Programs & Examples On #Big5

What is the function __construct used for?

__construct() is the method name for the constructor. The constructor is called on an object after it has been created, and is a good place to put initialisation code, etc.

class Person {

    public function __construct() {
        // Code called for each new Person we create
    }

}

$person = new Person();

A constructor can accept parameters in the normal manner, which are passed when the object is created, e.g.

class Person {

    public $name = '';

    public function __construct( $name ) {
        $this->name = $name;
    }

}

$person = new Person( "Joe" );
echo $person->name;

Unlike some other languages (e.g. Java), PHP doesn't support overloading the constructor (that is, having multiple constructors which accept different parameters). You can achieve this effect using static methods.

Note: I retrieved this from the log of the (at time of this writing) accepted answer.

Practical uses of git reset --soft?

Another use case is when you want to replace the other branch with yours in a pull request, for example, lets say that you have a software with features A, B, C in develop.

You are developing with the next version and you:

  • Removed feature B

  • Added feature D

In the process, develop just added hotfixes for feature B.

You can merge develop into next, but that can be messy sometimes, but you can also use git reset --soft origin/develop and create a commit with your changes and the branch is mergeable without conflicts and keep your changes.

It turns out that git reset --soft is a handy command. I personally use it a lot to squash commits that dont have "completed work" like "WIP" so when I open the pull request, all my commits are understandable.

How would I access variables from one class to another?

Can you explain why you want to do this?

You're playing around with instance variables/attributes which won't migrate from one class to another (they're bound not even to ClassA, but to a particular instance of ClassA that you created when you wrote ClassA()). If you want to have changes in one class show up in another, you can use class variables:

class ClassA(object):
   var1 = 1
   var2 = 2
   @classmethod
   def method(cls):
       cls.var1 = cls.var1 + cls.var2
       return cls.var1

In this scenario, ClassB will pick up the values on ClassA from inheritance. You can then access the class variables via ClassA.var1, ClassB.var1 or even from an instance ClassA().var1 (provided that you haven't added an instance method var1 which will be resolved before the class variable in attribute lookup.

I'd have to know a little bit more about your particular use case before I know if this is a course of action that I would actually recommend though...

Is it possible to open a Windows Explorer window from PowerShell?

$startinfo = new-object System.Diagnostics.ProcessStartInfo 
$startinfo.FileName = "explorer.exe"
$startinfo.WorkingDirectory = 'D:\foldername'

[System.Diagnostics.Process]::Start($startinfo)

Hope this helps

Element-wise addition of 2 lists?

a_list = []
b_list = []
for i in range(1,100):
    a_list.append(random.randint(1,100))

for i in range(1,100):
    a_list.append(random.randint(101,200))
[sum(x) for x in zip(a_list , b_list )]

iOS Safari – How to disable overscroll but allow scrollable divs to scroll normally?

While disabling all "touchmove" events might seem like a good idea, as soon as you need other scrollable elements on the page it will cause problems. On top of that, if you only disable "touchmove" events on certain elements (e.g. body if you want the page to be non-scrollable), as soon as it is enabled anywhere else, IOS will cause unstoppable propagation in Chrome when the URL bar toggles.

While I cannot explain this behavior, it looks like the only way to prevent seems to set the body's position to fixed. The only problem doing is that you will lose the position of the document - this is especially annoying in modals for example. One way to solve it would be to use these simple VanillaJS functions:

function disableDocumentScrolling() {
    if (document.documentElement.style.position != 'fixed') {
        // Get the top vertical offset.
        var topVerticalOffset = (typeof window.pageYOffset != 'undefined') ?
            window.pageYOffset : (document.documentElement.scrollTop ? 
            document.documentElement.scrollTop : 0);
        // Set the document to fixed position (this is the only way around IOS' overscroll "feature").
        document.documentElement.style.position = 'fixed';
        // Set back the offset position by user negative margin on the fixed document.
        document.documentElement.style.marginTop = '-' + topVerticalOffset + 'px';
    }
}

function enableDocumentScrolling() {
    if (document.documentElement.style.position == 'fixed') {
        // Remove the fixed position on the document.
        document.documentElement.style.position = null;
        // Calculate back the original position of the non-fixed document.
        var scrollPosition = -1 * parseFloat(document.documentElement.style.marginTop);
        // Remove fixed document negative margin.
        document.documentElement.style.marginTop = null;
        // Scroll to the original position of the non-fixed document.
        window.scrollTo(0, scrollPosition);
    }
}

Using this solution you can have a fixed document and any other element in your page can overflow by using simple CSS (e.g., overflow: scroll;). No need for special classes or anything else.

How do I install PyCrypto on Windows?

In general

vcvarsall.bat is part of the Visual C++ compiler, you need that to install what you are trying to install. Don't even try to deal with MingGW if your Python was compiled with Visual Studio toolchain and vice versa. Even the version of the Microsoft tool chain is important. Python compiled with VS 2008 won't work with extensions compiled with VS 2010!

You have to compile PyCrypto with the same compiler that the version of Python was compiled with. Google for "Unable to find vcvarsall.bat" because that is the root of your problem, it is a very common problem with compiling Python extensions on Windows.

There is a lot of information and a lot to read to get this right on whatever system you are on with this link.

Beware using Visual Studio 2010 or not using Visual Studio 2008

As far as I know the following is still true. This was posted in the link above in June, 2010 referring to trying to build extensions with VS 2010 Express against the Python installers available on python.org.

Be careful if you do this. Python 2.6 and 2.7 from python.org are built with Visual Studio 2008 compilers. You will need to link with the same CRT (msvcr90.dll) as Python.

Visual Studio 2010 Express links with the wrong CRT version: msvcr100.dll.

If you do this, you must also re-build Python with Visual Studio 2010 Express. You cannot use the standard Python binary installer for Windows. Nor can you use any C/C++ extensions built with a different compiler than Visual Studio 2010 (Express).

Opinion: This is one reason I abandoned Windows for all serious development work for OSX!

Media Queries - In between two widths

@Jonathan Sampson i think your solution is wrong if you use multiple @media.

You should use (min-width first):

@media screen and (min-width:400px) and (max-width:900px){
   ...
}

Difficulty with ng-model, ng-repeat, and inputs

You get into a difficult situation when it is necessary to understand how scopes, ngRepeat and ngModel with NgModelController work. Also try to use 1.0.3 version. Your example will work a little differently.

You can simply use solution provided by jm-

But if you want to deal with the situation more deeply, you have to understand:

  • how AngularJS works;
  • scopes have a hierarchical structure;
  • ngRepeat creates new scope for every element;
  • ngRepeat build cache of items with additional information (hashKey); on each watch call for every new item (that is not in the cache) ngRepeat constructs new scope, DOM element, etc. More detailed description.
  • from 1.0.3 ngModelController rerenders inputs with actual model values.

How your example "Binding to each element directly" works for AngularJS 1.0.3:

  • you enter letter 'f' into input;
  • ngModelController changes model for item scope (names array is not changed) => name == 'Samf', names == ['Sam', 'Harry', 'Sally'];
  • $digest loop is started;
  • ngRepeat replaces model value from item scope ('Samf') by value from unchanged names array ('Sam');
  • ngModelController rerenders input with actual model value ('Sam').

How your example "Indexing into the array" works:

  • you enter letter 'f' into input;
  • ngModelController changes item in names array => `names == ['Samf', 'Harry', 'Sally'];
  • $digest loop is started;
  • ngRepeat can't find 'Samf' in cache;
  • ngRepeat creates new scope, adds new div element with new input (that is why the input field loses focus - old div with old input is replaced by new div with new input);
  • new values for new DOM elements are rendered.

Also, you can try to use AngularJS Batarang and see how changes $id of the scope of div with input in which you enter.

Perform .join on value in array of objects

try this

var x= [
  {name: "Joe", age: 22},
  {name: "Kevin", age: 24},
  {name: "Peter", age: 21}
]

function joinObj(a, attr) {
  var out = []; 
  for (var i=0; i<a.length; i++) {  
    out.push(a[i][attr]); 
  } 
 return out.join(", ");
}

var z = joinObj(x,'name');
z > "Joe, Kevin, Peter"
var y = joinObj(x,'age');
y > "22, 24, 21"

remove / reset inherited css from an element

One simple approach would be to use the !important modifier in css, but this can be overridden in the same way from users.

Maybe a solution can be achieved with jquery by traversing the entire DOM to find your (re)defined classes and removing / forcing css styles.

Comparing Class Types in Java

It prints true on my machine. And it should, otherwise nothing in Java would work as expected. (This is explained in the JLS: 4.3.4 When Reference Types Are the Same)

Do you have multiple classloaders in place?


Ah, and in response to this comment:

I realise I have a typo in my question. I should be like this:

MyImplementedObject obj = new MyImplementedObject ();
if(obj.getClass() == MyObjectInterface.class) System.out.println("true");

MyImplementedObject implements MyObjectInterface So in other words, I am comparing it with its implemented objects.

OK, if you want to check that you can do either:

if(MyObjectInterface.class.isAssignableFrom(obj.getClass()))

or the much more concise

if(obj instanceof MyobjectInterface)

Certificate has either expired or has been revoked

When nor deleting and re-downloading the profiles, nor "Clean" helps I do this:

Preferences> Accounts> Apple IDs> select your acc> select your team> View Details...> reset your signing identity (iOS Development in my case).

This always worked for me.

MongoDB - admin user not authorized

Perhaps a quick example of how to change a current user will be helpful to somebody. This is what I was actually looking for.

Following advice of @JohnPetrone I added readWrite role to my admin user with grantRolesToUser

> use admin
> db.grantRolesToUser("admin",["readWrite"])
> show collections
system.users
system.version

Anaconda Navigator won't launch (windows 10)

This helped to me:

conda install anaconda-navigator

How to search all loaded scripts in Chrome Developer Tools?

In Widows it is working for me. Control Shift F and then it opens a search window at the bottom. Make sure you expand the bottom area to see the new search window.

enter image description here

Explicit vs implicit SQL joins

As Leigh Caldwell has stated, the query optimizer can produce different query plans based on what functionally looks like the same SQL statement. For further reading on this, have a look at the following two blog postings:-

One posting from the Oracle Optimizer Team

Another posting from the "Structured Data" blog

I hope you find this interesting.

iOS 7 status bar overlapping UI

Actually, I found Gimi's answer to be the best answer, and I've been looking a lot! Just to add to Gimi's answer, and also answer ignacio-munizaga's reply on that answer, The code will execute whenever the view appears, which means after you close an inline browser, or after camera roll etc. so I just put a bool value stating whether the size has already been adjusted.

The final code looks like:

bool sizeWasAdjusted = false;
- (void)viewWillAppear:(BOOL)animated
{
    // View defaults to full size.  If you want to customize the view's size, or its subviews (e.g. webView),
    // you can do so here.
    //Lower screen 20px on ios 7
    if (!sizeWasAdjusted && [[[UIDevice currentDevice] systemVersion] floatValue] >= 7) {
        CGRect viewBounds = [self.webView bounds];
        viewBounds.origin.y = 18;
        viewBounds.size.height = viewBounds.size.height - 18;
        self.webView.frame = viewBounds;
        sizeWasAdjusted = true;
    }
    [super viewWillAppear:animated];
}

Html attributes for EditorFor() in ASP.NET MVC

In my case I was trying to create an HTML5 number input editor template that could receive additional attributes. A neater approach would be to write your own HTML Helper, but since I already had my .ascx template, I went with this approach:

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %>
<input id="<%= Regex.Replace(ViewData.TemplateInfo.GetFullHtmlFieldId(""), @"[\[\]]", "_") %>" name="<%= ViewData.TemplateInfo.HtmlFieldPrefix %>" type="number" value="<%= ViewData.TemplateInfo.FormattedModelValue %>"
<% if (ViewData["attributes"] != null)
   {
       Dictionary<string, string> attributes = (Dictionary<string, string>)ViewData["attributes"];
       foreach (string attributeName in attributes.Keys){%>
        <%= String.Format(" {0}=\"{1}\"", attributeName, attributes[attributeName])%>
       <% }
   } %> />

This ugly bit creates a number type input and looks for a ViewData Dictionary with the key "attributes". It will iterate through the dictionary adding its key/value pairs as attributes. The Regex in the ID attribute is unrelated and is there because when used in a collection, GetFullHtmlFieldId() returns an id containing square brackets [] which it would normally escape as underscores.

This template is then called like this:

Html.EditorFor(m => m.Quantity, "NumberField", new { attributes = new Dictionary<string, string>() { { "class", "txtQuantity" } } }

Verbose, but it works. You could probably use reflection in the template to use property names as attribute names instead of using a dictionary.

How to edit my Excel dropdown list?

Attribute_Brands is a named range.

On any worksheet (tab) press F5 and type Attribute_Brands into the reference box and click on the OK button.

This will take you to the named range.

The data in it can be updated by typing new values into the cells.

The named range can be altered via the 'Insert - Name - Define' menu.

MySQL user DB does not have password columns - Installing MySQL on OSX

Use the ALTER USER command rather than trying to update a USER row. Keep in mind that there may be more than one 'root' user, because user entities are qualified also by the machine from which they connect

https://dev.mysql.com/doc/refman/5.7/en/alter-user.html

For example.

ALTER USER 'root'@'localhost' IDENTIFIED BY 'new-password' 
ALTER USER 'root'@'*' IDENTIFIED BY 'new-password' 

How do I POST JSON data with cURL?

For Windows, having a single quote for the -d value did not work for me, but it did work after changing to double quote. Also I needed to escape double quotes inside curly brackets.

