You can also pass arguments if you need to
    // refreshCallback(id);
}

function refreshContactList() {
    alert('Hello World');
}

addContact(1, refreshContactList);

How to scroll to top of page with JavaScript/jQuery?

First add a blank anchor tag to the place where you want to go

<a href="#topAnchor"></a> 

Now add a function in header section

 function GoToTop() {
            var urllocation = location.href;
            if (urllocation.indexOf("#topAnchor") > -1) {
                window.location.hash = "topAnchor";
            } else {
                return false;
            }
        }

finally add an onload event to the body tag

<body onload="GoToTop()">

How to emit an event from parent to child?

In a parent component you can use @ViewChild() to access child component's method/variable.

@Component({
  selector: 'app-number-parent',
  templateUrl: './number-parent.component.html'
})
export class NumberParentComponent {
    @ViewChild(NumberComponent)
    private numberComponent: NumberComponent;
    increase() {
       this.numberComponent.increaseByOne();
    }
    decrease() {
       this.numberComponent.decreaseByOne();
    }
} 

Update:

Angular 8 onwards -

@ViewChild(NumberComponent, { static: false })

Why does Maven have such a bad rep?

It's more complicated than the language you used to write your project. Getting it configured right is harder than actual programming.

Prevent flex items from stretching

You don't want to stretch the span in height?
You have the possiblity to affect one or more flex-items to don't stretch the full height of the container.

To affect all flex-items of the container, choose this:
You have to set align-items: flex-start; to div and all flex-items of this container get the height of their content.

_x000D_
_x000D_
div {_x000D_
  align-items: flex-start;_x000D_
  background: tan;_x000D_
  display: flex;_x000D_
  height: 200px;_x000D_
}_x000D_
span {_x000D_
  background: red;_x000D_
}
_x000D_
<div>_x000D_
  <span>This is some text.</span>_x000D_
</div>
_x000D_
_x000D_
_x000D_

To affect only a single flex-item, choose this:
If you want to unstretch a single flex-item on the container, you have to set align-self: flex-start; to this flex-item. All other flex-items of the container aren't affected.

_x000D_
_x000D_
div {_x000D_
  display: flex;_x000D_
  height: 200px;_x000D_
  background: tan;_x000D_
}_x000D_
span.only {_x000D_
  background: red;_x000D_
  align-self:flex-start;_x000D_
}_x000D_
span {_x000D_
    background:green;_x000D_
}
_x000D_
<div>_x000D_
  <span class="only">This is some text.</span>_x000D_
  <span>This is more text.</span>_x000D_
</div>
_x000D_
_x000D_
_x000D_

Why is this happening to the span?
The default value of the property align-items is stretch. This is the reason why the span fill the height of the div.

Difference between baseline and flex-start?
If you have some text on the flex-items, with different font-sizes, you can use the baseline of the first line to place the flex-item vertically. A flex-item with a smaller font-size have some space between the container and itself at top. With flex-start the flex-item will be set to the top of the container (without space).

_x000D_
_x000D_
div {_x000D_
  align-items: baseline;_x000D_
  background: tan;_x000D_
  display: flex;_x000D_
  height: 200px;_x000D_
}_x000D_
span {_x000D_
  background: red;_x000D_
}_x000D_
span.fontsize {_x000D_
  font-size:2em;_x000D_
}
_x000D_
<div>_x000D_
  <span class="fontsize">This is some text.</span>_x000D_
  <span>This is more text.</span>_x000D_
</div>
_x000D_
_x000D_
_x000D_

You can find more information about the difference between baseline and flex-start here:
What's the difference between flex-start and baseline?

Center a button in a Linear layout

Have you tried defining android:gravity="center_vertical|center_horizontal" inside the layout and setting android:layout_weight="1" in the image?

SQL Server add auto increment primary key to existing table

If your table has relationship with other tables using its primary or foriegen key, may be it is impossible to alter your table. so you need to drop and create the table again.
To solve these problems you need to Generate Scripts by right click on the database and in advanced option set type of data to script to scheme and data. after that, using this script with the changing your column to identify and regenerate the table using run its query.
your query will be like here:

USE [Db_YourDbName]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
Drop TABLE [dbo].[Tbl_TourTable]

CREATE TABLE [dbo].[Tbl_TourTable](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [Name] [nvarchar](50) NULL,
    [Family] [nvarchar](150) NULL)  

GO

SET IDENTITY_INSERT [dbo].[Tbl_TourTable] ON 

INSERT [dbo].[Tbl_TourTable] ([ID], [Name], [Family]) VALUES (1,'name 1', 'family 1')
INSERT [dbo].[Tbl_TourTable] ([ID], [Name], [Family]) VALUES (1,'name 1', 'family 1')
INSERT [dbo].[Tbl_TourTable] ([ID], [Name], [Family]) VALUES (1,'name 1', 'family 1')
INSERT [dbo].[Tbl_TourTable] ([ID], [Name], [Family]) VALUES (1,'name 1', 'family 1')
INSERT [dbo].[Tbl_TourTable] ([ID], [Name], [Family]) VALUES (1,'name 1', 'family 1')
INSERT [dbo].[Tbl_TourTable] ([ID], [Name], [Family]) VALUES (1,'name 1', 'family 1')
INSERT [dbo].[Tbl_TourTable] ([ID], [Name], [Family]) VALUES (1,'name 1', 'family 1')

SET IDENTITY_INSERT [dbo].[Tbl_TourTable] off 

Replace words in a string - Ruby

sentence.sub! 'Robert', 'Joe'

Won't cause an exception if the replaced word isn't in the sentence (the []= variant will).

How to replace all instances?

The above replaces only the first instance of "Robert".

To replace all instances use gsub/gsub! (ie. "global substitution"):

sentence.gsub! 'Robert', 'Joe'

The above will replace all instances of Robert with Joe.

What is the best way to get the count/length/size of an iterator?

You will always have to iterate. Yet you can use Java 8, 9 to do the counting without looping explicitely:

Iterable<Integer> newIterable = () -> iter;
long count = StreamSupport.stream(newIterable.spliterator(), false).count();

Here is a test:

public static void main(String[] args) throws IOException {
    Iterator<Integer> iter = Arrays.asList(1, 2, 3, 4, 5).iterator();
    Iterable<Integer> newIterable = () -> iter;
    long count = StreamSupport.stream(newIterable.spliterator(), false).count();
    System.out.println(count);
}

This prints:

5

Interesting enough you can parallelize the count operation here by changing the parallel flag on this call:

long count = StreamSupport.stream(newIterable.spliterator(), *true*).count();

Count number of tables in Oracle

THIS QUERY WILL FIND ALL THE OBJECTS COUNTS IN A SPECIFIC SCHEMA

select owner, object_type, count(*) from dba_objects where owner='owner_name' group by owner, object_type order by 3 desc;

How to use putExtra() and getExtra() for string data

Intent intent = new Intent(view.getContext(), ApplicationActivity.class);
                        intent.putExtra("int", intValue);
                        intent.putExtra("Serializable", object);
                        intent.putExtra("String", stringValue);
                        intent.putExtra("parcelable", parObject);
                        startActivity(intent);

ApplicationActivity

Intent intent = getIntent();
Bundle bundle = intent.getExtras();

if(bundle != null){
   int mealId = bundle.getInt("int");
   Object object = bundle.getSerializable("Serializable");
   String string = bundle.getString("String");
   T string = <T>bundle.getString("parcelable");
}

How to make the checkbox unchecked by default always

Well I guess you can use checked="false". That is the html way to leave a checkbox unchecked. You can refer to http://www.w3schools.com/jsref/dom_obj_checkbox.asp.

Initializing a dictionary in python with a key value and no corresponding values

You can initialize the values as empty strings and fill them in later as they are found.

dictionary = {'one':'','two':''}
dictionary['one']=1
dictionary['two']=2

mysql_config not found when installing mysqldb python interface

In CentOS 7 , the following things should be done:

#step1:install mysql 
https://dev.mysql.com/doc/mysql-yum-repo-quick-guide/en/

#step2:
sudo yum install mysql-devel

or

sudo yum install mysql-community-devel

What are the differences between LDAP and Active Directory?

Active Directory is a database based system that provides authentication, directory, policy, and other services in a Windows environment

LDAP (Lightweight Directory Access Protocol) is an application protocol for querying and modifying items in directory service providers like Active Directory, which supports a form of LDAP.

Short answer: AD is a directory services database, and LDAP is one of the protocols you can use to talk to it.

Pass Array Parameter in SqlCommand

I wanted to expand on the answer that Brian contributed to make this easily usable in other places.

