Programs & Examples On #Prime factoring

The decomposition of composite numbers into a unique list of prime numbers that, when multiplied together, equal that number.

Algorithm to find Largest prime factor of a number

My answer is based on Triptych's, but improves a lot on it. It is based on the fact that beyond 2 and 3, all the prime numbers are of the form 6n-1 or 6n+1.

var largestPrimeFactor;
if(n mod 2 == 0)
{
    largestPrimeFactor = 2;
    n = n / 2 while(n mod 2 == 0);
}
if(n mod 3 == 0)
{
    largestPrimeFactor = 3;
    n = n / 3 while(n mod 3 == 0);
}

multOfSix = 6;
while(multOfSix - 1 <= n)
{
    if(n mod (multOfSix - 1) == 0)
    {
        largestPrimeFactor = multOfSix - 1;
        n = n / largestPrimeFactor while(n mod largestPrimeFactor == 0);
    }

    if(n mod (multOfSix + 1) == 0)
    {
        largestPrimeFactor = multOfSix + 1;
        n = n / largestPrimeFactor while(n mod largestPrimeFactor == 0);
    }
    multOfSix += 6;
}

I recently wrote a blog article explaining how this algorithm works.

I would venture that a method in which there is no need for a test for primality (and no sieve construction) would run faster than one which does use those. If that is the case, this is probably the fastest algorithm here.

Comparing two branches in Git?

git diff branch_1..branch_2

That will produce the diff between the tips of the two branches. If you'd prefer to find the diff from their common ancestor to test, you can use three dots instead of two:

git diff branch_1...branch_2

Flask raises TemplateNotFound error even though template file exists

I think Flask uses the directory templates by default. So your code should be like this

suppose this is your hello.py

from flask import Flask,render_template

app=Flask(__name__,template_folder='template')


@app.route("/")
def home():
    return render_template('home.html')

@app.route("/about/")
def about():
    return render_template('about.html')

if __name__=="__main__":
    app.run(debug=True)

And you work space structure like

project/
    hello.py        
    template/
         home.html
         about.html    
    static/
           js/
             main.js
           css/
               main.css

also you have create two html files with name of home.html and about.html and put those files in templates folder.

Hive insert query like SQL

Slightly better version of the unique2 suggestion is below:

insert overwrite table target_table
select * from 
(
select stack(
    3,                 # generating new table with 3 records
    'John', 80,        # record_1
    'Bill', 61         # record_2
    'Martha', 101      # record_3
    ) 
) s;

Which does not require the hack with using an already exiting table.

"Cannot instantiate the type..."

I had the very same issue, not being able to instantiate the type of a class which I was absolutely sure was not abstract. Turns out I was implementing an abstract class from Java.util instead of implementing my own class.

So if the previous answers did not help you, please check that you import the class you actually wanted to import, and not something else with the same name that you IDE might have hinted you.

For example, if you were trying to instantiate the class Queue from the package myCollections which you coded yourself :

import java.util.*; // replace this line
import myCollections.Queue; // by this line

     Queue<Edge> theQueue = new Queue<Edge>();

Initialization of an ArrayList in one line

Actually, probably the "best" way to initialize the ArrayList is the method you wrote, as it does not need to create a new List in any way:

ArrayList<String> list = new ArrayList<String>();
list.add("A");
list.add("B");
list.add("C");

The catch is that there is quite a bit of typing required to refer to that list instance.

There are alternatives, such as making an anonymous inner class with an instance initializer (also known as an "double brace initialization"):

ArrayList<String> list = new ArrayList<String>() {{
    add("A");
    add("B");
    add("C");
}};

However, I'm not too fond of that method because what you end up with is a subclass of ArrayList which has an instance initializer, and that class is created just to create one object -- that just seems like a little bit overkill to me.

What would have been nice was if the Collection Literals proposal for Project Coin was accepted (it was slated to be introduced in Java 7, but it's not likely to be part of Java 8 either.):

List<String> list = ["A", "B", "C"];

Unfortunately it won't help you here, as it will initialize an immutable List rather than an ArrayList, and furthermore, it's not available yet, if it ever will be.

Add space between <li> elements

add:

margin: 0 0 3px 0;

to your #access li and move

background: #0f84e8; /* Show a solid color for older browsers */

to the #access a and take out the border-bottom. Then it will work

Here: http://jsfiddle.net/bpmKW/4/

Bootstrap get div to align in the center

When I align elements in center I use the bootstrap class text-center:

<div class="text-center">Centered content goes here</div>

Access: Move to next record until EOF

Keeping the code simple is always my advice:

If IsNull(Me.Id) = True Then
  DoCmd.GoToRecord , , acNext
Else
  DoCmd.GoToRecord , , acLast
End If

How do I use Docker environment variable in ENTRYPOINT array?

After much pain, and great assistance from @vitr et al above, i decided to try

  • standard bash substitution
  • shell form of ENTRYPOINT (great tip from above)

and that worked.

ENV LISTEN_PORT=""

ENTRYPOINT java -cp "app:app/lib/*" hello.Application --server.port=${LISTEN_PORT:-80}

e.g.

docker run --rm -p 8080:8080 -d --env LISTEN_PORT=8080 my-image

and

docker run --rm -p 8080:80 -d my-image

both set the port correctly in my container

Refs

see https://www.cyberciti.biz/tips/bash-shell-parameter-substitution-2.html

How to dynamically remove items from ListView on a button click?

Have a button on list and let it onclick feature in xml like to get postion first

public void OnClickButton(View V){
  final int postion = listView.getPositionForView(V);
    System.out.println("postion selected is : "+postion);
Delete(postion);

}
public void Delete(int position){
    if (adapter.getCount() > 0) {

        //Log.d("largest no is",""+largestitemno);
        //deleting the latest added by subtracting one 1 
        comment = (GenrricStoring) adapter.getItem(position);
        //Log.d("Deleting item is: ",""+comment);
        dbconnection.deleteComment(comment);
        List<GenrricStoring> values = dbconnection.getAllComments();
        //updating the content on the screen
        this.adapter = new UserItemAdapter(this, android.R.layout.simple_list_item_1, values);
        listView.setAdapter(adapter);
    }
    else
    {
        int duration = Toast.LENGTH_SHORT;
        //for showing nothing is left in the list
        Toast toast = Toast.makeText(getApplicationContext(),"Db is empty", duration);
        toast.setGravity(Gravity.CENTER, 0, 0);

        toast.show();
    }

}

PYTHONPATH vs. sys.path

I think, that in this case using PYTHONPATH is a better thing, mostly because it doesn't introduce (questionable) unneccessary code.

After all, if you think of it, your user doesn't need that sys.path thing, because your package will get installed into site-packages, because you will be using a packaging system.

If the user chooses to run from a "local copy", as you call it, then I've observed, that the usual practice is to state, that the package needs to be added to PYTHONPATH manually, if used outside the site-packages.

Check table exist or not before create it in Oracle

Any solution which relies on testing before creation can run into a 'race' condition where another process creates the table between you testing that it does not exists and creating it. - Minor point I know.

Open Sublime Text from Terminal in macOS

It works !!!! for me on MacOS Sierra 10.12.2

ln -s "/Applications/Sublime Text.app/Contents/SharedSupport/bin/subl" /usr/local/bin/subl

and find it in terminal subl

Xcode 9 Swift Language Version (SWIFT_VERSION)

I just got this after creating a new Objective-C project in Xcode 10, after I added a Core Data model file to the project.

I found two ways to fix this:

  1. The Easy Way: Open the Core Data model's File Inspector (??-1) and change the language from Swift to Objective-C

Change Core Data model language

  1. Longer and more dangerous method

The model contains a "contents" file with this line:

<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="14460.32" systemVersion="17G5019" minimumToolsVersion="Automatic" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">

In there is a sourceLanguage="Swift" entry. Change it to sourceLanguage="Objective-C" and the error goes away.

To find the "contents" file, right click on the .xcdatamodeld in Xcode and do "Show in Finder". Right-click on the actual (Finder) file and do "Show Package Contents"

Also: Changing the model's language will stop Xcode from generating managed object subclass files in Swift.

Most Useful Attributes

// on configuration sections
[ConfigurationProperty] 

// in asp.net
[NotifyParentProperty(true)]

Create SQLite database in android

Better example is here

 try {
   myDB = this.openOrCreateDatabase("DatabaseName", MODE_PRIVATE, null);

   /* Create a Table in the Database. */
   myDB.execSQL("CREATE TABLE IF NOT EXISTS "
     + TableName
     + " (Field1 VARCHAR, Field2 INT(3));");

   /* Insert data to a Table*/
   myDB.execSQL("INSERT INTO "
     + TableName
     + " (Field1, Field2)"
     + " VALUES ('Saranga', 22);");

   /*retrieve data from database */
   Cursor c = myDB.rawQuery("SELECT * FROM " + TableName , null);

   int Column1 = c.getColumnIndex("Field1");
   int Column2 = c.getColumnIndex("Field2");

   // Check if our result was valid.
   c.moveToFirst();
   if (c != null) {
    // Loop through all Results
    do {
     String Name = c.getString(Column1);
     int Age = c.getInt(Column2);
     Data =Data +Name+"/"+Age+"\n";
    }while(c.moveToNext());
   }

Count the items from a IEnumerable<T> without iterating?

The System.Linq.Enumerable.Count extension method on IEnumerable<T> has the following implementation:

ICollection<T> c = source as ICollection<TSource>;
if (c != null)
    return c.Count;

int result = 0;
using (IEnumerator<T> enumerator = source.GetEnumerator())
{
    while (enumerator.MoveNext())
        result++;
}
return result;

So it tries to cast to ICollection<T>, which has a Count property, and uses that if possible. Otherwise it iterates.

So your best bet is to use the Count() extension method on your IEnumerable<T> object, as you will get the best performance possible that way.

How to save Excel Workbook to Desktop regardless of user?

Not sure if this is still relevant, but I use this way

Public bEnableEvents As Boolean
Public bclickok As Boolean
Public booRestoreErrorChecking As Boolean   'put this at the top of the module

 Private Declare Function apiGetComputerName Lib "kernel32" Alias _
"GetComputerNameA" (ByVal lpBuffer As String, nSize As Long) As Long
Private Declare Function apiGetUserName Lib "advapi32.dll" Alias _
"GetUserNameA" (ByVal lpBuffer As String, nSize As Long) As Long

Function GetUserID() As String
' Returns the network login name
On Error Resume Next
Dim lngLen As Long, lngX As Long
Dim strUserName As String
strUserName = String$(254, 0)
lngLen = 255
lngX = apiGetUserName(strUserName, lngLen)
If lngX <> 0 Then
    GetUserID = Left$(strUserName, lngLen - 1)
Else
    GetUserID = ""
End If
Exit Function
End Function

This next bit I save file as PDF, but can change to suit

Public Sub SaveToDesktop()
Dim LoginName As String
LoginName = UCase(GetUserID)

ChDir "C:\Users\" & LoginName & "\Desktop\"
Debug.Print LoginName
ActiveSheet.ExportAsFixedFormat Type:=xlTypePDF, Filename:= _
    "C:\Users\" & LoginName & "\Desktop\MyFileName.pdf", Quality:=xlQualityStandard, _
    IncludeDocProperties:=True, IgnorePrintAreas:=False, OpenAfterPublish:= _
    True
End Sub

Copy rows from one Datatable to another DataTable?

There is better way to do this.

DataTable targetDataTable = new DataTable(); targetDataTable = changedColumnMetadata.AsEnumerable().Where(dataRow => entityName.Equals(dataRow["EntityName"])).CopyToDataTable();

Please try this and let me know in case of any issues.

Tomcat 8 is not able to handle get request with '|' in query parameters?

The parameter tomcat.util.http.parser.HttpParser.requestTargetAllow is deprecated since Tomcat 8.5: tomcat official doc.

You can use relaxedQueryChars / relaxedPathChars in the connectors definition to allow these chars: tomcat official doc.

non static method cannot be referenced from a static context

Violating the Java naming conventions (variable names and method names start with lowercase, class names start with uppercase) is contributing to your confusion.

The variable Random is only "in scope" inside the main method. It's not accessible to any methods called by main. When you return from main, the variable disappears (it's part of the stack frame).

If you want all of the methods of your class to use the same Random instance, declare a member variable:

class MyObj {
  private final Random random = new Random();
  public void compTurn() {
    while (true) {
      int a = random.nextInt(10);
      if (possibles[a] == 1) 
        break;
    }
  }
}

How do you get the current page number of a ViewPager for Android?

getCurrentItem(), doesn't actually give the right position for the first and the last page I fixed it adding this code:

public void CalcPostion() {    
    current = viewPager.getCurrentItem();

    if ((last == current) && (current != 1) && (current != 0)) {
        current = current + 1;
        viewPager.setCurrentItem(current);
    }
    if ((last == 1) && (current == 1)) {
        last = 0;
        current = 0;
    }
    display();
    last = current;
}

add class with JavaScript

There is build in forEach loop for array in ECMAScript 5th Edition.

var buttons = document.getElementsByClassName("navButton");

Array.prototype.forEach.call(buttons,function(button) { 
    button.setAttribute("class", "active");
    button.setAttribute("src", "images/arrows/top_o.png"); 
});

System not declared in scope?

You need to add:

 #include <cstdlib>

in order for the compiler to see the prototype for system().

How to get the current working directory using python 3?

Using pathlib you can get the folder in which the current file is located. __file__ is the pathname of the file from which the module was loaded. Ref: docs

import pathlib

current_dir = pathlib.Path(__file__).parent
current_file = pathlib.Path(__file__)

Doc ref: link

Counter exit code 139 when running, but gdb make it through

this error is also caused by null pointer reference. if you are using a pointer who is not initialized then it causes this error.

to check either a pointer is initialized or not you can try something like

Class *pointer = new Class();
if(pointer!=nullptr){
    pointer->myFunction();
}

C# Passing Function as Argument

public static T Runner<T>(Func<T> funcToRun)
{
    //Do stuff before running function as normal
    return funcToRun();
}

Usage:

var ReturnValue = Runner(() => GetUser(99));

Difference between == and === in JavaScript

Take a look here: http://longgoldenears.blogspot.com/2007/09/triple-equals-in-javascript.html

The 3 equal signs mean "equality without type coercion". Using the triple equals, the values must be equal in type as well.

0 == false   // true
0 === false  // false, because they are of a different type
1 == "1"     // true, automatic type conversion for value only
1 === "1"    // false, because they are of a different type
null == undefined // true
null === undefined // false
'0' == false // true
'0' === false // false

How can I use grep to find a word inside a folder?

The answer you selected is fine, and it works, but it isn't the correct way to do it, because:

grep -nr yourString* .

This actually searches the string "yourStrin" and "g" 0 or many times.

So the proper way to do it is:

grep -nr \w*yourString\w* .

This command searches the string with any character before and after on the current folder.

How do I make a dictionary with multiple keys to one value?

If you're going to be adding to this dictionary frequently you'd want to take a class based approach, something similar to @Latty's answer in this SO question 2d-dictionary-with-many-keys-that-will-return-the-same-value.

However, if you have a static dictionary, and you need only access values by multiple keys then you could just go the very simple route of using two dictionaries. One to store the alias key association and one to store your actual data:

alias = {
    'a': 'id1',
    'b': 'id1',
    'c': 'id2',
    'd': 'id2'
}

dictionary = {
    'id1': 1,
    'id2': 2
}

dictionary[alias['a']]

If you need to add to the dictionary you could write a function like this for using both dictionaries:

def add(key, id, value=None)
    if id in dictionary:
        if key in alias:
            # Do nothing
            pass
        else:
            alias[key] = id
    else:
        dictionary[id] = value
        alias[key] = id

add('e', 'id2')
add('f', 'id3', 3)

While this works, I think ultimately if you want to do something like this writing your own data structure is probably the way to go, though it could use a similar structure.

Go back button in a page

There's a few ways, this is one:

window.history.go(-1);

UITextView that expands to text using auto layout

Obj C:

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@property (nonatomic) UITextView *textView;
@end



#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

@synthesize textView;

- (void)viewDidLoad{
    [super viewDidLoad];
    [self.view setBackgroundColor:[UIColor grayColor]];
    self.textView = [[UITextView alloc] initWithFrame:CGRectMake(30,10,250,20)];
    self.textView.delegate = self;
    [self.view addSubview:self.textView];
}

- (void)didReceiveMemoryWarning{
    [super didReceiveMemoryWarning];
}

- (void)textViewDidChange:(UITextView *)txtView{
    float height = txtView.contentSize.height;
    [UITextView beginAnimations:nil context:nil];
    [UITextView setAnimationDuration:0.5];

    CGRect frame = txtView.frame;
    frame.size.height = height + 10.0; //Give it some padding
    txtView.frame = frame;
    [UITextView commitAnimations];
}

@end

ASP.NET custom error page - Server.GetLastError() is null

One important consideration that I think everybody is missing here is a load-balancing (web farm) scenario. Since the server that's executing global.asax may be different than the server that's about the execute the custom error page, stashing the exception object in Application is not reliable.

I'm still looking for a reliable solution to this problem in a web farm configuration, and/or a good explanation from MS as to why you just can't pick up the exception with Server.GetLastError on the custom error page like you can in global.asax Application_Error.