That is, the following did not work:

curl -i -X POST -H "Content-Type: application/json" -d '{"key":"val"}' http://localhost:8080/appname/path

But the following worked:

curl -i -X POST -H "Content-Type: application/json" -d "{\"key\":\"val\"}" http://localhost:8080/appname/path

Get latitude and longitude based on location name with Google Autocomplete API

You can use the Google Geocoder service in the Google Maps API to convert from your location name to a latitude and longitude. So you need some code like:

var geocoder = new google.maps.Geocoder();
var address = document.getElementById("address").value;
geocoder.geocode( { 'address': address}, function(results, status) {
  if (status == google.maps.GeocoderStatus.OK)
  {
      // do something with the geocoded result
      //
      // results[0].geometry.location.latitude
      // results[0].geometry.location.longitude
  }
});

Update

Are you including the v3 javascript API?

<script type="text/javascript"
     src="http://maps.google.com/maps/api/js?sensor=set_to_true_or_false">
</script> 

How to recover just deleted rows in mysql?

I'm sorry, bu it's not posible, unless you made a backup file earlier.

EDIT: Actually it is possible, but it gets very tricky and you shouldn't think about it if data wasn't really, really important. You see: when data get's deleted from a computer it still remains in the same place on the disk, only its sectors are marked as empty. So data remains intact, except if it gets overwritten by new data. There are several programs designed for this purpose and there are companies who specialize in data recovery, though they are rather expensive.

laravel Eloquent ORM delete() method

Before delete , there are several methods in laravel.

User::find(1) and User::first() return an instance.

User::where('id',1)->get and User::all() return a collection of instance.

call delete on an model instance will returns true/false

$user=User::find(1);
$user->delete(); //returns true/false

call delete on a collection of instance will returns a number which represents the number of the records had been deleted

//assume you have 10 users, id from 1 to 10;
$result=User::where('id','<',11)->delete(); //returns 11 (the number of the records had been deleted)

//lets call delete again
$result2=User::where('id','<',11)->delete(); //returns 0 (we have already delete the id<11 users, so this time we delete nothing, the result should be the number of the records had been deleted(0)  ) 

Also there are other delete methods, you can call destroy as a model static method like below

$result=User::destroy(1,2,3);
$result=User::destroy([1,2,3]);
$result=User::destroy(collect([1, 2, 3]));
//these 3 statement do the same thing, delete id =1,2,3 users, returns the number of the records had been deleted

One more thing ,if you are new to laravel ,you can use php artisan tinker to see the result, which is more efficient and then dd($result) , print_r($result);

import sun.misc.BASE64Encoder results in error compiled in Eclipse

I am using unix system.

In eclipse project-> Properties -> Java Compiler -> Errors/Warning -> Forbidden Access(access rule) -> Turn it to warning/Ignore(Previously it was set to Error).

How to make a parent div auto size to the width of its children divs

The parent div (I assume the outermost div) is display: block and will fill up all available area of its container (in this case, the body) that it can. Use a different display type -- inline-block is probably what you are going for:

http://jsfiddle.net/a78xy/

Return HTTP status code 201 in flask

You can use Response to return any http status code.

> from flask import Response
> return Response("{'a':'b'}", status=201, mimetype='application/json')

Difference between string and text in rails?

String if the size is fixed and small and text if it is variable and big. This is kind of important because text is way bigger than strings. It contains a lot more kilobytes.

So for small fields always use string(varchar). Fields like. first_name, login, email, subject (of a article or post) and example of texts: content/body of a post or article. fields for paragraphs etc

String size 1 to 255 (default = 255)

Text size 1 to 4294967296 (default = 65536)2

What is the size of an enum in C?

Taken from the current C Standard (C99): http://www.open-std.org/JTC1/SC22/WG14/www/docs/n1256.pdf

6.7.2.2 Enumeration specifiers
[...]
Constraints
The expression that defines the value of an enumeration constant shall be an integer constant expression that has a value representable as an int.
[...]
Each enumerated type shall be compatible with char, a signed integer type, or an unsigned integer type. The choice of type is implementation-defined, but shall be capable of representing the values of all the members of the enumeration.

Not that compilers are any good at following the standard, but essentially: If your enum holds anything else than an int, you're in deep "unsupported behavior that may come back biting you in a year or two" territory.

Update: The latest publicly available draft of the C Standard (C11): http://www.open-std.org/JTC1/SC22/WG14/www/docs/n1570.pdf contains the same clauses. Hence, this answer still holds for C11.

Byte[] to ASCII

As an alternative to reading a data from a stream to a byte array, you could let the framework handle everything and just use a StreamReader set up with an ASCII encoding to read in the string. That way you don't need to worry about getting the appropriate buffer size or larger data sizes.

using (var reader = new StreamReader(stream, Encoding.ASCII))
{
    string theString = reader.ReadToEnd();
    // do something with theString
}

How to check if a string contains a substring in Bash

This Stack Overflow answer was the only one to trap space and dash characters:

# For null cmd arguments checking   
to_check=' -t'
space_n_dash_chars=' -'
[[ $to_check == *"$space_n_dash_chars"* ]] && echo found

animating addClass/removeClass with jQuery

Another solution (but it requires jQueryUI as pointed out by Richard Neil Ilagan in comments) :-

addClass, removeClass and toggleClass also accepts a second argument; the time duration to go from one state to the other.

$(this).addClass('abc',1000);

See jsfiddle:- http://jsfiddle.net/6hvZT/1/

git remote add with other SSH port

You can just do this:

git remote add origin ssh://user@host:1234/srv/git/example

1234 is the ssh port being used

How to find out the number of CPUs using python

Can't figure out how to add to the code or reply to the message but here's support for jython that you can tack in before you give up:

# jython
try:
    from java.lang import Runtime
    runtime = Runtime.getRuntime()
    res = runtime.availableProcessors()
    if res > 0:
        return res
except ImportError:
    pass

Reference - What does this regex mean?

The Stack Overflow Regular Expressions FAQ

See also a lot of general hints and useful links at the tag details page.


Online tutorials

Quantifiers

Character Classes

Escape Sequences

Anchors

(Also see "Flavor-Specific Information ? Java ? The functions in Matcher")

Groups

Lookarounds

Modifiers

Other:

Common Tasks

Advanced Regex-Fu

Flavor-Specific Information

(Except for those marked with *, this section contains non-Stack Overflow links.)

General information

(Links marked with * are non-Stack Overflow links.)

Examples of regex that can cause regex engine to fail

Tools: Testers and Explainers

(This section contains non-Stack Overflow links.)

Select info from table where row has max date

You can use a window MAX() like this:

SELECT
  *, 
  max_date = MAX(date) OVER (PARTITION BY group)
FROM table

to get max dates per group alongside other data:

group  date      cash  checks  max_date
-----  --------  ----  ------  --------
1      1/1/2013  0     0       1/3/2013
2      1/1/2013  0     800     1/1/2013
1      1/3/2013  0     700     1/3/2013
3      1/1/2013  0     600     1/5/2013
1      1/2/2013  0     400     1/3/2013
3      1/5/2013  0     200     1/5/2013

Using the above output as a derived table, you can then get only rows where date matches max_date:

SELECT
  group,
  date,
  checks
FROM (
  SELECT
    *, 
    max_date = MAX(date) OVER (PARTITION BY group)
  FROM table
) AS s
WHERE date = max_date
;

to get the desired result.

Basically, this is similar to @Twelfth's suggestion but avoids a join and may thus be more efficient.

You can try the method at SQL Fiddle.

CONVERT Image url to Base64

View this answer: https://stackoverflow.com/a/20285053/5065874 by @HaNdTriX

Basically, he implemented this function:

function toDataUrl(url, callback) {
    var xhr = new XMLHttpRequest();
    xhr.onload = function() {
        var reader = new FileReader();
        reader.onloadend = function() {
            callback(reader.result);
        }
        reader.readAsDataURL(xhr.response);
    };
    xhr.open('GET', url);
    xhr.responseType = 'blob';
    xhr.send();
}

And in your case, you can use it like this:

toDataUrl(imagepath, function(myBase64) {
    console.log(myBase64); // myBase64 is the base64 string
});

Counting number of lines, words, and characters in a text file

Is there some reason why you think that:

while(in.hasNext())
{
    in.next();
    words++;
}

will not consume the entire input stream?

It will do so, meaning that your other two while loops will never iterate. That's why your values for words and lines are still set to zero.

You're probably better off reading the file one character at a time, increasing the character count each time through the loop, and also detecting the character to decide whether or not to increment the other counters.

Basically, wherever you find a \n, increase the line count - you should probably also do this if the last character in the stream wasn't \n.

And, whenever you transition from white-space to non-white-space, increase the word count (there'll probably be some tricky edge case processing at the stream beginning but that's an implementation issue).

You're looking at something like the following pseudo-code:

# Init counters and last character

charCount = 0
wordCount = 0
lineCount = 0
lastChar = ' '

# Start loop.

currChar = getNextChar()
while currChar != EOF:
    # Every character counts.

    charCount++;

    # Words only on whitespace transitions.

    if isWhite(lastChar) && !isWhite(currChar):
        wordCount++

    # Lines only on newline characters.

    if currChar == '\n':
        lineCount++;
    lastChar = currChar
    currChar = getNextChar()

# Handle incomplete last line.

if lastChar != '\n':
    lineCount++;

How to get current route

You can use ActivatedRoute to get the current router

Original Answer (for RC version)

I found a solution on AngularJS Google Group and it's so easy!

ngOnInit() {
  this.router.subscribe((url) => console.log(url));
}

Here's the original answer

https://groups.google.com/d/msg/angular/wn1h0JPrF48/zl1sHJxbCQAJ

How can I update npm on Windows?

For me, after totally uninstalling node. 10.29, and then installing node 4.2.2, there remained a 10.29 node.exe file in my c:\windows folder.

I found this by using the following command:

where.exe node

The command returned:

C:\Windows\node.exe
C:\Program Files\nodejs\node.exe

So even though I had successfully installed version 4.2.2 via the msi executable, the command "node -v" would continue to return 10.29.

I resolved this by deleting this file:

C:\Windows\node.exe

Append String in Swift

In the accepted answer PREMKUMAR there are a couple of errors in his Complete code in Swift answer. First print should read (appendString) and Second print should read (appendString1). Also, updated println deprecated in Swift 2.0

His

let string1 = "This is"
let string2 = "Swift Language"
var appendString = "\(string1) \(string2)"
var appendString1 = string1+string2
println("APPEND STRING1:\(appendString1)")
println("APPEND STRING2:\(appendString2)")

Corrected

let string1 = "This is"
let string2 = "Swift Language"
var appendString = "\(string1) \(string2)"
var appendString1 = string1+string2
print("APPEND STRING:\(appendString)")
print("APPEND STRING1:\(appendString1)")

Creating files and directories via Python

import os

path = chap_name

if not os.path.exists(path):
    os.makedirs(path)

filename = img_alt + '.jpg'
with open(os.path.join(path, filename), 'wb') as temp_file:
    temp_file.write(buff)

Key point is to use os.makedirs in place of os.mkdir. It is recursive, i.e. it generates all intermediate directories. See http://docs.python.org/library/os.html

Open the file in binary mode as you are storing binary (jpeg) data.

In response to Edit 2, if img_alt sometimes has '/' in it:

img_alt = os.path.basename(img_alt)

How to count days between two dates in PHP?

You can use date_diff to calculate the difference between two dates:

$date1 = date_create("2013-03-15");
$date2 = date_create("2013-12-12");
$diff =  date_diff($date1 , $date2);
echo  $diff->format("%R%a days");

How do I create an .exe for a Java program?

Most of the programs that convert java applications to .exe files are just wrappers around the program, and the end user will still need the JRE installed to run it. As far as I know there aren't any converters that will make it a native executable from bytecode (There have been attempts, but if any turned out successful you would hear of them by now).

As for wrappers, the best ones i've used (as previously suggested) are:

JSmooth

and

Launch4j

best of luck!

How do you get/set media volume (not ringtone volume) in Android?

Instead of AudioManager.STREAM_RING you shoul use AudioManager.STREAM_MUSIC This question has already discussed here.

How do I "Add Existing Item" an entire directory structure in Visual Studio?

It has been a while since this was originally posted, but here is an alternative answer. If you only care to be able to look at the physical files from inside visual studio and do not necessarily require to see them in the solution explorer default view, then click on the switch view button and choose the folder view and any physical directory/directories that are under your solution root folder will appear here even if they do not appear in the solution explorer default view.

folder view

If however, you want to add a folder tree that isn't too large as a virtual solution directory/directories to match your existing tree structure, do that and and then "add the existing" physical files to the virtual directory/directories. If the physical directory exists in your solution directory it will not copy the files - it will link directly to the physical files but they will appear as part of the solution virtual directories.

How do I remove all .pyc files from a project?

Django Extension

Note: This answer is very specific to Django project that have already been using Django Extension.

python manage.py clean_pyc

The implementation can be viewed in its source code.

Running Python from Atom

Follow the steps:

  1. Install Python
  2. Install Atom
  3. Install and configure Atom package for Python
  4. Install and configure Python Linter
  5. Install Script Package in Atom
  6. Download and install Syntax Highlighter for Python
  7. Install Version control package Run Python file

More details for each step Click Here

jQuery date/time picker

I have ran into that same problem. I actually developed my using server side programming, but I did a quick search to try and help you out and found this.

Seems alright, didn't look at the source too much, but seems to be purely JavaScript.