/// <summary>
/// This will add an array of parameters to a SqlCommand. This is used for an IN statement.
/// Use the returned value for the IN part of your SQL call. (i.e. SELECT * FROM table WHERE field IN (returnValue))
/// </summary>
/// <param name="sqlCommand">The SqlCommand object to add parameters to.</param>
/// <param name="array">The array of strings that need to be added as parameters.</param>
/// <param name="paramName">What the parameter should be named.</param>
protected string AddArrayParameters(SqlCommand sqlCommand, string[] array, string paramName)
{
    /* An array cannot be simply added as a parameter to a SqlCommand so we need to loop through things and add it manually. 
     * Each item in the array will end up being it's own SqlParameter so the return value for this must be used as part of the
     * IN statement in the CommandText.
     */
    var parameters = new string[array.Length];
    for (int i = 0; i < array.Length; i++)
    {
        parameters[i] = string.Format("@{0}{1}", paramName, i);
        sqlCommand.Parameters.AddWithValue(parameters[i], array[i]);
    }

    return string.Join(", ", parameters);
}

You can use this new function as follows:

SqlCommand cmd = new SqlCommand();

string ageParameters = AddArrayParameters(cmd, agesArray, "Age");
sql = string.Format("SELECT * FROM TableA WHERE Age IN ({0})", ageParameters);

cmd.CommandText = sql;


Edit: Here is a generic variation that works with an array of values of any type and is usable as an extension method:

public static class Extensions
{
    public static void AddArrayParameters<T>(this SqlCommand cmd, string name, IEnumerable<T> values) 
    { 
        name = name.StartsWith("@") ? name : "@" + name;
        var names = string.Join(", ", values.Select((value, i) => { 
            var paramName = name + i; 
            cmd.Parameters.AddWithValue(paramName, value); 
            return paramName; 
        })); 
        cmd.CommandText = cmd.CommandText.Replace(name, names); 
    }
}

You can then use this extension method as follows:

var ageList = new List<int> { 1, 3, 5, 7, 9, 11 };
var cmd = new SqlCommand();
cmd.CommandText = "SELECT * FROM MyTable WHERE Age IN (@Age)";    
cmd.AddArrayParameters("Age", ageList);

Make sure you set the CommandText before calling AddArrayParameters.

Also make sure your parameter name won't partially match anything else in your statement (i.e. @AgeOfChild)

How to check if cursor exists (open status)

You can use the CURSOR_STATUS function to determine its state.

IF CURSOR_STATUS('global','myCursor')>=-1
BEGIN
 DEALLOCATE myCursor
END

Change Timezone in Lumen or Laravel 5

Go to config -> app.php and change 'timezone' => 'Asia/Jakarta',

(this is my timezone)

Using colors with printf

#include <stdio.h>

//fonts color
#define FBLACK      "\033[30;"
#define FRED        "\033[31;"
#define FGREEN      "\033[32;"
#define FYELLOW     "\033[33;"
#define FBLUE       "\033[34;"
#define FPURPLE     "\033[35;"
#define D_FGREEN    "\033[6;"
#define FWHITE      "\033[7;"
#define FCYAN       "\x1b[36m"

//background color
#define BBLACK      "40m"
#define BRED        "41m"
#define BGREEN      "42m"
#define BYELLOW     "43m"
#define BBLUE       "44m"
#define BPURPLE     "45m"
#define D_BGREEN    "46m"
#define BWHITE      "47m"

//end color
#define NONE        "\033[0m"

int main(int argc, char *argv[])
{
    printf(D_FGREEN BBLUE"Change color!\n"NONE);

    return 0;
}

What does the error "arguments imply differing number of rows: x, y" mean?

Though this isn't a DIRECT answer to your question, I just encountered a similar problem, and thought I'd mentioned it:

I had an instance where it was instantiating a new (no doubt very inefficent) record for data.frame (a result of recursive searching) and it was giving me the same error.

I had this:

return(
  data.frame(
    user_id = gift$email,
    sourced_from_agent_id = gift$source,
    method_used = method,
    given_to = gift$account,
    recurring_subscription_id = NULL,
    notes = notes,
    stringsAsFactors = FALSE
  )
)

turns out... it was the = NULL. When I switched to = NA, it worked fine. Just in case anyone else with a similar problem hits THIS post as I did.

Viewing localhost website from mobile device

First of all open applicationhost.config file in visual studio. address>>C:\Users\Your User Name\Documents\IISExpress\config\applicationhost.config

Then find this codes:

<site name="Your Site_Name" id="24">
        <application path="/" applicationPool="Clr4IntegratedAppPool"
        <virtualDirectory path="/" physicalPath="C:\Users\Your User         Name\Documents\Visual Studio 2013\Projects\Your Site Name" />
        </application>
         <bindings>      
           <binding protocol="http" bindingInformation="*:Port_Number:*" />
         </bindings>
   </site>

*)Port_Number:While your site running in IIS express on your computer, port number will visible in address bar of your browser like this: localhost:port_number/... When edit this file save it.

In the Second step you must run cmd as administrator and type this code: netsh http add urlacl url=http://*:port_Number/ user=everyone and press enter

In Third step you must Enable port on firewall

Go to the “Control Panel\System and Security\Windows Firewall”

Click “Advanced settings”

Select “Inbound Rules”

Click on “New Rule …” button

Select “Port”, click “Next”

Fill your IIS Express listening port number, click “Next”

Select “Allow the connection”, click “Next”

Check where you would like allow connection to IIS Express (Domain,Private, Public), click “Next”

Fill rule name (e.g “IIS Express), click “Finish”

I hopeful this answer be useful for you

Update for Visual Studio 2015 in this link: https://johan.driessen.se/posts/Accessing-an-IIS-Express-site-from-a-remote-computer

How to extract text from a PDF?

Docotic.Pdf library may be used to extract text from PDF files as plain text or as a collection of text chunks with coordinates for each chunk.

Docotic.Pdf can be used to extract images from PDFs, too.

Disclaimer: I work for Bit Miracle.

mysql select from n last rows

I know this may be a bit old, but try using PDO::lastInsertId. I think it does what you want it to, but you would have to rewrite your application to use PDO (Which is a lot safer against attacks)

Inserting code in this LaTeX document with indentation

Here is how to add inline code:

You can add inline code with {\tt code } or \texttt{ code }. If you want to format the inline code, then it would be best to make your own command

\newcommand{\code}[1]{\texttt{#1}}

Also, note that code blocks can be loaded from other files with

\lstinputlisting[breaklines]{source.c}

breaklines isn't required, but I find it useful. Be aware that you'll have to specify \usepackage{ listings } for this one.

Update: The listings package also includes the \lstinline command, which has the same syntax highlighting features as the \lstlisting and \lstinputlisting commands (see Cloudanger's answer for configuration details). As mentioned in a few other answers, there's also the minted package, which provides the \mintinline command. Like \lstinline, \mintinline provides the same syntax highlighting as a regular minted code block:

\documentclass{article}

\usepackage{minted}

\begin{document}
  This is a sentence with \mintinline{python}{def inlineCode(a="ipsum)}
\end{document}

Twig for loop for arrays with keys

I found the answer :

{% for key,value in array_path %}
    Key : {{ key }}
    Value : {{ value }}
{% endfor %}

Integer to IP Address - C

Hint: break up the 32-bit integer to 4 8-bit integers, and print them out.

Something along the lines of this (not compiled, YMMV):

int i = 0xDEADBEEF; // some 32-bit integer
printf("%i.%i.%i.%i",
          (i >> 24) & 0xFF,
          (i >> 16) & 0xFF,
          (i >> 8) & 0xFF,
          i & 0xFF);

Calculating the difference between two Java date instances

Subtracting the dates in milliseconds works (as described in another post), but you have to use HOUR_OF_DAY and not HOUR when clearing the time parts of your dates:

public static final long MSPERDAY = 60 * 60 * 24 * 1000;
...
final Calendar dateStartCal = Calendar.getInstance();
dateStartCal.setTime(dateStart);
dateStartCal.set(Calendar.HOUR_OF_DAY, 0); // Crucial.
dateStartCal.set(Calendar.MINUTE, 0);
dateStartCal.set(Calendar.SECOND, 0);
dateStartCal.set(Calendar.MILLISECOND, 0);
final Calendar dateEndCal = Calendar.getInstance();
dateEndCal.setTime(dateEnd);
dateEndCal.set(Calendar.HOUR_OF_DAY, 0); // Crucial.
dateEndCal.set(Calendar.MINUTE, 0);
dateEndCal.set(Calendar.SECOND, 0);
dateEndCal.set(Calendar.MILLISECOND, 0);
final long dateDifferenceInDays = ( dateStartCal.getTimeInMillis()
                                  - dateEndCal.getTimeInMillis()
                                  ) / MSPERDAY;
if (dateDifferenceInDays > 15) {
    // Do something if difference > 15 days
}

Uninstall Eclipse under OSX?

No need to uninstall anything, you can just delete the eclipse/ folder, but you should also use a fresh workspace or delete the workspace/.metadata folder.

javascript: optional first argument in function

Call like this

my_function ("", options);

Prevent row names to be written to file when using write.csv

For completeness, write_csv() from the readr package is faster and never writes row names

# install.packages('readr', dependencies = TRUE)
library(readr)
write_csv(t, "t.csv")

If you need to write big data out, use fwrite() from the data.table package. It's much faster than both write.csv and write_csv

# install.packages('data.table')
library(data.table)
fwrite(t, "t.csv")

Below is a benchmark that Edouard published on his site

microbenchmark(write.csv(data, "baseR_file.csv", row.names = F),
               write_csv(data, "readr_file.csv"),
               fwrite(data, "datatable_file.csv"),
               times = 10, unit = "s")

## Unit: seconds
##                                              expr        min         lq       mean     median         uq        max neval
##  write.csv(data, "baseR_file.csv", row.names = F) 13.8066424 13.8248250 13.9118324 13.8776993 13.9269675 14.3241311    10
##                 write_csv(data, "readr_file.csv")  3.6742610  3.7999409  3.8572456  3.8690681  3.8991995  4.0637453    10
##                fwrite(data, "datatable_file.csv")  0.3976728  0.4014872  0.4097876  0.4061506  0.4159007  0.4355469    10

How to get a vCard (.vcf file) into Android contacts from website

Just to let you know: I just tried it using a vCard 2.1 file created according to the vCard 2.1 spec. I found that vCard 2.1, despite being an old version, already covered everything I needed, including a base64-encoded photo and international character sets.