P.S. It's unsafe to store data in the Application collection without first locking it and then unlocking it.

Get Current Session Value in JavaScript?

this is how i used ->

<body  onkeypress='myFunction(event)'>

<input type='hidden' id='homepage' value='$_SESSION[homepage]'>


<script>
    function myFunction(event){var x = event.which;if(x == 13){var homepage 
    =document.getElementById('homepage').value;
    window.location.href=homepage;}else{     
    document.getElementById("h1").innerHTML = "<h1> Press <i> ENTER </i> to go back... </h1>";}}
</script>
</body>

How to efficiently use try...catch blocks in PHP

It's more readable a single try catch block. If its important identify a kind of error I recommend customize your Exceptions.

try {
  $tableAresults = $dbHandler->doSomethingWithTableA();
  $tableBresults = $dbHandler->doSomethingElseWithTableB();
} catch (TableAException $e){
  throw $e;
} catch (Exception $e) {
  throw $e;
}

regex with space and letters only?

Try this demo please: http://jsfiddle.net/sgpw2/

Thanks Jan for spaces \s rest there is some good detail in this link:

http://www.jquery4u.com/syntax/jquery-basic-regex-selector-examples/#.UHKS5UIihlI

Hope it fits your need :)

code

 $(function() {

    $("#field").bind("keyup", function(event) {
        var regex = /^[a-zA-Z\s]+$/;
        if (regex.test($("#field").val())) {
            $('.validation').html('valid');
        } else {
            $('.validation').html("FAIL regex");
        }
    });
});?

cat, grep and cut - translated to python

You need to have better understanding of the python language and its standard library to translate the expression

cat "$filename": Reads the file cat "$filename" and dumps the content to stdout

|: pipe redirects the stdout from previous command and feeds it to the stdin of the next command

grep "something": Searches the regular expressionsomething plain text data file (if specified) or in the stdin and returns the matching lines.

cut -d'"' -f2: Splits the string with the specific delimiter and indexes/splices particular fields from the resultant list

Python Equivalent

cat "$filename"  | with open("$filename",'r') as fin:        | Read the file Sequentially
                 |     for line in fin:                      |   
-----------------------------------------------------------------------------------
grep 'something' | import re                                 | The python version returns
                 | line = re.findall(r'something', line)[0]  | a list of matches. We are only
                 |                                           | interested in the zero group
-----------------------------------------------------------------------------------
cut -d'"' -f2    | line = line.split('"')[1]                 | Splits the string and selects
                 |                                           | the second field (which is
                 |                                           | index 1 in python)

Combining

import re
with open("filename") as origin_file:
    for line in origin_file:
        line = re.findall(r'something', line)
        if line:
           line = line[0].split('"')[1]
        print line

Deleting row from datatable in C#

I think the reason the OPs code does not work is because once you call Remove you are changing the Length of drr. When you call Delete you are not actually deleting the row until AcceptChanges is called. This is why if you want to use Remove you need a separate loop.

Depending on the situation or preference...

string colName = "colName";
string comparisonValue = (whatever it is).ToString();
string strFilter = (dtbl.Columns[colName].DataType == typeof(string)) ? "[" + colName + "]='" + comparisonValue + "'" : "[" + colName + "]=" + comparisonValue;
string strSort = "";

DataRow[] drows = dtbl.Select(strFilter, strSort, DataViewRowState.CurrentRows);

Above used for next two examples

foreach(DataRow drow in drows)
{
   drow.Delete();//Mark a row for deletion.
}
dtbl.AcceptChanges();

OR

foreach(DataRow drow in drows)
{
   dtbl.Rows[dtbl.Rows.IndexOf(drow)].Delete();//Mark a row for deletion.
}
dtbl.AcceptChanges();

OR

List<DataRow> listRowsToDelete = new List<DataRow>();

foreach(DataRow drow in dtbl.Rows)
{
   if(condition to delete)
   {
      listRowsToDelete.Add(drow);
   }
}

foreach(DataRow drowToDelete in listRowsToDelete)
{
   dtbl.Rows.Remove(drowToDelete);// Calling Remove is the same as calling Delete and then calling AcceptChanges
}

Note that if you call Delete() then you should call AcceptChanges() but if you call Remove() then AcceptChanges() is not necessary.

Also, here is a good link on row filter syntax.

How to check if an app is installed from a web-page on an iPhone?

I need to do something like this I ended up going with the following solution.

I have a specific website URL that will open a page with two buttons

1) Button One go to website

2) Button Two go to application (iphone / android phone / tablet) you can fall back to a default location from here if the app is not installed (like another url or an app store)

3) cookie to remember users choice

<head>
<title>Mobile Router Example </title>


<script type="text/javascript">
    function set_cookie(name,value)
    {
       // js code to write cookie
    }
    function read_cookie(name) {
       // jsCode to read cookie
    }

    function goToApp(appLocation) {
        setTimeout(function() {
            window.location = appLocation;
              //this is a fallback if the app is not installed. Could direct to an app store or a website telling user how to get app


        }, 25);
        window.location = "custom-uri://AppShouldListenForThis";
    }

    function goToWeb(webLocation) {
        window.location = webLocation;
    }

    if (readCookie('appLinkIgnoreWeb') == 'true' ) {
        goToWeb('http://somewebsite');

    }
    else if (readCookie('appLinkIgnoreApp') == 'true') {
        goToApp('http://fallbackLocation');
    }



</script>
</head>
<body>


<div class="iphone_table_padding">
<table border="0" cellspacing="0" cellpadding="0" style="width:100%;">
    <tr>
        <td class="iphone_table_leftRight">&nbsp;</td>
        <td>
            <!-- INTRO -->
            <span class="iphone_copy_intro">Check out our new app or go to website</span>
        </td>
        <td class="iphone_table_leftRight">&nbsp;</td>
    </tr>
    <tr>
        <td class="iphone_table_leftRight">&nbsp;</td>
        <td>
            <div class="iphone_btn_padding">

                <!-- GET IPHONE APP BTN -->
                <table border="0" cellspacing="0" cellpadding="0" class="iphone_btn" onclick="set_cookie('appLinkIgnoreApp',document.getElementById('chkDontShow').checked);goToApp('http://getappfallback')">
                    <tr>
                        <td class="iphone_btn_on_left">&nbsp;</td>
                        <td class="iphone_btn_on_mid">
                            <span class="iphone_copy_btn">
                                Get The Mobile Applications
                            </span>
                        </td>
                        <td class="iphone_btn_on_right">&nbsp;</td>
                    </tr>
                </table>

            </div>
        </td>
        <td class="iphone_table_leftRight">&nbsp;</td>
    </tr>
    <tr>
        <td class="iphone_table_leftRight">&nbsp;</td>
        <td>
            <div class="iphone_btn_padding">

                <table border="0" cellspacing="0" cellpadding="0" class="iphone_btn"  onclick="set_cookie('appLinkIgnoreWeb',document.getElementById('chkDontShow').checked);goToWeb('http://www.website.com')">
                    <tr>
                        <td class="iphone_btn_left">&nbsp;</td>
                        <td class="iphone_btn_mid">
                            <span class="iphone_copy_btn">
                                Visit Website.com
                            </span>
                        </td>
                        <td class="iphone_btn_right">&nbsp;</td>
                    </tr>
                </table>

            </div>
        </td>
        <td class="iphone_table_leftRight">&nbsp;</td>
    </tr>
    <tr>
        <td class="iphone_table_leftRight">&nbsp;</td>
        <td>
            <div class="iphone_chk_padding">

                <!-- CHECK BOX -->
                <table border="0" cellspacing="0" cellpadding="0">
                    <tr>
                        <td><input type="checkbox" id="chkDontShow" /></td>
                        <td>
                            <span class="iphone_copy_chk">
                                <label for="chkDontShow">&nbsp;Don&rsquo;t show this screen again.</label>
                            </span>
                        </td>
                    </tr>
                </table>

            </div>
        </td>
        <td class="iphone_table_leftRight">&nbsp;</td>
    </tr>
</table>

</div>

</body>
</html>

Programmatically generate video or animated GIF in Python?

To create a video, you could use opencv,

#load your frames
frames = ...
#create a video writer
writer = cvCreateVideoWriter(filename, -1, fps, frame_size, is_color=1)
#and write your frames in a loop if you want
cvWriteFrame(writer, frames[i])

What is &amp used for

My Source: http://htmlhelp.com/tools/validator/problems.html#amp

Another common error occurs when including a URL which contains an ampersand ("&"):

This is invalid:

a href="foo.cgi?chapter=1&section=2&copy=3&lang=en"

Explanation:

This example generates an error for "unknown entity section" because the "&" is assumed to begin an entity reference. Browsers often recover safely from this kind of error, but real problems do occur in some cases. In this example, many browsers correctly convert &copy=3 to ©=3, which may cause the link to fail. Since ⟨ is the HTML entity for the left-pointing angle bracket, some browsers also convert &lang=en to <=en. And one old browser even finds the entity §, converting &section=2 to §ion=2.

So the goal here is to avoid problems when you are trying to validate your website. So you should be replacing your ampersands with &amp; when writing a URL in your markup.

Note that replacing & with &amp; is only done when writing the URL in HTML, where "&" is a special character (along with "<" and ">"). When writing the same URL in a plain text email message or in the location bar of your browser, you would use "&" and not "&amp;". With HTML, the browser translates "&amp;" to "&" so the Web server would only see "&" and not "&amp;" in the query string of the request.

Hope this helps : )

Can I replace groups in Java regex?

You can use matcher.start() and matcher.end() methods to get the group positions. So using this positions you can easily replace any text.

How to know elastic search installed version from kibana?

If you have installed x-pack to secure elasticseach, the request should contains the valid credential details.

curl -XGET -u "elastic:passwordForElasticUser" 'localhost:9200'

Infact, if the security enabled all the subsequent requests should follow the same pattern (inline credentials should be provided).

How can I stage and commit all files, including newly added files, using a single command?

If you just want a "quick and dirty" way to stash changes on the current branch, you can use the following alias:

git config --global alias.temp '!git add -A && git commit -m "Temp"'  

After running that command, you can just type git temp to have git automatically commit all your changes to the current branch as a commit named "Temp". Then, you can use git reset HEAD~ later to "uncommit" the changes so you can continue working on them, or git commit --amend to add more changes to the commit and/or give it a proper name.

How to set width of a div in percent in JavaScript?

I always do it like this:

$("#id").css("width", "50%");

must appear in the GROUP BY clause or be used in an aggregate function

Yes, this is a common aggregation problem. Before SQL3 (1999), the selected fields must appear in the GROUP BY clause[*].

To workaround this issue, you must calculate the aggregate in a sub-query and then join it with itself to get the additional columns you'd need to show:

SELECT m.cname, m.wmname, t.mx
FROM (
    SELECT cname, MAX(avg) AS mx
    FROM makerar
    GROUP BY cname
    ) t JOIN makerar m ON m.cname = t.cname AND t.mx = m.avg
;

 cname  | wmname |          mx           
--------+--------+------------------------
 canada | zoro   |     2.0000000000000000
 spain  | usopp  |     5.0000000000000000

But you may also use window functions, which looks simpler:

SELECT cname, wmname, MAX(avg) OVER (PARTITION BY cname) AS mx
FROM makerar
;

The only thing with this method is that it will show all records (window functions do not group). But it will show the correct (i.e. maxed at cname level) MAX for the country in each row, so it's up to you:

 cname  | wmname |          mx           
--------+--------+------------------------
 canada | zoro   |     2.0000000000000000
 spain  | luffy  |     5.0000000000000000
 spain  | usopp  |     5.0000000000000000

The solution, arguably less elegant, to show the only (cname, wmname) tuples matching the max value, is:

SELECT DISTINCT /* distinct here matters, because maybe there are various tuples for the same max value */
    m.cname, m.wmname, t.avg AS mx
FROM (
    SELECT cname, wmname, avg, ROW_NUMBER() OVER (PARTITION BY avg DESC) AS rn 
    FROM makerar
) t JOIN makerar m ON m.cname = t.cname AND m.wmname = t.wmname AND t.rn = 1
;


 cname  | wmname |          mx           
--------+--------+------------------------
 canada | zoro   |     2.0000000000000000
 spain  | usopp  |     5.0000000000000000

[*]: Interestingly enough, even though the spec sort of allows to select non-grouped fields, major engines seem to not really like it. Oracle and SQLServer just don't allow this at all. Mysql used to allow it by default, but now since 5.7 the administrator needs to enable this option (ONLY_FULL_GROUP_BY) manually in the server configuration for this feature to be supported...

Set time to 00:00:00

Another simple way,

final Calendar today = Calendar.getInstance();
        today.setTime(new Date());
        today.clear(Calendar.HOUR_OF_DAY);
        today.clear(Calendar.HOUR);
        today.clear(Calendar.MINUTE);
        today.clear(Calendar.SECOND);
        today.clear(Calendar.MILLISECOND);

You have not concluded your merge (MERGE_HEAD exists)

This worked for me:

git log
`git reset --hard <089810b5be5e907ad9e3b01f>`
git pull
git status

Should I use string.isEmpty() or "".equals(string)?

You can use apache commons StringUtils isEmpty() or isNotEmpty().

How can I open an Excel file in Python?

This may help:

This creates a node that takes a 2D List (list of list items) and pushes them into the excel spreadsheet. make sure the IN[]s are present or will throw and exception.

this is a re-write of the Revit excel dynamo node for excel 2013 as the default prepackaged node kept breaking. I also have a similar read node. The excel syntax in Python is touchy.

thnx @CodingNinja - updated : )

###Export Excel - intended to replace malfunctioning excel node

import clr

clr.AddReferenceByName('Microsoft.Office.Interop.Excel, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c')
##AddReferenceGUID("{00020813-0000-0000-C000-000000000046}") ''Excel                            C:\Program Files\Microsoft Office\Office15\EXCEL.EXE 
##Need to Verify interop for version 2015 is 15 and node attachemnt for it.
from Microsoft.Office.Interop import  * ##Excel
################################Initialize FP and Sheet ID
##Same functionality as the excel node
strFileName = IN[0]             ##Filename
sheetName = IN[1]               ##Sheet
RowOffset= IN[2]                ##RowOffset
ColOffset= IN[3]                ##COL OFfset
Data=IN[4]                      ##Data
Overwrite=IN[5]                 ##Check for auto-overwtite
XLVisible = False   #IN[6]      ##XL Visible for operation or not?

RowOffset=0
if IN[2]>0:
    RowOffset=IN[2]             ##RowOffset

ColOffset=0
if IN[3]>0:
    ColOffset=IN[3]             ##COL OFfset

if IN[6]<>False:
    XLVisible = True #IN[6]     ##XL Visible for operation or not?

################################Initialize FP and Sheet ID
xlCellTypeLastCell = 11                 #####define special sells value constant
################################
xls = Excel.ApplicationClass()          ####Connect with application
xls.Visible = XLVisible                 ##VISIBLE YES/NO
xls.DisplayAlerts = False               ### ALerts

import os.path

if os.path.isfile(strFileName):
    wb = xls.Workbooks.Open(strFileName, False)     ####Open the file 
else:
    wb = xls.Workbooks.add#         ####Open the file 
    wb.SaveAs(strFileName)
wb.application.visible = XLVisible      ####Show Excel
try:
    ws = wb.Worksheets(sheetName)       ####Get the sheet in the WB base

except:
    ws = wb.sheets.add()                ####If it doesn't exist- add it. use () for object method
    ws.Name = sheetName



#################################
#lastRow for iterating rows
lastRow=ws.UsedRange.SpecialCells(xlCellTypeLastCell).Row
#lastCol for iterating columns
lastCol=ws.UsedRange.SpecialCells(xlCellTypeLastCell).Column
#######################################################################
out=[]                                  ###MESSAGE GATHERING

c=0
r=0
val=""
if Overwrite == False :                 ####Look ahead for non-empty cells to throw error
    for r, row in enumerate(Data):   ####BASE 0## EACH ROW OF DATA ENUMERATED in the 2D array #range( RowOffset, lastRow + RowOffset):
        for c, col in enumerate (row): ####BASE 0## Each colmn in each row is a cell with data ### in range(ColOffset, lastCol + ColOffset):
            if col.Value2 >"" :
                OUT= "ERROR- Cannot overwrite"
                raise ValueError("ERROR- Cannot overwrite")
##out.append(Data[0]) ##append mesage for error
############################################################################

for r, row in enumerate(Data):   ####BASE 0## EACH ROW OF DATA ENUMERATED in the 2D array #range( RowOffset, lastRow + RowOffset):
    for c, col in enumerate (row): ####BASE 0## Each colmn in each row is a cell with data ### in range(ColOffset, lastCol + ColOffset):
        ws.Cells[r+1+RowOffset,c+1+ColOffset].Value2 = col.__str__()

##run macro disbled for debugging excel macro
##xls.Application.Run("Align_data_and_Highlight_Issues")

ToggleClass animate jQuery?

You can simply use CSS transitions, see this fiddle

.on {
color:#fff;
transition:all 1s;
}

.off{
color:#000;
transition:all 1s;
}

What is DOM Event delegation?