Take look:

http://www.rainforestnet.com/datetimepicker/datetimepicker.htm

Here is the demo page link:

http://www.rainforestnet.com/datetimepicker/datetimepicker-demo.htm

good luck

How to perform a fade animation on Activity transition?

you can also use this code in your style.xml file so you don't need to write anything else in your activity.java

<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
    <item name="android:windowAnimationStyle">@style/AppTheme.WindowTransition</item>
</style>

<!-- Setting window animation -->
<style name="AppTheme.WindowTransition">
    <item name="android:windowEnterAnimation">@android:anim/fade_in</item>
    <item name="android:windowExitAnimation">@android:anim/fade_out</item>
</style>

How to load an external webpage into a div of a html page

Using simple html,

 <div> 
    <object type="text/html" data="http://validator.w3.org/" width="800px" height="600px" style="overflow:auto;border:5px ridge blue">
    </object>
 </div>

Or jquery,

<script>
        $("#mydiv")
            .html('<object data="http://your-website-domain"/>');
</script>

JSFIDDLE DEMO

How to go to a URL using jQuery?

window.location is just what you need. Other thing you can do is to create anchor element and simulate click on it

$("<a href='your url'></a>").click(); 

How to get the fragment instance from the FragmentActivity?

To get the fragment instance in a class that extends FragmentActivity:

MyclassFragment instanceFragment=
    (MyclassFragment)getSupportFragmentManager().findFragmentById(R.id.idFragment);

To get the fragment instance in a class that extends Fragment:

MyclassFragment instanceFragment =  
    (MyclassFragment)getFragmentManager().findFragmentById(R.id.idFragment);

Display an image with Python

If you use matplotlib, you need to show the image using plt.show() unless you are not in interactive mode. E.g.:

plt.figure()
plt.imshow(sample_image) 
plt.show()  # display it

How do I compare 2 rows from the same table (SQL Server)?

OK, after 2 years it's finally time to correct the syntax:

SELECT  t1.value, t2.value
FROM    MyTable t1
JOIN    MyTable t2
ON      t1.id = t2.id
WHERE   t1.id = @id
        AND t1.status = @status1
        AND t2.status = @status2

Regex to check whether a string contains only numbers

If you need just positive integer numbers and don't need leading zeros (e.g. "0001234" or "00"):

var reg = /^(?:[1-9]\d*|\d)$/;

Install a Nuget package in Visual Studio Code

Modify your project.json or *.csproj file. Add a dependency entry with the name of the package and the version desired.

JSON example:

{
   "dependencies" : {

     "AutoMapper": "5.2.0"
   }
}

How can I implement custom Action Bar with custom buttons in Android?

1 You can use a drawable

<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/menu_item1"
        android:icon="@drawable/my_item_drawable"
        android:title="@string/menu_item1"
        android:showAsAction="ifRoom" />
</menu>

2 Create a style for the action bar and use a custom background:

<resources>
    <!-- the theme applied to the application or activity -->
    <style name="CustomActivityTheme" parent="@android:style/Theme.Holo">
        <item name="android:actionBarStyle">@style/MyActionBar</item>
        <!-- other activity and action bar styles here -->
    </style>
    <!-- style for the action bar backgrounds -->
    <style name="MyActionBar" parent="@android:style/Widget.Holo.ActionBar">
        <item name="android:background">@drawable/background</item>
        <item name="android:backgroundStacked">@drawable/background</item>
        <item name="android:backgroundSplit">@drawable/split_background</item>
    </style>
</resources>

3 Style again android:actionBarDivider

The android documentation is very usefull for that.

How do I validate a date string format in python?

>>> import datetime
>>> def validate(date_text):
    try:
        datetime.datetime.strptime(date_text, '%Y-%m-%d')
    except ValueError:
        raise ValueError("Incorrect data format, should be YYYY-MM-DD")


>>> validate('2003-12-23')
>>> validate('2003-12-32')

Traceback (most recent call last):
  File "<pyshell#20>", line 1, in <module>
    validate('2003-12-32')
  File "<pyshell#18>", line 5, in validate
    raise ValueError("Incorrect data format, should be YYYY-MM-DD")
ValueError: Incorrect data format, should be YYYY-MM-DD

Py_Initialize fails - unable to load the file system codec

From python3k, the startup need the encodings module, which can be found in PYTHONHOME\Lib directory. In fact, the API Py_Initialize () do the init and import the encodings module. Make sure PYTHONHOME\Lib is in sys.path and check the encodings module is there.

CSS3 selector :first-of-type with class name?

This is an old thread, but I'm responding because it still appears high in the list of search results. Now that the future has arrived, you can use the :nth-child pseudo-selector.

p:nth-child(1) { color: blue; }
p.myclass1:nth-child(1) { color: red; }
p.myclass2:nth-child(1) { color: green; }

The :nth-child pseudo-selector is powerful - the parentheses accept formulas as well as numbers.

More here: https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-child

What is the size of column of int(11) in mysql in bytes?

According to here, int(11) will take 4 bytes of space that is 32 bits of space with 2^(31) = 2147483648 max value and -2147483648min value. One bit is for sign.

Replace whitespace with a comma in a text file in Linux

This worked for me.

sed -e 's/\s\+/,/g' input.txt >> output.csv

Android add placeholder text to EditText

You have to use the android:hint attribute

<EditText
android:id="@+id/message"
android:hint="<<Your placeholder>>"
/>

In Android Studio, you can switch from XML -> Design View and click on the Component in the layout, the EditText field in this case. This will show all the applicable attributes for that GUI component. This will be handy when you don't know about all the attributes that are there.

You would be surprised to see that EditText has more than 140 attributes for customization.

git recover deleted file where no commit was made after the delete

Here is the command that helped me on my mac. I tried a few of the other solutions but they did not work for me.

Git version on OSX Mavericks

mac-pro:main chris$ git version
git version 1.8.5.2 (Apple Git-48)

Command

git checkout HEAD -- path/to/file/file.cc

How to redirect verbose garbage collection output to a file?

If in addition you want to pipe the output to a separate file, you can do:

On a Sun JVM:

-Xloggc:C:\whereever\jvm.log -verbose:gc -XX:+PrintGCDateStamps

ON an IBM JVM:

-Xverbosegclog:C:\whereever\jvm.log 

The module ".dll" was loaded but the entry-point was not found

The error indicates that the DLL is either not a COM DLL or it's corrupt. If it's not a COM DLL and not being used as a COM DLL by an application then there is no need to register it.
From what you say in your question (the service is not registered) it seems that we are talking about a service not correctly installed. I will try to reinstall the application.

How to draw in JPanel? (Swing/graphics Java)

Variation of the code by Bijaya Bidari that is accepted by Java 8 without warnings in regard with overridable method calls in constructor:

public class Graph extends JFrame {
    JPanel jp;

    public Graph() {
        super("Simple Drawing");
        super.setSize(300, 300);
        super.setDefaultCloseOperation(EXIT_ON_CLOSE);

        jp = new GPanel();
        super.add(jp);
    }

    public static void main(String[] args) {
        Graph g1 = new Graph();
        g1.setVisible(true);
    }

    class GPanel extends JPanel {
        public GPanel() {
            super.setPreferredSize(new Dimension(300, 300));
        }

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            //rectangle originated at 10,10 and end at 240,240
            g.drawRect(10, 10, 240, 240);
                    //filled Rectangle with rounded corners.    
            g.fillRoundRect(50, 50, 100, 100, 80, 80);
        }
    }
}

How to use vagrant in a proxy environment?

Some Special characters in the password create problem in proxy. Either escape them or avoid having special characters in password.

What's the difference between nohup and ampersand

Using the ampersand (&) will run the command in a child process (child to the current bash session). However, when you exit the session, all child processes will be killed.

using nohup + ampersand (&) will do the same thing, except that when the session ends, the parent of the child process will be changed to "1" which is the "init" process, thus preserving the child from being killed.

Removing certain characters from a string in R

This should work

gsub('\u009c','','\u009cYes yes for ever for ever the boys ')
"Yes yes for ever for ever the boys "

Here 009c is the hexadecimal number of unicode. You must always specify 4 hexadecimal digits. If you have many , one solution is to separate them by a pipe:

gsub('\u009c|\u00F0','','\u009cYes yes \u00F0for ever for ever the boys and the girls')

"Yes yes for ever for ever the boys and the girls"

Best way to specify whitespace in a String.Split operation

If repeating the same code is the issue, write an extension method on the String class that encapsulates the splitting logic.

What is fastest children() or find() in jQuery?

This jsPerf test suggests that find() is faster. I created a more thorough test, and it still looks as though find() outperforms children().

Update: As per tvanfosson's comment, I created another test case with 16 levels of nesting. find() is only slower when finding all possible divs, but find() still outperforms children() when selecting the first level of divs.

children() begins to outperform find() when there are over 100 levels of nesting and around 4000+ divs for find() to traverse. It's a rudimentary test case, but I still think that find() is faster than children() in most cases.

I stepped through the jQuery code in Chrome Developer Tools and noticed that children() internally makes calls to sibling(), filter(), and goes through a few more regexes than find() does.

find() and children() fulfill different needs, but in the cases where find() and children() would output the same result, I would recommend using find().

JSON character encoding - is UTF-8 well-supported by browsers or should I use numeric escape sequences?

I was facing the same problem. It works for me. Please check this.

json_encode($array,JSON_UNESCAPED_UNICODE);

Mongoose limit/offset and count query

db.collection_name.aggregate([
    { '$match'    : { } },
    { '$sort'     : { '_id' : -1 } },
    { '$facet'    : {
        metadata: [ { $count: "total" } ],
        data: [ { $skip: 1 }, { $limit: 10 },{ '$project' : {"_id":0} } ] // add projection here wish you re-shape the docs
    } }
] )

Instead of using two queries to find the total count and skip the matched record.
$facet is the best and optimized way.

  1. Match the record
  2. Find total_count
  3. skip the record
  4. And also can reshape data according to our needs in the query.

How to set time zone in codeigniter?

In the application/config folder, get the file config.php and check for the below:

$config['time_reference'] = '';

Change the value to your preferred time zone. For example to set time zone to Nairobi Kenya: $config['time_reference'] = 'Africa/Nairobi';

Mapping a JDBC ResultSet to an object

I would like to hint on q2o. It is a JPA based Java object mapper which helps with many of the tedious SQL and JDBC ResultSet related tasks, but without all the complexity an ORM framework comes with. With its help mapping a ResultSet to an object is as easy as this:

while(rs.next()) {
    users.add(Q2Obj.fromResultSet(rs, User.class));
}

More about q2o can be found here.

How to run server written in js with Node.js

Just try

node server

from cmd prompt in that directory

How do I completely rename an Xcode project (i.e. inclusive of folders)?

To add to @luke-west 's excellent answer:

When using CocoaPods

After step 2:

  1. Quit XCode.
  2. In the master folder, rename OLD.xcworkspace to NEW.xcworkspace.

After step 4:

  1. In XCode: choose and edit Podfile from the project navigator. You should see a target clause with the OLD name. Change it to NEW.
  2. Quit XCode.
  3. In the project folder, delete the OLD.podspec file.
  4. rm -rf Pods/
  5. Run pod install.
  6. Open XCode.
  7. Click on your project name in the project navigator.
  8. In the main pane, switch to the Build Phases tab.
  9. Under Link Binary With Libraries, look for libPods-OLD.a and delete it.
  10. If you have an objective-c Bridging header go to Build settings and change the location of the header from OLD/OLD-Bridging-Header.h to NEW/NEW-Bridging-Header.h
  11. Clean and run.

HTTP Error 500.30 - ANCM In-Process Start Failure

This publish profile setting fixed for me:

Configure Publish Profile -> Settings -> Site Extensions Options ->

  • [x] Install ASP.NET Core Site Extension.

Can two or more people edit an Excel document at the same time?

No, sadly:

The Excel 2010 client application does not support co-authoring workbooks in SharePoint Server 2010. However, the Excel client application does support non-real-time co-authoring workbooks stored locally or on network (UNC) paths by using the Shared Workbook feature. Co-authoring workbooks in SharePoint is supported by using the Microsoft Excel Web App, included with Office Web Apps

From Co-authoring overview (SharePoint Server 2010)

...and not for SharePoint 2013 either. Though it works for pretty much all other Office documents. Go figure.

Python, Matplotlib, subplot: How to set the axis range?

If you know the exact axis you want, then

pylab.ylim([0,1000])

works as answered previously. But if you want a more flexible axis to fit your exact data, as I did when I found this question, then set axis limit to be the length of your dataset. If your dataset is fft as in the question, then add this after your plot command:

length = (len(fft)) pylab.ylim([0,length])

Get the correct week number of a given date

public int GetWeekNumber()
{
   CultureInfo ciCurr = CultureInfo.CurrentCulture;
   int weekNum = ciCurr.Calendar.GetWeekOfYear(DateTime.Now, 
   CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);
   return weekNum;
}

Update statement with inner join on Oracle

UPDATE (SELECT T.FIELD A, S.FIELD B
FROM TABLE_T T INNER JOIN TABLE_S S
ON T.ID = S.ID)
SET B = A;

A and B are alias fields, you do not need to point the table.

Using CSS to insert text

The answer using jQuery that everyone seems to like has a major flaw, which is it is not scalable (at least as it is written). I think Martin Hansen has the right idea, which is to use HTML5 data-* attributes. And you can even use the apostrophe correctly:

html:

<div class="task" data-task-owner="Joe">mop kitchen</div>
<div class="task" data-task-owner="Charles" data-apos="1">vacuum hallway</div>

css:

div.task:before { content: attr(data-task-owner)"'s task - " ; }
div.task[data-apos]:before { content: attr(data-task-owner)"' task - " ; }

output:

Joe's task - mop kitchen
Charles' task - vacuum hallway

HTML Code for text checkbox '?'

?

this is a character . You can do copy/past without problem

Default Activity not found in Android Studio

  1. Right click on the project and choose Open Module Settings.
  2. Go to the Sources tab in your module.
  3. Find your src folder.
  4. Right click on it and mark it as Sources.

This solved the error in my case.

Count all values in a matrix greater than a value

To count the number of values larger than x in any numpy array you can use:

n = len(matrix[matrix > x])

The boolean indexing returns an array that contains only the elements where the condition (matrix > x) is met. Then len() counts these values.

