How to add facebook share button on my website?

You can read more about share button here on Facebook developers website

Also take a look at custom Facebook Share button JSFIDDLE

Include Facebook JavaScript SDK code right after the opening <body> tag

<div id="fb-root"></div>
<script>(function(d, s, id) {
  var js, fjs = d.getElementsByTagName(s)[0];
  if (d.getElementById(id)) return;
  js = d.createElement(s); js.id = id;
  js.src = "//connect.facebook.net/en_US/all.js#xfbml=1";
  fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>

And place below code wherever you want to show Facebook Share button

<div class="fb-share-button" data-href="https://developers.facebook.com/docs/plugins/" data-width="200" data-type="button_count"></div>

enter image description here

Check working JSFIDDLE

Facebook Javascript SDK Problem: "FB is not defined"

Have you set the appId property to your current application ID?

Chrome violation : [Violation] Handler took 83ms of runtime

Perhaps a little off topic, just be informed that these kind of messages can also be seen when you are debugging your code with a breakpoint inside an async function like setTimeout like below:

[Violation] 'setTimeout' handler took 43129ms

That number (43129ms) depends on how long you stop in your async function

How to get access token from FB.login method in javascript SDK

https://developers.facebook.com/docs/facebook-login/login-flow-for-web/

{
    status: 'connected',
    authResponse: {
        accessToken: '...',
        expiresIn:'...',
        signedRequest:'...',
        userID:'...'
    }
}


FB.login(function(response) {
    if (response.authResponse) {
        // The person logged into your app
    } else {
        // The person cancelled the login dialog
    }
});

Given URL is not permitted by the application configuration

Note, the localhost is a special string that FB allows here. If you didn't configure your debugging environment under localhost, you'll have to push it underneath that name as far as I can tell.

"Uncaught (in promise) undefined" error when using with=location in Facebook Graph API query

The error tells you that there is an error but you don´t catch it. This is how you can catch it:

getAllPosts().then(response => {
    console.log(response);
}).catch(e => {
    console.log(e);
});

You can also just put a console.log(reponse) at the beginning of your API callback function, there is definitely an error message from the Graph API in it.

More information: https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Promise/catch

Or with async/await:

//some async function
try {
    let response = await getAllPosts();
} catch(e) {
    console.log(e);
}

Facebook API error 191

For me it's the Valid OAuth Redirect URIs in Facebook Login Settings. The 191 error is gone once I updated the correct redirect URI.

What is the use of GO in SQL Server Management Studio & Transact SQL?

Go means, whatever SQL statements are written before it and after any earlier GO, will go to SQL server for processing.

Select * from employees;
GO    -- GO 1

update employees set empID=21 where empCode=123;
GO    -- GO 2

In the above example, statements before GO 1 will go to sql sever in a batch and then any other statements before GO 2 will go to sql server in another batch. So as we see it has separated batches.

Best way to get whole number part of a Decimal number

I think System.Math.Truncate is what you're looking for.

Check last modified date of file in C#

System.IO.File.GetLastWriteTime is what you need.

changing color of h2

Try CSS:

<h2 style="color:#069">Process Report</h2>

If you have more than one h2 tags which should have the same color add a style tag to the head tag like this:

<style type="text/css">
h2 {
    color:#069;
}
</style>

How to trim a list in Python

l = [4,76,2,8,6,4,3,7,2,1]
l = l[:5]

Is there a way to make AngularJS load partials in the beginning and not at when needed?

If you use rails, you can use the asset pipeline to compile and shove all your haml/erb templates into a template module which can be appended to your application.js file. Checkout http://minhajuddin.com/2013/04/28/angularjs-templates-and-rails-with-eager-loading

How to drop a database with Mongoose?

beforeEach((done) => {
      mongoose.connection.dropCollection('products',(error ,result) => {
      if (error) {
        console.log('Products Collection is not dropped')
      } else {
        console.log(result)
      }
    done()
    })
  })

How to make layout with rounded corners..?

Here's a copy of a XML file to create a drawable with a white background, black border and rounded corners:

 <?xml version="1.0" encoding="UTF-8"?> 
    <shape xmlns:android="http://schemas.android.com/apk/res/android"> 
        <solid android:color="#ffffffff"/>    

        <stroke android:width="3dp"
                android:color="#ff000000"
                />

        <padding android:left="1dp"
                 android:top="1dp"
                 android:right="1dp"
                 android:bottom="1dp"
                 /> 

        <corners android:bottomRightRadius="7dp" android:bottomLeftRadius="7dp" 
         android:topLeftRadius="7dp" android:topRightRadius="7dp"/> 
    </shape>

save it as a xml file in the drawable directory, Use it like you would use any drawable background(icon or resource file) using its resource name (R.drawable.your_xml_name)

Run jar file with command line arguments

For the question

How can i run a jar file in command prompt but with arguments

To pass arguments to the jar file at the time of execution

java -jar myjar.jar arg1 arg2

In the main() method of "Main-Class" [mentioned in the manifest.mft file]of your JAR file. you can retrieve them like this:

String arg1 = args[0];
String arg2 = args[1];

Is there a better way to run a command N times in bash?

A little bit naive but this is what I usually remember off the top of my head:

for i in 1 2 3; do
  some commands
done

Very similar to @joe-koberg's answer. His is better especially if you need many repetitions, just harder for me to remember other syntax because in last years I'm not using bash a lot. I mean not for scripting at least.

Error while installing json gem 'mkmf.rb can't find header files for ruby'

in case you use SUSE

sudo yast2 -i ruby-devel

Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist

initialize mysql before start on windows.

mysqld --initialize

ListAGG in SQLSERVER

In SQL Server 2017 STRING_AGG is added:

SELECT t.name,STRING_AGG (c.name, ',') AS csv
FROM sys.tables t
JOIN sys.columns c on t.object_id = c.object_id
GROUP BY t.name
ORDER BY 1

Also, STRING_SPLIT is usefull for the opposite case and available in SQL Server 2016

How to make div appear in front of another?

You can set the z-index in css

<div style="z-index: -1"></div>

Checkout Jenkins Pipeline Git SCM with credentials?

For what it's worth adding to the discussion... what I did that ended up helping me... Since the pipeline is run within a workspace within a docker image that is cleaned up each time it runs. I grabbed the credentials needed to perform necessary operations on the repo within my pipeline and stored them in a .netrc file. this allowed me to authorize the git repo operations successfully.

withCredentials([usernamePassword(credentialsId: '<credentials-id>', passwordVariable: 'GIT_PASSWORD', usernameVariable: 'GIT_USERNAME')]) {
    sh '''
        printf "machine github.com\nlogin $GIT_USERNAME\n password $GIT_PASSWORD" >> ~/.netrc
        // continue script as necessary working with git repo...
    '''
}

Live Video Streaming with PHP

For live video conferencing you can't ignore the need of a streaming server.

Yes, flash will let you display video from a webcam within the local flash control, but that won't let you then send that video over the network - for that you need a streaming server to send it to.

If you're going to build something like this it's prudent to think about how you're going to host the video from a very early stage as it will influence how you build the application. Flash/Flex/Silverlight/Windows Media....etc....

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

You can also use numpy loadtxt like

from numpy import loadtxt
lines = loadtxt("filename.dat", comments="#", delimiter=",", unpack=False)

CRON job to run on the last day of the month

Possibly the easiest way is to simply do three separate jobs:

55 23 30 4,6,9,11        * myjob.sh
55 23 31 1,3,5,7,8,10,12 * myjob.sh
55 23 28 2               * myjob.sh

That will run on the 28th of February though, even on leap years so, if that's a problem, you'll need to find another way.

However, it's usually both substantially easier and correct to run the job as soon as possible on the first day of each month, with something like:

0 0 1 * * myjob.sh

and modify the script to process the previous month's data.

This removes any hassles you may encounter with figuring out which day is the last of the month, and also ensures that all data for that month is available, assuming you're processing data. Running at five minutes to midnight on the last day of the month may see you missing anything that happens between then and midnight.

This is the usual way to do it anyway, for most end-of-month jobs.

If you still really want to run it on the last day of the month, one option is to simply detect if tomorrow is the first (either as part of your script, or in the crontab itself).

So, something like:

55 23 28-31 * * [[ "$(date --date=tomorrow +\%d)" == "01" ]] && myjob.sh

should be a good start, assuming you have a relatively intelligent date program.

If your date program isn't quite advanced enough to give you relative dates, you can just put together a very simple program to give you tomorrow's day of the month (you don't need the full power of date), such as:

#include <stdio.h>
#include <time.h>

int main (void) {
    // Get today, somewhere around midday (no DST issues).

    time_t noonish = time (0);
    struct tm *localtm = localtime (&noonish);
    localtm->tm_hour = 12;

    // Add one day (86,400 seconds).

    noonish = mktime (localtm) + 86400;
    localtm = localtime (&noonish);

    // Output just day of month.

    printf ("%d\n", localtm->tm_mday);

    return 0;
}

and then use (assuming you've called it tomdom for "tomorrow's day of month"):

55 23 28-31 * * [[ "$(tomdom)" == "1" ]] && myjob.sh

Though you may want to consider adding error checking since both time() and mktime() can return -1 if something goes wrong. The code above, for reasons of simplicity, does not take that into account.

How to install a specific version of package using Composer?

As @alucic mentioned, use:

composer require vendor/package:version

or you can use:

composer update vendor/package:version

You should probably review this StackOverflow post about differences between composer install and composer update.

Related to question about version numbers, you can review Composer documentation on versions, but here in short:

Tilde Version Range (~) - ~1.2.3 is equivalent to >=1.2.3 <1.3.0
Caret Version Range (^) - ^1.2.3 is equivalent to >=1.2.3 <2.0.0

So, with Tilde you will get automatic updates of patches but minor and major versions will not be updated. However, if you use Caret you will get patches and minor versions, but you will not get major (breaking changes) versions.