Event delegation makes use of two often overlooked features of JavaScript events: event bubbling and the target element.When an event is triggered on an element, for example a mouse click on a button, the same event is also triggered on all of that element’s ancestors. This process is known as event bubbling; the event bubbles up from the originating element to the top of the DOM tree.

Imagine an HTML table with 10 columns and 100 rows in which you want something to happen when the user clicks on a table cell. For example, I once had to make each cell of a table of that size editable when clicked. Adding event handlers to each of the 1000 cells would be a major performance problem and, potentially, a source of browser-crashing memory leaks. Instead, using event delegation, you would add only one event handler to the table element, intercept the click event and determine which cell was clicked.

HTML5 File API read as text and binary

Note in 2018: readAsBinaryString is outdated. For use cases where previously you'd have used it, these days you'd use readAsArrayBuffer (or in some cases, readAsDataURL) instead.


readAsBinaryString says that the data must be represented as a binary string, where:

...every byte is represented by an integer in the range [0..255].

JavaScript originally didn't have a "binary" type (until ECMAScript 5's WebGL support of Typed Array* (details below) -- it has been superseded by ECMAScript 2015's ArrayBuffer) and so they went with a String with the guarantee that no character stored in the String would be outside the range 0..255. (They could have gone with an array of Numbers instead, but they didn't; perhaps large Strings are more memory-efficient than large arrays of Numbers, since Numbers are floating-point.)

If you're reading a file that's mostly text in a western script (mostly English, for instance), then that string is going to look a lot like text. If you read a file with Unicode characters in it, you should notice a difference, since JavaScript strings are UTF-16** (details below) and so some characters will have values above 255, whereas a "binary string" according to the File API spec wouldn't have any values above 255 (you'd have two individual "characters" for the two bytes of the Unicode code point).

If you're reading a file that's not text at all (an image, perhaps), you'll probably still get a very similar result between readAsText and readAsBinaryString, but with readAsBinaryString you know that there won't be any attempt to interpret multi-byte sequences as characters. You don't know that if you use readAsText, because readAsText will use an encoding determination to try to figure out what the file's encoding is and then map it to JavaScript's UTF-16 strings.

You can see the effect if you create a file and store it in something other than ASCII or UTF-8. (In Windows you can do this via Notepad; the "Save As" as an encoding drop-down with "Unicode" on it, by which looking at the data they seem to mean UTF-16; I'm sure Mac OS and *nix editors have a similar feature.) Here's a page that dumps the result of reading a file both ways:

<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-type" content="text/html;charset=UTF-8">
<title>Show File Data</title>
<style type='text/css'>
body {
    font-family: sans-serif;
}
</style>
<script type='text/javascript'>

    function loadFile() {
        var input, file, fr;

        if (typeof window.FileReader !== 'function') {
            bodyAppend("p", "The file API isn't supported on this browser yet.");
            return;
        }

        input = document.getElementById('fileinput');
        if (!input) {
            bodyAppend("p", "Um, couldn't find the fileinput element.");
        }
        else if (!input.files) {
            bodyAppend("p", "This browser doesn't seem to support the `files` property of file inputs.");
        }
        else if (!input.files[0]) {
            bodyAppend("p", "Please select a file before clicking 'Load'");
        }
        else {
            file = input.files[0];
            fr = new FileReader();
            fr.onload = receivedText;
            fr.readAsText(file);
        }

        function receivedText() {
            showResult(fr, "Text");

            fr = new FileReader();
            fr.onload = receivedBinary;
            fr.readAsBinaryString(file);
        }

        function receivedBinary() {
            showResult(fr, "Binary");
        }
    }

    function showResult(fr, label) {
        var markup, result, n, aByte, byteStr;

        markup = [];
        result = fr.result;
        for (n = 0; n < result.length; ++n) {
            aByte = result.charCodeAt(n);
            byteStr = aByte.toString(16);
            if (byteStr.length < 2) {
                byteStr = "0" + byteStr;
            }
            markup.push(byteStr);
        }
        bodyAppend("p", label + " (" + result.length + "):");
        bodyAppend("pre", markup.join(" "));
    }

    function bodyAppend(tagName, innerHTML) {
        var elm;

        elm = document.createElement(tagName);
        elm.innerHTML = innerHTML;
        document.body.appendChild(elm);
    }

</script>
</head>
<body>
<form action='#' onsubmit="return false;">
<input type='file' id='fileinput'>
<input type='button' id='btnLoad' value='Load' onclick='loadFile();'>
</form>
</body>
</html>

If I use that with a "Testing 1 2 3" file stored in UTF-16, here are the results I get:

Text (13):

54 65 73 74 69 6e 67 20 31 20 32 20 33

Binary (28):

ff fe 54 00 65 00 73 00 74 00 69 00 6e 00 67 00 20 00 31 00 20 00 32 00 20 00 33 00

As you can see, readAsText interpreted the characters and so I got 13 (the length of "Testing 1 2 3"), and readAsBinaryString didn't, and so I got 28 (the two-byte BOM plus two bytes for each character).


* XMLHttpRequest.response with responseType = "arraybuffer" is supported in HTML 5.

** "JavaScript strings are UTF-16" may seem like an odd statement; aren't they just Unicode? No, a JavaScript string is a series of UTF-16 code units; you see surrogate pairs as two individual JavaScript "characters" even though, in fact, the surrogate pair as a whole is just one character. See the link for details.

How can I run an EXE program from a Windows Service using C#?

System.Diagnostics.Process.Start("Exe Name");

Python Requests and persistent sessions

Save only required cookies and reuse them.

import os
import pickle
from urllib.parse import urljoin, urlparse

login = '[email protected]'
password = 'secret'
# Assuming two cookies are used for persistent login.
# (Find it by tracing the login process)
persistentCookieNames = ['sessionId', 'profileId']
URL = 'http://example.com'
urlData = urlparse(URL)
cookieFile = urlData.netloc + '.cookie'
signinUrl = urljoin(URL, "/signin")
with requests.Session() as session:
    try:
        with open(cookieFile, 'rb') as f:
            print("Loading cookies...")
            session.cookies.update(pickle.load(f))
    except Exception:
        # If could not load cookies from file, get the new ones by login in
        print("Login in...")
        post = session.post(
            signinUrl,
            data={
                'email': login,
                'password': password,
            }
        )
        try:
            with open(cookieFile, 'wb') as f:
                jar = requests.cookies.RequestsCookieJar()
                for cookie in session.cookies:
                    if cookie.name in persistentCookieNames:
                        jar.set_cookie(cookie)
                pickle.dump(jar, f)
        except Exception as e:
            os.remove(cookieFile)
            raise(e)
    MyPage = urljoin(URL, "/mypage")
    page = session.get(MyPage)

Interview question: Check if one string is a rotation of other string

It's very easy to write in PHP using strlen and strpos functions:

function isRotation($string1, $string2) {
    return strlen($string1) == strlen($string2) && (($string1.$string1).strpos($string2) != -1);
}

I don't know what strpos uses internally, but if it uses KMP this will be linear in time.

Uncaught TypeError: Cannot read property 'appendChild' of null

Use querySelector insted of getElementById();

var c = document.querySelector('#mainContent');
    c.appendChild(document.createElement('div'));

How to find nth occurrence of character in a string?

/* program to find nth occurence of a character */

import java.util.Scanner;

public class CharOccur1
{

    public static void main(String arg[])
    {
        Scanner scr=new Scanner(System.in);
        int position=-1,count=0;
        System.out.println("enter the string");
        String str=scr.nextLine();
        System.out.println("enter the nth occurence of the character");
        int n=Integer.parseInt(scr.next());
        int leng=str.length();
        char c[]=new char[leng];
        System.out.println("Enter the character to find");
        char key=scr.next().charAt(0);
        c=str.toCharArray();
        for(int i=0;i<c.length;i++)
        {
            if(c[i]==key)
            {
                count++;
                position=i;
                if(count==n)
                {
                    System.out.println("Character found");
                    System.out.println("the position at which the " + count + " ocurrence occurs is " + position);
                    return;
                }
            }
        }
        if(n>count)
        { 
            System.out.println("Character occurs  "+ count + " times");
            return;
        }
    }
}

Is it possible to set async:false to $.getJSON call

I don't think you can set that option there. You will have to use jQuery.ajax() with the appropriate parameters (basically getJSON just wraps that call into an easier API, as well).

How to add a changed file to an older (not last) commit in Git

To "fix" an old commit with a small change, without changing the commit message of the old commit, where OLDCOMMIT is something like 091b73a:

git add <my fixed files>
git commit --fixup=OLDCOMMIT
git rebase --interactive --autosquash OLDCOMMIT^

You can also use git commit --squash=OLDCOMMIT to edit the old commit message during rebase.

See documentation for git commit and git rebase. As always, when rewriting git history, you should only fixup or squash commits you have not yet published to anyone else (including random internet users and build servers).


Detailed explanation

  • git commit --fixup=OLDCOMMIT copies the OLDCOMMIT commit message and automatically prefixes fixup! so it can be put in the correct order during interactive rebase. (--squash=OLDCOMMIT does the same but prefixes squash!.)
  • git rebase --interactive will bring up a text editor (which can be configured) to confirm (or edit) the rebase instruction sequence. There is info for rebase instruction changes in the file; just save and quit the editor (:wq in vim) to continue with the rebase.
  • --autosquash will automatically put any --fixup=OLDCOMMIT commits in the correct order. Note that --autosquash is only valid when the --interactive option is used.
  • The ^ in OLDCOMMIT^ means it's a reference to the commit just before OLDCOMMIT. (OLDCOMMIT^ is the first parent of OLDCOMMIT.)

Optional automation

The above steps are good for verification and/or modifying the rebase instruction sequence, but it's also possible to skip/automate the interactive rebase text editor by:

How to create full compressed tar file using Python?

In addition to @Aleksandr Tukallo's answer, you could also obtain the output and error message (if occurs). Compressing a folder using tar is explained pretty well on the following answer.

import traceback
import subprocess

try:
    cmd = ['tar', 'czfj', output_filename, file_to_archive]
    output = subprocess.check_output(cmd).decode("utf-8").strip() 
    print(output)          
except Exception:       
    print(f"E: {traceback.format_exc()}")       

Select from one table where not in another

You can LEFT JOIN the two tables. If there is no corresponding row in the second table, the values will be NULL.

SELECT id FROM partmaster LEFT JOIN product_details ON (...) WHERE product_details.part_num IS NULL

How to send a POST request using volley with string body?

I created a function for a Volley Request. You just need to pass the arguments :

public void callvolly(final String username, final String password){
    RequestQueue MyRequestQueue = Volley.newRequestQueue(this);
    String url = "http://your_url.com/abc.php"; // <----enter your post url here
    StringRequest MyStringRequest = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            //This code is executed if the server responds, whether or not the response contains data.
            //The String 'response' contains the server's response.
        }
    }, new Response.ErrorListener() { //Create an error listener to handle errors appropriately.
        @Override
        public void onErrorResponse(VolleyError error) {
            //This code is executed if there is an error.
        }
    }) {
        protected Map<String, String> getParams() {
            Map<String, String> MyData = new HashMap<String, String>();
            MyData.put("username", username);             
            MyData.put("password", password);                
            return MyData;
        }
    };


    MyRequestQueue.add(MyStringRequest);
}

How do I format a string using a dictionary in python-3.x?

To unpack a dictionary into keyword arguments, use **. Also,, new-style formatting supports referring to attributes of objects and items of mappings:

'{0[latitude]} {0[longitude]}'.format(geopoint)
'The title is {0.title}s'.format(a) # the a from your first example

How do I tell Python to convert integers into words

And here comes my solution :) It is various of earlier solutions, but developed on my own - maybe somebody enjoy it more then other propositions.

TENS = {30: 'thirty', 40: 'forty', 50: 'fifty', 60: 'sixty', 70: 'seventy', 80: 'eighty', 90: 'ninety'}
ZERO_TO_TWENTY = (
    'zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine', 'ten',
    'eleven', 'twelve', 'thirteen', 'fourteen', 'fifteen', 'sixteen', 'seventeen', 'eighteen', 'nineteen', 'twenty'
)

def number_to_english(n):
    if any(not x.isdigit() for x in str(n)):
        return ''

    if n <= 20:
        return ZERO_TO_TWENTY[n]
    elif n < 100 and n % 10 == 0:
        return TENS[n]
    elif n < 100:
        return number_to_english(n - (n % 10)) + ' ' + number_to_english(n % 10)
    elif n < 1000 and n % 100 == 0:
        return number_to_english(n / 100) + ' hundred'
    elif n < 1000:
        return number_to_english(n / 100) + ' hundred ' + number_to_english(n % 100)
    elif n < 1000000:
        return number_to_english(n / 1000) + ' thousand ' + number_to_english(n % 1000)

    return ''

It is recoursive solution and can be easily expand for bigger numbers

What is the non-jQuery equivalent of '$(document).ready()'?

According to http://youmightnotneedjquery.com/#ready a nice replacement that still works with IE8 is

_x000D_
_x000D_
function ready(fn) {_x000D_
  if (document.readyState != 'loading') {_x000D_
    fn();_x000D_
  } else if (document.addEventListener) {_x000D_
    document.addEventListener('DOMContentLoaded', fn);_x000D_
  } else {_x000D_
    document.attachEvent('onreadystatechange', function() {_x000D_
      if (document.readyState != 'loading')_x000D_
        fn();_x000D_
    });_x000D_
  }_x000D_
}_x000D_
_x000D_
// test_x000D_
window.ready(function() {_x000D_
    alert('it works');_x000D_
});
_x000D_
_x000D_
_x000D_

improvements: Personally I would also check if the type of fn is a function. And as @elliottregan suggested remove the event listener after use.

The reason I answer this question late is because I was searching for this answer but could not find it here. And I think this is the best solution.

Time complexity of Euclid's Algorithm

At every step, there are two cases

b >= a / 2, then a, b = b, a % b will make b at most half of its previous value

b < a / 2, then a, b = b, a % b will make a at most half of its previous value, since b is less than a / 2

So at every step, the algorithm will reduce at least one number to at least half less.

In at most O(log a)+O(log b) step, this will be reduced to the simple cases. Which yield an O(log n) algorithm, where n is the upper limit of a and b.

I have found it here

Is there a way to only install the mysql client (Linux)?

sudo apt-get install mysql-client-core-5.5

Hibernate: best practice to pull all lazy collections

When having to fetch multiple collections, you need to:

  1. JOIN FETCH one collection
  2. Use the Hibernate.initialize for the remaining collections.

So, in your case, you need a first JPQL query like this one:

MyEntity entity = session.createQuery("select e from MyEntity e join fetch e.addreses where e.id 
= :id", MyEntity.class)
.setParameter("id", entityId)
.getSingleResult();

Hibernate.initialize(entity.persons);

This way, you can achieve your goal with 2 SQL queries and avoid a Cartesian Product.

How to enable PHP short tags?

 short_open_tag = On

in php.ini And restart your Apache Server.

_DEBUG vs NDEBUG

Be consistent and it doesn't matter which one. Also if for some reason you must interop with another program or tool using a certain DEBUG identifier it's easy to do

#ifdef THEIRDEBUG
#define MYDEBUG
#endif //and vice-versa

Install Node.js on Ubuntu

Here is the full description to create the first program using the express generator,

Ubuntu's package manager

To install Node.js and npm via apt-get, run these commands:

sudo apt-get update
sudo apt-get install nodejs
sudo ln -s /usr/bin/nodejs /usr/bin/node
sudo apt-get install npm

Express application generator:

$ npm install express-generator -g

Display the command options with the -h option:

$ express -h

  Usage: express [options] [dir]

  Options:

    -h, --help          output usage information
    -V, --version       output the version number
    -e, --ejs           add ejs engine support (defaults to jade)
        --hbs           add handlebars engine support
    -H, --hogan         add hogan.js engine support
    -c, --css <engine>  add stylesheet <engine> support (less|stylus|compass|sass) (defaults to plain css)
        --git           add .gitignore
    -f, --force         force on non-empty directory

For example, the following creates an Express application named myapp in the current working directory:

$ express myapp

   create : myapp
   create : myapp/package.json
   create : myapp/app.js
   create : myapp/public
   create : myapp/public/javascripts
   create : myapp/public/images
   create : myapp/routes
   create : myapp/routes/index.js
   create : myapp/routes/users.js
   create : myapp/public/stylesheets
   create : myapp/public/stylesheets/style.css
   create : myapp/views
   create : myapp/views/index.jade
   create : myapp/views/layout.jade
   create : myapp/views/error.jade
   create : myapp/bin
   create : myapp/bin/www

Then install dependencies:

$ cd myapp
$ npm install

Run the app with this command:

$ DEBUG=myapp:* npm start

Then load http://localhost:3000/ in your browser to access the application.

The generated application has the following directory structure:

+-- app.js
+-- bin
¦   +-- www
+-- package.json
+-- public
¦   +-- images
¦   +-- javascripts
¦   +-- stylesheets
¦       +-- style.css
+-- routes
¦   +-- index.js
¦   +-- users.js
+-- views
    +-- error.jade
    +-- index.jade
    +-- layout.jade

7 directories, 9 files

How to check if a column exists in Pandas

Just to suggest another way without using if statements, you can use the get() method for DataFrames. For performing the sum based on the question:

df['sum'] = df.get('A', df['B']) + df['C']

The DataFrame get method has similar behavior as python dictionaries.