It worked perfectly on my unmodified Android 4.1.1 device (Galaxy S3). It also worked on an old iPhone 3GS (iOS 5, via the Evernote app) and a coworker's unmodified old Android 2.1 device. You only need to set the Content-disposition to attachment as suggested above.

A minor problem was that I triggered the VCF download using a QR code, which I scanned with the Microsoft Tag app. That app told me Android couldn't handle the text/x-vcard media type (or just text/vcard, no matter). Once I opened the link in a Web browser (I tried Chrome and the Android default browser), it worked fine.

Could not find com.google.android.gms:play-services:3.1.59 3.2.25 4.0.30 4.1.32 4.2.40 4.2.42 4.3.23 4.4.52 5.0.77 5.0.89 5.2.08 6.1.11 6.1.71 6.5.87

In addition to installing the repository and the SDK packages one should be aware that the version number changes periodically. A simple solution at this point is to replace the specific version number with a plus (+) symbol.

compile 'com.google.android.gms:play-services:+'

Google instructions indicate that one should be sure to upgrade the version numbers, however adding the plus deals with the changes in versioning. Also note that when building in Android Studio a message will appear in the status line when a new version is available.

One can view the available versions of play services by drilling down on the correct repository path:

play-services repository path

References

This site also has instructions for Eclipse, and other IDE's.

ADS-Setup

origin 'http://localhost:4200' has been blocked by CORS policy in Angular7

For nodejs use the below code

res.setHeader('Access-Control-Allow-Origin', 'http://localhost:4200');

Setting the filter to an OpenFileDialog to allow the typical image formats?

In order to match a list of different categories of file, you can use the filter like this:

        var dlg = new Microsoft.Win32.OpenFileDialog()
        {
            DefaultExt = ".xlsx",
            Filter = "Excel Files (*.xls, *.xlsx)|*.xls;*.xlsx|CSV Files (*.csv)|*.csv"
        };

List<Map<String, String>> vs List<? extends Map<String, String>>

You cannot assign expressions with types such as List<NavigableMap<String,String>> to the first.

(If you want to know why you can't assign List<String> to List<Object> see a zillion other questions on SO.)

printing all contents of array in C#

Starting from C# 6.0, when $ - string interpolation has been introduced, there is one more way:

var array = new[] { "A", "B", "C" };
Console.WriteLine($"{string.Join(", ", array}");

//output
A, B, C

Concatenation could be archived using the System.Linq, convert the string[] to char[] and print as a string

var array = new[] { "A", "B", "C" };
Console.WriteLine($"{new String(array.SelectMany(_ => _).ToArray())}");

//output
ABC

When to use a View instead of a Table?

Views are handy when you need to select from several tables, or just to get a subset of a table.

You should design your tables in such a way that your database is well normalized (minimum duplication). This can make querying somewhat difficult.

Views are a bit of separation, allowing you to view the data in the tables differently than they are stored.

C# Iterate through Class properties

Yes, you could make an indexer on your Record class that maps from the property name to the correct property. This would keep all the binding from property name to property in one place eg:

public class Record
{
    public string ItemType { get; set; }

    public string this[string propertyName]
    {
        set
        {
            switch (propertyName)
            {
                case "itemType":
                    ItemType = value;
                    break;
                    // etc
            }   
        }
    }
}

Alternatively, as others have mentioned, use reflection.

C# List of objects, how do I get the sum of a property

Another alternative:

myPlanetsList.Select(i => i.Moons).Sum();

How can I check if a MySQL table exists with PHP?

It was already posted but here it is with PDO (same query)...

$connection = new PDO ( "mysql:host=host_db; dbname=name_db", user_db, pass_db );

if ($connection->query ("DESCRIBE table_name"  )) {
    echo "exist";
} else {
    echo "doesn't exist";
}

Works like a charm for me....

And here's another approach (i think it is slower)...

if ($connection->query ( "SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = 'db_name' AND table_name ='tbl_name'" )->fetch ()) {
    echo "exist";
} else {
    echo "doesn't exist";
}

You can also play with this query:

SHOW TABLE STATUS FROM db_name LIKE 'tbl_name'

I think this was suggested to use in the mysql page.

How to convert Varchar to Int in sql server 2008?

Spaces will not be a problem for cast, however characters like TAB, CR or LF will appear as spaces, will not be trimmed by LTRIM or RTRIM, and will be a problem.

For example try the following:

declare @v1 varchar(21) = '66',
        @v2 varchar(21) = '   66   ',
        @v3 varchar(21) = '66' + char(13) + char(10),
        @v4 varchar(21) = char(9) + '66'

select cast(@v1 as int)   -- ok
select cast(@v2 as int)   -- ok
select cast(@v3 as int)   -- error
select cast(@v4 as int)   -- error

Check your input for these characters and if you find them, use REPLACE to clean up your data.


Per your comment, you can use REPLACE as part of your cast:

select cast(replace(replace(@v3, char(13), ''), char(10), '') as int)

If this is something that will be happening often, it would be better to clean up the data and modify the way the table is populated to remove the CR and LF before it is entered.

Clearing input in vuejs form

Assuming that you have a form that is huge or simply you do not want to reset each form field one by one, you can reset all the fields of the form by iterating through the fields one by one

var self = this;
Object.keys(this.data.form).forEach(function(key,index) {
    self.data.form[key] = '';
});

The above will reset all fields of the given this.data.form object to empty string. Let's say there are one or two fields that you selectively want to set to a specific value in that case inside the above block you can easily put a condition based on field name

if(key === "country") 
   self.data.form[key] = 'Canada';
else 
   self.data.form[key] = ''; 

Or if you want to reset the field based on type and you have boolean and other field types in that case

if(typeof self.data.form[key] === "string") 
   self.data.form[key] = ''; 
else if (typeof self.data.form[key] === "boolean") 
   self.data.form[key] = false; 

For more type info see here

A basic vuejs template and script sample would look as follow

<template>
  <div>
    <form @submit.prevent="onSubmit">
      <input type="text" class="input" placeholder="User first name" v-model="data.form.firstName">
      <input type="text" class="input" placeholder="User last name" v-model="data.form.lastName">
      <input type="text" class="input" placeholder="User phone" v-model="data.form.phone">
      <input type="submit" class="button is-info" value="Add">
      <input type="button" class="button is-warning" @click="resetForm()" value="Reset Form">
    </form>
  </div>
</template>

See ow the @submit.prevent="onSubmit" is used in the form element. That would by default, prevent the form submission and call the onSubmit function.

Let's assume we have the following for the above

<script>
  export default {
    data() {
      return {
        data: {
          form: {
            firstName: '',
            lastName: '',
            phone: ''
          }
        }
      }
    },
    methods: {
      onSubmit: function() {
        console.log('Make API request.')
        this.resetForm(); //clear form automatically after successful request
      },
      resetForm() {
        console.log('Reseting the form')
        var self = this; //you need this because *this* will refer to Object.keys below`

        //Iterate through each object field, key is name of the object field`
        Object.keys(this.data.form).forEach(function(key,index) {
          self.data.form[key] = '';
        });
      }
    }
  }
</script>

You can call the resetForm from anywhere and it will reset your form fields.

How to set cookies in laravel 5 independently inside controller

If you want to set cookie and get it outside of request, Laravel is not your friend.

Laravel cookies are part of Request, so if you want to do this outside of Request object, use good 'ole PHP setcookie(..) and $_COOKIE to get it.

how to display a div triggered by onclick event

function showstuff(boxid){
   document.getElementById(boxid).style.visibility="visible";
}
<button onclick="showstuff('id_to_show');" />

This will help you, I think.

Error while sending QUERY packet

You can solve this problem by following few steps:

1) open your terminal window

2) please write following command in your terminal

ssh root@yourIP port

3) Enter root password

4) Now edit your server my.cnf file using below command

nano /etc/my.cnf  

if command is not recognized do this first or try vi then repeat: yum install nano.

OR

  vi /etc/my.cnf 

5) Add the line under the [MYSQLD] section. :

max_allowed_packet=524288000 (obviously adjust size for whatever you need) 
wait_timeout = 100

6) Control + O (save) then ENTER (confirm) then Control + X (exit file)

7) Then restart your mysql server by following command

/etc/init.d/mysql stop
/etc/init.d/mysql start

8) You can verify by going into PHPMyAdmin or opening a SQL command window and executing:

SHOW VARIABLES LIKE 'max_allowed_packet'

This works for me. I hope it should work for you.

Combine hover and click functions (jQuery)?

Use mouseover instead hover.

$('#target').on('click mouseover', function () {
    // Do something for both
});

Scala: join an iterable of strings

How about mkString ?

theStrings.mkString(",")

A variant exists in which you can specify a prefix and suffix too.

See here for an implementation using foldLeft, which is much more verbose, but perhaps worth looking at for education's sake.

The type WebMvcConfigurerAdapter is deprecated

I have been working on Swagger equivalent documentation library called Springfox nowadays and I found that in the Spring 5.0.8 (running at present), interface WebMvcConfigurer has been implemented by class WebMvcConfigurationSupport class which we can directly extend.

import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

public class WebConfig extends WebMvcConfigurationSupport { }

And this is how I have used it for setting my resource handling mechanism as follows -

@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
    registry.addResourceHandler("swagger-ui.html")
            .addResourceLocations("classpath:/META-INF/resources/");

    registry.addResourceHandler("/webjars/**")
            .addResourceLocations("classpath:/META-INF/resources/webjars/");
}

LINQ query to select top five

The solution:

var list = (from t in ctn.Items
           where t.DeliverySelection == true && t.Delivery.SentForDelivery == null
           orderby t.Delivery.SubmissionDate
           select t).Take(5);

How to get all privileges back to the root user in MySQL?