Tilde Version is considered a "safer" approach, but if you are using reliable dependencies (well-maintained libraries) you should not have any problems with Caret Version (because minor changes should not be breaking changes.

Java 256-bit AES Password-Based Encryption

What I've done in the past is hash the key via something like SHA256, then extract the bytes from the hash into the key byte[].

After you have your byte[] you can simply do:

SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] encryptedBytes = cipher.doFinal(clearText.getBytes());

How to link external javascript file onclick of button

If you want your button to call the routine you have written in filename.js you have to edit filename.js so that the code you want to run is the body of a function. For you can call a function, not a source file. (A source file has no entry point)

If the current content of your filename.js is:

_x000D_

alert('Hello world');

_x000D_

you have to change it to:

_x000D_

function functionName(){_x000D_
 alert('Hello world');_x000D_
}

_x000D_

Then you have to load filename.js in the header of your html page by the line:

_x000D_

<head>_x000D_
 <script type="text/javascript" src="Public/Scripts/filename.js"></script>_x000D_
</head>

_x000D_

so that you can call the function contained in filename.js by your button:

_x000D_

<button onclick="functionName()">Call the function</button>

_x000D_

I have made a little working example. A simple HTML page asks the user to input her name, and when she clicks the button, the function inside Public/Scripts/filename.js is called passing the inserted string as a parameter so that a popup says "Hello, <insertedName>!".

Here is the calling HTML page:

_x000D_

<html>_x000D_
_x000D_
 <head>_x000D_
  <script type="text/javascript" src="Public/Scripts/filename.js"></script>_x000D_
 </head>_x000D_
_x000D_
 <body>_x000D_
  What's your name? <input  id="insertedName" />_x000D_
  <button onclick="functionName(insertedName.value)">Say hello</button>_x000D_
 </body>_x000D_
_x000D_
</html>

_x000D_

And here is Public/Scripts/filename.js

_x000D_

function functionName( s ){_x000D_
 alert('Hello, ' + s + '!');_x000D_
}

_x000D_

How to remove html special chars?

If you want to convert the HTML special characters and not just remove them as well as strip things down and prepare for plain text this was the solution that worked for me...

function htmlToPlainText($str){
    $str = str_replace('&nbsp;', ' ', $str);
    $str = html_entity_decode($str, ENT_QUOTES | ENT_COMPAT , 'UTF-8');
    $str = html_entity_decode($str, ENT_HTML5, 'UTF-8');
    $str = html_entity_decode($str);
    $str = htmlspecialchars_decode($str);
    $str = strip_tags($str);

    return $str;
}

$string = '<p>this is (&nbsp;) a test</p>
<div>Yes this is! &amp; does it get "processed"? </div>'

htmlToPlainText($string);
// "this is ( ) a test. Yes this is! & does it get processed?"`

html_entity_decode w/ ENT_QUOTES | ENT_XML1 converts things like ' htmlspecialchars_decode converts things like & html_entity_decode converts things like '< and strip_tags removes any HTML tags left over.

EDIT - Added str_replace(' ', ' ', $str); and several other html_entity_decode() as continued testing has shown a need for them.

Find character position and update file name

If you use Excel, then the command would be Find and MID. Here is what it would look like in Powershell.

 $text = "asdfNAME=PC123456<>Diweursejsfdjiwr"

asdfNAME=PC123456<>Diweursejsfdjiwr - Randon line of text, we want PC123456

 $text.IndexOf("E=")

7 - this is the "FIND" command for Powershell

 $text.substring(10,5)

C1234 - this is the "MID" command for Powershell

 $text.substring($text.IndexOf("E=")+2,8)

PC123456 - tada it has found and cut our text

-RavonTUS

How can I set the max-width of a table cell using percentages?

Old question I know, but this is now possible using the css property table-layout: fixed on the table tag. Answer below from this question CSS percentage width and text-overflow in a table cell

This is easily done by using table-layout: fixed, but a little tricky because not many people know about this CSS property.

table {
  width: 100%;
  table-layout: fixed;
}

See it in action at the updated fiddle here: http://jsfiddle.net/Fm5bM/4/

How do I find Waldo with Mathematica?

I agree with @GregoryKlopper that the right way to solve the general problem of finding Waldo (or any object of interest) in an arbitrary image would be to train a supervised machine learning classifier. Using many positive and negative labeled examples, an algorithm such as Support Vector Machine, Boosted Decision Stump or Boltzmann Machine could likely be trained to achieve high accuracy on this problem. Mathematica even includes these algorithms in its Machine Learning Framework.

The two challenges with training a Waldo classifier would be:

Determining the right image feature transform. This is where @Heike's answer would be useful: a red filter and a stripped pattern detector (e.g., wavelet or DCT decomposition) would be a good way to turn raw pixels into a format that the classification algorithm could learn from. A block-based decomposition that assesses all subsections of the image would also be required ... but this is made easier by the fact that Waldo is a) always roughly the same size and b) always present exactly once in each image.
Obtaining enough training examples. SVMs work best with at least 100 examples of each class. Commercial applications of boosting (e.g., the face-focusing in digital cameras) are trained on millions of positive and negative examples.

A quick Google image search turns up some good data -- I'm going to have a go at collecting some training examples and coding this up right now!

However, even a machine learning approach (or the rule-based approach suggested by @iND) will struggle for an image like the Land of Waldos!

How to convert binary string value to decimal

int num = Integer.parseInt("binaryString",2);

jQuery: get parent tr for selected radio button

Try this.

You don't need to prefix attribute name by @ in jQuery selector. Use closest() method to get the closest parent element matching the selector.

$("#MwDataList input[name=selectRadioGroup]:checked").closest('tr');

You can simplify your method like this

function getSelectedRowGuid() {
    return GetRowGuid(
      $("#MwDataList > input:radio[@name=selectRadioGroup]:checked :parent tr"));
}

closest() - Gets the first element that matches the selector, beginning at the current element and progressing up through the DOM tree.

As a side note, the ids of the elements should be unique on the page so try to avoid having same ids for radio buttons which I can see in your markup. If you are not going to use the ids then just remove it from the markup.

How to scroll the page when a modal dialog is longer than the screen?

Change position

position:fixed;
overflow: hidden;

position:absolute;
overflow:scroll;

MySQL Like multiple values

The (a,b,c) list only works with in. For like, you have to use or:

WHERE interests LIKE '%sports%' OR interests LIKE '%pub%'

How to detect DataGridView CheckBox event change?

The Code will loop in DataGridView and Will check if CheckBox Column is Checked

private void dgv1_CellMouseUp(object sender, DataGridViewCellMouseEventArgs e)
{
    if (e.ColumnIndex == 0 && e.RowIndex > -1)
    {
        dgv1.CommitEdit(DataGridViewDataErrorContexts.Commit);
        var i = 0;
        foreach (DataGridViewRow row in dgv1.Rows)
        {
            if (Convert.ToBoolean(row.Cells[0].Value))
            {
                i++;
            }
        }

        //Enable Button1 if Checkbox is Checked
        if (i > 0)
        {
            Button1.Enabled = true;
        }
        else
        {
            Button1.Enabled = false;
        }
    }
}

What is the best way to update the entity in JPA

That depends on what you want to do, but as you said, getting an entity reference using find() and then just updating that entity is the easiest way to do that.

I'd not bother about performance differences of the various methods unless you have strong indications that this really matters.

Python extract pattern matches

Here's a way to do it without using groups (Python 3.6 or above):

>>> re.search('2\d\d\d[01]\d[0-3]\d', 'report_20191207.xml')[0]
'20191207'

INSERT IF NOT EXISTS ELSE UPDATE?

Upsert is what you want. UPSERT syntax was added to SQLite with version 3.24.0 (2018-06-04).

CREATE TABLE phonebook2(
  name TEXT PRIMARY KEY,
  phonenumber TEXT,
  validDate DATE
);

INSERT INTO phonebook2(name,phonenumber,validDate)
  VALUES('Alice','704-555-1212','2018-05-08')
  ON CONFLICT(name) DO UPDATE SET
    phonenumber=excluded.phonenumber,
    validDate=excluded.validDate
  WHERE excluded.validDate>phonebook2.validDate;

Be warned that at this point the actual word "UPSERT" is not part of the upsert syntax.

The correct syntax is

INSERT INTO ... ON CONFLICT(...) DO UPDATE SET...

and if you are doing INSERT INTO SELECT ... your select needs at least WHERE true to solve parser ambiguity about the token ON with the join syntax.

Be warned that INSERT OR REPLACE... will delete the record before inserting a new one if it has to replace, which could be bad if you have foreign key cascades or other delete triggers.

using statement with multiple variables

How to cast or convert an unsigned int to int in C?

Unsigned int can be converted to signed (or vice-versa) by simple expression as shown below :

unsigned int z;
int y=5;
z= (unsigned int)y;

Though not targeted to the question, you would like to read following links :

VBA Public Array : how to?

This worked for me, seems to work as global :

Dim savePos(2 To 8) As Integer

And can call it from every sub, for example getting first element :

MsgBox (savePos(2))

Equivalent of explode() to work with strings in MySQL

I try with SUBSTRING_INDEX(string,delimiter,count)

mysql> SELECT SUBSTRING_INDEX('www.mysql.com', '.', 2);
-> 'www.mysql'

mysql> SELECT SUBSTRING_INDEX('www.mysql.com', '.', -2);
-> 'mysql.com'

see more on mysql.com http://dev.mysql.com/doc/refman/5.1/en/string-functions.html#function_substring-index

ACCESS_FINE_LOCATION AndroidManifest Permissions Not Being Granted

just remove s from the permission you are using sss you have to use ss

How do you read a CSV file and display the results in a grid in Visual Basic 2010?