How to convert date format to DD-MM-YYYY in C#

Here we go:

DateTime time = DateTime.Now;
Console.WriteLine(time.Day + "-" + time.Month + "-" + time.Year);

WORKS! :)

How to read a text file into a list or an array with Python

You will have to split your string into a list of values using split()

So,

lines = text_file.read().split(',')

EDIT: I didn't realise there would be so much traction to this. Here's a more idiomatic approach.

import csv
with open('filename.csv', 'r') as fd:
    reader = csv.reader(fd)
    for row in reader:
        # do something

CORS header 'Access-Control-Allow-Origin' missing

You must have got the idea why you are getting this problem after going through above answers.

self.send_header('Access-Control-Allow-Origin', '*')

You just have to add the above line in your server side.

Write objects into file with Node.js

Just incase anyone else stumbles across this, I use the fs-extra library in node and write javascript objects to a file like this:

const fse = require('fs-extra');
fse.outputJsonSync('path/to/output/file.json', objectToWriteToFile); 

jquery .live('click') vs .click()

(Note 29/08/2017: live was deprecated many versions ago and removed in v1.9. delegate was deprecated in v3.0. In both cases, use the delegating signature of on instead [also covered below].)


live happens by capturing the event when it's bubbled all the way up the DOM to the document root, and then looking at the source element. click happens by capturing the event on the element itself. So if you're using live, and one of the ancestor elements is hooking the event directly (and preventing it continuing to bubble), you'll never see the event on your element. Whereas normally, the element nearest the event (click or whatever) gets first grab at it, the mix of live and non-live events can change that in subtle ways.

For example:

_x000D_
_x000D_
jQuery(function($) {_x000D_
_x000D_
  $('span').live('click', function() {_x000D_
    display("<tt>live</tt> caught a click!");_x000D_
  });_x000D_
_x000D_
  $('#catcher').click(function() {_x000D_
    display("Catcher caught a click and prevented <tt>live</tt> from seeing it.");_x000D_
    return false;_x000D_
  });_x000D_
_x000D_
  function display(msg) {_x000D_
    $("<p>").html(msg).appendTo(document.body);_x000D_
  }_x000D_
_x000D_
});
_x000D_
<div>_x000D_
  <span>Click me</span>_x000D_
  <span>or me</span>_x000D_
  <span>or me</span>_x000D_
  <div>_x000D_
    <span>I'm two levels in</span>_x000D_
    <span>so am I</span>_x000D_
  </div>_x000D_
  <div id='catcher'>_x000D_
    <span>I'm two levels in AND my parent interferes with <tt>live</tt></span>_x000D_
    <span>me too</span>_x000D_
  </div>_x000D_
</div>_x000D_
<!-- Using an old version because `live` was removed in v1.9 -->_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js">_x000D_
</script>
_x000D_
_x000D_
_x000D_

I'd recommend using delegate over live when you can, so you can more thoroughly control the scope; with delegate, you control the root element that captures the bubbling event (e.g., live is basically delegate using the document root as the root). Also, recommend avoiding (where possible) having delegate or live interacting with non-delegated, non-live event handling.


Here several years later, you wouldn't use either live or delegate; you'd use the delegating signature of on, but the concept is still the same: The event is hooked on the element you call on on, but then fired only when descendants match the selector given after the event name:

_x000D_
_x000D_
jQuery(function($) {_x000D_
_x000D_
  $(document).on('click', 'span', function() {_x000D_
    display("<tt>live</tt> caught a click!");_x000D_
  });_x000D_
_x000D_
  $('#catcher').click(function() {_x000D_
    display("Catcher caught a click and prevented <tt>live</tt> from seeing it.");_x000D_
    return false;_x000D_
  });_x000D_
_x000D_
  function display(msg) {_x000D_
    $("<p>").html(msg).appendTo(document.body);_x000D_
  }_x000D_
_x000D_
});
_x000D_
<div>_x000D_
  <span>Click me</span>_x000D_
  <span>or me</span>_x000D_
  <span>or me</span>_x000D_
  <div>_x000D_
    <span>I'm two levels in</span>_x000D_
    <span>so am I</span>_x000D_
  </div>_x000D_
  <div id='catcher'>_x000D_
    <span>I'm two levels in AND my parent interferes with <tt>live</tt></span>_x000D_
    <span>me too</span>_x000D_
  </div>_x000D_
</div>_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
_x000D_
_x000D_
_x000D_

PNG transparency issue in IE8

I use a CSS fix rather than JS to workaround my round cornered layer with transparent PNG inside

Try

.ie .whateverDivWrappingTheImage img {
background: #ffaabb; /* this should be the background color matching your design actually */
filter: chroma(#ffaabb); /* and this should match whatever value you put in background-color */
}

This may require more work on ie9 or later.

How to automatically add user account AND password with a Bash script?

For RedHat / CentOS here's the code that creates a user, adds the passwords and makes the user a sudoer:

#!/bin/sh
echo -n "Enter username: "
read uname

echo -n "Enter password: "
read -s passwd

adduser "$uname"
echo $uname:$passwd | sudo chpasswd

gpasswd wheel -a $uname

Regex, every non-alphanumeric character except white space or colon

In JavaScript:

/[^\w_]/g

^ negation, i.e. select anything not in the following set

\w any word character (i.e. any alphanumeric character, plus underscore)

_ negate the underscore, as it's considered a 'word' character

Usage example - const nonAlphaNumericChars = /[^\w_]/g;

Meaning of .Cells(.Rows.Count,"A").End(xlUp).row

.Cells(.Rows.Count,"A").End(xlUp).row

I think the first dot in the parenthesis should not be there, I mean, you should write it in this way:

.Cells(Rows.Count,"A").End(xlUp).row

Before the Cells, you can write your worksheet name, for example:

Worksheets("sheet1").Cells(Rows.Count, 2).End(xlUp).row

The worksheet name is not necessary when you operate on the same worksheet.

how to start stop tomcat server using CMD?

Add %CATALINA_HOME%/bin to path system variable.

Go to Environment Variables screen under System Variables there will be a Path variable edit the variable and add ;%CATALINA_HOME%\bin to the variable then click OK to save the changes. Close all opened command prompts then open a new command prompt and try to use the command startup.bat.

How to create an empty matrix in R?

If you don't know the number of columns ahead of time, add each column to a list and cbind at the end.

List <- list()
for(i in 1:n)
{
    normF <- #something
    List[[i]] <- normF
}
Matrix = do.call(cbind, List)

Activity has leaked window that was originally added

I have another solution for this, and would like to know if it seems valid to you: instead of dismissing in the onDestroy, which seems to be the leading solution, I'm extending ProgressDialog...

public class MyProgressDialog extends ProgressDialog {

  private boolean isDismissed;

  public MyProgressDialog(Context context) {
    super(context);
  }

  @Override
  public void onDetachedFromWindow() {
    super.onDetachedFromWindow();
    dismiss();
  }

  @Override
  public void dismiss() {
    if (isDismissed) {
      return;
    }
    try {
      super.dismiss();
    } catch (IllegalArgumentException e) {
      // ignore
    }
    isDismissed = true;
  }

This is preferable, AFAIC, because you don't have to hold the progress dialog as a member, just fire(show) and forget

Ruby: How to post a file via HTTP as multipart/form-data?

curb looks like a great solution, but in case it doesn't meet your needs, you can do it with Net::HTTP. A multipart form post is just a carefully-formatted string with some extra headers. It seems like every Ruby programmer who needs to do multipart posts ends up writing their own little library for it, which makes me wonder why this functionality isn't built-in. Maybe it is... Anyway, for your reading pleasure, I'll go ahead and give my solution here. This code is based off of examples I found on a couple of blogs, but I regret that I can't find the links anymore. So I guess I just have to take all the credit for myself...

The module I wrote for this contains one public class, for generating the form data and headers out of a hash of String and File objects. So for example, if you wanted to post a form with a string parameter named "title" and a file parameter named "document", you would do the following:

#prepare the query
data, headers = Multipart::Post.prepare_query("title" => my_string, "document" => my_file)

Then you just do a normal POST with Net::HTTP:

http = Net::HTTP.new(upload_uri.host, upload_uri.port)
res = http.start {|con| con.post(upload_uri.path, data, headers) }

Or however else you want to do the POST. The point is that Multipart returns the data and headers that you need to send. And that's it! Simple, right? Here's the code for the Multipart module (you need the mime-types gem):

# Takes a hash of string and file parameters and returns a string of text
# formatted to be sent as a multipart form post.
#
# Author:: Cody Brimhall <mailto:[email protected]>
# Created:: 22 Feb 2008
# License:: Distributed under the terms of the WTFPL (http://www.wtfpl.net/txt/copying/)

require 'rubygems'
require 'mime/types'
require 'cgi'


module Multipart
  VERSION = "1.0.0"

  # Formats a given hash as a multipart form post
  # If a hash value responds to :string or :read messages, then it is
  # interpreted as a file and processed accordingly; otherwise, it is assumed
  # to be a string
  class Post
    # We have to pretend we're a web browser...
    USERAGENT = "Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-us) AppleWebKit/523.10.6 (KHTML, like Gecko) Version/3.0.4 Safari/523.10.6"
    BOUNDARY = "0123456789ABLEWASIEREISAWELBA9876543210"
    CONTENT_TYPE = "multipart/form-data; boundary=#{ BOUNDARY }"
    HEADER = { "Content-Type" => CONTENT_TYPE, "User-Agent" => USERAGENT }

    def self.prepare_query(params)
      fp = []

      params.each do |k, v|
        # Are we trying to make a file parameter?
        if v.respond_to?(:path) and v.respond_to?(:read) then
          fp.push(FileParam.new(k, v.path, v.read))
        # We must be trying to make a regular parameter
        else
          fp.push(StringParam.new(k, v))
        end
      end

      # Assemble the request body using the special multipart format
      query = fp.collect {|p| "--" + BOUNDARY + "\r\n" + p.to_multipart }.join("") + "--" + BOUNDARY + "--"
      return query, HEADER
    end
  end

  private

  # Formats a basic string key/value pair for inclusion with a multipart post
  class StringParam
    attr_accessor :k, :v

    def initialize(k, v)
      @k = k
      @v = v
    end

    def to_multipart
      return "Content-Disposition: form-data; name=\"#{CGI::escape(k)}\"\r\n\r\n#{v}\r\n"
    end
  end

  # Formats the contents of a file or string for inclusion with a multipart
  # form post
  class FileParam
    attr_accessor :k, :filename, :content

    def initialize(k, filename, content)
      @k = k
      @filename = filename
      @content = content
    end

    def to_multipart
      # If we can tell the possible mime-type from the filename, use the
      # first in the list; otherwise, use "application/octet-stream"
      mime_type = MIME::Types.type_for(filename)[0] || MIME::Types["application/octet-stream"][0]
      return "Content-Disposition: form-data; name=\"#{CGI::escape(k)}\"; filename=\"#{ filename }\"\r\n" +
             "Content-Type: #{ mime_type.simplified }\r\n\r\n#{ content }\r\n"
    end
  end
end

How do I get the old value of a changed cell in Excel VBA?

Just a thought, but Have you tried using application.undo

This will set the values back again. You can then simply read the original value. It should not be too difficult to store the new values first, so you change them back again if you like.

Where is body in a nodejs http.get response?

A portion of Coffee here:

# My little helper
read_buffer = (buffer, callback) ->
  data = ''
  buffer.on 'readable', -> data += buffer.read().toString()
  buffer.on 'end', -> callback data

# So request looks like
http.get 'http://i.want.some/stuff', (res) ->
  read_buffer res, (response) ->
    # Do some things with your response
    # but don't do that exactly :D
    eval(CoffeeScript.compile response, bare: true)

And compiled

var read_buffer;

read_buffer = function(buffer, callback) {
  var data;
  data = '';
  buffer.on('readable', function() {
    return data += buffer.read().toString();
  });
  return buffer.on('end', function() {
    return callback(data);
  });
};

http.get('http://i.want.some/stuff', function(res) {
  return read_buffer(res, function(response) {
    return eval(CoffeeScript.compile(response, {
      bare: true
    }));
  });
});

How to use both onclick and target="_blank"

onclick="window.open('your_html', '_blank')"

Rotate and translate

Something that may get missed: in my chaining project, it turns out a space separated list also needs a space separated semicolon at the end.

In other words, this doesn't work:

transform: translate(50%, 50%) rotate(90deg);

but this does:

transform: translate(50%, 50%) rotate(90deg) ; //has a space before ";"

How to validate inputs dynamically created using ng-repeat, ng-show (angular)

Since the question was asked the Angular team has solved this issue by making it possible to dynamically create input names.

With Angular version 1.3 and later you can now do this:

<form name="vm.myForm" novalidate>
  <div ng-repeat="p in vm.persons">
    <input type="text" name="person_{{$index}}" ng-model="p" required>
    <span ng-show="vm.myForm['person_' + $index].$invalid">Enter a name</span>
  </div>
</form>

Demo

Angular 1.3 also introduced ngMessages, a more powerful tool for form validation. You can use the same technique with ngMessages:

<form name="vm.myFormNgMsg" novalidate>
    <div ng-repeat="p in vm.persons">
      <input type="text" name="person_{{$index}}" ng-model="p" required>
      <span ng-messages="vm.myFormNgMsg['person_' + $index].$error">
        <span ng-message="required">Enter a name</span>
      </span>
    </div>
  </form>

jQuery : select all element with custom attribute

As described by the link I've given in comment, this

$('p[MyTag]').each(function(index) {
  document.write(index + ': ' + $(this).text() + "<br>");});

works (playable example).

jQuery 'if .change() or .keyup()'

Write a single function and call it for both of them.

function yourHandler(e){
    alert( 'something happened!' );        
}
jQuery(':input').change(yourHandler).keyup(yourHandler);

The change() and keyup() event registration functions return the original set, so they can be chained.