If you facing grant permission access denied problem, you can try mysql_upgrade to fix the problem:

/usr/bin/mysql_upgrade -u root -p

Login as root:

mysql -u root -p

Run this commands:

mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost';
mysql> FLUSH PRIVILEGES;

trigger click event from angularjs directive

This is more the Angular way to do it: http://plnkr.co/edit/xYNX47EsYvl4aRuGZmvo?p=preview

  1. I added $scope.selectedItem that gets you past your first problem (defaulting the image)
  2. I added $scope.setSelectedItem and called it in ng-click. Your final requirements may be different, but using a directive to bind click and change src was overkill, since most of it can be handled with template
  3. Notice use of ngSrc to avoid errant server calls on initial load
  4. You'll need to adjust some styles to get the image positioned right in the div. If you really need to use background-image, then you'll need a directive like ngSrc that defers setting the background-image style until after real data has loaded.

How to make URL/Phone-clickable UILabel?

Swift 4.2, Xcode 9.3 version

class LinkedLabel: UILabel {

    fileprivate let layoutManager = NSLayoutManager()
    fileprivate let textContainer = NSTextContainer(size: CGSize.zero)
    fileprivate var textStorage: NSTextStorage?


    override init(frame aRect:CGRect){
        super.init(frame: aRect)
        self.initialize()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.initialize()
    }

    func initialize(){

        let tap = UITapGestureRecognizer(target: self, action: #selector(self.handleTapOnLabel))
        self.isUserInteractionEnabled = true
        self.addGestureRecognizer(tap)
    }

    override var attributedText: NSAttributedString?{
        didSet{
            if let _attributedText = attributedText{
                self.textStorage = NSTextStorage(attributedString: _attributedText)

                self.layoutManager.addTextContainer(self.textContainer)
                self.textStorage?.addLayoutManager(self.layoutManager)

                self.textContainer.lineFragmentPadding = 0.0;
                self.textContainer.lineBreakMode = self.lineBreakMode;
                self.textContainer.maximumNumberOfLines = self.numberOfLines;
            }

        }
    }

    @objc func handleTapOnLabel(tapGesture:UITapGestureRecognizer){

        let locationOfTouchInLabel = tapGesture.location(in: tapGesture.view)
        let labelSize = tapGesture.view?.bounds.size
        let textBoundingBox = self.layoutManager.usedRect(for: self.textContainer)
        let textContainerOffset = CGPoint(x: ((labelSize?.width)! - textBoundingBox.size.width) * 0.5 - textBoundingBox.origin.x, y: ((labelSize?.height)! - textBoundingBox.size.height) * 0.5 - textBoundingBox.origin.y)

        let locationOfTouchInTextContainer = CGPoint(x: locationOfTouchInLabel.x - textContainerOffset.x, y: locationOfTouchInLabel.y - textContainerOffset.y)
        let indexOfCharacter = self.layoutManager.characterIndex(for: locationOfTouchInTextContainer, in: self.textContainer, fractionOfDistanceBetweenInsertionPoints: nil)


        self.attributedText?.enumerateAttribute(NSAttributedStringKey.link, in: NSMakeRange(0, (self.attributedText?.length)!), options: NSAttributedString.EnumerationOptions(rawValue: UInt(0)), using:{
            (attrs: Any?, range: NSRange, stop: UnsafeMutablePointer<ObjCBool>) in

            if NSLocationInRange(indexOfCharacter, range){
                if let _attrs = attrs{

                    UIApplication.shared.openURL(URL(string: _attrs as! String)!)
                }
            }
        })

    }}

Chrome ignores autocomplete="off"

I just updated to Chrome 49 and Diogo Cid's solution doesn't work anymore.

I made a different workaround hiding and removing the fields at run-time after the page is loaded.

Chrome now ignores the original workaround applying the credentials to the first displayed type="password" field and its previous type="text" field, so I have hidden both fields using CSS visibility: hidden;

<!-- HTML -->
<form>
    <!-- Fake fields -->
    <input class="chromeHack-autocomplete">
    <input type="password" class="chromeHack-autocomplete">

    <input type="text" placeholder="e-mail" autocomplete="off" />
    <input type="password" placeholder="Password" autocomplete="off" />
</form>

<!-- CSS -->
.chromeHack-autocomplete {
    height: 0px !important;
    width: 0px !important;
    opacity: 0 !important;
    padding: 0 !important; margin: 0 !important;
}

<!--JavaScript (jQuery) -->
jQuery(window).load(function() {
    $(".chromeHack-autocomplete").delay(100).hide(0, function() {
        $(this).remove();
    });
});

I know that it may seem not very elegant but it works.

How to make VS Code to treat other file extensions as certain language?

This works for me.

enter image description here

{
"files.associations": {"*.bitesize": "yaml"}
 }

How to make the 'cut' command treat same sequental delimiters as one?

As you comment in your question, awk is really the way to go. To use cut is possible together with tr -s to squeeze spaces, as kev's answer shows.

Let me however go through all the possible combinations for future readers. Explanations are at the Test section.

tr | cut

tr -s ' ' < file | cut -d' ' -f4

awk

awk '{print $4}' file

bash

while read -r _ _ _ myfield _
do
   echo "forth field: $myfield"
done < file

sed

sed -r 's/^([^ ]*[ ]*){3}([^ ]*).*/\2/' file

Tests

Given this file, let's test the commands:

$ cat a
this   is    line     1 more text
this      is line    2     more text
this    is line 3     more text
this is   line 4            more    text

tr | cut

$ cut -d' ' -f4 a
is
                        # it does not show what we want!


$ tr -s ' ' < a | cut -d' ' -f4
1
2                       # this makes it!
3
4
$

awk

$ awk '{print $4}' a
1
2
3
4

bash

This reads the fields sequentially. By using _ we indicate that this is a throwaway variable as a "junk variable" to ignore these fields. This way, we store $myfield as the 4th field in the file, no matter the spaces in between them.

$ while read -r _ _ _ a _; do echo "4th field: $a"; done < a
4th field: 1
4th field: 2
4th field: 3
4th field: 4

sed

This catches three groups of spaces and no spaces with ([^ ]*[ ]*){3}. Then, it catches whatever coming until a space as the 4th field, that it is finally printed with \1.

$ sed -r 's/^([^ ]*[ ]*){3}([^ ]*).*/\2/' a
1
2
3
4

Command prompt won't change directory to another drive

I suppose you are using Windows system.

Once you open CMD you would be shown with the default location i.e. like this

C:\Users\Admin - In your case its admin as mentioned else it will be the username of your computer

Consider if you want to move to E directory then simply type E:

This will move the user to E: Directory. Now change to what ever folder you want to point to in E: Drive

Ex: If you want to move to Software directory of E folder then first type

E:

then type the location of the folder

cd E:\Software

Viola

Install Chrome extension form outside the Chrome Web Store

For Windows, you can also whitelist your extension through Windows policies. The full steps are details in this answer, but there are quicker steps:

  1. Create the registry key HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\ExtensionInstallWhitelist.
  2. For each extension you want to whitelist, add a string value whose name should be a sequence number (starting at 1) and value is the extension ID.

For instance, in order to whitelist 2 extensions with ID aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa and bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb, create a string value with name 1 and value aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa, and a second value with name 2 and value bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb. This can be sum up by this registry file:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome]

[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Google\Chrome\ExtensionInstallWhitelist]
"1"="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
"2"="bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"

EDIT: actually, Chromium docs also indicate how to do it for other OS.

Check if argparse optional argument is set or not

In order to address @kcpr's comment on the (currently accepted) answer by @Honza Osobne

Unfortunately it doesn't work then the argument got it's default value defined.

one can first check if the argument was provided by comparing it with the Namespace object and providing the default=argparse.SUPPRESS option (see @hpaulj's and @Erasmus Cedernaes answers and this python3 doc) and if it hasn't been provided, then set it to a default value.

import argparse

parser = argparse.ArgumentParser()
parser.add_argument('--infile', default=argparse.SUPPRESS)
args = parser.parse_args()
if 'infile' in args: 
    # the argument is in the namespace, it's been provided by the user
    # set it to what has been provided
    theinfile = args.infile
    print('argument \'--infile\' was given, set to {}'.format(theinfile))
else:
    # the argument isn't in the namespace
    # set it to a default value
    theinfile = 'your_default.txt'
    print('argument \'--infile\' was not given, set to default {}'.format(theinfile))

Usage

$ python3 testargparse_so.py
argument '--infile' was not given, set to default your_default.txt

$ python3 testargparse_so.py --infile user_file.txt
argument '--infile' was given, set to user_file.txt

How to scroll table's "tbody" independent of "thead"?

thead {
  position: fixed;
  height: 10px; /* This is whatever height you want */
}
  tbody {
  position: fixed;
  margin-top: 10px; /* This has to match the height of thead */
  height: 300px; /* This is whatever height you want */
}

Is there a way for non-root processes to bind to "privileged" ports on Linux?

Answer at 2015/Sep:

ip6tables now supports IPV6 NAT: http://www.netfilter.org/projects/iptables/files/changes-iptables-1.4.17.txt

You will need kernel 3.7+

Proof:

[09:09:23] root@X:~ ip6tables -t nat -vnL
Chain PREROUTING (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination
    0     0 REDIRECT   tcp      eth0   *       ::/0                 ::/0                 tcp dpt:80 redir ports 8080
    0     0 REDIRECT   tcp      eth0   *       ::/0                 ::/0                 tcp dpt:443 redir ports 1443

Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain OUTPUT (policy ACCEPT 6148 packets, 534K bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain POSTROUTING (policy ACCEPT 6148 packets, 534K bytes)
 pkts bytes target     prot opt in     out     source               destination

How to set selectedIndex of select element using display text?