Possible cases for Javascript error: "Expected identifier, string or number"

I too had come across this issue. I found below two solutions. 1). Same as mentioned by others above, remove extra comma from JSON object. 2). Also, My JSP/HTML was having . Because of this it was triggering browser's old mode which was giving JS error for extra comma. When used it triggers browser's HTML5 mode(If supported) and it works fine even with Extra Comma just like any other browsers FF, Chrome etc.

Inner join vs Where

If the query optimizer is doing its job right, there should be no difference between those queries. They are just two ways to specify the same desired result.

Where do I call the BatchNormalization function in Keras?

Keras now supports the use_bias=False option, so we can save some computation by writing like

model.add(Dense(64, use_bias=False))
model.add(BatchNormalization(axis=bn_axis))
model.add(Activation('tanh'))

or

model.add(Convolution2D(64, 3, 3, use_bias=False))
model.add(BatchNormalization(axis=bn_axis))
model.add(Activation('relu'))

Array initialization syntax when not in a declaration

I can't answer the why part.

But if you want something dynamic then why don't you consider Collection ArrayList.

ArrrayList can be of any Object type.

And if as an compulsion you want it as an array you can use the toArray() method on it.

For example:

            ArrayList<String> al = new ArrayList<String>();
            al.add("one");
            al.add("two");
            String[] strArray = (String[]) al.toArray(new String[0]);

I hope this might help you.

How to change btn color in Bootstrap

Adding a step-by-step guide to @Codeply-er's answer above for SASS/SCSS newbies like me.

  1. Save btnCustom.scss.
/* import the necessary Bootstrap files */
@import 'bootstrap';

/* Define color */
$mynewcolor:#77cccc;

.btn-custom {
    @include button-variant($mynewcolor, darken($mynewcolor, 7.5%), darken($mynewcolor, 10%), lighten($mynewcolor,5%), lighten($mynewcolor, 10%), darken($mynewcolor,30%));
}

.btn-outline-custom {
    @include button-outline-variant($mynewcolor, #222222, lighten($mynewcolor,5%), $mynewcolor);
}
  1. Download a SASS compiler such as Koala so that SCSS file above can be compiled to CSS.
  2. Clone the Bootstrap github repo because the compiler needs the button-variant mixins somewhere.
  3. Explicitly import bootstrap functions by creating a _bootstrap.scss file as below. This will allow the compiler to access the Bootstrap functions and variables.
@import "bootstrap/scss/functions";
@import "bootstrap/scss/variables";
@import "bootstrap/scss/mixins";
@import "bootstrap/scss/root";
@import "bootstrap/scss/reboot";
@import "bootstrap/scss/type";
@import "bootstrap/scss/images";
@import "bootstrap/scss/grid";
@import "bootstrap/scss/tables";
@import "bootstrap/scss/forms";
@import "bootstrap/scss/buttons";
@import "bootstrap/scss/utilities";
  1. Compile btnCustom.scss with the previously downloaded compiler to css.

How to fix: "No suitable driver found for jdbc:mysql://localhost/dbname" error when using pools?

if you are using netbeans you must add Mysql JDBC driver in the library list of the project, in the properties of your project

How to use confirm using sweet alert?

inside your save button click add this code :

$("#btnSave").click(function (e) {
  e.preventDefault();
  swal("Are you sure?", {
    buttons: {
      yes: {
        text: "Yes",
        value: "yes"
      },
      no: {
        text: "No",
        value: "no"
      }
    }
  }).then((value) => {
    if (value === "yes") {
      // Add Your Custom Code for CRUD
    }
    return false;
  });
});

force Maven to copy dependencies into target/lib

Take a look at the Maven dependency plugin, specifically, the dependency:copy-dependencies goal. Take a look at the example under the heading The dependency:copy-dependencies mojo. Set the outputDirectory configuration property to ${basedir}/target/lib (I believe, you'll have to test).

Hope this helps.

How to create helper file full of functions in react native?

If you want to use class, you can do this.

Helper.js

  function x(){}

  function y(){}

  export default class Helper{

    static x(){ x(); }

    static y(){ y(); }

  }

App.js

import Helper from 'helper.js';

/****/

Helper.x

How do I convert between ISO-8859-1 and UTF-8 in Java?

Which worked for me: ("üzüm baglari" is the correct written in Turkish)

Convert ISO-8859-1 to UTF-8:

String encodedWithISO88591 = "üzüm baÄları";
String decodedToUTF8 = new String(encodedWithISO88591.getBytes("ISO-8859-1"), "UTF-8");
//Result, decodedToUTF8 --> "üzüm baglari"

Convert UTF-8 to ISO-8859-1

String encodedWithUTF8 = "üzüm baglari";
String decodedToISO88591 = new String(encodedWithUTF8.getBytes("UTF-8"), "ISO-8859-1");
//Result, decodedToISO88591 --> "üzüm baÄları"

ModuleNotFoundError: No module named 'sklearn'

I had the same issue as the author, and ran into the issue with and without Anaconda and regardless of Python version. Everyone's environment is different, but after resolving it for myself I think that in some cases it may be due to having multiple version of Python installed. Each installed Python version has its own \Lib\site-packages\ folder which can contain a unique set of modules for that Python version, and where the IDE looks into folder path that doesn't have scikit-learn in it.

One way to try solve the issue: you might clear your system of all other Python versions and their cached/temp files/system variables, and then only have one version of Python installed anywhere. Then install the dependencies Numpy and Scipy, and finally Scikit-learn.

More detailed steps:

  1. Uninstall all Python versions and their launchers (e.g. from Control Panel in Windows) except the one version you want to keep. Delete any old Python version folders in the Python directory --uninstalling doesn't remove all files.
  2. Remove other Python versions from your OS' Environment Variables (both under the system and user variables sections)
  3. Clear temporary files. For example, for Windows, delete all AppData Temp cache files (in C:\Users\YourUserName\AppData\Local\Temp). In addition, you could also do a Windows disk cleanup for other temporary files, and then reboot.
  4. If your IDE supports it, create a new virtual environment in Settings, then set your only installed Python version as the interpreter.
  5. In your IDE, install the dependencies Scipy and Numpy from the module list first, then install Scikit-Learn.

As some others have suggested, the key is making sure your environment is set up correctly where everything points to the correct library folder on your computer where the Sklearn package is located. There are a few ways this can be resolved. My approach was more drastic, but it turns out that I had a very messy Python setup on my system so I had to start fresh.

Can't create project on Netbeans 8.2

Faced same issue with jdk 10. While installing netbeans prompted for jdk default location was taken as jdk 10. This was the issue, it should be jdk8 (1.8).

  1. Close Netbeans
  2. Open below file
    C:\Program Files\NetBeans 8.2\etc\netbeans.conf
  3. Comment jdkhome line jdk9 or jdk10 with # sign:
    # netbeans_jdkhome="C:\Program Files\Java\jdk-10.0.1"
  4. Add new jdkhome line for jdk8:
    netbeans_jdkhome="C:\Program Files\Java\jdk1.8.0_171"
  5. Start Netbeans

Note: If the above .conf file is not editable, then use Administrator mode. I use Notepad++, it prompted for restarting Notepad++ in Administrator mode, then save worked fine.

Error: Argument is not a function, got undefined

There appear to be many working solutions suggesting the error has many actual causes.

In my case I hadn't declared the controller in app/index.html:

<scipt src="src/controllers/controller-name.controller.js"></script>

Error gone.

How do I clone a github project to run locally?

You clone a repository with git clone [url]. Like so,

$ git clone https://github.com/libgit2/libgit2

Javascript onclick hide div

just add onclick handler for anchor tag

onclick="this.parentNode.style.display = 'none'"

or change onclick handler for img tag

onclick="this.parentNode.parentNode.style.display = 'none'"

Trust Store vs Key Store - creating with keytool

These are the steps to create a Truststore in your local machine using Keytool. Steps to create truststore for a URL in your local machine.

1) Hit the url in the browser using chrome

2) Check for the "i" icon to the left of the url in the chrome and click it

3) Check for certificate option and click it and a Dialog box will open

4) check the "certificate path" tab for the number of certificates available to create the truststore

5) Go the "details" tab -> click"Copy to File" -> Give the path and the name for the certificate you want to create.

6) Check if it has parent certificates and follow the point "5".

7) After all the certificates are being create open Command Prompt and navigate to the path where you created the certificates.

8) provide the below Keytool command to add the certificates and create a truststore.

Sample: 
   keytool -import -alias abcdefg -file abcdefg.cer -keystore cacerts
        where "abcdefg" is the alias name and "abcdefg.cer" is the actual certificate name and "cacerts" is the truststore name

9) Provide the keytool command for all the certificates and add them to the trust store.

    keytool -list -v -keystore cacerts

Rails where condition using NOT NIL

It's not a bug in ARel, it's a bug in your logic.

What you want here is:

Foo.includes(:bar).where(Bar.arel_table[:id].not_eq(nil))

How to read response headers in angularjs?

Use the headers variable in success and error callbacks

From documentation.

$http.get('/someUrl').
  success(function(data, status, headers, config) {
    // this callback will be called asynchronously
    // when the response is available
  })
  .error(function(data, status, headers, config) {
    // called asynchronously if an error occurs
    // or server returns response with an error status.
  });

If you are on the same domain, you should be able to retrieve the response headers back. If cross-domain, you will need to add Access-Control-Expose-Headers header on the server.

Access-Control-Expose-Headers: content-type, cache, ...

How to run a .awk file?

If you put #!/bin/awk -f on the first line of your AWK script it is easier. Plus editors like Vim and ... will recognize the file as an AWK script and you can colorize. :)

#!/bin/awk -f
BEGIN {}  # Begin section
{}        # Loop section
END{}     # End section

Change the file to be executable by running:

chmod ugo+x ./awk-script

and you can then call your AWK script like this:

`$ echo "something" | ./awk-script`

How to append a jQuery variable value inside the .html tag

See this Link

HTML

<div id="products"></div>

JS

var someone = {
"name":"Mahmoude Elghandour",
"price":"174 SR",
"desc":"WE Will BE WITH YOU"
 };
 var name = $("<div/>",{"text":someone.name,"class":"name"
});

var price = $("<div/>",{"text":someone.price,"class":"price"});
var desc = $("<div />", {   
"text": someone.desc,
"class": "desc"
});
$("#products").fadeIn(1500);
$("#products").append(name).append(price).append(desc);

Node.js res.setHeader('content-type', 'text/javascript'); pushing the response javascript as file download

Use application/javascript as content type instead of text/javascript

text/javascript is mentioned obsolete. See reference docs.

http://www.iana.org/assignments/media-types/application

Also see this question on SO.

UPDATE:

I have tried executing the code you have given and the below didn't work.

res.setHeader('content-type', 'text/javascript');
res.send(JS_Script);

This is what worked for me.

res.setHeader('content-type', 'text/javascript');
res.end(JS_Script);

As robertklep has suggested, please refer to the node http docs, there is no response.send() there.

Angularjs ng-model doesn't work inside ng-if

We had this in many other cases, what we decided internally is to always have a wrapper for the controller/directive so that we don't need to think about it. Here is you example with our wrapper.

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.0rc1/angular.min.js"></script>

<script>
    function main($scope) {
        $scope.thisScope = $scope;
        $scope.testa = false;
        $scope.testb = false;
        $scope.testc = false;
        $scope.testd = false;
    }
</script>

<div ng-app >
    <div ng-controller="main">

        Test A: {{testa}}<br />
        Test B: {{testb}}<br />
        Test C: {{testc}}<br />
        Test D: {{testd}}<br />

        <div>
            testa (without ng-if): <input type="checkbox" ng-model="thisScope.testa" />
        </div>
        <div ng-if="!testa">
            testb (with ng-if): <input type="checkbox" ng-model="thisScope.testb" />
        </div>
        <div ng-show="!testa">
            testc (with ng-show): <input type="checkbox" ng-model="thisScope.testc" />
        </div>
        <div ng-hide="testa">
            testd (with ng-hide): <input type="checkbox" ng-model="thisScope.testd" />
        </div>

    </div>
</div>

Hopes this helps, Yishay

how to add a day to a date using jquery datepicker

The datepicker('setDate') sets the date in the datepicket not in the input.

You should add the date and set it in the input.

var date2 = $('.pickupDate').datepicker('getDate');
var nextDayDate = new Date();
nextDayDate.setDate(date2.getDate() + 1);
$('input').val(nextDayDate);

How to redirect user's browser URL to a different page in Nodejs?

If you are using Express, the cleanest complete answer is this

const express = require('express')
const app     = express()

app.get('*', (req, res) => {
  // REDIRECT goes here
  res.redirect('https://www.YOUR_URL.com/')
})

app.set('port', (process.env.PORT || 3000))
const server = app.listen(app.get('port'), () => {})

Sending JSON to PHP using ajax

You are tryng to send js array with js object format.

Instead of use

var a = new array();
a['something']=...

try:

var a = new Object();
a.something = ...

Pass in an array of Deferreds to $.when()

I had a case very similar where I was posting in an each loop and then setting the html markup in some fields from numbers received from the ajax. I then needed to do a sum of the (now-updated) values of these fields and place in a total field.

Thus the problem was that I was trying to do a sum on all of the numbers but no data had arrived back yet from the async ajax calls. I needed to complete this functionality in a few functions to be able to reuse the code. My outer function awaits the data before I then go and do some stuff with the fully updated DOM.

    // 1st
    function Outer() {
        var deferreds = GetAllData();

        $.when.apply($, deferreds).done(function () {
            // now you can do whatever you want with the updated page
        });
    }

    // 2nd
    function GetAllData() {
        var deferreds = [];
        $('.calculatedField').each(function (data) {
            deferreds.push(GetIndividualData($(this)));
        });
        return deferreds;
    }

    // 3rd
    function GetIndividualData(item) {
        var def = new $.Deferred();
        $.post('@Url.Action("GetData")', function (data) {
            item.html(data.valueFromAjax);
            def.resolve(data);
        });
        return def;
    }

getting "No column was specified for column 2 of 'd'" in sql server cte?

Quite an intuitive error message - just need to give the columns in d names

Change to either this

d as 
 (
  select                 
     [duration] = month(clothdeliverydate),                 
     [bkdqty] = SUM(CONVERT(INT, deliveredqty))             
  FROM                 
     barcodetable            
  where                 
     month(clothdeliverydate) is not null                
  group by month(clothdeliverydate)           
 ) 

Or you can explicitly declare the fields in the definition of the cte:

d ([duration], [bkdqty]) as 
 (
  select                 
     month(clothdeliverydate),                 
     SUM(CONVERT(INT, deliveredqty))             
  FROM                 
     barcodetable            
  where                 
     month(clothdeliverydate) is not null                
  group by month(clothdeliverydate)           
 ) 

Remove char at specific index - python

as a sidenote, replace doesn't have to move all zeros. If you just want to remove the first specify count to 1:

'asd0asd0'.replace('0','',1)

Out:

'asdasd0'

Calculating percentile of dataset column

Using {dplyr}:

library(dplyr)

# percentiles
infert %>% 
  mutate(PCT = ntile(age, 100))

# quartiles
infert %>% 
  mutate(PCT = ntile(age, 4))

# deciles
infert %>% 
  mutate(PCT = ntile(age, 10))

How to embed a video into GitHub README.md?

I combine Alexandre Jasmin and Gab Le Roux answers like this:

[![Demo CountPages alpha](https://share.gifyoutube.com/KzB6Gb.gif)](https://www.youtube.com/watch?v=ek1j272iAmc)

Demo:

Demo CountPages alpha

You can see this demo on github.

I used gifyoutube here, but I recommend using a local gif converter (like ffmpeg, see how) instead of an online one.

To record your screen to gif directly, you may want to check ScreenToGif.

Adding a SVN repository in Eclipse

It is probably of little help to you, but I enter that URL into Subclipse and the repository adds fine and I can browse and Show History on it.

Do you perhaps need to configure a proxy? You have to configure that in the Subversion runtime configuration area as Subclipse uses the Subversion libraries to connect to the server.

Hibernate Error: org.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session

This can happen when you have used same session object for read & write. How? Say you have created one session. You read a record from employee table with primary key Emp_id=101 Now You have modified the record in Java. And you are going to save the Employee record in database. we have not closed session anywhere here. As the object that was read also persist in the session. It conflicts with the object that we wish to write. Hence this error comes.

How to use jQuery in chrome extension?

And it works fine, but I am having the concern whether the scripts added to be executed in this manner are being executed asynchronously. If yes then it can happen that work.js runs even before jQuery (or other libraries which I may add in future).

That shouldn't really be a concern: you queue up scripts to be executed in a certain JS context, and that context can't have a race condition as it's single-threaded.