Consider this CodeProject article/project: LINQ TO CSV.

It will enable you to create a custom class that is shaped like your .csv file's columns. You'd then consume the CSV and bind to your DataGridView.

Dim cc As new CsvContext()
Dim inputFileDescription As New CsvFileDescription() With { _
    .SeparatorChar = ","C, _
    .FirstLineHasColumnNames = True _
}

Dim products As IEnumerable(Of Product) = _
     cc.Read(Of Product)("products.csv", inputFileDescription)

' query from CSV, load into a new class of your own   
Dim productsByName = From p In products
    Select New CustomDisplayClass With _
       {.Name = p.Name, .SomeDate = p.SomeDate, .Price = p.Price}, _        
    Order By p.Name


myDataGridView1.DataSource = products
myDataGridView1.DataBind()

org.apache.catalina.core.StandardContext startInternal SEVERE: Error listenerStart

For Intellij Idea sometime localhost.log file generated at different location. For e.g. you can find it at homedirectory\ .IntelliJIdea14\system\tomcat.

IF you are using spring then start ur server in debug mode and put debug point in catch block of org.springframework.context.support.AbstractApplicationContext's refresh() method. If bean creation fails you would be able to see the exception.

Absolute positioning ignoring padding of parent

add padding:inherit in your absolute position

_x000D_

.box{_x000D_
  background: red;_x000D_
  position: relative;_x000D_
  padding: 30px;_x000D_
  width:500px;_x000D_
  height:200px;_x000D_
 box-sizing: border-box;_x000D_
 _x000D_
_x000D_
}

_x000D_

<div  class="box">_x000D_
_x000D_
  <div style="position: absolute;left:0;top:0;padding: inherit">top left</div>_x000D_
  <div style="position: absolute;right:0;top:0;padding: inherit">top right</div>_x000D_
  <div style="text-align: center;padding: inherit">center</div>_x000D_
  <div style="position: absolute;left:0;bottom:0;padding: inherit">bottom left</div>_x000D_
  <div style="position: absolute;right:0;bottom:0;padding: inherit">bottom right</div>_x000D_
_x000D_
_x000D_
</div>

_x000D_

setup android on eclipse but don't know SDK directory

Search (Ctrl+F) your harddrive(s) for: SDK Manager.exe or adb.exe

Viewing all defined variables

In my Python 2.7 interpreter, the same whos command that exists in MATLAB exists in Python. It shows the same details as the MATLAB analog (variable name, type, and value/data).

Note that in the Python interpreter, whos lists all variables in the "interactive namespace".

Why is the default value of the string type null instead of an empty string?

A String is an immutable object which means when given a value, the old value doesn't get wiped out of memory, but remains in the old location, and the new value is put in a new location. So if the default value of String a was String.Empty, it would waste the String.Empty block in memory when it was given its first value.

Although it seems minuscule, it could turn into a problem when initializing a large array of strings with default values of String.Empty. Of course, you could always use the mutable StringBuilder class if this was going to be a problem.

WPF global exception handler

As mentioned above

Application.Current.DispatcherUnhandledException will not catch exceptions that are thrown from another thread then the main thread.

That actual depend on how the thread was created

One case that is not handled by Application.Current.DispatcherUnhandledException is System.Windows.Forms.Timer for which Application.ThreadException can be used to handle these if you run Forms on other threads than the main thread you will need to set Application.ThreadException from each such thread

How to call a mysql stored procedure, with arguments, from command line?

With quotes around the date:

mysql> CALL insertEvent('2012.01.01 12:12:12');

What are the differences between JSON and JSONP?

JSONP stands for “JSON with Padding” and it is a workaround for loading data from different domains. It loads the script into the head of the DOM and thus you can access the information as if it were loaded on your own domain, thus by-passing the cross domain issue.

jsonCallback(
{
    "sites":
    [
        {
            "siteName": "JQUERY4U",
            "domainName": "http://www.jquery4u.com",
            "description": "#1 jQuery Blog for your Daily News, Plugins, Tuts/Tips &amp; Code Snippets."
        },
        {
            "siteName": "BLOGOOLA",
            "domainName": "http://www.blogoola.com",
            "description": "Expose your blog to millions and increase your audience."
        },
        {
            "siteName": "PHPSCRIPTS4U",
            "domainName": "http://www.phpscripts4u.com",
            "description": "The Blog of Enthusiastic PHP Scripters"
        }
    ]
});

(function($) {
var url = 'http://www.jquery4u.com/scripts/jquery4u-sites.json?callback=?';

$.ajax({
   type: 'GET',
    url: url,
    async: false,
    jsonpCallback: 'jsonCallback',
    contentType: "application/json",
    dataType: 'jsonp',
    success: function(json) {
       console.dir(json.sites);
    },
    error: function(e) {
       console.log(e.message);
    }
});

})(jQuery);

Now we can request the JSON via AJAX using JSONP and the callback function we created around the JSON content. The output should be the JSON as an object which we can then use the data for whatever we want without restrictions.

Recover unsaved SQL query scripts

I am using Windows 8 and found the missing scripts in the path below:

C:\Users\YourUsername\Documents\SQL Server Management Studio\Backup Files

Validating with an XML schema in Python

I am assuming you mean using XSD files. Surprisingly there aren't many python XML libraries that support this. lxml does however. Check Validation with lxml. The page also lists how to use lxml to validate with other schema types.

Nested iframes, AKA Iframe Inception

You probably have a timing issue. Your document.ready commend is probably firing before the the second iFrame is loaded. You dont have enough info to help much further- but let us know if that seems like the possible issue.

How to loop over a Class attributes in Java?

There is no linguistic support to do what you're asking for.

You can reflectively access the members of a type at run-time using reflection (e.g. with Class.getDeclaredFields() to get an array of Field), but depending on what you're trying to do, this may not be the best solution.

Example

Here's a simple example to show only some of what reflection is capable of doing.

import java.lang.reflect.*;

public class DumpFields {
    public static void main(String[] args) {
        inspect(String.class);
    }
    static <T> void inspect(Class<T> klazz) {
        Field[] fields = klazz.getDeclaredFields();
        System.out.printf("%d fields:%n", fields.length);
        for (Field field : fields) {
            System.out.printf("%s %s %s%n",
                Modifier.toString(field.getModifiers()),
                field.getType().getSimpleName(),
                field.getName()
            );
        }
    }
}

The above snippet uses reflection to inspect all the declared fields of class String; it produces the following output:

7 fields:
private final char[] value
private final int offset
private final int count
private int hash
private static final long serialVersionUID
private static final ObjectStreamField[] serialPersistentFields
public static final Comparator CASE_INSENSITIVE_ORDER

Effective Java 2nd Edition, Item 53: Prefer interfaces to reflection

These are excerpts from the book:

Given a Class object, you can obtain Constructor, Method, and Field instances representing the constructors, methods and fields of the class. [They] let you manipulate their underlying counterparts reflectively. This power, however, comes at a price:

You lose all the benefits of compile-time checking.

The code required to perform reflective access is clumsy and verbose.

Performance suffers.

As a rule, objects should not be accessed reflectively in normal applications at runtime.

There are a few sophisticated applications that require reflection. Examples include [...omitted on purpose...] If you have any doubts as to whether your application falls into one of these categories, it probably doesn't.

Anaconda Navigator won't launch (windows 10)

For me it worked doing this:

Uninstall the previous version: go to C:\users\username\anaconda3 and run the anaconda-uninstall.exe

Install again anaconda

then run the following commands on the anaconda pompt:

conda create -n my_env python=2.7

conda activate my_env

start the gui app

anaconda-navigator

React Native: Getting the position of an element

This seems to have changed in the latest version of React Native when using refs to calculate.

Declare refs this way.

  <View
    ref={(image) => {
    this._image = image
  }}>

And find the value this way.

  _measure = () => {
    this._image._component.measure((width, height, px, py, fx, fy) => {
      const location = {
        fx: fx,
        fy: fy,
        px: px,
        py: py,
        width: width,
        height: height
      }
      console.log(location)
    })
  }

pySerial write() won't take my string

It turns out that the string needed to be turned into a bytearray and to do this I editted the code to

ser.write("%01#RDD0010000107**\r".encode())

This solved the problem

How to call a method in MainActivity from another class?

What I have done with no memory leaks or lint warnings is to use @f.trajkovski's method, but instead of using MainActivity, use WeakReference<MainActivity> instead.

public class MainActivity extends AppCompatActivity {
public static WeakReference<MainActivity> weakActivity;
// etc..
 public static MainActivity getmInstanceActivity() {
    return weakActivity.get();
}
}

Then in MainActivity OnCreate()

weakActivity = new WeakReference<>(MainActivity.this);

Then in another class

MainActivity.getmInstanceActivity().yourMethod();

Works like a charm

What causes HttpHostConnectException?

In my case the issue was a missing 's' in the HTTP URL. Error was: "HttpHostConnectException: Connect to someendpoint.com:80 [someendpoint.com/127.0.0.1] failed: Connection refused" End point and IP obviously changed to protect the network.

Android: Internet connectivity change listener

Update:

Apps targeting Android 7.0 (API level 24) and higher do not receive CONNECTIVITY_ACTION broadcasts if they declare the broadcast receiver in their manifest. Apps will still receive CONNECTIVITY_ACTION broadcasts if they register their BroadcastReceiver with Context.registerReceiver() and that context is still valid.