Add name attribute to your option:

<option value="0" name="Chicken">Chicken</option>

With that you can use the HTMLOptionsCollection.namedItem("Chicken").value to set the value of your select element.

How to get a jqGrid cell value when editing

General function to get value of cell with given row id and cell id

Create in your js code function:

function getCellValue(rowId, cellId) {
    var cell = jQuery('#' + rowId + '_' + cellId);        
    var val = cell.val();
    return val;
}

Example of use:

var clientId = getCellValue(15, 'clientId');

Dodgy, but works.

Open two instances of a file in a single Visual Studio session

Window menu, New Horizontal/Vertical Tab Group there will do, I think.

Creating Scheduled Tasks

You can use Task Scheduler Managed Wrapper:

using System;
using Microsoft.Win32.TaskScheduler;

class Program
{
   static void Main(string[] args)
   {
      // Get the service on the local machine
      using (TaskService ts = new TaskService())
      {
         // Create a new task definition and assign properties
         TaskDefinition td = ts.NewTask();
         td.RegistrationInfo.Description = "Does something";

         // Create a trigger that will fire the task at this time every other day
         td.Triggers.Add(new DailyTrigger { DaysInterval = 2 });

         // Create an action that will launch Notepad whenever the trigger fires
         td.Actions.Add(new ExecAction("notepad.exe", "c:\\test.log", null));

         // Register the task in the root folder
         ts.RootFolder.RegisterTaskDefinition(@"Test", td);

         // Remove the task we just created
         ts.RootFolder.DeleteTask("Test");
      }
   }
}

Alternatively you can use native API or go for Quartz.NET. See this for details.

Convert a String to a byte array and then back to the original String

Use [String.getBytes()][1] to convert to bytes and use [String(byte[] data)][2] constructor to convert back to string.

How to delete Project from Google Developers Console

The delete button is right there where the help page says it is.

To shut down a project using the Cloud Platform Console:

  • Open the Settings page in the Google Cloud Platform Console.

  • Click Select a project.

  • Select a project you wish to delete, and click Open.
  • Click Shut down.
  • Enter the Project ID and click Shut down.

Please note that there is a 7-day grace period before the project is actually purged from the system. Which means you won't be able to immediately create another project with the same name.

What are the integrity and crossorigin attributes?

integrity - defines the hash value of a resource (like a checksum) that has to be matched to make the browser execute it. The hash ensures that the file was unmodified and contains expected data. This way browser will not load different (e.g. malicious) resources. Imagine a situation in which your JavaScript files were hacked on the CDN, and there was no way of knowing it. The integrity attribute prevents loading content that does not match.

Invalid SRI will be blocked (Chrome developer-tools), regardless of cross-origin. Below NON-CORS case when integrity attribute does not match:

enter image description here

Integrity can be calculated using: https://www.srihash.org/ Or typing into console (link):

openssl dgst -sha384 -binary FILENAME.js | openssl base64 -A

crossorigin - defines options used when the resource is loaded from a server on a different origin. (See CORS (Cross-Origin Resource Sharing) here: https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS). It effectively changes HTTP requests sent by the browser. If the “crossorigin” attribute is added - it will result in adding origin: <ORIGIN> key-value pair into HTTP request as shown below.

enter image description here

crossorigin can be set to either “anonymous” or “use-credentials”. Both will result in adding origin: into the request. The latter however will ensure that credentials are checked. No crossorigin attribute in the tag will result in sending a request without origin: key-value pair.

Here is a case when requesting “use-credentials” from CDN:

<script 
        src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js"
        integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" 
        crossorigin="use-credentials"></script>

A browser can cancel the request if crossorigin incorrectly set.

enter image description here

Links
- https://www.w3.org/TR/cors/
- https://tools.ietf.org/html/rfc6454
- https://developer.mozilla.org/en-US/docs/Web/HTML/Element/link

Blogs
- https://frederik-braun.com/using-subresource-integrity.html
- https://web-security.guru/en/web-security/subresource-integrity

How large should my recv buffer be when calling recv in the socket library

For SOCK_STREAM socket, the buffer size does not really matter, because you are just pulling some of the waiting bytes and you can retrieve more in a next call. Just pick whatever buffer size you can afford.

For SOCK_DGRAM socket, you will get the fitting part of the waiting message and the rest will be discarded. You can get the waiting datagram size with the following ioctl:

#include <sys/ioctl.h>
int size;
ioctl(sockfd, FIONREAD, &size);

Alternatively you can use MSG_PEEK and MSG_TRUNC flags of the recv() call to obtain the waiting datagram size.

ssize_t size = recv(sockfd, buf, len, MSG_PEEK | MSG_TRUNC);

You need MSG_PEEK to peek (not receive) the waiting message - recv returns the real, not truncated size; and you need MSG_TRUNC to not overflow your current buffer.

Then you can just malloc(size) the real buffer and recv() datagram.

openpyxl - adjust column width size

A slight improvement of the above accepted answer, that I think is more pythonic (asking for forgiveness is better than asking for permission)

column_widths = []
for row in workSheet.iter_rows():
    for i, cell in enumerate(row):
        try:
            column_widths[i] = max(column_widths[i], len(str(cell.value)))
        except IndexError:
            column_widths.append(len(str(cell.value)))

for i, column_width in enumerate(column_widths):
    workSheet.column_dimensions[get_column_letter(i + 1)].width = column_width

Mailbox unavailable. The server response was: 5.7.1 Unable to relay for [email protected]

If you have Exchange 2010:

(In my case, the error message didn't contain " for [email protected]")

This shows how to add a receive connector: http://exchangeserverpro.com/how-to-configure-a-relay-connector-for-exchange-server-2010/

But I also needed to perform a step found here: http://recover-email.blogspot.com.au/2013/12/how-to-solve-exchange-smtp-server-error.html

  • Go to Exchange Management Shell and run the command
  • Get-ReceiveConnector "JiraTest" | Add-ADPermission -User "NT AUTHORITY\ANONYMOUS LOGON" -ExtendedRights "ms-Exch-SMTP-Accept-Any-Recipient"

While working on this, I ran the following on the affected server's PowerShell console until the error went away:

Send-MailMessage -From "[email protected]" -To "[email protected]" -Subject "Test Email" -Body "This is a test"

Converting a char to ASCII?

A char is an integral type. When you write

char ch = 'A';

you're setting the value of ch to whatever number your compiler uses to represent the character 'A'. That's usually the ASCII code for 'A' these days, but that's not required. You're almost certainly using a system that uses ASCII.

Like any numeric type, you can initialize it with an ordinary number:

char ch = 13;

If you want do do arithmetic on a char value, just do it: ch = ch + 1; etc.

However, in order to display the value you have to get around the assumption in the iostreams library that you want to display char values as characters rather than numbers. There are a couple of ways to do that.

std::cout << +ch << '\n';
std::cout << int(ch) << '\n'

Continuous CSS rotation animation on hover, animated back to 0deg on hover out

Cross browser compatible JS solution:

_x000D_
_x000D_
var e = document.getElementById('elem');_x000D_
var spin = false;_x000D_
_x000D_
var spinner = function(){_x000D_
e.classList.toggle('running', spin);_x000D_
if (spin) setTimeout(spinner, 2000);_x000D_
}_x000D_
_x000D_
e.onmouseover = function(){_x000D_
spin = true;_x000D_
spinner();_x000D_
};_x000D_
_x000D_
e.onmouseout = function(){_x000D_
spin = false;_x000D_
};
_x000D_
body { _x000D_
height:300px; _x000D_
}_x000D_
#elem {_x000D_
position:absolute;_x000D_
top:20%;_x000D_
left:20%;_x000D_
width:0; _x000D_
height:0;_x000D_
border-style: solid;_x000D_
border-width: 75px;_x000D_
border-color: red blue green orange;_x000D_
border-radius: 75px;_x000D_
}_x000D_
_x000D_
#elem.running {_x000D_
animation: spin 2s linear 0s infinite;_x000D_
}_x000D_
_x000D_
@keyframes spin { _x000D_
100% { transform: rotate(360deg); } _x000D_
}
_x000D_
<div id="elem"></div>
_x000D_
_x000D_
_x000D_

How to insert a value that contains an apostrophe (single quote)?

Another way of escaping the apostrophe is to write a string literal:

insert into Person (First, Last) values (q'[Joe]', q'[O'Brien]')

This is a better approach, because:

  1. Imagine you have an Excel list with 1000's of names you want to upload to your database. You may simply create a formula to generate 1000's of INSERT statements with your cell contents instead of looking manually for apostrophes.

  2. It works for other escape characters too. For example loading a Regex pattern value, i.e. ^( *)(P|N)?( *)|( *)((<|>)\d\d?)?( *)|( )(((?i)(in|not in)(?-i) ?(('[^']+')(, ?'[^']+'))))?( *)$ into a table.

How do I turn off Oracle password expiration?

I believe that the password expiration behavior, by default, is to never expire. However, you could set up a profile for your dev user set and set the PASSWORD_LIFE_TIME. See the orafaq for more details. You can see here for an example of one person's perspective and usage.

How to fill in proxy information in cntlm config file?

The solution takes two steps!

First, complete the user, domain, and proxy fields in cntlm.ini. The username and domain should probably be whatever you use to log in to Windows at your office, eg.