Can I obtain method parameter name using Java reflection?

So you should be able to do:

Whatever.declaredMethods
        .find { it.name == 'aMethod' }
        .parameters
        .collect { "$it.type : $it.name" }

But you'll probably get a list like so:

["int : arg0"]

I believe this will be fixed in Groovy 2.5+

So currently, the answer is:

  • If it's a Groovy class, then no, you can't get the name, but you should be able to in the future.
  • If it's a Java class compiled under Java 8, you should be able to.

See also:


For every method, then something like:

Whatever.declaredMethods
        .findAll { !it.synthetic }
        .collect { method -> 
            println method
            method.name + " -> " + method.parameters.collect { "[$it.type : $it.name]" }.join(';')
        }
        .each {
            println it
        }

How to replace (null) values with 0 output in PIVOT

You cannot place the IsNull() until after the data is selected so you will place the IsNull() around the final value in the SELECT:

SELECT CLASS,
  IsNull([AZ], 0) as [AZ],
  IsNull([CA], 0) as [CA],
  IsNull([TX], 0) as [TX]
FROM #TEMP
PIVOT 
(
  SUM(DATA)
  FOR STATE IN ([AZ], [CA], [TX])
) AS PVT
ORDER BY CLASS

Maximum length of HTTP GET request

A similar question is here: Is there a limit to the length of a GET request?

I've hit the limit and on my shared hosting account, but the browser returned a blank page before it got to the server I think.

Python interpreter error, x takes no arguments (1 given)

I have been puzzled a lot with this problem, since I am relively new in Python. I cannot apply the solution to the code given by the questioned, since it's not self executable. So I bring a very simple code:

from turtle import *

ts = Screen(); tu = Turtle()

def move(x,y):
  print "move()"
  tu.goto(100,100)

ts.listen();
ts.onclick(move)

done()

As you can see, the solution consists in using two (dummy) arguments, even if they are not used either by the function itself or in calling it! It sounds crazy, but I believe there must be a reason for it (hidden from the novice!).

I have tried a lot of other ways ('self' included). It's the only one that works (for me, at least).

Remove all spaces from a string in SQL Server

Reference taken from this blog:

First, Create sample table and data:

CREATE TABLE tbl_RemoveExtraSpaces
(
     Rno INT
     ,Name VARCHAR(100)
)
GO

INSERT INTO tbl_RemoveExtraSpaces VALUES (1,'I    am     Anvesh   Patel')
INSERT INTO tbl_RemoveExtraSpaces VALUES (2,'Database   Research and     Development  ')
INSERT INTO tbl_RemoveExtraSpaces VALUES (3,'Database    Administrator     ')
INSERT INTO tbl_RemoveExtraSpaces VALUES (4,'Learning    BIGDATA    and       NOSQL ')
GO

Script to SELECT string without Extra Spaces:

SELECT
     [Rno]
    ,[Name] AS StringWithSpace
    ,LTRIM(RTRIM(REPLACE(REPLACE(REPLACE([Name],CHAR(32),'()'),')(',''),'()',CHAR(32)))) AS StringWithoutSpace
FROM tbl_RemoveExtraSpaces

Result:

Rno         StringWithSpace                                 StringWithoutSpace
----------- -----------------------------------------  ---------------------------------------------
1           I    am     Anvesh   Patel                      I am Anvesh Patel
2           Database   Research and     Development         Database Research and Development
3           Database    Administrator                       Database Administrator
4           Learning    BIGDATA    and       NOSQL          Learning BIGDATA and NOSQL

Use latest version of Internet Explorer in the webbrowser control

You can try this link

try
{
    var IEVAlue =  9000; // can be: 9999 , 9000, 8888, 8000, 7000
    var targetApplication = Processes.getCurrentProcessName() + ".exe"; 
    var localMachine = Registry.LocalMachine;
    var parentKeyLocation = @"SOFTWARE\Microsoft\Internet Explorer\MAIN\FeatureControl";
    var keyName = "FEATURE_BROWSER_EMULATION";
    "opening up Key: {0} at {1}".info(keyName, parentKeyLocation);
    var subKey = localMachine.getOrCreateSubKey(parentKeyLocation,keyName,true);
    subKey.SetValue(targetApplication, IEVAlue,RegistryValueKind.DWord);
    return "all done, now try it on a new process".info();
}
catch(Exception ex)
{
    ex.log();
    "NOTE: you need to run this under no UAC".info();
}

Axios having CORS issue

CORS issue can be simply resolved by following this:

Create a new shortcut of Google Chrome(update browser installation path accordingly) with following value:

"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe" --disable-web-security --user-data-dir="D:\chrome\temp"

How to make an HTTP POST web request

MSDN has a sample.

using System;
using System.IO;
using System.Net;
using System.Text;

namespace Examples.System.Net
{
    public class WebRequestPostExample
    {
        public static void Main()
        {
            // Create a request using a URL that can receive a post. 
            WebRequest request = WebRequest.Create("http://www.contoso.com/PostAccepter.aspx");
            // Set the Method property of the request to POST.
            request.Method = "POST";
            // Create POST data and convert it to a byte array.
            string postData = "This is a test that posts this string to a Web server.";
            byte[] byteArray = Encoding.UTF8.GetBytes(postData);
            // Set the ContentType property of the WebRequest.
            request.ContentType = "application/x-www-form-urlencoded";
            // Set the ContentLength property of the WebRequest.
            request.ContentLength = byteArray.Length;
            // Get the request stream.
            Stream dataStream = request.GetRequestStream();
            // Write the data to the request stream.
            dataStream.Write(byteArray, 0, byteArray.Length);
            // Close the Stream object.
            dataStream.Close();
            // Get the response.
            WebResponse response = request.GetResponse();
            // Display the status.
            Console.WriteLine(((HttpWebResponse)response).StatusDescription);
            // Get the stream containing content returned by the server.
            dataStream = response.GetResponseStream();
            // Open the stream using a StreamReader for easy access.
            StreamReader reader = new StreamReader(dataStream);
            // Read the content.
            string responseFromServer = reader.ReadToEnd();
            // Display the content.
            Console.WriteLine(responseFromServer);
            // Clean up the streams.
            reader.Close();
            dataStream.Close();
            response.Close();
        }
    }
}

Remove duplicated rows

You can also use dplyr's distinct() function! It tends to be more efficient than alternative options, especially if you have loads of observations.

distinct_data <- dplyr::distinct(yourdata)

How do you underline a text in Android XML?

Another way to do it, is creating a custom component extending TextView. It's good for cases where you need to have multiple underlined TextViews.

Here's the code for the component:

package com.myapp.components;

import android.content.Context;
import android.support.v7.widget.AppCompatTextView;
import android.text.SpannableString;
import android.text.style.UnderlineSpan;
import android.util.AttributeSet;

public class LinkTextView extends AppCompatTextView {
    public LinkTextView(Context context) {
        this(context, null);
    }

    public LinkTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public void setText(CharSequence text, BufferType type) {
        SpannableString content = new SpannableString(text);
        content.setSpan(new UnderlineSpan(), 0, content.length(), 0);

        super.setText(content, type);
    }
}

And how to use it in xml:

<com.myapp.components.LinkTextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Hello World!" />

How to export data to an excel file using PHPExcel

Work 100%. maybe not relation to creator answer but i share it for users have a problem with export mysql query to excel with phpexcel. Good Luck.

require('../phpexcel/PHPExcel.php');

require('../phpexcel/PHPExcel/Writer/Excel5.php');

$filename = 'userReport'; //your file name

    $objPHPExcel = new PHPExcel();
    /*********************Add column headings START**********************/
    $objPHPExcel->setActiveSheetIndex(0)
                ->setCellValue('A1', 'username')
                ->setCellValue('B1', 'city_name');

    /*********************Add data entries START**********************/
//get_result_array_from_class**You can replace your sql code with this line.
$result = $get_report_clas->get_user_report();
//set variable for count table fields.
$num_row = 1;
foreach ($result as $value) {
  $user_name = $value['username'];
  $c_code = $value['city_name'];
  $num_row++;
        $objPHPExcel->setActiveSheetIndex(0)
                ->setCellValue('A'.$num_row, $user_name )
                ->setCellValue('B'.$num_row, $c_code );
}

    /*********************Autoresize column width depending upon contents START**********************/
    foreach(range('A','B') as $columnID) {
        $objPHPExcel->getActiveSheet()->getColumnDimension($columnID)->setAutoSize(true);
    }
    $objPHPExcel->getActiveSheet()->getStyle('A1:B1')->getFont()->setBold(true);



//Make heading font bold

        /*********************Add color to heading START**********************/
        $objPHPExcel->getActiveSheet()
                    ->getStyle('A1:B1')
                    ->getFill()
                    ->setFillType(PHPExcel_Style_Fill::FILL_SOLID)
                    ->getStartColor()
                    ->setARGB('99ff99');

        $objPHPExcel->getActiveSheet()->setTitle('userReport'); //give title to sheet
        $objPHPExcel->setActiveSheetIndex(0);
        header('Content-Type: application/vnd.ms-excel');
        header("Content-Disposition: attachment;Filename=$filename.xls");
        header('Cache-Control: max-age=0');
        $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
        $objWriter->save('php://output');

javascript close current window

** Update **

Since posting the answer the latest versions of browsers prevent the command from working. I'll leave the answer visible but note it ONLY works on older browser versions.


Most browsers prevent you from closing windows with javascript that were not opened with window.open("https://example_url.com") however, it is still possible to close the current window using the following command:

window.open('','_self').close()

This loads a blank url (the first argument) in the current window (the second argument) and then instantaneously closes the window. This works because when close() is called, the current window has been opened by javascript.

In git, what is the difference between merge --squash and rebase?

Merge squash merges a tree (a sequence of commits) into a single commit. That is, it squashes all changes made in n commits into a single commit.

Rebasing is re-basing, that is, choosing a new base (parent commit) for a tree. Maybe the mercurial term for this is more clear: they call it transplant because it's just that: picking a new ground (parent commit, root) for a tree.

When doing an interactive rebase, you're given the option to either squash, pick, edit or skip the commits you are going to rebase.

Hope that was clear!

What's causing my java.net.SocketException: Connection reset?

This error occurs on the server side when the client closed the socket connection before the response could be returned over the socket. In a web app scenario not all of these are dangerous, since they can be created manually. For example, by quitting the browser before the reponse was retrieved.

Aligning a button to the center

You should use something like this:

<div style="text-align:center">  
    <input type="submit" />  
</div>  

Or you could use something like this. By giving the element a width and specifying auto for the left and right margins the element will center itself in its parent.

<input type="submit" style="width: 300px; margin: 0 auto;" />

How do I encode/decode HTML entities in Ruby?

I think Nokogiri gem is also a good choice. It is very stable and has a huge contributing community.

Samples:

a = Nokogiri::HTML.parse "foo&nbsp;b&auml;r"    
a.text 
=> "foo bär"

or

a = Nokogiri::HTML.parse "&iexcl;I&#39;m highly&nbsp;annoyed with character references!"
a.text
=> "¡I'm highly annoyed with character references!"

TypeError: 'float' object not iterable

for i in count: means for i in 7:, which won't work. The bit after the in should be of an iterable type, not a number. Try this:

for i in range(count):

LEFT function in Oracle

I've discovered that LEFT and RIGHT are not supported functions in Oracle. They are used in SQL Server, MySQL, and some other versions of SQL. In Oracle, you need to use the SUBSTR function. Here are simple examples:

LEFT ('Data', 2) = 'Da'

->   SUBSTR('Data',1,2) = 'Da'

RIGHT ('Data', 2) = 'ta'

->   SUBSTR('Data',-2,2) = 'ta'

Notice that a negative number counts back from the end.

POST request send json data java HttpUrlConnection

the correct answer is good , but

OutputStreamWriter wr= new OutputStreamWriter(con.getOutputStream());
wr.write(parent.toString());

not work for me , instead of it , use :

byte[] outputBytes = rootJsonObject.getBytes("UTF-8");
OutputStream os = con.getOutputStream();
os.write(outputBytes);

Choosing the correct upper and lower HSV boundaries for color detection with`cv::inRange` (OpenCV)

Here's a simple HSV color thresholder script to determine the lower/upper color ranges using trackbars for any image on the disk. Simply change the image path in cv2.imread()

enter image description here

import cv2
import numpy as np

def nothing(x):
    pass

# Load image
image = cv2.imread('1.jpg')

# Create a window
cv2.namedWindow('image')

# Create trackbars for color change
# Hue is from 0-179 for Opencv
cv2.createTrackbar('HMin', 'image', 0, 179, nothing)
cv2.createTrackbar('SMin', 'image', 0, 255, nothing)
cv2.createTrackbar('VMin', 'image', 0, 255, nothing)
cv2.createTrackbar('HMax', 'image', 0, 179, nothing)
cv2.createTrackbar('SMax', 'image', 0, 255, nothing)
cv2.createTrackbar('VMax', 'image', 0, 255, nothing)

# Set default value for Max HSV trackbars
cv2.setTrackbarPos('HMax', 'image', 179)
cv2.setTrackbarPos('SMax', 'image', 255)
cv2.setTrackbarPos('VMax', 'image', 255)

# Initialize HSV min/max values
hMin = sMin = vMin = hMax = sMax = vMax = 0
phMin = psMin = pvMin = phMax = psMax = pvMax = 0

while(1):
    # Get current positions of all trackbars
    hMin = cv2.getTrackbarPos('HMin', 'image')
    sMin = cv2.getTrackbarPos('SMin', 'image')
    vMin = cv2.getTrackbarPos('VMin', 'image')
    hMax = cv2.getTrackbarPos('HMax', 'image')
    sMax = cv2.getTrackbarPos('SMax', 'image')
    vMax = cv2.getTrackbarPos('VMax', 'image')

    # Set minimum and maximum HSV values to display
    lower = np.array([hMin, sMin, vMin])
    upper = np.array([hMax, sMax, vMax])

    # Convert to HSV format and color threshold
    hsv = cv2.cvtColor(image, cv2.COLOR_BGR2HSV)
    mask = cv2.inRange(hsv, lower, upper)
    result = cv2.bitwise_and(image, image, mask=mask)

    # Print if there is a change in HSV value
    if((phMin != hMin) | (psMin != sMin) | (pvMin != vMin) | (phMax != hMax) | (psMax != sMax) | (pvMax != vMax) ):
        print("(hMin = %d , sMin = %d, vMin = %d), (hMax = %d , sMax = %d, vMax = %d)" % (hMin , sMin , vMin, hMax, sMax , vMax))
        phMin = hMin
        psMin = sMin
        pvMin = vMin
        phMax = hMax
        psMax = sMax
        pvMax = vMax

    # Display result image
    cv2.imshow('image', result)
    if cv2.waitKey(10) & 0xFF == ord('q'):
        break

cv2.destroyAllWindows()

CSS3 Box Shadow on Top, Left, and Right Only

use the spread value...

box-shadow has the following values

box-shadow: x y blur spread color;

so you could use something like..

box-shadow: 0px -10px 10px -10px black;

UPDATE: i'm adding a jsfiddle

'tsc command not found' in compiling typescript

I had to do this:

npx tsc app.ts

Display JSON as HTML

SyntaxHighlighter is a fully functional self-contained code syntax highlighter developed in JavaScript. To get an idea of what SyntaxHighlighter is capable of, have a look at the demo page.