You need to register the receiver via registerReceiver() method:

 IntentFilter intentFilter = new IntentFilter("android.net.conn.CONNECTIVITY_CHANGE");
 mCtx.registerReceiver(new NetworkBroadcastReceiver(), intentFilter);

How do I draw a circle in iOS Swift?

A simple function drawing a circle on the middle of your window frame, using a multiplicator percentage

/// CGFloat is a multiplicator from self.view.frame.width
func drawCircle(withMultiplicator coefficient: CGFloat) {

    let radius = self.view.frame.width / 2 * coefficient

    let circlePath = UIBezierPath(arcCenter: self.view.center, radius: radius, startAngle: CGFloat(0), endAngle:CGFloat(Double.pi * 2), clockwise: true)
    let shapeLayer = CAShapeLayer()
    shapeLayer.path = circlePath.cgPath

    //change the fill color
    shapeLayer.fillColor = UIColor.clear.cgColor
    shapeLayer.strokeColor = UIColor.darkGray.cgColor
    shapeLayer.lineWidth = 2.0

    view.layer.addSublayer(shapeLayer)
}

AppCompat v7 r21 returning error in values.xml?

changing the complie SDk version to API level 21 fixed it for me. then i ran into others issues of deploying the app to my device. i changed the minimun API level to target to what i want and that fixed it.

incase someone is experiencing this again.

Converting dd/mm/yyyy formatted string to Datetime

You can use "dd/MM/yyyy" format for using it in DateTime.ParseExact.

Converts the specified string representation of a date and time to its DateTime equivalent using the specified format and culture-specific format information. The format of the string representation must match the specified format exactly.

DateTime date = DateTime.ParseExact("24/01/2013", "dd/MM/yyyy", CultureInfo.InvariantCulture);

Here is a DEMO.

For more informations, check out Custom Date and Time Format Strings

Write a file in external storage in Android

You can do this with this code also.

 public class WriteSDCard extends Activity {

 private static final String TAG = "MEDIA";
 private TextView tv;

  /** Called when the activity is first created. */
@Override
 public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);     
    tv = (TextView) findViewById(R.id.TextView01);
    checkExternalMedia();
    writeToSDFile();
    readRaw();
 }

/** Method to check whether external media available and writable. This is adapted from
   http://developer.android.com/guide/topics/data/data-storage.html#filesExternal */

 private void checkExternalMedia(){
      boolean mExternalStorageAvailable = false;
    boolean mExternalStorageWriteable = false;
    String state = Environment.getExternalStorageState();

    if (Environment.MEDIA_MOUNTED.equals(state)) {
        // Can read and write the media
        mExternalStorageAvailable = mExternalStorageWriteable = true;
    } else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
        // Can only read the media
        mExternalStorageAvailable = true;
        mExternalStorageWriteable = false;
    } else {
        // Can't read or write
        mExternalStorageAvailable = mExternalStorageWriteable = false;
    }   
    tv.append("\n\nExternal Media: readable="
            +mExternalStorageAvailable+" writable="+mExternalStorageWriteable);
}

/** Method to write ascii text characters to file on SD card. Note that you must add a 
   WRITE_EXTERNAL_STORAGE permission to the manifest file or this method will throw
   a FileNotFound Exception because you won't have write permission. */

private void writeToSDFile(){

    // Find the root of the external storage.
    // See http://developer.android.com/guide/topics/data/data-  storage.html#filesExternal

    File root = android.os.Environment.getExternalStorageDirectory(); 
    tv.append("\nExternal file system root: "+root);

    // See http://stackoverflow.com/questions/3551821/android-write-to-sd-card-folder

    File dir = new File (root.getAbsolutePath() + "/download");
    dir.mkdirs();
    File file = new File(dir, "myData.txt");

    try {
        FileOutputStream f = new FileOutputStream(file);
        PrintWriter pw = new PrintWriter(f);
        pw.println("Hi , How are you");
        pw.println("Hello");
        pw.flush();
        pw.close();
        f.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
        Log.i(TAG, "******* File not found. Did you" +
                " add a WRITE_EXTERNAL_STORAGE permission to the   manifest?");
    } catch (IOException e) {
        e.printStackTrace();
    }   
    tv.append("\n\nFile written to "+file);
}

/** Method to read in a text file placed in the res/raw directory of the application. The
  method reads in all lines of the file sequentially. */

private void readRaw(){
    tv.append("\nData read from res/raw/textfile.txt:");
    InputStream is = this.getResources().openRawResource(R.raw.textfile);
    InputStreamReader isr = new InputStreamReader(is);
    BufferedReader br = new BufferedReader(isr, 8192);    // 2nd arg is buffer size

    // More efficient (less readable) implementation of above is the composite expression
    /*BufferedReader br = new BufferedReader(new InputStreamReader(
            this.getResources().openRawResource(R.raw.textfile)), 8192);*/

    try {
        String test;    
        while (true){               
            test = br.readLine();   
            // readLine() returns null if no more lines in the file
            if(test == null) break;
            tv.append("\n"+"    "+test);
        }
        isr.close();
        is.close();
        br.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
    tv.append("\n\nThat is all");
}
}

How do I select a range of values in a switch statement?

log4j vs logback

Not exactly answering your question, but if you could move away from your self-made wrapper then there is Simple Logging Facade for Java (SLF4J) which Hibernate has now switched to (instead of commons logging).

SLF4J suffers from none of the class loader problems or memory leaks observed with Jakarta Commons Logging (JCL).

SLF4J supports JDK logging, log4j and logback. So then it should be fairly easy to switch from log4j to logback when the time is right.

Edit: Aplogies that I hadn't made myself clear. I was suggesting using SLF4J to isolate yourself from having to make a hard choice between log4j or logback.

Tooltip with HTML content without JavaScript

Similar to koningdavid's, but works on display:none and block, and adds additional styling.

_x000D_

div.tooltip {_x000D_
  position: relative;_x000D_
  /*  DO NOT include below two lines, as they were added so that the text that_x000D_
        is hovered over is offset from top of page*/_x000D_
  top: 10em;_x000D_
  left: 10em;_x000D_
  /* if want hover over icon instead of text based, uncomment below */_x000D_
  /*    background-image: url("../images/info_tooltip.svg");_x000D_
            /!* width and height of svg *!/_x000D_
            width: 16px;_x000D_
            height: 16px;*/_x000D_
}_x000D_
_x000D_
_x000D_
/* hide tooltip */_x000D_
_x000D_
div.tooltip span {_x000D_
  display: none;_x000D_
}_x000D_
_x000D_
_x000D_
/* show and style tooltip */_x000D_
_x000D_
div.tooltip:hover span {_x000D_
  /* show tooltip */_x000D_
  display: block;_x000D_
  /* position relative to container div.tooltip */_x000D_
  position: absolute;_x000D_
  bottom: 1em;_x000D_
  /* prettify */_x000D_
  padding: 0.5em;_x000D_
  color: #000000;_x000D_
  background: #ebf4fb;_x000D_
  border: 0.1em solid #b7ddf2;_x000D_
  /* round the corners */_x000D_
  border-radius: 0.5em;_x000D_
  /* prevent too wide tooltip */_x000D_
  max-width: 10em;_x000D_
}

_x000D_

<div class="tooltip">_x000D_
  hover_over_me_x000D_
  <span>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec quis purus dui. Sed at orci. </span>_x000D_
</div>

_x000D_

proper way to sudo over ssh

I was able to fully automate it with the following command:

echo pass | ssh -tt user@server "sudo script"

Advantages:

no password prompt
won't show password in remote machine bash history

Regarding security: as Kurt said, running this command will show your password on your local bash history, and it's better to save the password in a different file or save the all command in a .sh file and execute it. NOTE: The file need to have the correct permissions so that only the allowed users can access it.

Can't push to remote branch, cannot be resolved to branch

I had the same problem but was resolved. I realized branch name is case sensitive. The main branch in GitHub is 'master', while in my gitbash command it's 'Master'. I renamed Master in local repository to master and it worked!

Can I get a patch-compatible output from git-diff?

I save the diff of the current directory (including uncommitted files) against the current HEAD.
Then you can transport the save.patch file to wherever (including binary files).
On your target machine, apply the patch using git apply <file>

Note: it diff's the currently staged files too.

$ git diff --binary --staged HEAD > save.patch
$ git reset --hard
$ <transport it>
$ git apply save.patch

Create a string and append text to it

Concatenate with & operator

Dim str as String  'no need to create a string instance
str = "Hello " & "World"

You can concate with the + operator as well but you can get yourself into trouble when trying to concatenate numbers.

Concatenate with String.Concat()

str = String.Concat("Hello ", "World")

Useful when concatenating array of strings

StringBuilder.Append()

When concatenating large amounts of strings use StringBuilder, it will result in much better performance.

    Dim sb as new System.Text.StringBuilder()
    str = sb.Append("Hello").Append(" ").Append("World").ToString()

Strings in .NET are immutable, resulting in a new String object being instantiated for every concatenation as well a garbage collection thereof.

How to echo text during SQL script execution in SQLPLUS

You can use SET ECHO ON in the beginning of your script to achieve that, however, you have to specify your script using @ instead of < (also had to add EXIT at the end):

test.sql

SET ECHO ON

SELECT COUNT(1) FROM dual;

SELECT COUNT(1) FROM (SELECT 1 FROM dual UNION SELECT 2 FROM dual);

EXIT

terminal

sqlplus hr/oracle@orcl @/tmp/test.sql > /tmp/test.log

test.log

SQL> 
SQL> SELECT COUNT(1) FROM dual;

  COUNT(1)
----------
     1

SQL> 
SQL> SELECT COUNT(1) FROM (SELECT 1 FROM dual UNION SELECT 2 FROM dual);

  COUNT(1)
----------
     2

SQL> 
SQL> EXIT

Force flushing of output to a file while bash script is still running

You can use tee to write to the file without the need for flushing.