Username            employee1730
Domain              corporate
Proxy               proxy.infosys.corp:8080

Then test cntlm with a command such as

cntlm.exe -c cntlm.ini -I -M http://www.bbc.co.uk

It will ask for your password (again whatever you use to log in to Windows_). Hopefully it will print 'http 200 ok' somewhere, and print your some cryptic tokens authentication information. Now add these to cntlm.ini, eg:

Auth            NTLM
PassNT          A2A7104B1CE00000000000000007E1E1
PassLM          C66000000000000000000000008060C8

Finally, set the http_proxy environment variable in Windows (assuming you didn't change with the Listen field which by default is set to 3128) to the following

http://localhost:3128

The connection to adb is down, and a severe error has occurred

For me the following worked:

  1. Kill adb.exe from Task Manager

  2. Restart Eclipse as administrator

  3. For my app, the target was Google APIs level 10.. I went to Window-> AVD Manager and the entry for "Google APIs level 10" had a broken instead of a green tick - so I just clicked the entry and clicked the "repair" button and problem was fixed

(It was probably only 3 above..)

Save each sheet in a workbook to separate CSV files

And here's my solution should work with Excel > 2000, but tested only on 2007:

Private Sub SaveAllSheetsAsCSV()
On Error GoTo Heaven

' each sheet reference
Dim Sheet As Worksheet
' path to output to
Dim OutputPath As String
' name of each csv
Dim OutputFile As String

Application.ScreenUpdating = False
Application.DisplayAlerts = False
Application.EnableEvents = False

' ask the user where to save
OutputPath = InputBox("Enter a directory to save to", "Save to directory", Path)

If OutputPath <> "" Then

    ' save for each sheet
    For Each Sheet In Sheets

        OutputFile = OutputPath & "\" & Sheet.Name & ".csv"

        ' make a copy to create a new book with this sheet
        ' otherwise you will always only get the first sheet
        Sheet.Copy
        ' this copy will now become active
        ActiveWorkbook.SaveAs FileName:=OutputFile, FileFormat:=xlCSV, CreateBackup:=False
        ActiveWorkbook.Close
    Next

End If

Finally:
Application.ScreenUpdating = True
Application.DisplayAlerts = True
Application.EnableEvents = True

Exit Sub

Heaven:
MsgBox "Couldn't save all sheets to CSV." & vbCrLf & _
        "Source: " & Err.Source & " " & vbCrLf & _
        "Number: " & Err.Number & " " & vbCrLf & _
        "Description: " & Err.Description & " " & vbCrLf

GoTo Finally
End Sub

(OT: I wonder if SO will replace some of my minor blogging)

Android Studio - Emulator - eglSurfaceAttrib not implemented

Fix: Unlock your device before running it.

Hi Guys: Think I may have a fix for this:

Sounds ridiculous but try unlocking your Virtual Device; i.e. use your mouse to swipe and open. Your app should then work!!

Single Result from Database by using mySQLi

When just a single result is needed, then no loop should be used. Just fetch the row right away.

  • In case you need to fetch the entire row into associative array:

      $row = $result->fetch_assoc();
    
  • in case you need just a single value

      $row = $result->fetch_row();
      $value = $row[0] ?? false;
    

The last example will return the first column from the first returned row, or false if no row was returned. It can be also shortened to a single line,

$value = $result->fetch_row()[0] ?? false;

Below are complete examples for different use cases

Variables to be used in the query

When variables are to be used in the query, then a prepared statement must be used. For example, given we have a variable $id:

$query = "SELECT ssfullname, ssemail FROM userss WHERE ud=?";
$stmt = $conn->prepare($query);
$stmt->bind_param("s", $id);
$stmt->execute()
$result = $stmt->get_result();
$row = $result->fetch_assoc();

// in case you need just a single value
$query = "SELECT count(*) FROM userss WHERE id=?";
$stmt = $conn->prepare($query);
$stmt->bind_param("s", $id);
$stmt->execute()
$result = $stmt->get_result();
$value = $result->fetch_row()[0] ?? false;

The detailed explanation of the above process can be found in my article. As to why you must follow it is explained in this famous question

No variables in the query

In your case, where no variables to be used in the query, you can use the query() method:

$query = "SELECT ssfullname, ssemail FROM userss ORDER BY ssid";
$result = $conn->query($query);
// in case you need an array
$row = $result->fetch_assoc();
// OR in case you need just a single value
$value = $result->fetch_row()[0] ?? false;

By the way, although using raw API while learning is okay, consider using some database abstraction library or at least a helper function in the future:

// using a helper function
$sql = "SELECT email FROM users WHERE id=?";
$value = prepared_select($conn, $sql, [$id])->fetch_row[0] ?? false;

// using a database helper class
$email = $db->getCol("SELECT email FROM users WHERE id=?", [$id]);

As you can see, although a helper function can reduce the amount of code, a class' method could encapsulate all the repetitive code inside, making you to write only meaningful parts - the query, the input parameters and the desired result format (in the form of the method's name).

Java to Jackson JSON serialization: Money fields

Inspired by Steve, and as the updates for Java 11. Here's how we did the BigDecimal reformatting to avoid scientific notation.

public class PriceSerializer extends JsonSerializer<BigDecimal> {
    @Override
    public void serialize(BigDecimal value, JsonGenerator jgen, SerializerProvider provider) throws IOException {
        // Using writNumber and removing toString make sure the output is number but not String.
        jgen.writeNumber(value.setScale(2, RoundingMode.HALF_UP));
    }
}

Mocking HttpClient in unit tests

Here's a simple solution, which worked well for me.

Using the moq mocking library.

// ARRANGE
var handlerMock = new Mock<HttpMessageHandler>(MockBehavior.Strict);
handlerMock
   .Protected()
   // Setup the PROTECTED method to mock
   .Setup<Task<HttpResponseMessage>>(
      "SendAsync",
      ItExpr.IsAny<HttpRequestMessage>(),
      ItExpr.IsAny<CancellationToken>()
   )
   // prepare the expected response of the mocked http call
   .ReturnsAsync(new HttpResponseMessage()
   {
      StatusCode = HttpStatusCode.OK,
      Content = new StringContent("[{'id':1,'value':'1'}]"),
   })
   .Verifiable();

// use real http client with mocked handler here
var httpClient = new HttpClient(handlerMock.Object)
{
   BaseAddress = new Uri("http://test.com/"),
};

var subjectUnderTest = new MyTestClass(httpClient);

// ACT
var result = await subjectUnderTest
   .GetSomethingRemoteAsync('api/test/whatever');

// ASSERT
result.Should().NotBeNull(); // this is fluent assertions here...
result.Id.Should().Be(1);

// also check the 'http' call was like we expected it
var expectedUri = new Uri("http://test.com/api/test/whatever");

handlerMock.Protected().Verify(
   "SendAsync",
   Times.Exactly(1), // we expected a single external request
   ItExpr.Is<HttpRequestMessage>(req =>
      req.Method == HttpMethod.Get  // we expected a GET request
      && req.RequestUri == expectedUri // to this uri
   ),
   ItExpr.IsAny<CancellationToken>()
);

Source: https://gingter.org/2018/07/26/how-to-mock-httpclient-in-your-net-c-unit-tests/

Disable copy constructor

Make SymbolIndexer( const SymbolIndexer& ) private. If you're assigning to a reference, you're not copying.

Show or hide element in React

Here comes the simple, effective and best solution with a Classless React Component for show/hide the elements. Use of React-Hooks which is available in the latest create-react-app project that uses React 16

import React, {useState} from 'react';
function RenderPara(){
const [showDetail,setShowDetail] = useState(false);

const handleToggle = () => setShowDetail(!showDetail);

return (
<React.Fragment>
    <h3>
        Hiding some stuffs 
    </h3>
    <button onClick={handleToggle}>Toggle View</button>
   {showDetail && <p>
        There are lot of other stuffs too
    </p>}
</React.Fragment>)

}  
export default RenderPara;

Happy Coding :)

Fastest Convert from Collection to List<T>

Since 3.5, anything inherited from System.Collection.IEnumerable has the convenient extension method OfType available.

If your collection is from ICollection or IEnumerable, you can just do this:

List<ManagementObject> managementList = ManagementObjectCollection.OfType<ManagementObject>().ToList();

Can't find any way simpler. : )

How To Set A JS object property name from a variable

This is the way to dynamically set the value

var jsonVariable = {};
for (var i = 1; i < 3; i++) {
    var jsonKey = i + 'name';
    jsonVariable[jsonKey] = 'name' + i;
}

How to split large text file in windows?

you can split using a third party software http://www.hjsplit.org/, for example give yours input that could be upto 9GB and then split, in my case I split 10 MB each enter image description here

Java SSL: how to disable hostname verification

In case you're using apache's http-client 4:

SSLConnectionSocketFactory sslConnectionSocketFactory = 
    new SSLConnectionSocketFactory(sslContext,
             new String[] { "TLSv1.2" }, null, new HostnameVerifier() {
                    public boolean verify(String arg0, SSLSession arg1) {
                            return true;
            }
      });

How to read PDF files using Java?

with Apache PDFBox it goes like this:

PDDocument document = PDDocument.load(new File("test.pdf"));
if (!document.isEncrypted()) {
    PDFTextStripper stripper = new PDFTextStripper();
    String text = stripper.getText(document);
    System.out.println("Text:" + text);
}
document.close();

Get value of a merged cell of an excel from its cell address in vba

Even if it is really discouraged to use merge cells in Excel (use Center Across Selection for instance if needed), the cell that "contains" the value is the one on the top left (at least, that's a way to express it).