However, the proper way to eliminate this concern is to chain the calls:

chrome.browserAction.onClicked.addListener(function (tab) {
    chrome.tabs.executeScript({
        file: 'thirdParty/jquery-2.0.3.js'
    }, function() {
        // Guaranteed to execute only after the previous script returns
        chrome.tabs.executeScript({
            file: 'work.js'
        });
    });
});

Or, generalized:

function injectScripts(scripts, callback) {
  if(scripts.length) {
    var script = scripts.shift();
    chrome.tabs.executeScript({file: script}, function() {
      if(chrome.runtime.lastError && typeof callback === "function") {
        callback(false); // Injection failed
      }
      injectScripts(scripts, callback);
    });
  } else {
    if(typeof callback === "function") {
      callback(true);
    }
  }
}

injectScripts(["thirdParty/jquery-2.0.3.js", "work.js"], doSomethingElse);

Or, promisified (and brought more in line with the proper signature):

function injectScript(tabId, injectDetails) {
  return new Promise((resolve, reject) => {
    chrome.tabs.executeScript(tabId, injectDetails, (data) => {
      if (chrome.runtime.lastError) {
        reject(chrome.runtime.lastError.message);
      } else {
        resolve(data);
      }
    });
  });
}

injectScript(null, {file: "thirdParty/jquery-2.0.3.js"}).then(
  () => injectScript(null, {file: "work.js"})
).then(
  () => doSomethingElse
).catch(
  (error) => console.error(error)
);

Or, why the heck not, async/await-ed for even clearer syntax:

function injectScript(tabId, injectDetails) {
  return new Promise((resolve, reject) => {
    chrome.tabs.executeScript(tabId, injectDetails, (data) => {
      if (chrome.runtime.lastError) {
        reject(chrome.runtime.lastError.message);
      } else {
        resolve(data);
      }
    });
  });
}

try {
  await injectScript(null, {file: "thirdParty/jquery-2.0.3.js"});
  await injectScript(null, {file: "work.js"});
  doSomethingElse();
} catch (err) {
  console.error(err);
}

Note, in Firefox you can just use browser.tabs.executeScript as it will return a Promise.

Debugging Stored Procedure in SQL Server 2008

Yes you can (provided you have at least the professional version of visual studio), although it requires a little setting up once you've done this it's not much different from debugging code. MSDN has a basic walkthrough.

How to send custom headers with requests in Swagger UI?

Golang/go-swagger example: https://github.com/go-swagger/go-swagger/issues/1416

// swagger:parameters opid
type XRequestIdHeader struct {
    // in: header
    // required: true
    XRequestId string `json:"X-Request-Id"`
}

...
    // swagger:operation POST /endpoint/ opid
    // Parameters:
    // - $ref: #/parameters/XRequestIDHeader

Get all unique values in a JavaScript array (remove duplicates)

I have a solution that uses es6 reduce and find array helper methods to remove duplicates.

_x000D_
_x000D_
let numbers = [2, 2, 3, 3, 5, 6, 6];_x000D_
_x000D_
const removeDups = array => {_x000D_
  return array.reduce((acc, inc) => {_x000D_
    if (!acc.find(i => i === inc)) {_x000D_
      acc.push(inc);_x000D_
    }_x000D_
    return acc;_x000D_
  }, []);_x000D_
}_x000D_
_x000D_
console.log(removeDups(numbers)); /// [2,3,5,6]
_x000D_
_x000D_
_x000D_

How to increase the max upload file size in ASP.NET?

You can write that block of code in your application web.config file.

<httpRuntime maxRequestLength="2048576000" />
<sessionState timeout="3600"  />

By writing that code you can upload a larger file than now

How to retrieve a module's path?

import a_module
print(a_module.__file__)

Will actually give you the path to the .pyc file that was loaded, at least on Mac OS X. So I guess you can do:

import os
path = os.path.abspath(a_module.__file__)

You can also try:

path = os.path.dirname(a_module.__file__)

To get the module's directory.

what is the difference between $_SERVER['REQUEST_URI'] and $_GET['q']?

In the context of Drupal, the difference will depend whether clean URLs are on or not.

With them off, $_SERVER['REQUEST_URI'] will have the full path of the page as called w/ /index.php, while $_GET["q"] will just have what is assigned to q.

With them on, they will be nearly identical w/o other arguments, but $_GET["q"] will be missing the leading /. Take a look towards the end of the default .htaccess to see what is going on. They will also differ if additional arguments are passed into the page, eg when a pager is active.

How to print a specific row of a pandas DataFrame?

If you want to display at row=159220

row=159220

#To display in a table format
display(res.loc[row:row])
display(res.iloc[row:row+1])

#To display in print format
display(res.loc[row])
display(res.iloc[row])

Get records with max value for each group of grouped SQL results

Not sure if MySQL has row_number function. If so you can use it to get the desired result. On SQL Server you can do something similar to:

CREATE TABLE p
(
 person NVARCHAR(10),
 gp INT,
 age INT
);
GO
INSERT  INTO p
VALUES  ('Bob', 1, 32);
INSERT  INTO p
VALUES  ('Jill', 1, 34);
INSERT  INTO p
VALUES  ('Shawn', 1, 42);
INSERT  INTO p
VALUES  ('Jake', 2, 29);
INSERT  INTO p
VALUES  ('Paul', 2, 36);
INSERT  INTO p
VALUES  ('Laura', 2, 39);
GO

SELECT  t.person, t.gp, t.age
FROM    (
         SELECT *,
                ROW_NUMBER() OVER (PARTITION BY gp ORDER BY age DESC) row
         FROM   p
        ) t
WHERE   t.row = 1;

Get Selected value from Multi-Value Select Boxes by jquery-select2?

Simply :

$(".leaderMultiSelctdropdown").val()

Open a URL in a new tab (and not a new window)

JQuery

$('<a />',{'href': url, 'target': '_blank'}).get(0).click();

JS

Object.assign(document.createElement('a'), { target: '_blank', href: 'URL_HERE'}).click();

Vue.JS: How to call function after page loaded?

If you need run code after 100% loaded with image and files, test this in mounted():

document.onreadystatechange = () => {
  if (document.readyState == "complete") {
    console.log('Page completed with image and files!')
    // fetch to next page or some code
  }
}

More info: MDN Api onreadystatechange

How to "crop" a rectangular image into a square with CSS?

I actually came across this same problem recently and ended up with a slightly different approach (I wasn't able to use background images). It does require a tiny bit of jQuery though to determine the orientation of the images (I' sure you could use plain JS instead though).

I wrote a blog post about it if you are interested in more explaination but the code is pretty simple:

HTML:

<ul class="cropped-images">
  <li><img src="http://fredparke.com/sites/default/files/cat-portrait.jpg" /></li>
  <li><img src="http://fredparke.com/sites/default/files/cat-landscape.jpg" /></li>
</ul>

CSS:

li {
  width: 150px; // Or whatever you want.
  height: 150px; // Or whatever you want.
  overflow: hidden;
  margin: 10px;
  display: inline-block;
  vertical-align: top;
}
li img {
  max-width: 100%;
  height: auto;
  width: auto;
}
li img.landscape {
  max-width: none;
  max-height: 100%;
}

jQuery:

$( document ).ready(function() {

    $('.cropped-images img').each(function() {
      if ($(this).width() > $(this).height()) {
        $(this).addClass('landscape');        
      }
    });

});

Using $window or $location to Redirect in AngularJS

It seems that for full page reload $window.location.href is the preferred way.

It does not cause a full page reload when the browser URL is changed. To reload the page after changing the URL, use the lower-level API, $window.location.href.

https://docs.angularjs.org/guide/$location

..The underlying connection was closed: An unexpected error occurred on a receive

Before Execute query I put the statement as below and it resolved my error. Just FYI in case it will help someone.

ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072; ctx.ExecuteQuery();

Number of lines in a file in Java

I have implemented another solution to the problem, I found it more efficient in counting rows:

try
(
   FileReader       input = new FileReader("input.txt");
   LineNumberReader count = new LineNumberReader(input);
)
{
   while (count.skip(Long.MAX_VALUE) > 0)
   {
      // Loop just in case the file is > Long.MAX_VALUE or skip() decides to not read the entire file
   }

   result = count.getLineNumber() + 1;                                    // +1 because line index starts at 0
}

Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding. The statement has been terminated

If you are using ASP.NET Core with the Startup.cs convention, you can access and set the query command timeout option like this:

public void ConfigureServices(IServiceCollection services)
{
    services.AddDbContextPool<MyDbContext>(_ =>
    {
        _.UseSqlServer(Configuration.GetConnectionString("MyConnectionString"), options => 
        {
            options.CommandTimeout(180); // 3 minutes
        });
    });
}

QtCreator: No valid kits found

I had a similar problems after installing Qt in Windows.

This could be because only the Qt creator was installed and not any of the Qt libraries during initial installation. When installing from scratch use the online installer and select the following to install:

  1. For starting, select at least one version of Qt libs (ex Qt 5.15.1) and the c++ compiler of choice (ex MinGW 8.1.0 64-bit).

  2. Select Developer and Designer Tools. I kept the selected defaults.

Note: The choice of the Qt libs and Tools can also be changed post initial installation using MaintenanceTool.exe under Qt installation dir C:\Qt. See here.

How do I print the elements of a C++ vector in GDB?

With GCC 4.1.2, to print the whole of a std::vector<int> called myVector, do the following:

print *(myVector._M_impl._M_start)@myVector.size()

To print only the first N elements, do:

print *(myVector._M_impl._M_start)@N

Explanation

This is probably heavily dependent on your compiler version, but for GCC 4.1.2, the pointer to the internal array is:

myVector._M_impl._M_start 

And the GDB command to print N elements of an array starting at pointer P is:

print P@N

Or, in a short form (for a standard .gdbinit):

p P@N

How can I find the first occurrence of a sub-string in a python string?

Quick Overview: index and find

Next to the find method there is as well index. find and index both yield the same result: returning the position of the first occurrence, but if nothing is found index will raise a ValueError whereas find returns -1. Speedwise, both have the same benchmark results.

s.find(t)    #returns: -1, or index where t starts in s
s.index(t)   #returns: Same as find, but raises ValueError if t is not in s

Additional knowledge: rfind and rindex:

In general, find and index return the smallest index where the passed-in string starts, and rfind and rindex return the largest index where it starts Most of the string searching algorithms search from left to right, so functions starting with r indicate that the search happens from right to left.

So in case that the likelihood of the element you are searching is close to the end than to the start of the list, rfind or rindex would be faster.

s.rfind(t)   #returns: Same as find, but searched right to left
s.rindex(t)  #returns: Same as index, but searches right to left

Source: Python: Visual QuickStart Guide, Toby Donaldson

Changing date format in R

There are two steps here:

  • Parse the data. Your example is not fully reproducible, is the data in a file, or the variable in a text or factor variable? Let us assume the latter, then if you data.frame is called X, you can do
 X$newdate <- strptime(as.character(X$date), "%d/%m/%Y")

Now the newdate column should be of type Date.

  • Format the data. That is a matter of calling format() or strftime():
 format(X$newdate, "%Y-%m-%d")

A more complete example:

R> nzd <- data.frame(date=c("31/08/2011", "31/07/2011", "30/06/2011"), 
+                    mid=c(0.8378,0.8457,0.8147))
R> nzd
        date    mid
1 31/08/2011 0.8378
2 31/07/2011 0.8457
3 30/06/2011 0.8147
R> nzd$newdate <- strptime(as.character(nzd$date), "%d/%m/%Y")
R> nzd$txtdate <- format(nzd$newdate, "%Y-%m-%d")
R> nzd
        date    mid    newdate    txtdate
1 31/08/2011 0.8378 2011-08-31 2011-08-31
2 31/07/2011 0.8457 2011-07-31 2011-07-31
3 30/06/2011 0.8147 2011-06-30 2011-06-30
R> 

The difference between columns three and four is the type: newdate is of class Date whereas txtdate is character.

Catch error if iframe src fails to load . Error :-"Refused to display 'http://www.google.co.in/' in a frame.."

I think that you can bind the load event of the iframe, the event fires when the iframe content is fully loaded.

At the same time you can start a setTimeout, if the iFrame is loaded clear the timeout alternatively let the timeout fire.

Code:

var iframeError;

function change() {
    var url = $("#addr").val();
    $("#browse").attr("src", url);
    iframeError = setTimeout(error, 5000);
}

function load(e) {
    alert(e);
}

function error() {
    alert('error');
}

$(document).ready(function () {
    $('#browse').on('load', (function () {
        load('ok');
        clearTimeout(iframeError);
    }));

});

Demo: http://jsfiddle.net/IrvinDominin/QXc6P/

Second problem

It is because you miss the parens in the inline function call; try change this:

<iframe id="browse" style="width:100%;height:100%" onload="load" onerror="error"></iframe>

into this:

<iframe id="browse" style="width:100%;height:100%" onload="load('Done func');" onerror="error('failed function');"></iframe>

Demo: http://jsfiddle.net/IrvinDominin/ALBXR/4/

Best XML Parser for PHP

the crxml parser is a real easy to parser.

This class has got a search function, which takes a node name with any namespace as an argument. It searches the xml for the node and prints out the access statement to access that node using this class. This class also makes xml generation very easy.

you can download this class at

http://freshmeat.net/projects/crxml

or from phpclasses.org

http://www.phpclasses.org/package/6769-PHP-Manipulate-XML-documents-as-array.html

Trim a string based on the string length

// this is how you shorten the length of the string with .. // add following method to your class

private String abbreviate(String s){
  if(s.length() <= 10) return s;
  return s.substring(0, 8) + ".." ;
}

equivalent to push() or pop() for arrays?

You can use LinkedList. It has methods peek, poll and offer.

Is there a native jQuery function to switch elements?

There are a lot of edge cases to this problem, which are not handled by the accepted answer or bobince's answer. Other solutions that involve cloning are on the right track, but cloning is expensive and unnecessary. We're tempted to clone, because of the age-old problem of how to swap two variables, in which one of the steps is to assign one of the variables to a temporary variable. The assignment, (cloning), in this case is not needed. Here is a jQuery-based solution:

function swap(a, b) {
    a = $(a); b = $(b);
    var tmp = $('<span>').hide();
    a.before(tmp);
    b.before(a);
    tmp.replaceWith(b);
};

jQuery: how to find first visible input/select/textarea excluding buttons?

The JQuery code is fine. You must execute in the ready handler not in the window load event.

<script type="text/javascript">
$(function(){
  var aspForm  = $("form#aspnetForm");
  var firstInput = $(":input:not(input[type=button],input[type=submit],button):visible:first", aspForm);
  firstInput.focus();
});
</script>

Update

I tried with the example of Karim79(thanks for the example) and it works fine: http://jsfiddle.net/2sMfU/

Python Remove last char from string and return it

Strings are "immutable" for good reason: It really saves a lot of headaches, more often than you'd think. It also allows python to be very smart about optimizing their use. If you want to process your string in increments, you can pull out part of it with split() or separate it into two parts using indices:

a = "abc"
a, result = a[:-1], a[-1]

This shows that you're splitting your string in two. If you'll be examining every byte of the string, you can iterate over it (in reverse, if you wish):

for result in reversed(a):
    ...

I should add this seems a little contrived: Your string is more likely to have some separator, and then you'll use split:

ans = "foo,blah,etc."
for a in ans.split(","):
    ...

How do you get a list of the names of all files present in a directory in Node.js?

If many of the above options seem too complex or not what you are looking for here is another approach using node-dir - https://github.com/fshost/node-dir

npm install node-dir

Here is a somple function to list all .xml files searching in subdirectories

import * as nDir from 'node-dir' ;

listXMLs(rootFolderPath) {
    let xmlFiles ;

    nDir.files(rootFolderPath, function(err, items) {
        xmlFiles = items.filter(i => {
            return path.extname(i) === '.xml' ;
        }) ;
        console.log(xmlFiles) ;       
    });
}

How to call external JavaScript function in HTML

In Layman terms, you need to include external js file in your HTML file & thereafter you could directly call your JS method written in an external js file from HTML page. Follow the code snippet for insight:-

caller.html

<script type="text/javascript" src="external.js"></script>
<input type="button" onclick="letMeCallYou()" value="run external javascript">

external.js

function letMeCallYou()
{
    alert("Bazinga!!!  you called letMeCallYou")
}

Result : enter image description here

Adding default parameter value with type hint in Python

I recently saw this one-liner:

def foo(name: str, opts: dict=None) -> str:
    opts = {} if not opts else opts
    pass

Send an Array with an HTTP Get

I know this post is really old, but I have to reply because although BalusC's answer is marked as correct, it's not completely correct.

You have to write the query adding "[]" to foo like this:

foo[]=val1&foo[]=val2&foo[]=val3

Renaming Columns in an SQL SELECT Statement

select column1 as xyz,
      column2 as pqr,
.....

from TableName;

How can I set the font-family & font-size inside of a div?

Append a semicolon to the following line to fix the issue.

font-family:    Arial, Helvetica, sans-serif;

How to make an ng-click event conditional?

Basically ng-click first checks the isDisabled and based on its value it will decide whether the function should be called or not.

<span ng-click="(isDisabled) || clicked()">Do something</span>

OR read it as

<span ng-click="(if this value is true function clicked won't be called. and if it's false the clicked will be called) || clicked()">Do something</span>

How to set a value of a variable inside a template code?

The best solution for this is to write a custom assignment_tag. This solution is more clean than using a with tag because it achieves a very clear separation between logic and styling.