/homedir/MyScript 2>&1 | tee some_log.log > /dev/null

How to convert an entire MySQL database characterset and collation to UTF-8?

On the commandline shell

If you're one the commandline shell, you can do this very quickly. Just fill in "dbname" :D

DB="dbname"
(
    echo 'ALTER DATABASE `'"$DB"'` CHARACTER SET utf8 COLLATE utf8_general_ci;'
    mysql "$DB" -e "SHOW TABLES" --batch --skip-column-names \
    | xargs -I{} echo 'ALTER TABLE `'{}'` CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;'
) \
| mysql "$DB"

One-liner for simple copy/paste

DB="dbname"; ( echo 'ALTER DATABASE `'"$DB"'` CHARACTER SET utf8 COLLATE utf8_general_ci;'; mysql "$DB" -e "SHOW TABLES" --batch --skip-column-names | xargs -I{} echo 'ALTER TABLE `'{}'` CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;' ) | mysql "$DB"

Turn ON/OFF Camera LED/flash light in Samsung Galaxy Ace 2.2.1 & Galaxy Tab

I will soon released a new version of my app to support to galaxy ace.

You can download here: https://play.google.com/store/apps/details?id=droid.pr.coolflashlightfree

In order to solve your problem you should do this:

this._camera = Camera.open();     
this._camera.startPreview();
this._camera.autoFocus(new AutoFocusCallback() {
public void onAutoFocus(boolean success, Camera camera) {
}
});

Parameters params = this._camera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_ON);
this._camera.setParameters(params);

params = this._camera.getParameters();
params.setFlashMode(Parameters.FLASH_MODE_OFF);
this._camera.setParameters(params);

don't worry about FLASH_MODE_OFF because this will keep the light on, strange but it's true

to turn off the led just release the camera

How to add a new row to datagridview programmatically

Like this:

 dataGridView1.Columns[0].Name = "column2";
 dataGridView1.Columns[1].Name = "column6";

 string[] row1 = new string[] { "column2 value", "column6 value" };
 dataGridView1.Rows.Add(row1);

Or you need to set there values individually use the propery .Rows(), like this:

 dataGridView1.Rows[1].Cells[0].Value = "cell value";

WCF Service , how to increase the timeout?

The timeout configuration needs to be set at the client level, so the configuration I was setting in the web.config had no effect, the WCF test tool has its own configuration and there is where you need to set the timeout.

Custom pagination view in Laravel 5

Laravel 5.2 uses presenters for this. You can create custom presenters or use the predefined ones. Laravel 5.2 uses the BootstrapThreePrensenter out-of-the-box, but it's easy to use the BootstrapFroutPresenter or any other custom presenters for that matter.

public function index()
{
    return view('pages.guestbook',['entries'=>GuestbookEntry::paginate(25)]);
}

In your blade template, you can use the following formula:

{!! $entries->render(new \Illuminate\Pagination\BootstrapFourPresenter($entries)) !!}

For creating custom presenters I recommend watching Codecourse's video about this.

Node.js: for each … in not working

for (var i in conf) {
  val = conf[i];
  console.log(val.path);
}

How can I echo a newline in a batch file?

Just like Grimtron suggests - here is a quick example to define it:

@echo off
set newline=^& echo.
echo hello %newline%world

Output

C:\>test.bat
hello
world

How to find files modified in last x minutes (find -mmin does not work as expected)

I am working through the same need and I believe your timeframe is incorrect.

Try these:

15min change: find . -mtime -.01
1hr change: find . -mtime -.04
12 hr change: find . -mtime -.5

You should be using 24 hours as your base. The number after -mtime should be relative to 24 hours. Thus -.5 is the equivalent of 12 hours, because 12 hours is half of 24 hours.

java.net.ConnectException: failed to connect to /192.168.253.3 (port 2468): connect failed: ECONNREFUSED (Connection refused)

Why this might have happened:

The server couldn't send a response: Ensure that the backend is working properly at IP and port mentioned.
SSL connections are being blocked: Fix this by importing SSL certificates

Less likely:

Cookies not being sent
Request timeout: Change request timeout

css selector to match an element without attribute x

Just wanted to add to this, you can have the :not selector in oldIE using selectivizr: http://selectivizr.com/

Check if string matches pattern

One-liner: re.match(r"pattern", string) # No need to compile

import re
>>> if re.match(r"hello[0-9]+", 'hello1'):
...     print('Yes')
... 
Yes

You can evalute it as bool if needed

>>> bool(re.match(r"hello[0-9]+", 'hello1'))
True

How to make a <div> always full screen?

This is the most stable (and easy) way to do it, and it works in all modern browsers:

_x000D_

.fullscreen {_x000D_
  position: fixed;_x000D_
  top: 0;_x000D_
  left: 0;_x000D_
  bottom: 0;_x000D_
  right: 0;_x000D_
  overflow: auto;_x000D_
  background: lime; /* Just to visualize the extent */_x000D_
  _x000D_
}

_x000D_

<div class="fullscreen">_x000D_
  Suspendisse aliquam in ante a ornare. Pellentesque quis sapien sit amet dolor euismod congue. Donec non semper arcu. Sed tortor ante, cursus in dui vitae, interdum vestibulum massa. Suspendisse aliquam in ante a ornare. Pellentesque quis sapien sit amet dolor euismod congue. Donec non semper arcu. Sed tortor ante, cursus in dui vitae, interdum vestibulum massa. Suspendisse aliquam in ante a ornare. Pellentesque quis sapien sit amet dolor euismod congue. Donec non semper arcu. Sed tortor ante, cursus in dui vitae, interdum vestibulum massa. Suspendisse aliquam in ante a ornare. Pellentesque quis sapien sit amet dolor euismod congue. Donec non semper arcu. Sed tortor ante, cursus in dui vitae, interdum vestibulum massa._x000D_
</div>

_x000D_

_{Tested to work in Firefox, Chrome, Opera, Vivaldi, IE7+ (based on emulation in IE11).}

How do I pass a string into subprocess.Popen (using the stdin argument)?

Popen.communicate() documentation:

Note that if you want to send data to the process’s stdin, you need to create the Popen object with stdin=PIPE. Similarly, to get anything other than None in the result tuple, you need to give stdout=PIPE and/or stderr=PIPE too.

Replacing os.popen*

    pipe = os.popen(cmd, 'w', bufsize)
    # ==>
    pipe = Popen(cmd, shell=True, bufsize=bufsize, stdin=PIPE).stdin

Warning Use communicate() rather than stdin.write(), stdout.read() or stderr.read() to avoid deadlocks due to any of the other OS pipe buffers filling up and blocking the child process.

So your example could be written as follows:

from subprocess import Popen, PIPE, STDOUT

p = Popen(['grep', 'f'], stdout=PIPE, stdin=PIPE, stderr=STDOUT)    
grep_stdout = p.communicate(input=b'one\ntwo\nthree\nfour\nfive\nsix\n')[0]
print(grep_stdout.decode())
# -> four
# -> five
# ->

On Python 3.5+ (3.6+ for encoding), you could use subprocess.run, to pass input as a string to an external command and get its exit status, and its output as a string back in one call:

#!/usr/bin/env python3
from subprocess import run, PIPE

p = run(['grep', 'f'], stdout=PIPE,
        input='one\ntwo\nthree\nfour\nfive\nsix\n', encoding='ascii')
print(p.returncode)
# -> 0
print(p.stdout)
# -> four
# -> five
# ->

C# ASP.NET Send Email via TLS

TLS (Transport Level Security) is the slightly broader term that has replaced SSL (Secure Sockets Layer) in securing HTTP communications. So what you are being asked to do is enable SSL.

Error in plot.window(...) : need finite 'xlim' values

I had the same problem. My solution was to make all vectors numeric.

SQL multiple column ordering

SELECT  *
FROM    mytable
ORDER BY
        column1 DESC, column2 ASC

Pass PDO prepared statement to variables

You could do $stmt->queryString to obtain the SQL query used in the statement. If you want to save the entire $stmt variable (I can't see why), you could just copy it. It is an instance of PDOStatement so there is apparently no advantage in storing it.

Android Room - simple select query - Cannot access database on the main thread

Just do the database operations in a separate Thread. Like this (Kotlin):

Thread {
   //Do your database´s operations here
}.start()

Saving lists to txt file

Framework 4: no need to use StreamWriter:

System.IO.File.WriteAllLines("SavedLists.txt", Lists.verbList);

get all the elements of a particular form

I could have sworn there used to be a convenient fields property on a form but … Must have been my imagination.