Hence, you can get the value of merged cells in range B4:B11 in several ways:

  • Range("B4").Value
  • Range("B4:B11").Cells(1).Value
  • Range("B4:B11").Cells(1,1).Value

You can also note that all the other cells have no value in them. While debugging, you can see that the value is empty.

Also note that Range("B4:B11").Value won't work (raises an execution error number 13 if you try to Debug.Print it) because it returns an array.

How can I make IntelliJ IDEA update my dependencies from Maven?

Apart from checking 'Import Maven projects automatically', make sure that settings.xml file from File > Settings > Maven > User Settings file exist, If doesn't exist then override and provide your settings.xml file path.

How to catch segmentation fault in Linux?

On Linux we can have these as exceptions, too.

Normally, when your program performs a segmentation fault, it is sent a SIGSEGV signal. You can set up your own handler for this signal and mitigate the consequences. Of course you should really be sure that you can recover from the situation. In your case, I think, you should debug your code instead.

Back to the topic. I recently encountered a library (short manual) that transforms such signals to exceptions, so you can write code like this:

try
{
    *(int*) 0 = 0;
}
catch (std::exception& e)
{
    std::cerr << "Exception caught : " << e.what() << std::endl;
}

Didn't check it, though. Works on my x86-64 Gentoo box. It has a platform-specific backend (borrowed from gcc's java implementation), so it can work on many platforms. It just supports x86 and x86-64 out of the box, but you can get backends from libjava, which resides in gcc sources.

jQuery Ajax error handling, show custom exception messages

Controller:

public class ClientErrorHandler : FilterAttribute, IExceptionFilter
{
    public void OnException(ExceptionContext filterContext)
    {
        var response = filterContext.RequestContext.HttpContext.Response;
        response.Write(filterContext.Exception.Message);
        response.ContentType = MediaTypeNames.Text.Plain;
        filterContext.ExceptionHandled = true;
    }
}

[ClientErrorHandler]
public class SomeController : Controller
{
    [HttpPost]
    public ActionResult SomeAction()
    {
        throw new Exception("Error message");
    }
}

View script:

$.ajax({
    type: "post", url: "/SomeController/SomeAction",
    success: function (data, text) {
        //...
    },
    error: function (request, status, error) {
        alert(request.responseText);
    }
});

How to compare if two structs, slices or maps are equal?

You can use reflect.DeepEqual, or you can implement your own function (which performance wise would be better than using reflection):

http://play.golang.org/p/CPdfsYGNy_

m1 := map[string]int{   
    "a":1,
    "b":2,
}
m2 := map[string]int{   
    "a":1,
    "b":2,
}
fmt.Println(reflect.DeepEqual(m1, m2))

How do I pass a list as a parameter in a stored procedure?

Azure DB, Azure Data WH and from SQL Server 2016, you can use STRING_SPLIT to achieve a similar result to what was described by @sparrow.

Recycling code from @sparrow

WHERE user_id IN (SELECT value FROM STRING_SPLIT( @user_id_list, ',')

Simple and effective way of accepting a list of values into a Stored Procedure

fstream won't create a file

This will do:

#include <fstream>
#include <iostream>
using std::fstream;

int main(int argc, char *argv[]) {
    fstream file;
    file.open("test.txt",std::ios::out);
    file << fflush;
    file.close();
}

Swift GET request with parameters

Use NSURLComponents to build your NSURL like this

var urlComponents = NSURLComponents(string: "https://www.google.de/maps/")!

urlComponents.queryItems = [
  NSURLQueryItem(name: "q", value: String(51.500833)+","+String(-0.141944)),
  NSURLQueryItem(name: "z", value: String(6))
]
urlComponents.URL // returns https://www.google.de/maps/?q=51.500833,-0.141944&z=6

font: https://www.ralfebert.de/snippets/ios/encoding-nsurl-get-parameters/

Combine two columns of text in pandas dataframe

Here is an implementation that I find very versatile:

In [1]: import pandas as pd 

In [2]: df = pd.DataFrame([[0, 'the', 'quick', 'brown'],
   ...:                    [1, 'fox', 'jumps', 'over'], 
   ...:                    [2, 'the', 'lazy', 'dog']],
   ...:                   columns=['c0', 'c1', 'c2', 'c3'])

In [3]: def str_join(df, sep, *cols):
   ...:     from functools import reduce
   ...:     return reduce(lambda x, y: x.astype(str).str.cat(y.astype(str), sep=sep), 
   ...:                   [df[col] for col in cols])
   ...: 

In [4]: df['cat'] = str_join(df, '-', 'c0', 'c1', 'c2', 'c3')

In [5]: df
Out[5]: 
   c0   c1     c2     c3                cat
0   0  the  quick  brown  0-the-quick-brown
1   1  fox  jumps   over   1-fox-jumps-over
2   2  the   lazy    dog     2-the-lazy-dog

How to change lowercase chars to uppercase using the 'keyup' event?

I success use this code to change uppercase

$(document).ready(function(){
$('#kode').keyup(function()
{
    $(this).val($(this).val().toUpperCase());
});
});
</script>

in your html tag bootstraps

<div class="form-group">
                            <label class="control-label col-md-3">Kode</label>
                            <div class="col-md-9 col-sm-9 col-xs-12">
                                <input name="kode" placeholder="Kode matakul" id="kode" class="form-control col-md-7 col-xs-12" type="text" required="required" maxlength="15">
                                <span class="fa fa-user form-control-feedback right" aria-hidden="true"></span>
                            </div>
                        </div>

java.math.BigInteger cannot be cast to java.lang.Integer

As we see from the javaDoc, BigInteger is not a subclass of Integer:

java.lang.Object                      java.lang.Object
   java.lang.Number                       java.lang.Number
      java.math.BigInteger                    java.lang.Integer

And that's the reason why casting from BigInteger to Integer is impossible.

Casting of java primitives will do some conversion (like casting from double to int) while casting of types will never transform classes.

Detect IE version (prior to v9) in JavaScript

I made a convenient underscore mixin for this.

_.isIE();        // Any version of IE?
_.isIE(9);       // IE 9?
_.isIE([7,8,9]); // IE 7, 8 or 9?

_x000D_
_x000D_
_.mixin({_x000D_
  isIE: function(mixed) {_x000D_
    if (_.isUndefined(mixed)) {_x000D_
      mixed = [7, 8, 9, 10, 11];_x000D_
    } else if (_.isNumber(mixed)) {_x000D_
      mixed = [mixed];_x000D_
    }_x000D_
    for (var j = 0; j < mixed.length; j++) {_x000D_
      var re;_x000D_
      switch (mixed[j]) {_x000D_
        case 11:_x000D_
          re = /Trident.*rv\:11\./g;_x000D_
          break;_x000D_
        case 10:_x000D_
          re = /MSIE\s10\./g;_x000D_
          break;_x000D_
        case 9:_x000D_
          re = /MSIE\s9\./g;_x000D_
          break;_x000D_
        case 8:_x000D_
          re = /MSIE\s8\./g;_x000D_
          break;_x000D_
        case 7:_x000D_
          re = /MSIE\s7\./g;_x000D_
          break;_x000D_
      }_x000D_
_x000D_
      if (!!window.navigator.userAgent.match(re)) {_x000D_
        return true;_x000D_
      }_x000D_
    }_x000D_
_x000D_
    return false;_x000D_
  }_x000D_
});_x000D_
_x000D_
console.log(_.isIE());_x000D_
console.log(_.isIE([7, 8, 9]));_x000D_
console.log(_.isIE(11));
_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
_x000D_
_x000D_
_x000D_

Load local JSON file into variable

For the given json format as in file ~/my-app/src/db/abc.json:

  [
      {
        "name":"Ankit",
        "id":1
      },
      {
        "name":"Aditi",
        "id":2
      },
      {
        "name":"Avani",
        "id":3
      }
  ]

inorder to import to .js file like ~/my-app/src/app.js:

 const json = require("./db/abc.json");

 class Arena extends React.Component{
   render(){
     return(
       json.map((user)=>
        {
          return(
            <div>{user.name}</div>
          )
        }
       )
      }
    );
   }
 }

 export default Arena;

Output:

Ankit Aditi Avani

Android java.exe finished with non-zero exit value 1

compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7
    }

add this to your gradle Build. It worked for me

how to access downloads folder in android?

Updated

getExternalStoragePublicDirectory() is deprecated.

To get the download folder from a Fragment,

val downloadFolder = requireContext().getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS)

From an Activity,

val downloadFolder = getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS)

downloadFolder.listFiles() will list the Files.

downloadFolder?.path will give you the String path of the download folder.

Multiple -and -or in PowerShell Where-Object statement

I found the solution here:

How to properly -filter multiple strings in a PowerShell copy script

You have to use -Include flag for Get-ChildItem

My Example:

$Location = "C:\user\files" 
$result = (Get-ChildItem $Location\* -Include *.png, *.gif, *.jpg)

Dont forget put "*" after path location.

Convert date to another timezone in JavaScript

You can use to toLocaleString() method for setting the timezone.

new Date().toLocaleString('en-US', { timeZone: 'Indian/Christmas' })

For India you can use "Indian/Christmas" and the following are the various timeZones,

"Antarctica/Davis",
    "Asia/Bangkok",
    "Asia/Hovd",
    "Asia/Jakarta",
    "Asia/Phnom_Penh",
    "Asia/Pontianak",
    "Asia/Saigon",
    "Asia/Vientiane",
    "Etc/GMT-7",
    "Indian/Christmas"

setting an environment variable in virtualenv

Update

As of 17th May 2017 the README of autoenv states that direnv is probably the better option and implies autoenv is no longer maintained.