Start by creating a template tag file (eg. appname/templatetags/hello_world.py):

from django import template

register = template.Library()

@register.assignment_tag
def get_addressee():
    return "World"

Now you may use the get_addressee template tag in your templates:

{% load hello_world %}

{% get_addressee as addressee %}

<html>
    <body>
        <h1>hello {{addressee}}</h1>
    </body>
</html>

Modelling an elevator using Object-Oriented Analysis and Design

See:

Lu Luo, A UML Documentation for a Elevator System
Distributed Embedded Systems, Fall 2000
Ph.D. Project Report
Carneghie Mellon University

link

Using Excel as front end to Access database (with VBA)

Unless there is a strong advantage to running your user form in Excel then I would go with a 100% Access solution that would export the reports and data to Excel on an ad-hoc basis.

From what you describe, Access seems the stronger contender as it is built for working with data:
you would have a lot more tools at your disposal to solve any data problems than have to go around the limitations of Excel and shoehorn it into becoming Access...

As for your questions:

  1. Very easy. There have been some other questions on SO on that subject.
    See for instance this one and that one.

  2. Don't know, but I would guess that there could be a small penalty.
    The biggest difficulty I see is trying to get all the functionalities that Access gives you and re-creating some of these in Excel.

  3. Yes, you can have multiple Excel users and a single Access database.
    Here again, using Access as a front-end and keeping the data in a linked Access database on your network would make more sense and it's easy as pie, there's even a wizard in Access to help you do that: it's just 1 click away.

Really, as most other people have said, take a tiny bit of time to get acquainted with Access, it will save you a lot of time and trouble.
You may know Excel better but if you've gone 80% of the way already if you know VBA and are familiar with the Office object model.

Other advantages of doing it in Access: the Access 2007 runtime is free, meaning that if you were to deploy to app to 1 or 30 PC it would cost you the same: nothing.
You only need one full version of Access for your development work (the Runtime doesn't have the designers).

what is difference between success and .done() method of $.ajax

success only fires if the AJAX call is successful, i.e. ultimately returns a HTTP 200 status. error fires if it fails and complete when the request finishes, regardless of success.

In jQuery 1.8 on the jqXHR object (returned by $.ajax) success was replaced with done, error with fail and complete with always.

However you should still be able to initialise the AJAX request with the old syntax. So these do similar things:

// set success action before making the request
$.ajax({
  url: '...',
  success: function(){
    alert('AJAX successful');
  }
});

// set success action just after starting the request
var jqxhr = $.ajax( "..." )
  .done(function() { alert("success"); });

This change is for compatibility with jQuery 1.5's deferred object. Deferred (and now Promise, which has full native browser support in Chrome and FX) allow you to chain asynchronous actions:

$.ajax("parent").
    done(function(p) { return $.ajax("child/" + p.id); }).
    done(someOtherDeferredFunction).
    done(function(c) { alert("success: " + c.name); });

This chain of functions is easier to maintain than a nested pyramid of callbacks you get with success.

However, please note that done is now deprecated in favour of the Promise syntax that uses then instead:

$.ajax("parent").
    then(function(p) { return $.ajax("child/" + p.id); }).
    then(someOtherDeferredFunction).
    then(function(c) { alert("success: " + c.name); }).
    catch(function(err) { alert("error: " + err.message); });

This is worth adopting because async and await extend promises improved syntax (and error handling):

try {
    var p = await $.ajax("parent");
    var x = await $.ajax("child/" + p.id);
    var c = await someOtherDeferredFunction(x);
    alert("success: " + c.name);
}
catch(err) { 
    alert("error: " + err.message); 
}

Differences between fork and exec

They are use together to create a new child process. First, calling fork creates a copy of the current process (the child process). Then, exec is called from within the child process to "replace" the copy of the parent process with the new process.

The process goes something like this:

child = fork();  //Fork returns a PID for the parent process, or 0 for the child, or -1 for Fail

if (child < 0) {
    std::cout << "Failed to fork GUI process...Exiting" << std::endl;
    exit (-1);
} else if (child == 0) {       // This is the Child Process
    // Call one of the "exec" functions to create the child process
    execvp (argv[0], const_cast<char**>(argv));
} else {                       // This is the Parent Process
    //Continue executing parent process
}

Difference between arguments and parameters in Java

In java, there are two types of parameters, implicit parameters and explicit parameters. Explicit parameters are the arguments passed into a method. The implicit parameter of a method is the instance that the method is called from. Arguments are simply one of the two types of parameters.

How to declare a global variable in React?

Create a file named "config.js" in ./src folder with this content:

module.exports = global.config = {
    i18n: {
        welcome: {
            en: "Welcome",
            fa: "??? ?????"
        }
        // rest of your translation object
    }
    // other global config variables you wish
};

In your main file "index.js" put this line:

import './config';

Everywhere you need your object use this:

global.config.i18n.welcome.en

How to hide output of subprocess in Python 2.7

Redirect the output to DEVNULL:

import os
import subprocess

FNULL = open(os.devnull, 'w')
retcode = subprocess.call(['echo', 'foo'], 
    stdout=FNULL, 
    stderr=subprocess.STDOUT)

It is effectively the same as running this shell command:

retcode = os.system("echo 'foo' &> /dev/null")

Update: This answer applies to the original question relating to python 2.7. As of python >= 3.3 an official subprocess.DEVNULL symbol was added.

retcode = subprocess.call(['echo', 'foo'], 
    stdout=subprocess.DEVNULL, 
    stderr=subprocess.STDOUT)

Difference between & and && in Java?

& is bitwise. && is logical.

& evaluates both sides of the operation.
&& evaluates the left side of the operation, if it's true, it continues and evaluates the right side.

How connect Postgres to localhost server using pgAdmin on Ubuntu?

if you open the psql console in a terminal window, by typing

$ psql

you're super user username will be shown before the =#, for example:

elisechant=#$

That will be the user name you should use for localhost.

Is it possible to listen to a "style change" event?

I think the best answer if from Mike in the case you can't launch your event because is not from your code. But I get some errors when I used it. So I write a new answer for show you the code that I use.

Extension

// Extends functionality of ".css()"
// This could be renamed if you'd like (i.e. "$.fn.cssWithListener = func ...")
(function() {
    orig = $.fn.css;
    $.fn.css = function() {
        var result = orig.apply(this, arguments);
        $(this).trigger('stylechanged');
        return result;
    }
})();

Usage

// Add listener
$('element').on('stylechanged', function () {
    console.log('css changed');
});

// Perform change
$('element').css('background', 'red');

I got error because var ev = new $.Event('style'); Something like style was not defined in HtmlDiv.. I removed it, and I launch now $(this).trigger("stylechanged"). Another problem was that Mike didn't return the resulto of $(css, ..) then It can make problems in some cases. So I get the result and return it. Now works ^^ In every css change include from some libs that I can't modify and trigger an event.

In Objective-C, how do I test the object type?

You would probably use

- (BOOL)isKindOfClass:(Class)aClass

This is a method of NSObject.

For more info check the NSObject documentation.

This is how you use this.

BOOL test = [self isKindOfClass:[SomeClass class]];

You might also try doing somthing like this

for(id element in myArray)
{
    NSLog(@"=======================================");
    NSLog(@"Is of type: %@", [element className]);
    NSLog(@"Is of type NSString?: %@", ([[element className] isMemberOfClass:[NSString class]])? @"Yes" : @"No");
    NSLog(@"Is a kind of NSString: %@", ([[element classForCoder] isSubclassOfClass:[NSString class]])? @"Yes" : @"No");    
}

How do I set the focus to the first input element in an HTML form independent from the id?

This gets the first of any visible common input, including textareas and select boxes. This also makes sure they aren't hidden, disabled or readonly. it also allows for a target div, which I use in my software (ie, first input inside of this form).

$("input:visible:enabled:not([readonly]),textarea:visible:enabled:not([readonly]),select:visible:enabled:not([readonly])", 
    target).first().focus();

What's the difference between <b> and <strong>, <i> and <em>?

HTML Formatting Elements:

HTML also defines special elements for defining text with a special meaning. HTML uses elements like <b> and <i> for formatting output, like bold or italic text.

HTML Bold and Strong Formatting:

The HTML <b> element defines bold text, without any extra importance.

<b>This text is bold</b>

The HTML <strong> element defines strong text, with added semantic "strong" importance.

<strong>This text is strong</strong>

HTML Italic and Emphasized Formatting:

The HTML <i> element defines italic text, without any extra importance.

<i>This text is italic</i>

The HTML <em> element defines emphasized text, with added semantic importance.

<em>This text is emphasized</em>

'Best' practice for restful POST response

Returning the whole object on an update would not seem very relevant, but I can hardly see why returning the whole object when it is created would be a bad practice in a normal use case. This would be useful at least to get the ID easily and to get the timestamps when relevant. This is actually the default behavior got when scaffolding with Rails.

I really do not see any advantage to returning only the ID and doing a GET request after, to get the data you could have got with your initial POST.

Anyway as long as your API is consistent I think that you should choose the pattern that fits your needs the best. There is not any correct way of how to build a REST API, imo.

How can I remove the last character of a string in python?

Answering the question: to remove the last character, just use:string = string[:-1].

If you want to remove the last '\' if there is one (or if there is more than one):

while string[-1]=='\\':
    string = string[:-1]

If it's a path, then use the os.path functions:

dir = "dir1\\dir2\\file.jpg\\"   #I'm using windows by the way
os.path.dirname(dir)

although I would 'add' a slash in the end to prevent missing the filename in case there's no slash at the end of the original string:

dir = "dir1\\dir2\\file.jpg"
os.path.dirname(dir + "\\")

When using abspath, (if the path isn't absolute I guess,) will add the current working directory to the path.

os.path.abspath(dir)

How can I get the number of records affected by a stored procedure?

Turns out for me that SET NOCOUNT ON was set in the stored procedure script (by default on SQL Server Management Studio) and SqlCommand.ExecuteNonQuery(); always returned -1.

I just set it off: SET NOCOUNT OFF without needing to use @@ROWCOUNT.

More details found here : SqlCommand.ExecuteNonQuery() returns -1 when doing Insert / Update / Delete

What is causing ERROR: there is no unique constraint matching given keys for referenced table?

In postgresql all foreign keys must reference a unique key in the parent table, so in your bar table you must have a unique (name) index.

See also http://www.postgresql.org/docs/9.1/static/ddl-constraints.html#DDL-CONSTRAINTS-FK and specifically:

Finally, we should mention that a foreign key must reference columns that either are a primary key or form a unique constraint.

Emphasis mine.

"The given path's format is not supported."

For me the problem was an invisible to human eye "?" Left-To-Right Embedding character.
It stuck at the beginning of the string (just before the 'D'), after I copy-pasted the path, from the windows file properties security tab.

var yourJson = System.IO.File.ReadAllText(@"D:\test\json.txt"); // Works
var yourJson = System.IO.File.ReadAllText(@"?D:\test\json.txt"); // Error

So those, identical at first glance, two lines are actually different.

Android draw a Horizontal line between views

_x000D_
_x000D_
 <view
        android:id="@+id/blackLine"
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#000000"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"/>
_x000D_
_x000D_
_x000D_

app:layout_constraintStart_toStartOf="parent"/>

Get unique values from arraylist in java

I hope I understand your question correctly: assuming that the values are of type String, the most efficient way is probably to convert to a HashSet and iterate over it:

ArrayList<String> values = ... //Your values
HashSet<String> uniqueValues = new HashSet<>(values);
for (String value : uniqueValues) {
   ... //Do something
}

Chrome DevTools Devices does not detect device when plugged in

Using a Samsung Galaxy S9 running Android Pie. -- May 2019 Similar to the answer above, and NickW's post for that answer: Once your device is connected, instead of going to settings, go to the phone's notification bar > Android System and 'Tap for other USB options.' Select MIDI under the options and you're good to go!

CALL command vs. START with /WAIT option

For exe files, I suppose the differences are nearly unimportant.
But to start an exe you don't even need CALL.

When starting another batch it's a big difference,
as CALL will start it in the same window and the called batch has access to the same variable context.
So it can also change variables which affects the caller.

START will create a new cmd.exe for the called batch and without /b it will open a new window.
As it's a new context, variables can't be shared.

Differences

Using start /wait <prog>
- Changes of environment variables are lost when the <prog> ends
- The caller waits until the <prog> is finished

Using call <prog>
- For exe it can be ommited, because it's equal to just starting <prog>
- For an exe-prog the caller batch waits or starts the exe asynchronous, but the behaviour depends on the exe itself.
- For batch files, the caller batch continues, when the called <batch-file> finishes, WITHOUT call the control will not return to the caller batch

Addendum:

Using CALL can change the parameters (for batch and exe files), but only when they contain carets or percent signs.

call myProg param1 param^^2 "param^3" %%path%%

Will be expanded to (from within an batch file)

myProg param1 param2 param^^3 <content of path>

File path issues in R using Windows ("Hex digits in character string" error)

I know this is really old, but if you are copying and pasting anyway, you can just use:

read.csv(readClipboard())

readClipboard() escapes the back-slashes for you. Just remember to make sure the ".csv" is included in your copy, perhaps with this:

read.csv(paste0(readClipboard(),'.csv'))

And if you really want to minimize your typing you can use some functions:

setWD <- function(){
  setwd(readClipboard())
}


readCSV <- function(){
  return(readr::read_csv(paste0(readClipboard(),'.csv')))
} 

#copy directory path
setWD()

#copy file name
df <- readCSV()

In plain English, what does "git reset" do?

The post Reset Demystified in the blog Pro Git gives a very no-brainer explanation on git reset and git checkout.

After all the helpful discussion at the top of that post, the author reduces the rules to the following simple three steps:

That is basically it. The reset command overwrites these three trees in a specific order, stopping when you tell it to.

  1. Move whatever branch HEAD points to (stop if --soft)
  2. THEN, make the Index look like that (stop here unless --hard)
  3. THEN, make the Working Directory look like that

There are also --merge and --keep options, but I would rather keep things simpler for now - that will be for another article.

What is the difference between :focus and :active?

Using "focus" will give keyboard users the same effect that mouse users get when they hover with a mouse. "Active" is needed to get the same effect in Internet Explorer.

The reality is, these states do not work as they should for all users. Not using all three selectors creates accessibility issues for many keyboard-only users who are physically unable to use a mouse. I invite you to take the #nomouse challenge (nomouse dot org).

Padding is invalid and cannot be removed?

I had the same error. In my case it was because I have stored the encrypted data in a SQL Database. The table the data is stored in, has a binary(1000) data type. When retreiving the data from the database, it would decrypt these 1000 bytes, while there where actually 400 bytes. So removing the trailing zero's (600) from the result it fixed the problem.

Count textarea characters

textarea.addEventListener("keypress", textareaLengthCheck(textarea), false);

You are calling textareaLengthCheck and then assigning its return value to the event listener. This is why it doesn't update or do anything after loading. Try this:

textarea.addEventListener("keypress",textareaLengthCheck,false);

Aside from that:

var length = textarea.length;

textarea is the actual textarea, not the value. Try this instead:

var length = textarea.value.length;

Combined with the previous suggestion, your function should be:

function textareaLengthCheck() {
    var length = this.value.length;
    // rest of code
};

Java output formatting for Strings

System.out.println(String.format("%-20s= %s" , "label", "content" ));
  • Where %s is a placeholder for you string.
  • The '-' makes the result left-justified.
  • 20 is the width of the first string

The output looks like this:

label               = content

As a reference I recommend Javadoc on formatter syntax

Conditional replacement of values in a data.frame

The R-inferno, or the basic R-documentation will explain why using df$* is not the best approach here. From the help page for "[" :

"Indexing by [ is similar to atomic vectors and selects a list of the specified element(s). Both [[ and $ select a single element of the list. The main difference is that $ does not allow computed indices, whereas [[ does. x$name is equivalent to x[["name", exact = FALSE]]. Also, the partial matching behavior of [[ can be controlled using the exact argument. "

I recommend using the [row,col] notation instead. Example:

Rgames: foo   
         x    y z  
   [1,] 1e+00 1 0  
   [2,] 2e+00 2 0  
   [3,] 3e+00 1 0  
   [4,] 4e+00 2 0  
   [5,] 5e+00 1 0  
   [6,] 6e+00 2 0  
   [7,] 7e+00 1 0  
   [8,] 8e+00 2 0  
   [9,] 9e+00 1 0  
   [10,] 1e+01 2 0  
Rgames: foo<-as.data.frame(foo)

Rgames: foo[foo$y==2,3]<-foo[foo$y==2,1]
Rgames: foo
       x y     z
1  1e+00 1 0e+00
2  2e+00 2 2e+00
3  3e+00 1 0e+00
4  4e+00 2 4e+00
5  5e+00 1 0e+00
6  6e+00 2 6e+00
7  7e+00 1 0e+00
8  8e+00 2 8e+00
9  9e+00 1 0e+00
10 1e+01 2 1e+01

Smooth GPS data

As for least squares fit, here are a couple other things to experiment with:

  1. Just because it's least squares fit doesn't mean that it has to be linear. You can least-squares-fit a quadratic curve to the data, then this would fit a scenario in which the user is accelerating. (Note that by least squares fit I mean using the coordinates as the dependent variable and time as the independent variable.)