I just do this (for <form name="my_form"></form>) because I usually don't want fieldsets themselves:

let fields = Array.from(document.forms.my_form.querySelectorAll('input, select, textarea'));

How to create a custom navigation drawer in android

Android Navigation Drawer using Activity I just followed the example :http://antonioleiva.com/navigation-view/

You just need few Customization:

public class MainActivity extends AppCompatActivity  {

public static final String AVATAR_URL = "http://lorempixel.com/200/200/people/1/";


private DrawerLayout drawerLayout;
private View content;
private Toolbar toolbar;
private NavigationView navigationView;
private ActionBarDrawerToggle drawerToggle;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_dashboard);
    toolbar = (Toolbar) findViewById(R.id.toolbar);
    drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    initToolbar();
    setupDrawerLayout();

    content = findViewById(R.id.content);
    drawerToggle = setupDrawerToggle();
    final ImageView avatar = (ImageView) navigationView.getHeaderView(0).findViewById(R.id.avatar);
    Picasso.with(this).load(AVATAR_URL).transform(new CircleTransform()).into(avatar);


}


private void initToolbar() {
    final Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    final ActionBar actionBar = getSupportActionBar();

    if (actionBar != null) {
        actionBar.setHomeAsUpIndicator(R.drawable.ic_menu_black_24dp);
        actionBar.setDisplayHomeAsUpEnabled(true);
    }
}
private ActionBarDrawerToggle setupDrawerToggle() {
    return new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.drawer_open,  R.string.drawer_close);
}

   @Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    // Sync the toggle state after onRestoreInstanceState has occurred.
    drawerToggle.syncState();
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    // Pass any configuration change to the drawer toggles
    drawerToggle.onConfigurationChanged(newConfig);
}
 private void setupDrawerLayout() {

    drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
    navigationView = (NavigationView) findViewById(R.id.navigation_view);

    navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {

        @Override
        public boolean onNavigationItemSelected(MenuItem menuItem) {

            int id = menuItem.getItemId();

          switch (id) {
                case R.id.drawer_home:
                    Intent i = new Intent(getApplicationContext(), MainActivity.class);
                    startActivity(i);
                    finish();
                    break;
                case R.id.drawer_favorite:
                    Intent j = new Intent(getApplicationContext(), SecondActivity.class);
                    startActivity(j);
                    finish();
                    break;

            }


        return true;
    }
});

} Here is the xml Layout

<android.support.v4.widget.DrawerLayout
android:id="@+id/drawer_layout"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".MainActivity">

<FrameLayout
    android:id="@+id/content"
    android:layout_width="match_parent"
    android:layout_height="match_parent">



    <android.support.design.widget.AppBarLayout
        android:id="@+id/appBarLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
            app:layout_scrollFlags="scroll|enterAlways|snap" />

    </android.support.design.widget.AppBarLayout>



</FrameLayout>

<android.support.design.widget.NavigationView
    android:id="@+id/navigation_view"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    app:headerLayout="@layout/drawer_header"
    app:menu="@menu/drawer"/>

Add drawer.xml in menu

<menu xmlns:android="http://schemas.android.com/apk/res/android">

<group
    android:checkableBehavior="single">

    <item
        android:id="@+id/drawer_home"
        android:checked="true"
        android:icon="@drawable/ic_home_black_24dp"
        android:title="@string/home"/>

    <item
        android:id="@+id/drawer_favourite"
        android:icon="@drawable/ic_favorite_black_24dp"
        android:title="@string/favourite"/>
    ...

    <item
        android:id="@+id/drawer_settings"
        android:icon="@drawable/ic_settings_black_24dp"
        android:title="@string/settings"/>

</group>

To open and close drawer add this values in string.xml

<string name="drawer_open">Open</string>
<string name="drawer_close">Close</string>

drawer.xml

enter code here

<ImageView
    android:id="@+id/avatar"
    android:layout_width="64dp"
    android:layout_height="64dp"
    android:layout_margin="@dimen/spacing_large"
    android:elevation="4dp"
    tools:src="@drawable/ic_launcher"/>

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/email"
    android:layout_marginLeft="@dimen/spacing_large"
    android:layout_marginStart="@dimen/spacing_large"
    android:text="Username"
    android:textAppearance="@style/TextAppearance.AppCompat.Body2"/>
<TextView
    android:id="@+id/email"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_marginLeft="@dimen/spacing_large"
    android:layout_marginStart="@dimen/spacing_large"
    android:layout_marginBottom="@dimen/spacing_large"
    android:text="[email protected]"
    android:textAppearance="@style/TextAppearance.AppCompat.Body1"/>

How to clear textarea on click?

The best solution what I know so far:

<textarea name="message" onblur="if (this.value == '') {this.value = 'text here';}"   onfocus="if (this.value == 'text here') {this.value = '';}">text here</textarea>

How do you create vectors with specific intervals in R?

Usually, we want to divide our vector into a number of intervals. In this case, you can use a function where (a) is a vector and (b) is the number of intervals. (Let's suppose you want 4 intervals)

a <- 1:10
b <- 4

FunctionIntervalM <- function(a,b) {
  seq(from=min(a), to = max(a), by = (max(a)-min(a))/b)
}

FunctionIntervalM(a,b)
# 1.00  3.25  5.50  7.75 10.00

Therefore you have 4 intervals:

1.00 - 3.25 
3.25 - 5.50
5.50 - 7.75
7.75 - 10.00

You can also use a cut function

  cut(a, 4)

# (0.991,3.25] (0.991,3.25] (0.991,3.25] (3.25,5.5]   (3.25,5.5]   (5.5,7.75]  
# (5.5,7.75]   (7.75,10]    (7.75,10]    (7.75,10]   
#Levels: (0.991,3.25] (3.25,5.5] (5.5,7.75] (7.75,10]

Using Apache POI how to read a specific excel column

You could just loop the rows and read the same cell from each row (doesn't this comprise a column?).

add new row in gridview after binding C#, ASP.net

protected void TableGrid_RowDataBound(object sender, GridViewRowEventArgs e)
{
   if (e.Row.RowIndex == -1 && e.Row.RowType == DataControlRowType.Header)
   {
      GridViewRow gvRow = new GridViewRow(0, 0, DataControlRowType.DataRow,DataControlRowState.Insert);
      for (int i = 0; i < e.Row.Cells.Count; i++)
      {
         TableCell tCell = new TableCell();
         tCell.Text = "&nbsp;";
         gvRow.Cells.Add(tCell);
         Table tbl = e.Row.Parent as Table;
         tbl.Rows.Add(gvRow);
      }
   }
}

How to read a file byte by byte in Python and how to print a bytelist as a binary?

Late to the party, but this may help anyone looking for a quick solution:

you can use bin(ord('b')).replace('b', '')bin() it gives you the binary representation with a 'b' after the last bit, you have to remove it. Also ord() gives you the ASCII number to the char or 8-bit/1 Byte coded character.

Cheers

Skip certain tables with mysqldump

You can use the --ignore-table option. So you could do

mysqldump -u USERNAME -pPASSWORD DATABASE --ignore-table=DATABASE.table1 > database.sql

There is no whitespace after -p (this is not a typo).

To ignore multiple tables, use this option multiple times, this is documented to work since at least version 5.0.

If you want an alternative way to ignore multiple tables you can use a script like this:

#!/bin/bash
PASSWORD=XXXXXX
HOST=XXXXXX
USER=XXXXXX
DATABASE=databasename
DB_FILE=dump.sql
EXCLUDED_TABLES=(
table1
table2
table3
table4
tableN   
)
 
IGNORED_TABLES_STRING=''
for TABLE in "${EXCLUDED_TABLES[@]}"
do :
   IGNORED_TABLES_STRING+=" --ignore-table=${DATABASE}.${TABLE}"
done

echo "Dump structure"
mysqldump --host=${HOST} --user=${USER} --password=${PASSWORD} --single-transaction --no-data --routines ${DATABASE} > ${DB_FILE}

echo "Dump content"
mysqldump --host=${HOST} --user=${USER} --password=${PASSWORD} ${DATABASE} --no-create-info --skip-triggers ${IGNORED_TABLES_STRING} >> ${DB_FILE}

Finding moving average from data points in Python

My Moving Average function, without numpy function:

from __future__ import division  # must be on first line of script

class Solution:
    def Moving_Avg(self,A):
        m = A[0]
        B = []
        B.append(m)
        for i in range(1,len(A)):
            m = (m * i + A[i])/(i+1)
            B.append(m)
        return B

How to turn a String into a JavaScript function call?

In javascript that uses the CommonJS spec, like node.js for instance you can do what I show below. Which is pretty handy for accessing a variable by a string even if its not defined on the window object. If there is a class named MyClass, defined within a CommonJS module named MyClass.js

// MyClass.js
var MyClass = function() {
    // I do stuff in here. Probably return an object
    return {
       foo: "bar"
    }
}

module.exports = MyClass;

You can then do this nice bit o witchcraft from another file called MyOtherFile.js

// MyOtherFile.js

var myString = "MyClass";

var MyClass = require('./' + myString);
var obj = new MyClass();

console.log(obj.foo); // returns "bar"

One more reason why CommonJS is such a pleasure.

Controlling a USB power supply (on/off) with Linux

echo '2-1' |sudo tee /sys/bus/usb/drivers/usb/unbind

works for ubuntu

SEVERE: ContainerBase.addChild: start:org.apache.catalina.LifecycleException: Failed to start error

I had a similar problem when deploying one of my portlets. The portlet has been developed for Liferay 6.2 on Windows. My runtime environment is Tomcat 7 running on JRE 1.6 (JRockit 1.6). I have recently migrated to Eclipse 2019-3. I checked my Java Build Path (Project->Properties, Libraries tab). I noticed that the Apache Tomcat that is specified in the list of JARs and class folders on the build path was unbound. I selected that item. I clicked on the Edit button. Server Libary dialog was opened. I selected the correct Apache Tomcat. After applying the change, I redeployed the portlet and the problem was resolved.

Sometimes you may need to delete the problematic portlet from the [Tomcat]/webapps directory before deploying the corrected portlet. Also, sometimes I have experienced that deployment of a portlet takes more than usual, and redeploying it resolves the issue.

Left/Right float button inside div

Change display:inline to display:inline-block

.test {
  width:200px;
  display:inline-block;
  overflow: auto;
  white-space: nowrap;
  margin:0px auto;
  border:1px red solid;
}

How to convert a UTF-8 string into Unicode?