Old answer

I wrote autoenv to do exactly this:

https://github.com/kennethreitz/autoenv

How do I implement __getattribute__ without an infinite recursion error?

You get a recursion error because your attempt to access the self.__dict__ attribute inside __getattribute__ invokes your __getattribute__ again. If you use object's __getattribute__ instead, it works:

class D(object):
    def __init__(self):
        self.test=20
        self.test2=21
    def __getattribute__(self,name):
        if name=='test':
            return 0.
        else:
            return object.__getattribute__(self, name)

This works because object (in this example) is the base class. By calling the base version of __getattribute__ you avoid the recursive hell you were in before.

Ipython output with code in foo.py:

In [1]: from foo import *

In [2]: d = D()

In [3]: d.test
Out[3]: 0.0

In [4]: d.test2
Out[4]: 21

Update:

There's something in the section titled More attribute access for new-style classes in the current documentation, where they recommend doing exactly this to avoid the infinite recursion.

Delete column from pandas DataFrame

The dot syntax works in JavaScript, but not in Python.

  • Python: del df['column_name']
  • JavaScript: del df['column_name'] or del df.column_name

How do I download/extract font from chrome developers tools?

Although Marcelo's solution seems to be working great, you may not need to download the font at all! Just link to it remotely.

E.g the font is hosted on example.com, do

@font-face {
  font-family: "Font Name";
  font-style: normal;
  src: url(http://example.com/webfonts/font-name.woff);
}

You may easily figure out the direct url to the font by looking into css code from example.com and see how they linked the file.

Jackson and generic type reference

'JavaType' works !! I was trying to unmarshall (deserialize) a List in json String to ArrayList java Objects and was struggling to find a solution since days.
Below is the code that finally gave me solution. Code:

JsonMarshallerUnmarshaller<T> {
    T targetClass;

    public ArrayList<T> unmarshal(String jsonString) {
        ObjectMapper mapper = new ObjectMapper();

        AnnotationIntrospector introspector = new JacksonAnnotationIntrospector();
        mapper.getDeserializationConfig()
            .withAnnotationIntrospector(introspector);

        mapper.getSerializationConfig()
            .withAnnotationIntrospector(introspector);
        JavaType type = mapper.getTypeFactory().
            constructCollectionType(
                ArrayList.class, 
                targetclass.getClass());

        try {
            Class c1 = this.targetclass.getClass();
            Class c2 = this.targetclass1.getClass();
            ArrayList<T> temp = (ArrayList<T>) 
                mapper.readValue(jsonString,  type);
            return temp ;
        } catch (JsonParseException e) {
            e.printStackTrace();
        } catch (JsonMappingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return null ;
    }  
}

How to check if MySQL returns null/empty?

select FOUND_ROWS();

will return no. of records selected by select query.

jQuery AJAX Call to PHP Script with JSON Return

I recommend you use:

var returnedData = JSON.parse(data);

to convert the JSON string (if it is just text) to a JavaScript object.

How do I trigger a macro to run after a new mail is received in Outlook?

Try something like this inside ThisOutlookSession:

Private Sub Application_NewMail()
    Call Your_main_macro
End Sub

My outlook vba just fired when I received an email and had that application event open.

Edit: I just tested a hello world msg box and it ran after being called in the application_newmail event when an email was received.

Storing database records into array

$memberId =$_SESSION['TWILLO']['Id'];

    $QueryServer=mysql_query("select * from smtp_server where memberId='".$memberId."'");
    $data = array();
    while($ser=mysql_fetch_assoc($QueryServer))
    {

     $data[$ser['Id']] =array('ServerName','ServerPort','Server_limit','email','password','status');

    }

Root element is missing

If you are loading the XML file from a remote location, I would check to see if the file is actually being downloaded correctly using a sniffer like Fiddler.

I wrote a quick console app to run your code and parse the file and it works fine for me.

Formatting DataBinder.Eval data

Thanks to all. I had been stuck on standard format strings for some time. I also used a custom function in VB.

Mark Up:-

<asp:Label ID="Label3" runat="server" text='<%# Formatlabel(DataBinder.Eval(Container.DataItem, "psWages1D")) %>'/>

Code behind:-

Public Function fLabel(ByVal tval) As String
   fLabel = tval.ToString("#,##0.00%;(#,##0.00%);Zero")
End Function

jQuery .css("margin-top", value) not updating in IE 8 (Standards mode)

try this method

$("your id or class name").css({ 'margin-top': '18px' });  

Copy directory contents into a directory with python

I found this code working:

from distutils.dir_util import copy_tree

# copy subdirectory example
fromDirectory = "/a/b/c"
toDirectory = "/x/y/z"

copy_tree(fromDirectory, toDirectory)

Reference:

React Router Pass Param to Component

Since react-router v5.1 with hooks:

import { useParams } from 'react-router';

export default function DetailsPage() {
  const { id } = useParams();
}

See https://reacttraining.com/blog/react-router-v5-1/

How do I convert a list into a string with spaces in Python?

Why don't you add a space in the items of the list itself, like :
list = ["how ", "are ", "you "]

Return a 2d array from a function

#include <iostream>
using namespace std ;

typedef int (*Type)[3][3] ;

Type Demo_function( Type ); //prototype

int main (){
    cout << "\t\t!!!!!Passing and returning 2D array from function!!!!!\n"

    int array[3][3] ;
    Type recieve , ptr = &array;
    recieve = Demo_function( ptr ) ;

    for ( int i = 0 ;  i < 3 ; i ++ ){
        for ( int j = 0 ; j < 3 ; j ++ ){
            cout <<  (*recieve)[i][j] << " " ;
        }
    cout << endl ; 
    }

return 0 ;
}


Type Demo_function( Type array ){/*function definition */

    cout << "Enter values : \n" ;
    for (int i =0 ;  i < 3 ; i ++)
        for ( int j = 0 ; j < 3 ; j ++ )
            cin >> (*array)[i][j] ;

    return array ; 
}

make *** no targets specified and no makefile found. stop

If you create Makefile in the VSCode, your makefile doesnt run. I don't know the cause of this issue. Maybe the configuration of the file is not added to system. But I solved this way. delete created makefile, then go to project directory and right click mouse later create a file and named Makefile. After fill the Makefile and run it. It will work.

Could not find module "@angular-devkit/build-angular"

I just did below and it worked.

npm install --save-dev

Entity Framework vs LINQ to SQL

The answers here have covered many of the differences between Linq2Sql and EF, but there's a key point which has not been given much attention: Linq2Sql only supports SQL Server whereas EF has providers for the following RDBMS's:

Provided by Microsoft:

  • ADO.NET drivers for SQL Server, OBDC and OLE DB

Via third party providers:

  • MySQL
  • Oracle
  • DB2
  • VistaDB
  • SQLite
  • PostgreSQL
  • Informix
  • U2
  • Sybase
  • Synergex
  • Firebird
  • Npgsql

to name a few.

This makes EF a powerful programming abstraction over your relational data store, meaning developers have a consistent programming model to work with regardless of the underlying data store. This could be very useful in situations where you are developing a product that you want to ensure will interoperate with a wide range of common RDBMS's.

Another situation where that abstraction is useful is where you are part of a development team that works with a number of different customers, or different business units within an organisation, and you want to improve developer productivity by reducing the number of RDBMS's they have to become familiar with in order to support a range of different applications on top of different RDBMS's.

Jquery Chosen plugin - dynamically populate list by Ajax

This might be helpful. You have to just trigger an event.

$("#DropDownID").trigger("liszt:updated");

Where "DropDownID" is ID of <select>.

More info here: http://harvesthq.github.com/chosen/

How do I add an integer value with javascript (jquery) to a value that's returning a string?

parseInt() will force it to be type integer, or will be NaN (not a number) if it cannot perform the conversion.

var currentValue = parseInt($("#replies").text(),10);

The second paramter (radix) makes sure it is parsed as a decimal number.

Can a unit test project load the target application's app.config file?

In Visual Studio 2008 I added the app.config file to the test project as an existing item and selected copy as link in order to make sure it's not duplicated. That way I only have one copy in my solution. With several test projects it comes in really handy!

Add Existing Item

Add As Link

How to get database structure in MySQL via query

A variation of the first answer that I found useful

Open your command prompt and enter (you dont have to be logged into your mysql server)

mysqldump -hlocalhost -u<root> -p<password>  <dbname>  --compact --no-data > </path_to_mydump/>mysql.dmp

"int cannot be dereferenced" in Java

id is of primitive type int and not an Object. You cannot call methods on a primitive as you are doing here :

id.equals

Try replacing this:

        if (id.equals(list[pos].getItemNumber())){ //Getting error on "equals"

with

        if (id == list[pos].getItemNumber()){ //Getting error on "equals"

General error: 1364 Field 'user_id' doesn't have a default value

User Auth::user()->id instead.

Here is the correct way :

//PostController
Post::create(request([
    'body' => request('body'),
    'title' => request('title'),
    'user_id' => Auth::user()->id
]));

If your user is authenticated, Then Auth::user()->id will do the trick.

How to terminate a process in vbscript

Just type in the following command: taskkill /f /im (program name) To find out the im of your program open task manager and look at the process while your program is running. After the program has run a process will disappear from the task manager; that is your program.

Chrome disable SSL checking for sites?

To disable the errors windows related with certificates you can start Chrome from console and use this option: --ignore-certificate-errors.

"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --ignore-certificate-errors

You should use it for testing purposes. A more complete list of options is here: http://peter.sh/experiments/chromium-command-line-switches/