  2. You could also try weighting the data points based on reported accuracy. When the accuracy is low weight those data points lower.

  3. Another thing you might want to try is rather than display a single point, if the accuracy is low display a circle or something indicating the range in which the user could be based on the reported accuracy. (This is what the iPhone's built-in Google Maps application does.)

How to convert an int array to String with toString method in Java

You can use java.util.Arrays:

String res = Arrays.toString(array);
System.out.println(res);

Output:

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

How to convert a table to a data frame

This is deprecated:

as.data.frame(my_table)

Instead use this package:

library("quanteda")
convert(my_table, to="data.frame") 

How to execute an external program from within Node.js?

var exec = require('child_process').exec;
exec('pwd', function callback(error, stdout, stderr){
    // result
});

How to "git clone" including submodules?

Try this for including submodules in git repository.

git clone -b <branch_name> --recursive <remote> <directory>

or

git clone --recurse-submodules

app.config for a class library

Actually, for some rare case you could store app.config in class libraries (by adding manually) and parse it by OpenExeConfiguration.

 var fileMap =
    new ExeConfigurationFileMap {ExeConfigFilename = 
    @"C:\..somePath..\someName.config"};
 System.Configuration.Configuration config =
    ConfigurationManager.OpenMappedExeConfiguration(fileMap, 
    ConfigurationUserLevel.None);

You should really estimate the real need of this. For abstract data its not the best solution, but "Config Sections" could be very usefull!!

For example, we organised our N-Tier WCF architecture decoupled, without any metadata, simply by using Unity Container and Injection Factory based on Channel Factory T. We added externall ClassLibrary dll with just [Service Contract] Interfaces and common app.config in order to read endpoints from clientsection, and easily add/change them at one place.

How can I get screen resolution in java?

int resolution =Toolkit.getDefaultToolkit().getScreenResolution();

System.out.println(resolution);

What is the PostgreSQL equivalent for ISNULL()

Use COALESCE() instead:

SELECT COALESCE(Field,'Empty') from Table;

It functions much like ISNULL, although provides more functionality. Coalesce will return the first non null value in the list. Thus:

SELECT COALESCE(null, null, 5); 

returns 5, while

SELECT COALESCE(null, 2, 5);

returns 2

Coalesce will take a large number of arguments. There is no documented maximum. I tested it will 100 arguments and it succeeded. This should be plenty for the vast majority of situations.

Today`s date in an excel macro

Try the Date function. It will give you today's date in a MM/DD/YYYY format. If you're looking for today's date in the MM-DD-YYYY format try Date$. Now() also includes the current time (which you might not need). It all depends on what you need. :)

How can I get the browser's scrollbar sizes?

It seems to work, but maybe there is a simpler solution that works in all browsers?

_x000D_
_x000D_
// Create the measurement node_x000D_
var scrollDiv = document.createElement("div");_x000D_
scrollDiv.className = "scrollbar-measure";_x000D_
document.body.appendChild(scrollDiv);_x000D_
_x000D_
// Get the scrollbar width_x000D_
var scrollbarWidth = scrollDiv.offsetWidth - scrollDiv.clientWidth;_x000D_
console.info(scrollbarWidth); // Mac:  15_x000D_
_x000D_
// Delete the DIV _x000D_
document.body.removeChild(scrollDiv);
_x000D_
.scrollbar-measure {_x000D_
 width: 100px;_x000D_
 height: 100px;_x000D_
 overflow: scroll;_x000D_
 position: absolute;_x000D_
 top: -9999px;_x000D_
}
_x000D_
_x000D_
_x000D_

List of All Locales and Their Short Codes?

While accepted answer is pretty complete (I used myself in similar question that arised to me), I think it is worth to put the whole supported language codes and variations, as well as encodings, and point user to a file which is present in almost any linux distributions, in case he simply wants a quicker answer and no internet for example.

This is the file /usr/share/i18n/SUPPORTED and its contents:

aa_DJ.UTF-8 UTF-8
aa_DJ ISO-8859-1
aa_ER UTF-8
aa_ER@saaho UTF-8
aa_ET UTF-8
af_ZA.UTF-8 UTF-8
af_ZA ISO-8859-1
am_ET UTF-8
an_ES.UTF-8 UTF-8
an_ES ISO-8859-15
ar_AE.UTF-8 UTF-8
ar_AE ISO-8859-6
ar_BH.UTF-8 UTF-8
ar_BH ISO-8859-6
ar_DZ.UTF-8 UTF-8
ar_DZ ISO-8859-6
ar_EG.UTF-8 UTF-8
ar_EG ISO-8859-6
ar_IN UTF-8
ar_IQ.UTF-8 UTF-8
ar_IQ ISO-8859-6
ar_JO.UTF-8 UTF-8
ar_JO ISO-8859-6
ar_KW.UTF-8 UTF-8
ar_KW ISO-8859-6
ar_LB.UTF-8 UTF-8
ar_LB ISO-8859-6
ar_LY.UTF-8 UTF-8
ar_LY ISO-8859-6
ar_MA.UTF-8 UTF-8
ar_MA ISO-8859-6
ar_OM.UTF-8 UTF-8
ar_OM ISO-8859-6
ar_QA.UTF-8 UTF-8
ar_QA ISO-8859-6
ar_SA.UTF-8 UTF-8
ar_SA ISO-8859-6
ar_SD.UTF-8 UTF-8
ar_SD ISO-8859-6
ar_SY.UTF-8 UTF-8
ar_SY ISO-8859-6
ar_TN.UTF-8 UTF-8
ar_TN ISO-8859-6
ar_YE.UTF-8 UTF-8
ar_YE ISO-8859-6
az_AZ UTF-8
as_IN UTF-8
ast_ES.UTF-8 UTF-8
ast_ES ISO-8859-15
be_BY.UTF-8 UTF-8
be_BY CP1251
be_BY@latin UTF-8
bem_ZM UTF-8
ber_DZ UTF-8
ber_MA UTF-8
bg_BG.UTF-8 UTF-8
bg_BG CP1251
bho_IN UTF-8
bn_BD UTF-8
bn_IN UTF-8
bo_CN UTF-8
bo_IN UTF-8
br_FR.UTF-8 UTF-8
br_FR ISO-8859-1
br_FR@euro ISO-8859-15
brx_IN UTF-8
bs_BA.UTF-8 UTF-8
bs_BA ISO-8859-2
byn_ER UTF-8
ca_AD.UTF-8 UTF-8
ca_AD ISO-8859-15
ca_ES.UTF-8 UTF-8
ca_ES ISO-8859-1
ca_ES@euro ISO-8859-15
ca_FR.UTF-8 UTF-8
ca_FR ISO-8859-15
ca_IT.UTF-8 UTF-8
ca_IT ISO-8859-15
crh_UA UTF-8
cs_CZ.UTF-8 UTF-8
cs_CZ ISO-8859-2
csb_PL UTF-8
cv_RU UTF-8
cy_GB.UTF-8 UTF-8
cy_GB ISO-8859-14
da_DK.UTF-8 UTF-8
da_DK ISO-8859-1
de_AT.UTF-8 UTF-8
de_AT ISO-8859-1
de_AT@euro ISO-8859-15
de_BE.UTF-8 UTF-8
de_BE ISO-8859-1
de_BE@euro ISO-8859-15
de_CH.UTF-8 UTF-8
de_CH ISO-8859-1
de_DE.UTF-8 UTF-8
de_DE ISO-8859-1
de_DE@euro ISO-8859-15
de_LU.UTF-8 UTF-8
de_LU ISO-8859-1
de_LU@euro ISO-8859-15
dv_MV UTF-8
dz_BT UTF-8
el_GR.UTF-8 UTF-8
el_GR ISO-8859-7
el_CY.UTF-8 UTF-8
el_CY ISO-8859-7
en_AG UTF-8
en_AU.UTF-8 UTF-8
en_AU ISO-8859-1
en_BW.UTF-8 UTF-8
en_BW ISO-8859-1
en_CA.UTF-8 UTF-8
en_CA ISO-8859-1
en_DK.UTF-8 UTF-8
en_DK ISO-8859-1
en_GB.UTF-8 UTF-8
en_GB ISO-8859-1
en_HK.UTF-8 UTF-8
en_HK ISO-8859-1
en_IE.UTF-8 UTF-8
en_IE ISO-8859-1
en_IE@euro ISO-8859-15
en_IN UTF-8
en_NG UTF-8
en_NZ.UTF-8 UTF-8
en_NZ ISO-8859-1
en_PH.UTF-8 UTF-8
en_PH ISO-8859-1
en_SG.UTF-8 UTF-8
en_SG ISO-8859-1
en_US.UTF-8 UTF-8
en_US ISO-8859-1
en_ZA.UTF-8 UTF-8
en_ZA ISO-8859-1
en_ZM UTF-8
en_ZW.UTF-8 UTF-8
en_ZW ISO-8859-1
es_AR.UTF-8 UTF-8
es_AR ISO-8859-1
es_BO.UTF-8 UTF-8
es_BO ISO-8859-1
es_CL.UTF-8 UTF-8
es_CL ISO-8859-1
es_CO.UTF-8 UTF-8
es_CO ISO-8859-1
es_CR.UTF-8 UTF-8
es_CR ISO-8859-1
es_CU UTF-8
es_DO.UTF-8 UTF-8
es_DO ISO-8859-1
es_EC.UTF-8 UTF-8
es_EC ISO-8859-1
es_ES.UTF-8 UTF-8
es_ES ISO-8859-1
es_ES@euro ISO-8859-15
es_GT.UTF-8 UTF-8
es_GT ISO-8859-1
es_HN.UTF-8 UTF-8
es_HN ISO-8859-1
es_MX.UTF-8 UTF-8
es_MX ISO-8859-1
es_NI.UTF-8 UTF-8
es_NI ISO-8859-1
es_PA.UTF-8 UTF-8
es_PA ISO-8859-1
es_PE.UTF-8 UTF-8
es_PE ISO-8859-1
es_PR.UTF-8 UTF-8
es_PR ISO-8859-1
es_PY.UTF-8 UTF-8
es_PY ISO-8859-1
es_SV.UTF-8 UTF-8
es_SV ISO-8859-1
es_US.UTF-8 UTF-8
es_US ISO-8859-1
es_UY.UTF-8 UTF-8
es_UY ISO-8859-1
es_VE.UTF-8 UTF-8
es_VE ISO-8859-1
et_EE.UTF-8 UTF-8
et_EE ISO-8859-1
et_EE.ISO-8859-15 ISO-8859-15
eu_ES.UTF-8 UTF-8
eu_ES ISO-8859-1
eu_ES@euro ISO-8859-15
fa_IR UTF-8
ff_SN UTF-8
fi_FI.UTF-8 UTF-8
fi_FI ISO-8859-1
fi_FI@euro ISO-8859-15
fil_PH UTF-8
fo_FO.UTF-8 UTF-8
fo_FO ISO-8859-1
fr_BE.UTF-8 UTF-8
fr_BE ISO-8859-1
fr_BE@euro ISO-8859-15
fr_CA.UTF-8 UTF-8
fr_CA ISO-8859-1
fr_CH.UTF-8 UTF-8
fr_CH ISO-8859-1
fr_FR.UTF-8 UTF-8
fr_FR ISO-8859-1
fr_FR@euro ISO-8859-15
fr_LU.UTF-8 UTF-8
fr_LU ISO-8859-1
fr_LU@euro ISO-8859-15
fur_IT UTF-8
fy_NL UTF-8
fy_DE UTF-8
ga_IE.UTF-8 UTF-8
ga_IE ISO-8859-1
ga_IE@euro ISO-8859-15
gd_GB.UTF-8 UTF-8
gd_GB ISO-8859-15
gez_ER UTF-8
gez_ER@abegede UTF-8
gez_ET UTF-8
gez_ET@abegede UTF-8
gl_ES.UTF-8 UTF-8
gl_ES ISO-8859-1
gl_ES@euro ISO-8859-15
gu_IN UTF-8
gv_GB.UTF-8 UTF-8
gv_GB ISO-8859-1
ha_NG UTF-8
he_IL.UTF-8 UTF-8
he_IL ISO-8859-8
hi_IN UTF-8
hne_IN UTF-8
hr_HR.UTF-8 UTF-8
hr_HR ISO-8859-2
hsb_DE ISO-8859-2
hsb_DE.UTF-8 UTF-8
ht_HT UTF-8
hu_HU.UTF-8 UTF-8
hu_HU ISO-8859-2
hy_AM UTF-8
hy_AM.ARMSCII-8 ARMSCII-8
id_ID.UTF-8 UTF-8
id_ID ISO-8859-1
ig_NG UTF-8
ik_CA UTF-8
is_IS.UTF-8 UTF-8
is_IS ISO-8859-1
it_CH.UTF-8 UTF-8
it_CH ISO-8859-1
it_IT.UTF-8 UTF-8
it_IT ISO-8859-1
it_IT@euro ISO-8859-15
iu_CA UTF-8
iw_IL.UTF-8 UTF-8
iw_IL ISO-8859-8
ja_JP.EUC-JP EUC-JP
ja_JP.UTF-8 UTF-8
ka_GE.UTF-8 UTF-8
ka_GE GEORGIAN-PS
kk_KZ.UTF-8 UTF-8
kk_KZ PT154
kl_GL.UTF-8 UTF-8
kl_GL ISO-8859-1
km_KH UTF-8
kn_IN UTF-8
ko_KR.EUC-KR EUC-KR
ko_KR.UTF-8 UTF-8
kok_IN UTF-8
ks_IN UTF-8
ks_IN@devanagari UTF-8
ku_TR.UTF-8 UTF-8
ku_TR ISO-8859-9
kw_GB.UTF-8 UTF-8
kw_GB ISO-8859-1
ky_KG UTF-8
lb_LU UTF-8
lg_UG.UTF-8 UTF-8
lg_UG ISO-8859-10
li_BE UTF-8
li_NL UTF-8
lij_IT UTF-8
lo_LA UTF-8
lt_LT.UTF-8 UTF-8
lt_LT ISO-8859-13
lv_LV.UTF-8 UTF-8
lv_LV ISO-8859-13
mag_IN UTF-8
mai_IN UTF-8
mg_MG.UTF-8 UTF-8
mg_MG ISO-8859-15
mhr_RU UTF-8
mi_NZ.UTF-8 UTF-8
mi_NZ ISO-8859-13
mk_MK.UTF-8 UTF-8
mk_MK ISO-8859-5
ml_IN UTF-8
mn_MN UTF-8
mr_IN UTF-8
ms_MY.UTF-8 UTF-8
ms_MY ISO-8859-1
mt_MT.UTF-8 UTF-8
mt_MT ISO-8859-3
my_MM UTF-8
nan_TW@latin UTF-8
nb_NO.UTF-8 UTF-8
nb_NO ISO-8859-1
nds_DE UTF-8
nds_NL UTF-8
ne_NP UTF-8
nl_AW UTF-8
nl_BE.UTF-8 UTF-8
nl_BE ISO-8859-1
nl_BE@euro ISO-8859-15
nl_NL.UTF-8 UTF-8
nl_NL ISO-8859-1
nl_NL@euro ISO-8859-15
nn_NO.UTF-8 UTF-8
nn_NO ISO-8859-1
nr_ZA UTF-8
nso_ZA UTF-8
oc_FR.UTF-8 UTF-8
oc_FR ISO-8859-1
om_ET UTF-8
om_KE.UTF-8 UTF-8
om_KE ISO-8859-1
or_IN UTF-8
os_RU UTF-8
pa_IN UTF-8
pa_PK UTF-8
pap_AN UTF-8
pl_PL.UTF-8 UTF-8
pl_PL ISO-8859-2
ps_AF UTF-8
pt_BR.UTF-8 UTF-8
pt_BR ISO-8859-1
pt_PT.UTF-8 UTF-8
pt_PT ISO-8859-1
pt_PT@euro ISO-8859-15
ro_RO.UTF-8 UTF-8
ro_RO ISO-8859-2
ru_RU.KOI8-R KOI8-R
ru_RU.UTF-8 UTF-8
ru_RU ISO-8859-5
ru_UA.UTF-8 UTF-8
ru_UA KOI8-U
rw_RW UTF-8
sa_IN UTF-8
sc_IT UTF-8
sd_IN UTF-8
sd_IN@devanagari UTF-8
se_NO UTF-8
shs_CA UTF-8
si_LK UTF-8
sid_ET UTF-8
sk_SK.UTF-8 UTF-8
sk_SK ISO-8859-2
sl_SI.UTF-8 UTF-8
sl_SI ISO-8859-2
so_DJ.UTF-8 UTF-8
so_DJ ISO-8859-1
so_ET UTF-8
so_KE.UTF-8 UTF-8
so_KE ISO-8859-1
so_SO.UTF-8 UTF-8
so_SO ISO-8859-1
sq_AL.UTF-8 UTF-8
sq_AL ISO-8859-1
sq_MK UTF-8
sr_ME UTF-8
sr_RS UTF-8
sr_RS@latin UTF-8
ss_ZA UTF-8
st_ZA.UTF-8 UTF-8
st_ZA ISO-8859-1
sv_FI.UTF-8 UTF-8
sv_FI ISO-8859-1
sv_FI@euro ISO-8859-15
sv_SE.UTF-8 UTF-8
sv_SE ISO-8859-1
sw_KE UTF-8
sw_TZ UTF-8
ta_IN UTF-8
ta_LK UTF-8
te_IN UTF-8
tg_TJ.UTF-8 UTF-8
tg_TJ KOI8-T
th_TH.UTF-8 UTF-8
th_TH TIS-620
ti_ER UTF-8
ti_ET UTF-8
tig_ER UTF-8
tk_TM UTF-8
tl_PH.UTF-8 UTF-8
tl_PH ISO-8859-1
tn_ZA UTF-8
tr_CY.UTF-8 UTF-8
tr_CY ISO-8859-9
tr_TR.UTF-8 UTF-8
tr_TR ISO-8859-9
ts_ZA UTF-8
tt_RU UTF-8
tt_RU@iqtelif UTF-8
ug_CN UTF-8
uk_UA.UTF-8 UTF-8
uk_UA KOI8-U
unm_US UTF-8
ur_IN UTF-8
ur_PK UTF-8
uz_UZ ISO-8859-1
uz_UZ@cyrillic UTF-8
ve_ZA UTF-8
vi_VN UTF-8
wa_BE ISO-8859-1
wa_BE@euro ISO-8859-15
wa_BE.UTF-8 UTF-8
wae_CH UTF-8
wal_ET UTF-8
wo_SN UTF-8
xh_ZA.UTF-8 UTF-8
xh_ZA ISO-8859-1
yi_US.UTF-8 UTF-8
yi_US CP1255
yo_NG UTF-8
yue_HK UTF-8
zh_CN.GB18030 GB18030
zh_CN.GBK GBK
zh_CN.UTF-8 UTF-8
zh_CN GB2312
zh_HK.UTF-8 UTF-8
zh_HK BIG5-HKSCS
zh_SG.UTF-8 UTF-8
zh_SG.GBK GBK
zh_SG GB2312
zh_TW.EUC-TW EUC-TW
zh_TW.UTF-8 UTF-8
zh_TW BIG5
zu_ZA.UTF-8 UTF-8
zu_ZA ISO-8859-1

window.location.href and window.open () methods in JavaScript

window.location.href is not a method, it's a property that will tell you the current URL location of the browser. Changing the value of the property will redirect the page.

window.open() is a method that you can pass a URL to that you want to open in a new window. For example:

window.location.href example:

window.location.href = 'http://www.google.com'; //Will take you to Google.

window.open() example:

window.open('http://www.google.com'); //This will open Google in a new window.