So the issue is that UTF-8 code unit values have been stored as a sequence of 16-bit code units in a C# string. You simply need to verify that each code unit is within the range of a byte, copy those values into bytes, and then convert the new UTF-8 byte sequence into UTF-16.

public static string DecodeFromUtf8(this string utf8String)
{
    // copy the string as UTF-8 bytes.
    byte[] utf8Bytes = new byte[utf8String.Length];
    for (int i=0;i<utf8String.Length;++i) {
        //Debug.Assert( 0 <= utf8String[i] && utf8String[i] <= 255, "the char must be in byte's range");
        utf8Bytes[i] = (byte)utf8String[i];
    }

    return Encoding.UTF8.GetString(utf8Bytes,0,utf8Bytes.Length);
}

DecodeFromUtf8("d\u00C3\u00A9j\u00C3\u00A0"); // déjà

This is easy, however it would be best to find the root cause; the location where someone is copying UTF-8 code units into 16 bit code units. The likely culprit is somebody converting bytes into a C# string using the wrong encoding. E.g. Encoding.Default.GetString(utf8Bytes, 0, utf8Bytes.Length).

Alternatively, if you're sure you know the incorrect encoding which was used to produce the string, and that incorrect encoding transformation was lossless (usually the case if the incorrect encoding is a single byte encoding), then you can simply do the inverse encoding step to get the original UTF-8 data, and then you can do the correct conversion from UTF-8 bytes:

public static string UndoEncodingMistake(string mangledString, Encoding mistake, Encoding correction)
{
    // the inverse of `mistake.GetString(originalBytes);`
    byte[] originalBytes = mistake.GetBytes(mangledString);
    return correction.GetString(originalBytes);
}

UndoEncodingMistake("d\u00C3\u00A9j\u00C3\u00A0", Encoding(1252), Encoding.UTF8);

Read response headers from API response - Angular 5 + TypeScript

Angular 7 Service:

    this.http.post(environment.urlRest + '/my-operation',body, { headers: headers, observe: 'response'});

Component:

    this.myService.myfunction().subscribe(
          (res: HttpResponse) => {
              console.log(res.headers.get('x-token'));
                }  ,
        error =>{
        })

Laravel - display a PDF file in storage without forcing download?

In Laravel 5.5 you can just pass "inline" as the disposition parameter of the download function:

return response()->download('/path/to/file.pdf', 'example.pdf', [], 'inline');

What does the 'b' character do in front of a string literal?

To quote the Python 2.x documentation:

A prefix of 'b' or 'B' is ignored in Python 2; it indicates that the literal should become a bytes literal in Python 3 (e.g. when code is automatically converted with 2to3). A 'u' or 'b' prefix may be followed by an 'r' prefix.

The Python 3 documentation states:

Bytes literals are always prefixed with 'b' or 'B'; they produce an instance of the bytes type instead of the str type. They may only contain ASCII characters; bytes with a numeric value of 128 or greater must be expressed with escapes.

Draw a curve with css

You could use an asymmetrical border to make curves with CSS.

border-radius: 50%/100px 100px 0 0;

VIEW DEMO

_x000D_

.box {_x000D_
  width: 500px; _x000D_
  height: 100px;  _x000D_
  border: solid 5px #000;_x000D_
  border-color: #000 transparent transparent transparent;_x000D_
  border-radius: 50%/100px 100px 0 0;_x000D_
}

_x000D_

<div class="box"></div>

_x000D_

Testing web application on Mac/Safari when I don't own a Mac

For my case (a small, personal project) https://www.lambdatest.com/ was very helpful. Free tier allows for 6 sessions per month.

How do I remove a single file from the staging area (undo git add)?

In case you just want to remove a subset of the changes to your file, you can use:

git reset -p

git reset -p <file_name>

This command is basically the reverse of git add -p: it will only remove the selected changes from the staging area. I find it extremely useful in "unadding" something that I added by mistake.

PHPUnit assert that an exception was thrown?

function yourfunction($a,$z){
   if($a<$z){ throw new <YOUR_EXCEPTION>; }
}

here is the test

class FunctionTest extends \PHPUnit_Framework_TestCase{

   public function testException(){

      $this->setExpectedException(<YOUR_EXCEPTION>::class);
      yourfunction(1,2);//add vars that cause the exception 

   }

}

Pass accepts header parameter to jquery ajax

You had already identified the accepts parameter as the one you wanted and keyur is right in showing you the correct way to set it, but if you set DataType to "json" then it will automatically set the default value of accepts to the value you want as per the jQuery reference. So all you need is:

jQuery.ajax({
    url: _this.attr('href'),
    dataType: "json"
});

Asserting successive calls to a mock method

assert_has_calls is another approach to this problem.

From the docs:

assert_has_calls (calls, any_order=False)

assert the mock has been called with the specified calls. The mock_calls list is checked for the calls.

If any_order is False (the default) then the calls must be sequential. There can be extra calls before or after the specified calls.

If any_order is True then the calls can be in any order, but they must all appear in mock_calls.

Example:

>>> from unittest.mock import call, Mock
>>> mock = Mock(return_value=None)
>>> mock(1)
>>> mock(2)
>>> mock(3)
>>> mock(4)
>>> calls = [call(2), call(3)]
>>> mock.assert_has_calls(calls)
>>> calls = [call(4), call(2), call(3)]
>>> mock.assert_has_calls(calls, any_order=True)

Source: https://docs.python.org/3/library/unittest.mock.html#unittest.mock.Mock.assert_has_calls

Linking a UNC / Network drive on an html page

Setup IIS on the network server and change the path to http://server/path/to/file.txt

EDIT: Make sure you enable directory browsing in IIS

Does JSON syntax allow duplicate keys in an object?

It's not defined in the ECMA JSON standard. And generally speaking, a lack of definition in a standard means, "Don't count on this working the same way everywhere."

If you're a gambler, "many" JSON engines will allow duplication and simply use the last-specified value. This:

var o = {"a": 1, "b": 2, "a": 3}

Becomes this:

Object {a: 3, b: 2}

But if you're not a gambler, don't count on it!

Is it correct to use alt tag for an anchor link?

I used title and it worked!

The title attribute gives the title of the link. With one exception, it is purely advisory. The value is text. The exception is for style sheet links, where the title attribute defines alternative style sheet sets.

<a class="navbar-brand" href="http://www.alberghierocastelnuovocilento.gov.it/sito/index.php" title="sito dell'Istituto Ancel Keys">A.K.</a>

How do I hide javascript code in a webpage?

It's possible. But it's viewable anyway.

You can make this tool for yourself:

_x000D_

const btn = document.querySelector('.btn');
btn.onclick = textRead;
const copy = document.querySelector('.copy');
copy.onclick = Copy;
const file = document.querySelector('.file');
file.type = 'file';
const pre = document.querySelector('.pre');

var pretxt = pre;

if (pre.innerHTML == "") {
    copy.hidden = true;
}

function textRead() {
    let file = document.querySelector('.file').files[0];
    let read = new FileReader();
    read.addEventListener('load', function(e) {
        let data = e.target.result;
        pre.textContent = data;
    });
    read.readAsDataURL(file);
    copy.hidden = false;
}

function Copy() {
    var text = pre;
    var selection = window.getSelection();
    var range = document.createRange();
    range.selectNodeContents(text);
    selection.addRange(range);
    document.execCommand('copy');
    selection.removeAllRanges();
}

_x000D_

<input class="file" />
<br>
<button class="btn">Read File</button>
<pre class="pre"></pre>
<button class="copy">Copy</button>

_x000D_

How to use this tool?

Create a JavaScript file.
Go in the tool and choose your JavaScript file.
Copy result.
Paste the result in Notepad.
Remove data:text/javascript;base64,.
Paste eval(atob('Notepad Text')) to your code and change Notepad Text to your Notepad text result.

How to view this hidden code?

Copy the hidden code and paste it in Notepad.
Copy a string that after eval and atob.
Paste data:text/javascript;base64,String and change String to your copied string.

How to select specified node within Xpath node sets by index with Selenium?

There is no i in XPath.

Either you use literal numbers: //img[@title='Modify'][1]

Or you build the expression string dynamically: '//img[@title='Modify']['+i+']' (but keep in mind that dynamic XPath expressions do not work from within XSLT).

Or does XPath support specified selection of nodes which are not under same parent node?

Yes: (//img[@title='Modify'])[13]

This //img[@title='Modify'][i] means "any <img> with a title of 'Modify' and a child element named <i>."

How do you set the document title in React?

Since React 16.8. you can build a custom hook to do so (similar to the solution of @Shortchange):

export function useTitle(title) {
  useEffect(() => {
    const prevTitle = document.title
    document.title = title
    return () => {
      document.title = prevTitle
    }
  })
}

this can be used in any react component, e.g.:

const MyComponent = () => {
  useTitle("New Title")
  return (
    <div>
     ...
    </div>
  )
}

It will update the title as soon as the component mounts and reverts it to the previous title when it unmounts.

Android how to use Environment.getExternalStorageDirectory()

Have in mind though, that getExternalStorageDirectory() is not going to work properly on some phones e.g. my Motorola razr maxx, as it has 2 cards /mnt/sdcard and /mnt/sdcard-ext - for internal and external SD cards respectfully. You will be getting the /mnt/sdcard only reply every time. Google must provide a way to deal with such a situation. As it renders many SD card aware apps (i.e card backup) failing miserably on these phones.

Which programming language for cloud computing?

Of the languages you mention Java, PHP, Python, Ruby, Perl are certainly more platform independent than C/C++ (and ASP.NET).

Lots of platform-specific differences also come from what libraries are available for a given platform.

In practice however, I think you will always develop on the same or at least very similar platform (operating system flavour) as the system where your code will run, i.e. the cloud will not take source code and compile it for you before running it.

Personally I would go for Java or Python (probably also Ruby) as they have a vast number of libraries available for all kinds of tasks and are very platform independent.