ASP.NET: HTTP Error 500.19 – Internal Server Error 0x8007000d

Kind of late to the party here, but I have just been struggling with the exact same issue (symptoms) and cursing the lack of error detail reporting. It worked fine on IIS 8+ machines but Win 7 got these INSTANT HTTP 500.19 errors. For me it was as silly as having an unsupported configuration element in the config file:

 <applicationInitialization doAppInitAfterRestart="true">
  <add initializationPage="/" />
</applicationInitialization>

So while running old web.config files worked fine, I just diffed them and started chopping away at new blocks until I got the page to start loading. Had I seen this as an answer I would have gone this route immediately as I knew none of the popular solutions were relevant. So there you go :)

Getting JSONObject from JSONArray

start from

JSONArray deletedtrs_array = sync_reponse.getJSONArray("deletedtrs");

you can iterate through JSONArray and use values directly or create Objects of your own type
which will handle data fields inside of each deletedtrs_array member

Iterating

for(int i = 0; i < deletedtrs_array.length(); i++){
    JSONObject obj = deletedtrs_array.getJSONObject(i);
    Log.d("Item no."+i, obj.toString());

    // create object of type DeletedTrsWrapper like this
    DeletedTrsWrapper dtw = new DeletedTrsWrapper(obj);

    // String company_id = obj.getString("companyid");
    // String username = obj.getString("username");
    // String date = obj.getString("date");
    // int report_id = obj.getInt("reportid");
}

Own object type

class DeletedTrsWrapper {

    public String company_id;
    public String username;
    public String date;
    public int report_id;

    public DeletedTrsWrapper(JSONObject obj){
        company_id = obj.getString("companyid");
        username = obj.getString("username");
        date = obj.getString("date");
        report_id = obj.getInt("reportid");
    }
}

apache server reached MaxClients setting, consider raising the MaxClients setting

I recommend to use bellow formula suggested on Apache:

MaxClients = (total RAM - RAM for OS - RAM for external programs) / (RAM per httpd process)

Find my script here which is running on Rhel 6.7. you can made change according to your OS.

#!/bin/bash

echo "HostName=`hostname`"

#Formula
#MaxClients . (RAM - size_all_other_processes)/(size_apache_process)
total_httpd_processes_size=`ps -ylC httpd --sort:rss | awk '{ sum += $9 } END { print sum }'`
#echo "total_httpd_processes_size=$total_httpd_processes_size"
total_http_processes_count=`ps -ylC httpd --sort:rss | wc -l`
echo "total_http_processes_count=$total_http_processes_count"
AVG_httpd_process_size=$(expr $total_httpd_processes_size / $total_http_processes_count)
echo "AVG_httpd_process_size=$AVG_httpd_process_size"
total_httpd_process_size_MB=$(expr $AVG_httpd_process_size / 1024)
echo "total_httpd_process_size_MB=$total_httpd_process_size_MB"
total_pttpd_used_size=$(expr $total_httpd_processes_size / 1024)
echo "total_pttpd_used_size=$total_pttpd_used_size"
total_RAM_size=`free -m |grep Mem |awk '{print $2}'`
echo "total_RAM_size=$total_RAM_size"
total_used_size=`free -m |grep Mem |awk '{print $3}'`
echo "total_used_size=$total_used_size"
size_all_other_processes=$(expr $total_used_size - $total_pttpd_used_size)
echo "size_all_other_processes=$size_all_other_processes"
remaining_memory=$(($total_RAM_size - $size_all_other_processes))
echo "remaining_memory=$remaining_memory"
MaxClients=$((($total_RAM_size - $size_all_other_processes) / $total_httpd_process_size_MB))
echo "MaxClients=$MaxClients"
exit

How to set background color of a View

try to add:

setBackgroundColor(Color.parseColor("#FF0000"));

Polling the keyboard (detect a keypress) in python

Ok, since my attempt to post my solution in a comment failed, here's what I was trying to say. I could do exactly what I wanted from native Python (on Windows, not anywhere else though) with the following code:

import msvcrt 

def kbfunc(): 
   x = msvcrt.kbhit()
   if x: 
      ret = ord(msvcrt.getch()) 
   else: 
      ret = 0 
   return ret

Determining if an Object is of primitive type

You have to deal with the auto-boxing of java.
Let's take the code

public class test
{
    public static void main(String [ ] args)
    {
        int i = 3;
        Object o = i;
        return;
    }
}
You get the class test.class and javap -c test let's you inspect the generated bytecode.
Compiled from "test.java"
public class test extends java.lang.Object{
public test();
  Code:
   0:   aload_0
   1:   invokespecial   #1; //Method java/lang/Object."":()V
   4:   return

public static void main(java.lang.String[]); Code: 0: iconst_3 1: istore_1 2: iload_1 3: invokestatic #2; //Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer; 6: astore_2 7: return

}

As you can see the java compiler added
invokestatic    #2; //Method java/lang/Integer.valueOf:(I)Ljava/lang/Integer;
to create a new Integer from your int and then stores that new Object in o via astore_2

How to config Tomcat to serve images from an external folder outside webapps?

Many years later, we can do the following with Spring Web MVC, inside our webapp-servlet.xml file:

<mvc:resources mapping="/static/**" location="/static/" />

How to find SQL Server running port?

SQL Server 2000 Programs | MS SQL Server | Client Network Utility | Select TCP_IP then Properties

SQL Server 2005 Programs | SQL Server | SQL Server Configuration Manager | Select Protocols for MSSQLSERVER or select Client Protocols and right click on TCP/IP

C++ error 'Undefined reference to Class::Function()'

What are you using to compile this? If there's an undefined reference error, usually it's because the .o file (which gets created from the .cpp file) doesn't exist and your compiler/build system is not able to link it.

Also, in your card.cpp, the function should be Card::Card() instead of void Card. The Card:: is scoping; it means that your Card() function is a member of the Card class (which it obviously is, since it's the constructor for that class). Without this, void Card is just a free function. Similarly,

void Card(Card::Rank rank, Card::Suit suit)

should be

Card::Card(Card::Rank rank, Card::Suit suit)

Also, in deck.cpp, you are saying #include "Deck.h" even though you referred to it as deck.h. The includes are case sensitive.

Convert a Unicode string to an escaped ASCII string

As a one-liner:

var result = Regex.Replace(input, @"[^\x00-\x7F]", c => 
    string.Format(@"\u{0:x4}", (int)c.Value[0]));

How to access child's state in React?

Its 2020 and lots of you will come here looking for a similar solution but with Hooks ( They are great! ) and with latest approaches in terms of code cleanliness and syntax.

So as previous answers had stated, the best approach to this kind of problem is to hold the state outside of child component fieldEditor. You could do that in multiple ways.

The most "complex" is with global context (state) that both parent and children could access and modify. Its a great solution when components are very deep in the tree hierarchy and so its costly to send props in each level.

In this case I think its not worth it, and more simple approach will bring us the results we want, just using the powerful React.useState().

Approach with React.useState() hook, way simpler than with Class components

As said we will deal with changes and store the data of our child component fieldEditor in our parent fieldForm. To do that we will send a reference to the function that will deal and apply the changes to the fieldForm state, you could do that with:

function FieldForm({ fields }) {
  const [fieldsValues, setFieldsValues] = React.useState({});
  const handleChange = (event, fieldId) => {
    let newFields = { ...fieldsValues };
    newFields[fieldId] = event.target.value;

    setFieldsValues(newFields);
  };

  return (
    <div>
      {fields.map(field => (
        <FieldEditor
          key={field}
          id={field}
          handleChange={handleChange}
          value={fieldsValues[field]}
        />
      ))}
      <div>{JSON.stringify(fieldsValues)}</div>
    </div>
  );
}

Note that React.useState({}) will return an array with position 0 being the value specified on call (Empty object in this case), and position 1 being the reference to the function that modifies the value.

Now with the child component, FieldEditor, you don't even need to create a function with a return statement, a lean constant with an arrow function will do!

const FieldEditor = ({ id, value, handleChange }) => (
  <div className="field-editor">
    <input onChange={event => handleChange(event, id)} value={value} />
  </div>
);

Aaaaand we are done, nothing more, with just these two slime functional components we have our end goal "access" our child FieldEditor value and show it off in our parent.

You could check the accepted answer from 5 years ago and see how Hooks made React code leaner (By a lot!).

Hope my answer helps you learn and understand more about Hooks, and if you want to check a working example here it is.

How to reference image resources in XAML?

  1. Add folders to your project and add images to these through "Existing Item".
  2. XAML similar to this: <Image Source="MyRessourceDir\images\addButton.png"/>
  3. F6 (Build)

Passing html values into javascript functions

Here is the JSfiddle Demo

I changed your HTML and give your input textfield an id of value. I removed the passed param for your verifyorder function, and instead grab the content of your textfield by using document.getElementById(); then i convert the str into value with +order so you can check if it's greater than zero:

<input type="text" maxlength="3" name="value" id='value' />
<input type="button" value="submit" onclick="verifyorder()" />
</p>
<p id="error"></p>
<p id="detspace"></p> 

function verifyorder() {
        var order = document.getElementById('value').value;
        if (+order > 0) {
            alert(+order);
            return true;
        }
        else {
            alert("Sorry, you need to enter a positive integer value, try again");
            document.getElementById('error').innerHTML = "Sorry, you need to enter a positive integer value, try again";
        }
    }

Read a javascript cookie by name

using jquery-cookie

I find this library helpful. 3.128 kb of pure convenience.

add script

<script src="/path/to/jquery.cookie.js"></script>

set cookie

$.cookie('name', 'value');

read cookie

$.cookie('name');

CSS - center two images in css side by side

You can't have two elements with the same ID.

Aside from that, you are defining them as block elemnts, meaning (in layman's terms) that they are being forced to appear on their own line.

Instead, try something like this:

<div class="link"><a href="..."><img src="..."... /></a></div>
<div class="link"><a href="..."><img src="..."... /></a></div>

CSS:

.link {
    width: 50%;
    float: left;
    text-align: center;
}

Increasing the maximum post size

We can Increasing the maximum limit using .htaccess file.

php_value session.gc_maxlifetime 10800
php_value max_input_time         10800
php_value max_execution_time     10800
php_value upload_max_filesize    110M
php_value post_max_size          120M

If sometimes other way are not working, this way is working perfect.

How to write a file or data to an S3 object using boto3

A cleaner and concise version which I use to upload files on the fly to a given S3 bucket and sub-folder-

import boto3

BUCKET_NAME = 'sample_bucket_name'
PREFIX = 'sub-folder/'

s3 = boto3.resource('s3')

# Creating an empty file called "_DONE" and putting it in the S3 bucket
s3.Object(BUCKET_NAME, PREFIX + '_DONE').put(Body="")

Note: You should ALWAYS put your AWS credentials (aws_access_key_id and aws_secret_access_key) in a separate file, for example- ~/.aws/credentials

CSS Transition doesn't work with top, bottom, left, right

Something that is not relevant for the OP, but maybe for someone else in the future:

For pixels (px), if the value is "0", the unit can be omitted: right: 0 and right: 0px both work.

However I noticed that in Firefox and Chrome this is not the case for the seconds unit (s). While transition: right 1s ease 0s works, transition: right 1s ease 0 (missing unit s for last value transition-delay) does not (it does work in Edge however).

In the following example, you'll see that right works for both 0px and 0, but transition only works for 0s and it doesn't work with 0.