Additional Information:

window.open() can be passed additional parameters. See: window.open tutorial

Play multiple CSS animations at the same time

you can try something like this

set the parent to rotate and the image to scale so that the rotate and scale time can be different

_x000D_
_x000D_
div {_x000D_
  position: absolute;_x000D_
  top: 50%;_x000D_
  left: 50%;_x000D_
  width: 120px;_x000D_
  height: 120px;_x000D_
  margin: -60px 0 0 -60px;_x000D_
  -webkit-animation: spin 2s linear infinite;_x000D_
}_x000D_
.image {_x000D_
  position: absolute;_x000D_
  top: 50%;_x000D_
  left: 50%;_x000D_
  width: 120px;_x000D_
  height: 120px;_x000D_
  margin: -60px 0 0 -60px;_x000D_
  -webkit-animation: scale 4s linear infinite;_x000D_
}_x000D_
@-webkit-keyframes spin {_x000D_
  100% {_x000D_
    transform: rotate(180deg);_x000D_
  }_x000D_
}_x000D_
@-webkit-keyframes scale {_x000D_
  100% {_x000D_
    transform: scale(2);_x000D_
  }_x000D_
}
_x000D_
<div>_x000D_
  <img class="image" src="http://makeameme.org/media/templates/120/grumpy_cat.jpg" alt="" width="120" height="120" />_x000D_
</div>
_x000D_
_x000D_
_x000D_

How do I change a tab background color when using TabLayout?

You can have it in the xml.

<android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        app:tabTextColor="@color/colorGray"
        app:tabSelectedTextColor="@color/colorWhite"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

Import functions from another js file. Javascript

By default, scripts can't handle imports like that directly. You're probably getting another error about not being able to get Course or not doing the import.

If you add type="module" to your <script> tag, and change the import to ./course.js (because browsers won't auto-append the .js portion), then the browser will pull down course for you and it'll probably work.

import './course.js';

function Student() {
    this.firstName = '';
    this.lastName = '';
    this.course = new Course();
}

<html>
    <head>
        <script src="./models/student.js" type="module"></script>
    </head>
    <body>
        <div id="myDiv">
        </div>
        <script>
        window.onload= function() {
            var x = new Student();
            x.course.id = 1;
            document.getElementById('myDiv').innerHTML = x.course.id;
        }
        </script>
    </body>
</html>

If you're serving files over file://, it likely won't work. Some IDEs have a way to run a quick sever.

You can also write a quick express server to serve your files (install Node if you don't have it):

//package.json
{
  "scripts": { "start": "node server" },
  "dependencies": { "express": "latest" }
}

// server/index.js
const express = require('express');
const app = express();

app.use('/', express.static('PATH_TO_YOUR_FILES_HERE');
app.listen(8000);

With those two files, run npm install, then npm start and you'll have a server running over http://localhost:8000 which should point to your files.

Android - SMS Broadcast receiver

The Updated code is :

 private class SMSReceiver extends BroadcastReceiver {
                private Bundle bundle;
                private SmsMessage currentSMS;
                private String message;

                @Override
                public void onReceive(Context context, Intent intent) {

                    if (intent.getAction().equals("android.provider.Telephony.SMS_RECEIVED")) {
                        bundle = intent.getExtras();
                        if (bundle != null) {
                            Object[] pdu_Objects = (Object[]) bundle.get("pdus");
                            if (pdu_Objects != null) {

                                for (Object aObject : pdu_Objects) {

                                    currentSMS = getIncomingMessage(aObject, bundle);

                                    String senderNo = currentSMS.getDisplayOriginatingAddress();

                                    message = currentSMS.getDisplayMessageBody();
                                    Toast.makeText(OtpActivity.this, "senderNum: " + senderNo + " :\n message: " + message, Toast.LENGTH_LONG).show();
                                }
                                this.abortBroadcast();
                                // End of loop
                            }
                        }
                    } // bundle null
                }
            }

        private SmsMessage getIncomingMessage(Object aObject, Bundle bundle) {
            SmsMessage currentSMS;
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                String format = bundle.getString("format");
                currentSMS = SmsMessage.createFromPdu((byte[]) aObject, format);
            } else {
                currentSMS = SmsMessage.createFromPdu((byte[]) aObject);
            }
    return currentSMS;
}

older code was :

Object [] pdus = (Object[]) myBundle.get("pdus");

    messages = new SmsMessage[pdus.length];

    for (int i = 0; i < messages.length; i++)
    {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            String format = myBundle.getString("format");
            messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i], format);
        }
        else {
            messages[i] = SmsMessage.createFromPdu((byte[]) pdus[i]);
        }
        strMessage += "SMS From: " + messages[i].getOriginatingAddress();
        strMessage += " : ";
        strMessage += messages[i].getMessageBody();
        strMessage += "\n";
    } 

The simple SYntax of code is :

private class SMSReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(Telephony.Sms.Intents.SMS_RECEIVED_ACTION)) {
            SmsMessage[] smsMessages = Telephony.Sms.Intents.getMessagesFromIntent(intent);
            for (SmsMessage message : smsMessages) {
                // Do whatever you want to do with SMS.
            }
        }
    }
}

"Fatal error: Cannot redeclare <function>"

Another possible reason for getting that error is that your function has the same name as another PHP built-in function. For example,

function checkdate($date){
   $now=strtotime(date('Y-m-d H:i:s'));
   $tenYearsAgo=strtotime("-10 years", $now);
   $dateToCheck=strtotime($date);
   return ($tenYearsAgo > $dateToCheck) ? false : true;
}
echo checkdate('2016-05-12');

where the checkdate function already exists in PHP.

"psql: could not connect to server: Connection refused" Error when connecting to remote database

I have struggled with this when trying to remotely connect to a new PostgreSQL installation on my Raspberry Pi. Here's the full breakdown of what I did to resolve this issue:

First, open the PostgreSQL configuration file and make sure that the service is going to listen outside of localhost.

sudo [editor] /etc/postgresql/[version]/main/postgresql.conf

I used nano, but you can use the editor of your choice, and while I have version 9.1 installed, that directory will be for whichever version you have installed.

Search down to the section titled 'Connections and Authentication'. The first setting should be 'listen_addresses', and might look like this:

#listen_addresses = 'localhost'     # what IP address(es) to listen on;

The comments to the right give good instructions on how to change this field, and using the suggested '*' for all will work well.

Please note that this field is commented out with #. Per the comments, it will default to 'localhost', so just changing the value to '*' isn't enough, you also need to uncomment the setting by removing the leading #.

It should now look like this:

listen_addresses = '*'         # what IP address(es) to listen on;

You can also check the next setting, 'port', to make sure that you're connecting correctly. 5432 is the default, and is the port that psql will try to connect to if you don't specify one.

Save and close the file, then open the Client Authentication config file, which is in the same directory:

sudo [editor] /etc/postgresql/[version]/main/pg_hba.conf

I recommend reading the file if you want to restrict access, but for basic open connections you'll jump to the bottom of the file and add a line like this:

host all all all md5

You can press tab instead of space to line the fields up with the existing columns if you like.

Personally, I instead added a row that looked like this:

host [database_name] pi 192.168.1.0/24 md5

This restricts the connection to just the one user and just the one database on the local area network subnet.

Once you've saved changes to the file you will need to restart the service to implement the changes.

sudo service postgresql restart

Now you can check to make sure that the service is openly listening on the correct port by using the following command:

sudo netstat -ltpn

If you don't run it as elevated (using sudo) it doesn't tell you the names of the processes listening on those ports.

One of the processes should be Postgres, and the Local Address should be open (0.0.0.0) and not restricted to local traffic only (127.0.0.1). If it isn't open, then you'll need to double check your config files and restart the service. You can again confirm that the service is listening on the correct port (default is 5432, but your configuration could be different).

Finally you'll be able to successfully connect from a remote computer using the command:

psql -h [server ip address] -p [port number, optional if 5432] -U [postgres user name] [database name]

MVC ajax json post to controller action method

Below is how I got this working.

The Key point was: I needed to use the ViewModel associated with the view in order for the runtime to be able to resolve the object in the request.

[I know that that there is a way to bind an object other than the default ViewModel object but ended up simply populating the necessary properties for my needs as I could not get it to work]

[HttpPost]  
  public ActionResult GetDataForInvoiceNumber(MyViewModel myViewModel)  
  {            
     var invoiceNumberQueryResult = _viewModelBuilder.HydrateMyViewModelGivenInvoiceDetail(myViewModel.InvoiceNumber, myViewModel.SelectedCompanyCode);
     return Json(invoiceNumberQueryResult, JsonRequestBehavior.DenyGet);
  }

The JQuery script used to call this action method:

var requestData = {
         InvoiceNumber: $.trim(this.value),
         SelectedCompanyCode: $.trim($('#SelectedCompanyCode').val())
      };


      $.ajax({
         url: '/en/myController/GetDataForInvoiceNumber',
         type: 'POST',
         data: JSON.stringify(requestData),
         dataType: 'json',
         contentType: 'application/json; charset=utf-8',
         error: function (xhr) {
            alert('Error: ' + xhr.statusText);
         },
         success: function (result) {
            CheckIfInvoiceFound(result);
         },
         async: true,
         processData: false
      });

Enum Naming Convention - Plural

In general, the best practice recommendation is singular, except for those enums that have the [Flags] attribute attached to them, (and which therefore can contain bit fields), which should be plural.

After reading your edited question, I get the feeling you may think the property name or variable name has to be different from the enum type name... It doesn't. The following is perfectly fine...

  public enum Status { New, Edited, Approved, Cancelled, Closed }

  public class Order
  {
      private Status stat;
      public Status Status
      { 
         get { return stat; }
         set { stat = value; }
      }
  }

Use underscore inside Angular controllers

I use this:

var myapp = angular.module('myApp', [])
  // allow DI for use in controllers, unit tests
  .constant('_', window._)
  // use in views, ng-repeat="x in _.range(3)"
  .run(function ($rootScope) {
     $rootScope._ = window._;
  });

See https://github.com/angular/angular.js/wiki/Understanding-Dependency-Injection about halfway for some more info on run.

Looping each row in datagridview

Best aproach for me was:

  private void grid_receptie_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
    {
        int X = 1;
        foreach(DataGridViewRow row in grid_receptie.Rows)
        {
            row.Cells["NR_CRT"].Value = X;
            X++;
        }
    }

"find: paths must precede expression:" How do I specify a recursive search that also finds files in the current directory?

What's happening is that the shell is expanding "*test.c" into a list of files. Try escaping the asterisk as:

find . -name \*test.c

How to remove all the punctuation in a string? (Python)

import string

asking = "".join(l for l in asking if l not in string.punctuation)

filter with string.punctuation.

How to use Checkbox inside Select Option

The best plugin so far is Bootstrap Multiselect

<html xmlns="http://www.w3.org/1999/xhtml">
<head>

<title>jQuery Multi Select Dropdown with Checkboxes</title>

<link rel="stylesheet" href="css/bootstrap-3.1.1.min.css" type="text/css" />
<link rel="stylesheet" href="css/bootstrap-multiselect.css" type="text/css" />

<script type="text/javascript" src="http://code.jquery.com/jquery-1.8.2.js"></script>
<script type="text/javascript" src="js/bootstrap-3.1.1.min.js"></script>
<script type="text/javascript" src="js/bootstrap-multiselect.js"></script>

</head>

<body>

<form id="form1">

<div style="padding:20px">

<select id="chkveg" multiple="multiple">

    <option value="cheese">Cheese</option>
    <option value="tomatoes">Tomatoes</option>
    <option value="mozarella">Mozzarella</option>
    <option value="mushrooms">Mushrooms</option>
    <option value="pepperoni">Pepperoni</option>
    <option value="onions">Onions</option>

</select>

<br /><br />

<input type="button" id="btnget" value="Get Selected Values" />

<script type="text/javascript">

$(function() {

    $('#chkveg').multiselect({

        includeSelectAllOption: true
    });

    $('#btnget').click(function(){

        alert($('#chkveg').val());
    });
});

</script>

</div>

</form>

</body>
</html>

Here's the DEMO

_x000D_
_x000D_
$(function() {_x000D_
_x000D_
  $('#chkveg').multiselect({_x000D_
    includeSelectAllOption: true_x000D_
  });_x000D_
_x000D_
  $('#btnget').click(function() {_x000D_
    alert($('#chkveg').val());_x000D_
  });_x000D_
});
_x000D_
.multiselect-container>li>a>label {_x000D_
  padding: 4px 20px 3px 20px;_x000D_
}
_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>_x000D_
<script src="https://davidstutz.de/bootstrap-multiselect/dist/js/bootstrap-multiselect.js"></script>_x000D_
<link href="https://davidstutz.de/bootstrap-multiselect/docs/css/bootstrap-3.3.2.min.css" rel="stylesheet"/>_x000D_
<link href="https://davidstutz.de/bootstrap-multiselect/dist/css/bootstrap-multiselect.css" rel="stylesheet"/>_x000D_
<script src="https://davidstutz.de/bootstrap-multiselect/docs/js/bootstrap-3.3.2.min.js"></script>_x000D_
_x000D_
<form id="form1">_x000D_
  <div style="padding:20px">_x000D_
_x000D_
    <select id="chkveg" multiple="multiple">_x000D_
      <option value="cheese">Cheese</option>_x000D_
      <option value="tomatoes">Tomatoes</option>_x000D_
      <option value="mozarella">Mozzarella</option>_x000D_
      <option value="mushrooms">Mushrooms</option>_x000D_
      <option value="pepperoni">Pepperoni</option>_x000D_
      <option value="onions">Onions</option>_x000D_
    </select>_x000D_
    _x000D_
    <br /><br />_x000D_
_x000D_
    <input type="button" id="btnget" value="Get Selected Values" />_x000D_
  </div>_x000D_
</form>
_x000D_
_x000D_
_x000D_

How to make a Generic Type Cast function

Something like this?

public static T ConvertValue<T>(string value)
{
    return (T)Convert.ChangeType(value, typeof(T));
}

You can then use it like this:

int val = ConvertValue<int>("42");

Edit:

You can even do this more generic and not rely on a string parameter provided the type U implements IConvertible - this means you have to specify two type parameters though:

public static T ConvertValue<T,U>(U value) where U : IConvertible
{
    return (T)Convert.ChangeType(value, typeof(T));
}

I considered catching the InvalidCastException exception that might be raised by Convert.ChangeType() - but what would you return in this case? default(T)? It seems more appropriate having the caller deal with the exception.

SQL using sp_HelpText to view a stored procedure on a linked server

Little addition in answer if you have different user rather then dbo then do like this.

EXEC  [ServerName].[DatabaseName].dbo.sp_HelpText '[user].[storedProcName]'