_x000D_
_x000D_
#box {_x000D_
    border: 1px solid black;_x000D_
    height: 240px;_x000D_
    width: 260px;_x000D_
    margin: 50px;_x000D_
    position: relative;_x000D_
}_x000D_
.jump {_x000D_
    position: absolute;_x000D_
    width: 200px;_x000D_
    height: 50px;_x000D_
    color: white;_x000D_
    padding: 5px;_x000D_
}_x000D_
#jump1 {_x000D_
    background-color: maroon;_x000D_
    top: 0px;_x000D_
    right: 0px;_x000D_
    transition: right 1s ease 0s;_x000D_
}_x000D_
#jump2 {_x000D_
    background-color: green;_x000D_
    top: 60px;_x000D_
    right: 0;_x000D_
    transition: right 1s ease 0s;_x000D_
}_x000D_
#jump3 {_x000D_
    background-color: blue;_x000D_
    top: 120px;_x000D_
    right: 0px;_x000D_
    transition: right 1s ease 0;_x000D_
}_x000D_
#jump4 {_x000D_
    background-color: gray;_x000D_
    top: 180px;_x000D_
    right: 0;_x000D_
    transition: right 1s ease 0;_x000D_
}_x000D_
#box:hover .jump {_x000D_
    right: 50px;_x000D_
}
_x000D_
<div id="box">_x000D_
  <div class="jump" id="jump1">right: 0px<br>transition: right 1s ease 0s</div>_x000D_
  <div class="jump" id="jump2">right: 0<br>transition: right 1s ease 0s</div>_x000D_
  <div class="jump" id="jump3">right: 0px<br>transition: right 1s ease 0</div>_x000D_
  <div class="jump" id="jump4">right: 0<br>transition: right 1s ease 0</div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

Render HTML to an image

I don't expect this to be the best answer, but it seemed interesting enough to post.

Write an app that opens up your favorite browser to the desired HTML document, sizes the window properly, and takes a screen shot. Then, remove the borders of the image.

Batch file to split .csv file

If splitting very large files, the solution I found is an adaptation from this, with PowerShell "embedded" in a batch file. This works fast, as opposed to many other things I tried (I wouldn't know about other options posted here).

The way to use mysplit.bat below is

mysplit.bat <mysize> 'myfile'

Note: The script was intended to use the first argument as the split size. It is currently hardcoded at 100Mb. It should not be difficult to fix this.

Note 2: The filname should be enclosed in single quotes. Other alternatives for quoting apparently do not work.

Note 3: It splits the file at given number of bytes, not at given number of lines. For me this was good enough. Some lines of code could be probably added to complete each chunk read, up to the next CR/LF. This will split in full lines (not with a constant number of them), with no sacrifice in processing time.

Script mysplit.bat:

@REM Using https://stackoverflow.com/questions/19335004/how-to-run-a-powershell-script-from-a-batch-file
@REM and https://stackoverflow.com/questions/1001776/how-can-i-split-a-text-file-using-powershell
@PowerShell  ^
    $upperBound = 100MB;  ^
    $rootName = %2;  ^
    $from = $rootName;  ^
    $fromFile = [io.file]::OpenRead($from);  ^
    $buff = new-object byte[] $upperBound;  ^
    $count = $idx = 0;  ^
    try {  ^
        do {  ^
            'Reading ' + $upperBound;  ^
            $count = $fromFile.Read($buff, 0, $buff.Length);  ^
            if ($count -gt 0) {  ^
                $to = '{0}.{1}' -f ($rootName, $idx);  ^
                $toFile = [io.file]::OpenWrite($to);  ^
                try {  ^
                    'Writing ' + $count + ' to ' + $to;  ^
                    $tofile.Write($buff, 0, $count);  ^
                } finally {  ^
                    $tofile.Close();  ^
                }  ^
            }  ^
            $idx ++;  ^
        } while ($count -gt 0);  ^
    }  ^
    finally {  ^
        $fromFile.Close();  ^
    }  ^
%End PowerShell%

How do you declare an object array in Java?

It's the other way round:

Vehicle[] car = new Vehicle[N];

This makes more sense, as the number of elements in the array isn't part of the type of car, but it is part of the initialization of the array whose reference you're initially assigning to car. You can then reassign it in another statement:

car = new Vehicle[10]; // Creates a new array

(Note that I've changed the type name to match Java naming conventions.)

For further information about arrays, see section 10 of the Java Language Specification.

Delimiters in MySQL

When you create a stored routine that has a BEGIN...END block, statements within the block are terminated by semicolon (;). But the CREATE PROCEDURE statement also needs a terminator. So it becomes ambiguous whether the semicolon within the body of the routine terminates CREATE PROCEDURE, or terminates one of the statements within the body of the procedure.

The way to resolve the ambiguity is to declare a distinct string (which must not occur within the body of the procedure) that the MySQL client recognizes as the true terminator for the CREATE PROCEDURE statement.

Iterate through dictionary values?

Create the opposite dictionary:

PIX1 = {}
for key in PIX0.keys():
    PIX1[PIX0.get(key)] = key

Then run the same code on this dictionary instead (using PIX1 instead of PIX0).

BTW, I'm not sure about Python 3, but in Python 2 you need to use raw_input instead of input.

Add a CSS class to <%= f.submit %>

both of them works <%= f.submit class: "btn btn-primary" %> and <%= f.submit "Name of Button", class: "btn btn-primary "%>

How to parse a date?

You cannot expect to parse a date with a SimpleDateFormat that is set up with a different format.

To parse your "Thu Jun 18 20:56:02 EDT 2009" date string you need a SimpleDateFormat like this (roughly):

SimpleDateFormat parser=new SimpleDateFormat("EEE MMM d HH:mm:ss zzz yyyy");

Use this to parse the string into a Date, and then your other SimpleDateFormat to turn that Date into the format you want.

        String input = "Thu Jun 18 20:56:02 EDT 2009";
        SimpleDateFormat parser = new SimpleDateFormat("EEE MMM d HH:mm:ss zzz yyyy");
        Date date = parser.parse(input);
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
        String formattedDate = formatter.format(date);

        ...

JavaDoc: http://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html

AngularJS : How do I switch views from a controller function?

Without doing a full revamp of the default routing (#/ViewName) environment, I was able to do a slight modification of Cody's tip and got it working great.

the controller

.controller('GeneralCtrl', ['$route', '$routeParams', '$location',
        function($route, $routeParams, $location) {
            ...
            this.goToView = function(viewName){
                $location.url('/' + viewName);
            }
        }]
    );

the view

...
<li ng-click="general.goToView('Home')">HOME</li>
...

What brought me to this solution was when I was attempting to integrate a Kendo Mobile UI widget into an angular environment I was losing the context of my controller and the behavior of the regular anchor tag was also being hijacked. I re-established my context from within the Kendo widget and needed to use a method to navigate...this worked.

Thanks for the previous posts!

get list of pandas dataframe columns based on data type

I use infer_objects()

Docstring: Attempt to infer better dtypes for object columns.

Attempts soft conversion of object-dtyped columns, leaving non-object and unconvertible columns unchanged. The inference rules are the same as during normal Series/DataFrame construction.

df.infer_objects().dtypes

Forbidden You don't have permission to access / on this server

Found my solution thanks to Error with .htaccess and mod_rewrite
For Apache 2.4 and in all *.conf files (e.g. httpd-vhosts.conf, http.conf, httpd-autoindex.conf ..etc) use

Require all granted

instead of

Order allow,deny
Allow from all

The Order and Allow directives are deprecated in Apache 2.4.

What does the fpermissive flag do?

Right from the docs:

-fpermissive
Downgrade some diagnostics about nonconformant code from errors to warnings. Thus, using -fpermissive will allow some nonconforming code to compile.

Bottom line: don't use it unless you know what you are doing!

How to remove "rows" with a NA value?

dat <- data.frame(x1 = c(1,2,3, NA, 5), x2 = c(100, NA, 300, 400, 500))

na.omit(dat)
  x1  x2
1  1 100
3  3 300
5  5 500

Is there a splice method for strings?

I solved my problem using this code, is a somewhat replacement for the missing splice.

let str = "I need to remove a character from this";
let pos = str.indexOf("character")

if(pos>-1){
  let result = str.slice(0, pos-2) + str.slice(pos, str.length);
  console.log(result) //I need to remove character from this 
}

I needed to remove a character before/after a certain word, after you get the position the string is split in two and then recomposed by flexibly removing characters using an offset along pos

Only using @JsonIgnore during serialization, but not deserialization

Exactly how to do this depends on the version of Jackson that you're using. This changed around version 1.9, before that, you could do this by adding @JsonIgnore to the getter.

Which you've tried:

Add @JsonIgnore on the getter method only

Do this, and also add a specific @JsonProperty annotation for your JSON "password" field name to the setter method for the password on your object.

More recent versions of Jackson have added READ_ONLY and WRITE_ONLY annotation arguments for JsonProperty. So you could also do something like:

@JsonProperty(access = Access.WRITE_ONLY)
private String password;

Docs can be found here.

LaTeX source code listing like in professional books

For R code I use

\usepackage{listings}
\lstset{
language=R,
basicstyle=\scriptsize\ttfamily,
commentstyle=\ttfamily\color{gray},
numbers=left,
numberstyle=\ttfamily\color{gray}\footnotesize,
stepnumber=1,
numbersep=5pt,
backgroundcolor=\color{white},
showspaces=false,
showstringspaces=false,
showtabs=false,
frame=single,
tabsize=2,
captionpos=b,
breaklines=true,
breakatwhitespace=false,
title=\lstname,
escapeinside={},
keywordstyle={},
morekeywords={}
}

And it looks exactly like this

enter image description here

Smooth scrolling with just pure css

You can do this with pure CSS but you will need to hard code the offset scroll amounts, which may not be ideal should you be changing page content- or should dimensions of your content change on say window resize.

You're likely best placed to use e.g. jQuery, specifically:

$('html, body').stop().animate({
   scrollTop: element.offset().top
}, 1000);

A complete implementation may be:

$('#up, #down').on('click', function(e){
    e.preventDefault();
    var target= $(this).get(0).id == 'up' ? $('#down') : $('#up');
    $('html, body').stop().animate({
       scrollTop: target.offset().top
    }, 1000);
});

Where element is the target element to scroll to and 1000 is the delay in ms before completion.

Demo Fiddle

The benefit being, no matter what changes to your content dimensions, the function will not need to be altered.

How to resize html canvas element?

Note that if your canvas is statically declared you should use the width and height attributes, not the style, eg. this will work:

<canvas id="c" height="100" width="100" style="border:1px"></canvas>
<script>
    document.getElementById('c').width = 200;
</script>

But this will not work:

<canvas id="c" style="width: 100px; height: 100px; border:1px"></canvas>
<script>
    document.getElementById('c').width = 200;
</script>

What are my options for storing data when using React Native? (iOS and Android)

you can use sync storage that is easier to use than async storage. this library is great that uses async storage to save data asynchronously and uses memory to load and save data instantly synchronously, so we save data async to memory and use in app sync, so this is great.

import SyncStorage from 'sync-storage';

SyncStorage.set('foo', 'bar');
const result = SyncStorage.get('foo');
console.log(result); // 'bar'

Create a string of variable length, filled with a repeated character

Version that works in all browsers

This function does what you want, and performs a lot faster than the option suggested in the accepted answer :

var repeat = function(str, count) {
    var array = [];
    for(var i = 0; i <= count;)
        array[i++] = str;
    return array.join('');
}

You use it like this :

var repeatedCharacter = repeat("a", 10);

To compare the performance of this function with that of the option proposed in the accepted answer, see this Fiddle and this Fiddle for benchmarks.

Version for moderns browsers only

In modern browsers, you can now also do this :

var repeatedCharacter = "a".repeat(10) };

This option is even faster. However, unfortunately it doesn't work in any version of Internet explorer.

The numbers in the table specify the first browser version that fully supports the method :

enter image description here

How to check type of variable in Java?

I did it using: if(x.getClass() == MyClass.class){...}

Compilation error: stray ‘\302’ in program etc

I noticed an issue in using the above tr command. The tr command COMPLETELY removes the "smart quotes". It would be better to replace the "smart quotes" with something like this.

This will give you a quick preview of what will be replaced.

sed s/[”“]/'"'/g File.txt

This will do the replacements and put the replacement in a new file called WithoutSmartQuotes.txt.

sed s/[”“]/'"'/g File.txt > WithoutSmartQuotes.txt

This will overwrite the original file.

sed -i ".bk" s/[”“]/'"'/g File.txt

http://developmentality.wordpress.com/2010/10/11/how-to-remove-smart-quotes-from-a-text-file/

How can I capitalize the first letter of each word in a string using JavaScript?

Here I have used three functions toLowerCase(), toUpperCase() and replace(regex,replacer)

function titleCase(str) { 
     return str.toLowerCase().replace(/^(\w)|\s(\w)/g, (grp) => grp.toUpperCase()); 
}

titleCase("I'm a little tea pot");

Sum values from multiple rows using vlookup or index/match functions

You should use Ctrl+shift+enter when using the =SUM(VLOOKUP(A9,A1:D5,{2,3,4,},FALSE)) that results in {=SUM(VLOOKUP(A9,A1:D5,{2,3,4,},FALSE))} en also works.

ASP.NET MVC ActionLink and post method

I have done the same issue using following code:

@using (Html.BeginForm("Delete", "Admin"))
{
       @Html.Hidden("ProductID", item.ProductID)
       <input type="submit" value="Delete" />
}

How to use LocalBroadcastManager?

I am an iOS dev, so I made a solution similar to NotificationCenter:

object NotificationCenter {
    var observers: MutableMap<String, MutableList<NotificationObserver>> = mutableMapOf()

    fun addObserver(observer: NotificationObserver, notificationName: NotificationName) {
        var os = observers[notificationName.value]
        if (os == null) {
            os = mutableListOf<NotificationObserver>()
            observers[notificationName.value] = os
        }
        os.add(observer)
    }

    fun removeObserver(observer: NotificationObserver, notificationName: NotificationName) {
        val os = observers[notificationName.value]
        if (os != null) {
            os.remove(observer)
        }
    }

    fun removeObserver(observer:NotificationObserver) {
        observers.forEach { name, mutableList ->
            if (mutableList.contains(observer)) {
                mutableList.remove(observer)
            }
        }
    }

    fun postNotification(notificationName: NotificationName, obj: Any?) {
        val os = observers[notificationName.value]
        if (os != null) {
            os.forEach {observer ->
                observer.onNotification(notificationName,obj)
            }
        }
    }
}

interface NotificationObserver {
    fun onNotification(name: NotificationName,obj:Any?)
}

enum class NotificationName(val value: String) {
    onPlayerStatReceived("on player stat received"),
    ...
}

Some class that want to observe notification must conform to observer protocol:

class MainActivity : AppCompatActivity(), NotificationObserver {
    override fun onCreate(savedInstanceState: Bundle?) {
        ...
        NotificationCenter.addObserver(this,NotificationName.onPlayerStatReceived)
    }
    override fun onDestroy() {
        ...
        super.onDestroy()
        NotificationCenter.removeObserver(this)
    }

    ...
    override fun onNotification(name: NotificationName, obj: Any?) {
        when (name) {
            NotificationName.onPlayerStatReceived -> {
                Log.d(tag, "onPlayerStatReceived")
            }
            else -> Log.e(tag, "Notification not handled")
        }
    }

Finally, post some notification to observers:

NotificationCenter.postNotification(NotificationName.onPlayerStatReceived,null)

How do I reference tables in Excel using VBA?

Converting a range to a table as described in this answer:

Sub CreateTable()
    ActiveSheet.ListObjects.Add(xlSrcRange, Range("$B$1:$D$16"), , xlYes).Name = _
        "Table1"
        'No go in 2003
    ActiveSheet.ListObjects("Table1").TableStyle = "TableStyleLight2"
End Sub

Ubuntu, how do you remove all Python 3 but not 2

First of all, don't try the following command as suggested by Germain above.

   `sudo apt-get remove 'python3.*'`

In Ubuntu, many software depends upon Python3 so if you will execute this command it will remove all of them as it happened with me. I found following answer useful to recover it.

https://askubuntu.com/questions/810854/i-deleted-package-python3-on-ubuntu-and-i-have-lost-dashboard-terminal-and-un

If you want to use different python versions for different projects then create virtual environments it will be very useful. refer to the following link to create virtual environments.

Creating Virtual Environment also helps in using Tensorflow and Keras in Jupyter Notebook.

https://linoxide.com/linux-how-to/setup-python-virtual-environment-ubuntu/

JavaFX "Location is required." even though it is in the same package

If your project is Maven based Idea will ignore all but java files in your src/main/java folder. Like you said moving the file to src/main/resources works, but now SceneBuilder does not know about your controller class anymore because it's in a completely different directory and you lose all the insight, you build blindly.

I believe this is an issue in intellij since SceneBuilder EXPECTS to find your controller class java file in (and i quote) "the same directory, a direct subdirectory or the parent directory of the .fxml" document.

Submit form on pressing Enter with AngularJS

If you want to call function without form you can use my ngEnter directive:

Javascript:

angular.module('yourModuleName').directive('ngEnter', function() {
        return function(scope, element, attrs) {
            element.bind("keydown keypress", function(event) {
                if(event.which === 13) {
                    scope.$apply(function(){
                        scope.$eval(attrs.ngEnter, {'event': event});
                    });

                    event.preventDefault();
                }
            });
        };
    });

HTML:

<div ng-app="" ng-controller="MainCtrl">
    <input type="text" ng-enter="doSomething()">    
</div>

I submit others awesome directives on my twitter and my gist account.

Mysql 1050 Error "Table already exists" when in fact, it does not

Encountering the same problem (create InnoDB table) this is what finally worked for me:

DROP DATABASE `having_issues`;

I checked on a file basis, permissions, tried to REPAIR and FLUSH but nothing worked.

So if this is an option, move all working tables to another DATABASE, drop the old one (you might have to manually remove any files from the database folder before the drop to work), rename the new one, and you 'should' be back on your way. Apparently, whatever gets 'cached' using InnoDB is dropped along with the original database.

Jboss server error : Failed to start service jboss.deployment.unit."jbpm-console.war"

I had the exact same problem, found that I was missing

<mdb>  
  <resource-adapter-ref resource-adapter-name="hornetq-ra"/>  
  <bean-instance-pool-ref pool-name="mdb-strict-max-pool"/>  
</mdb>  

under

<subsystem xmlns="urn:jboss:domain:ejb3:1.2">  

in standalone/configuration/standalone.xml

java.net.ConnectException: localhost/127.0.0.1:8080 - Connection refused

in android

Replace: String webServiceUrl = "http://localhost:8080/Service1.asmx"

With : String webServiceUrl = "http://10.0.2.2:8080/Service1.asmx"

Good luck!

How to change the background-color of jumbrotron?

Just remove class full from <html> and add it to <body> tag. Then set style background-color:transparent !important; for the Jumbotron div (as Amit Joki said in his answer).

Detect if the app was launched/opened from a push notification

M.Othman's answer is correct for apps that don't contain scene delegate For Scene Delegate Apps This worked for me on iOS 13

Here is the code for that should be written in will connect scene

if connectionOptions.notificationResponse == nil { 
//Not opened from push notification
} else {
  //Opened from push notification
}

Code for app delegate to support earlier versions didFinishLaunchingWithOptions

let notification = launchOptions?[UIApplication.LaunchOptionsKey.remoteNotification]
        if (notification != nil) {

            //Launched from push notification
        } else {

            //Launch from other source
        }

what does "dead beef" mean?

People normally use it to indicate dummy values. I think that it primarily was used before the idea of NULL pointers.

What is a user agent stylesheet?

Each browser provides a default stylesheet, called the user agent stylesheet, in case an HTML file does not specify one. Styles that you specify override the defaults.

Because you have not specified values for the table element’s box, the default styles have been applied.

Generate 'n' unique random numbers within a range

If you just need sampling without replacement:

>>> import random
>>> random.sample(range(1, 100), 3)
[77, 52, 45]

random.sample takes a population and a sample size k and returns k random members of the population.

If you have to control for the case where k is larger than len(population), you need to be prepared to catch a ValueError:

>>> try:
...   random.sample(range(1, 2), 3)
... except ValueError:
...   print('Sample size exceeded population size.')
... 
Sample size exceeded population size

Can we execute a java program without a main() method?

Yes You can compile and execute without main method By using static block. But after static block executed (printed) you will get an error saying no main method found.

And Latest INFO --> YOU cant Do this with JAVA 7 version. IT will not execute.

{
    static
    {
        System.out.println("Hello World!");
        System.exit(0); // prevents “main method not found” error
    }
}

But this will not execute with JAVA 7 version.

How do I make a fixed size formatted string in python?

Sure, use the .format method. E.g.,

print('{:10s} {:3d}  {:7.2f}'.format('xxx', 123, 98))
print('{:10s} {:3d}  {:7.2f}'.format('yyyy', 3, 1.0))
print('{:10s} {:3d}  {:7.2f}'.format('zz', 42, 123.34))

will print

xxx        123    98.00
yyyy         3     1.00
zz          42   123.34

You can adjust the field sizes as desired. Note that .format works independently of print to format a string. I just used print to display the strings. Brief explanation:

10s format a string with 10 spaces, left justified by default

3d format an integer reserving 3 spaces, right justified by default

7.2f format a float, reserving 7 spaces, 2 after the decimal point, right justfied by default.

There are many additional options to position/format strings (padding, left/right justify etc), String Formatting Operations will provide more information.

Update for f-string mode. E.g.,

text, number, other_number = 'xxx', 123, 98
print(f'{text:10} {number:3d}  {other_number:7.2f}')

For right alignment

print(f'{text:>10} {number:3d}  {other_number:7.2f}')

python: iterate a specific range in a list

A more memory efficient way to iterate over a slice of a list would be to use islice() from the itertools module:

from itertools import islice

listOfStuff = (['a','b'], ['c','d'], ['e','f'], ['g','h'])

for item in islice(listOfStuff, 1, 3):
    print item

# ['c', 'd']
# ['e', 'f']

However, this can be relatively inefficient in terms of performance if the start value of the range is a large value sinceislicewould have to iterate over the first start value-1 items before returning items.

How to check if any Checkbox is checked in Angular

If you don't want to use a watcher, you can do something like this:

<input type='checkbox' ng-init='checkStatus=false' ng-model='checkStatus' ng-click='doIfChecked(checkStatus)'>

Warning: comparison with string literals results in unspecified behaviour

if (args[i] == "&")

Ok, let's disect what this does.

args is an array of pointers. So, here you are comparing args[i] (a pointer) to "&" (also a pointer). Well, the only way this will every be true is if somewhere you have args[i]="&" and even then, "&" is not guaranteed to point to the same place everywhere.

I believe what you are actually looking for is either strcmp to compare the entire string or your wanting to do if (*args[i] == '&') to compare the first character of the args[i] string to the & character

get unique machine id

The following site uses System.Management to accomplish the same is a very sleek way in a console application

How to Display Multiple Google Maps per page with API V3

I have just finished adding Google Maps to my company's CMS offering. My code allows for more than one map in a page.

Notes:

  • I use jQuery
  • I put the address in the content and then parse it out to dynamically generate the map
  • I include a Marker and an InfoWindow in my map

HTML:

<div class="block maps first">
    <div class="content">
        <div class="map_canvas">
            <div class="infotext">
                <div class="location">Middle East Bakery & Grocery</div>
                <div class="address">327 5th St</div>
                <div class="city">West Palm Beach</div>
                <div class="state">FL</div>
                <div class="zip">33401-3995</div>
                <div class="country">USA</div>
                <div class="phone">(561) 659-4050</div>
                <div class="zoom">14</div>
            </div>
        </div>
    </div>
</div>
<div class="block maps last">
    <div class="content">
        <div class="map_canvas">
            <div class="infotext">
                <div class="location">Global Design, Inc</div>
                <div class="address">3434 SW Ash Pl</div>
                <div class="city">Palm City</div>
                <div class="state">FL</div>
                <div class="zip">34990</div>
                <div class="country">USA</div>
                <div class="phone"></div>
                <div class="zoom">17</div>
            </div>
        </div>
    </div>
</div>

Code:

$(document).ready(function() {
    $maps = $('.block.maps .content .map_canvas');
    $maps.each(function(index, Element) {
        $infotext = $(Element).children('.infotext');

        var myOptions = {
            'zoom': parseInt($infotext.children('.zoom').text()),
            'mapTypeId': google.maps.MapTypeId.ROADMAP
        };
        var map;
        var geocoder;
        var marker;
        var infowindow;
        var address = $infotext.children('.address').text() + ', '
                + $infotext.children('.city').text() + ', '
                + $infotext.children('.state').text() + ' '
                + $infotext.children('.zip').text() + ', '
                + $infotext.children('.country').text()
        ;
        var content = '<strong>' + $infotext.children('.location').text() + '</strong><br />'
                + $infotext.children('.address').text() + '<br />'
                + $infotext.children('.city').text() + ', '
                + $infotext.children('.state').text() + ' '
                + $infotext.children('.zip').text()
        ;
        if (0 < $infotext.children('.phone').text().length) {
            content += '<br />' + $infotext.children('.phone').text();
        }

        geocoder = new google.maps.Geocoder();
        geocoder.geocode({'address': address}, function(results, status) {
            if (status == google.maps.GeocoderStatus.OK) {
                myOptions.center = results[0].geometry.location;
                map = new google.maps.Map(Element, myOptions);
                marker = new google.maps.Marker({
                    map: map,
                    position: results[0].geometry.location,
                    title: $infotext.children('.location').text()
                });
                infowindow = new google.maps.InfoWindow({'content': content});
                google.maps.event.addListener(map, 'tilesloaded', function(event) {
                    infowindow.open(map, marker);
                });
                google.maps.event.addListener(marker, 'click', function() {
                    infowindow.open(map, marker);
                });
            } else {
                alert('The address could not be found for the following reason: ' + status);
            }
        });
    });
});

Passing multiple values for same variable in stored procedure

Your stored procedure is designed to accept a single parameter, Arg1List. You can't pass 4 parameters to a procedure that only accepts one.

To make it work, the code that calls your procedure will need to concatenate your parameters into a single string of no more than 3000 characters and pass it in as a single parameter.

Progress Bar with HTML and CSS

There is a tutorial for creating an HTML5 progress bar here. If you don't want to use HTML5 methods or you are looking for an all-browser solution, try this code:

_x000D_
_x000D_
<div style="width: 150px; height: 25px; background-color: #dbdbdb;">
  <div style="height: 25px; width:87%; background-color: gold">&nbsp;</div>
</div>
_x000D_
_x000D_
_x000D_

You can change the color GOLD to any progress bar color and #dbdbdb to the background-color of your progress bar.

document.getelementbyId will return null if element is not defined?

getElementById is defined by DOM Level 1 HTML to return null in the case no element is matched.

!==null is the most explicit form of the check, and probably the best, but there is no non-null falsy value that getElementById can return - you can only get null or an always-truthy Element object. So there's no practical difference here between !==null, !=null or the looser if (document.getElementById('xx')).

ASP.NET MVC 4 Custom Authorize Attribute with Permission Codes (without roles)

If you use the WEB API with Claims, you can use this:

[AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, Inherited = true, AllowMultiple = true)]
public class AutorizeCompanyAttribute:  AuthorizationFilterAttribute
{
    public string Company { get; set; }

    public override void OnAuthorization(HttpActionContext actionContext)
    {
        var claims = ((ClaimsIdentity)Thread.CurrentPrincipal.Identity);
        var claim = claims.Claims.Where(x => x.Type == "Company").FirstOrDefault();

        string privilegeLevels = string.Join("", claim.Value);        

        if (privilegeLevels.Contains(this.Company)==false)
        {
            actionContext.Response = actionContext.Request.CreateResponse(HttpStatusCode.Unauthorized, "Usuario de Empresa No Autorizado");
        }
    }
}
[HttpGet]
[AutorizeCompany(Company = "MyCompany")]
[Authorize(Roles ="SuperAdmin")]
public IEnumerable MyAction()
{....
}