MySQL Error 1093 - Can't specify target table for update in FROM clause

According to the Mysql UPDATE Syntax linked by @CheekySoft, it says right at the bottom.

Currently, you cannot update a table and select from the same table in a subquery.

I guess you are deleting from store_category while still selecting from it in the union.

Modifying a subset of rows in a pandas dataframe

To replace multiples columns convert to numpy array using .values:

df.loc[df.A==0, ['B', 'C']] = df.loc[df.A==0, ['B', 'C']].values / 2

find path of current folder - cmd

2015-03-30: Edited - Missing information has been added

To retrieve the current directory you can use the dynamic %cd% variable that holds the current active directory

set "curpath=%cd%"

This generates a value with a ending backslash for the root directory, and without a backslash for the rest of directories. You can force and ending backslash for any directory with

for %%a in ("%cd%\") do set "curpath=%%~fa"

Or you can use another dynamic variable: %__CD__% that will return the current active directory with an ending backslash.

Also, remember the %cd% variable can have a value directly assigned. In this case, the value returned will not be the current directory, but the assigned value. You can prevent this with a reference to the current directory

for %%a in (".\") do set "curpath=%%~fa"

Up to windows XP, the %__CD__% variable has the same behaviour. It can be overwritten by the user, but at least from windows 7 (i can't test it on Vista), any change to the %__CD__% is allowed but when the variable is read, the changed value is ignored and the correct current active directory is retrieved (note: the changed value is still visible using the set command).

BUT all the previous codes will return the current active directory, not the directory where the batch file is stored.

set "curpath=%~dp0"

It will return the directory where the batch file is stored, with an ending backslash.

BUT this will fail if in the batch file the shift command has been used

shift
echo %~dp0

As the arguments to the batch file has been shifted, the %0 reference to the current batch file is lost.

To prevent this, you can retrieve the reference to the batch file before any shifting, or change the syntax to shift /1 to ensure the shift operation will start at the first argument, not affecting the reference to the batch file. If you can not use any of this options, you can retrieve the reference to the current batch file in a call to a subroutine

@echo off
    setlocal enableextensions

    rem Destroy batch file reference
    shift
    echo batch folder is "%~dp0"

    rem Call the subroutine to get the batch folder 
    call :getBatchFolder batchFolder
    echo batch folder is "%batchFolder%"

    exit /b

:getBatchFolder returnVar
    set "%~1=%~dp0" & exit /b

This approach can also be necessary if when invoked the batch file name is quoted and a full reference is not used (read here).

Create Setup/MSI installer in Visual Studio 2017

Other answers posted here for this question did not work for me using the latest Visual Studio 2017 Enterprise edition (as of 2018-09-18).

Instead, I used this method:

Close all but one instance of Visual Studio.
In the running instance, access the menu Tools->Extensions and Updates.
In that dialog, choose Online->Visual Studio Marketplace->Tools->Setup & Deployment.
From the list that appears, select Microsoft Visual Studio 2017 Installer Projects.

Once installed, close and restart Visual Studio. Go to File->New Project and search for the word Installer. You'll know you have the correct templates installed if you see a list that looks something like this:

JavaFX FXML controller - constructor vs initialize method

The initialize method is called after all @FXML annotated members have been injected. Suppose you have a table view you want to populate with data:

class MyController { 
    @FXML
    TableView<MyModel> tableView; 

    public MyController() {
        tableView.getItems().addAll(getDataFromSource()); // results in NullPointerException, as tableView is null at this point. 
    }

    @FXML
    public void initialize() {
        tableView.getItems().addAll(getDataFromSource()); // Perfectly Ok here, as FXMLLoader already populated all @FXML annotated members. 
    }
}

Replace non ASCII character from string

This will search and replace all non ASCII letters:

String resultString = subjectString.replaceAll("[^\\x00-\\x7F]", "");

How can I parse a String to BigDecimal?

Try the correct constructor http://docs.oracle.com/javase/7/docs/api/java/math/BigDecimal.html#BigDecimal(java.lang.String)

You can directly instanciate the BigDecimal with the String ;)

Example:

BigDecimal bigDecimalValue= new BigDecimal("0.5");

How to listen to route changes in react router v4?

You should to use history v4 lib.

Example from there

history.listen((location, action) => {
  console.log(`The current URL is ${location.pathname}${location.search}${location.hash}`)
  console.log(`The last navigation action was ${action}`)
})

In an array of objects, fastest way to find the index of an object whose attributes match a search

array.forEach(function (elem, i) {  // iterate over all elements of array
    indexes[elem.id] = i;           // take the found id as index for the
});                                 // indexes array and assign i

the result is a look up list for the id. with the given id we get the index of the record.

How to display all methods of an object?

You can use Object.getOwnPropertyNames() to get all properties that belong to an object, whether enumerable or not. For example:

console.log(Object.getOwnPropertyNames(Math));
//-> ["E", "LN10", "LN2", "LOG2E", "LOG10E", "PI", ...etc ]

You can then use filter() to obtain only the methods:

console.log(Object.getOwnPropertyNames(Math).filter(function (p) {
    return typeof Math[p] === 'function';
}));
//-> ["random", "abs", "acos", "asin", "atan", "ceil", "cos", "exp", ...etc ]

In ES3 browsers (IE 8 and lower), the properties of built-in objects aren't enumerable. Objects like window and document aren't built-in, they're defined by the browser and most likely enumerable by design.

From ECMA-262 Edition 3:

Global Object
There is a unique global object (15.1), which is created before control enters any execution context. Initially the global object has the following properties:

• Built-in objects such as Math, String, Date, parseInt, etc. These have attributes { DontEnum }.
• Additional host defined properties. This may include a property whose value is the global object itself; for example, in the HTML document object model the window property of the global object is the global object itself.

As control enters execution contexts, and as ECMAScript code is executed, additional properties may be added to the global object and the initial properties may be changed.

I should point out that this means those objects aren't enumerable properties of the Global object. If you look through the rest of the specification document, you will see most of the built-in properties and methods of these objects have the { DontEnum } attribute set on them.

Update: a fellow SO user, CMS, brought an IE bug regarding { DontEnum } to my attention.

Instead of checking the DontEnum attribute, [Microsoft] JScript will skip over any property in any object where there is a same-named property in the object's prototype chain that has the attribute DontEnum.

In short, beware when naming your object properties. If there is a built-in prototype property or method with the same name then IE will skip over it when using a for...in loop.

Get city name using geolocation

You would do something like that using Google API.

Please note you must include the google maps library for this to work. Google geocoder returns a lot of address components so you must make an educated guess as to which one will have the city.

"administrative_area_level_1" is usually what you are looking for but sometimes locality is the city you are after.

Anyhow - more details on google response types can be found here and here.

Below is the code that should do the trick:

<!DOCTYPE html> 
<html> 
<head> 
<meta name="viewport" content="initial-scale=1.0, user-scalable=no"/> 
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/> 
<title>Reverse Geocoding</title> 

<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script> 
<script type="text/javascript"> 
  var geocoder;

  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(successFunction, errorFunction);
} 
//Get the latitude and the longitude;
function successFunction(position) {
    var lat = position.coords.latitude;
    var lng = position.coords.longitude;
    codeLatLng(lat, lng)
}

function errorFunction(){
    alert("Geocoder failed");
}

  function initialize() {
    geocoder = new google.maps.Geocoder();



  }

  function codeLatLng(lat, lng) {

    var latlng = new google.maps.LatLng(lat, lng);
    geocoder.geocode({'latLng': latlng}, function(results, status) {
      if (status == google.maps.GeocoderStatus.OK) {
      console.log(results)
        if (results[1]) {
         //formatted address
         alert(results[0].formatted_address)
        //find country name
             for (var i=0; i<results[0].address_components.length; i++) {
            for (var b=0;b<results[0].address_components[i].types.length;b++) {

            //there are different types that might hold a city admin_area_lvl_1 usually does in come cases looking for sublocality type will be more appropriate
                if (results[0].address_components[i].types[b] == "administrative_area_level_1") {
                    //this is the object you are looking for
                    city= results[0].address_components[i];
                    break;
                }
            }
        }
        //city data
        alert(city.short_name + " " + city.long_name)


        } else {
          alert("No results found");
        }
      } else {
        alert("Geocoder failed due to: " + status);
      }
    });
  }
</script> 
</head> 
<body onload="initialize()"> 

</body> 
</html>

Chrome net::ERR_INCOMPLETE_CHUNKED_ENCODING error

This was happening on two different clients' servers separated by several years, using the same code that was deployed on hundreds of other servers for that time without issue.

For these clients, it happened mostly on PHP scripts that had streaming HTML - that is, "Connection: close" pages where output was sent to the browser as the output became available.

It turned out that the connection between the PHP process and the web server was dropping prematurely, before the script completed and way before any timeout.

The problem was opcache.fast_shutdown = 1 in the main php.ini file. This directive is disabled by default, but it seems some server administrators believe there is a performance boost to be had here. In all of my tests, I have never noted a positive difference using this setting. In my experience, it has caused some scripts to actually execute more slowly, and has an awful track record of sometimes entering shutdown while the script is still executing, or even at the end of execution while the web server is still reading from the buffer. There is an old bug report from 2013, unresolved as of Feb 2017, which may be related: https://github.com/zendtech/ZendOptimizerPlus/issues/146

I have seen the following errors appear due to this ERR_INCOMPLETE_CHUNKED_ENCODING ERR_SPDY_PROTOCOL_ERROR Sometimes there are correlative segfaults logged; sometimes not.

If you experience either one, check your phpinfo, and make sure opcache.fast_shutdown is disabled.

Playing a MP3 file in a WinForm application

1) The most simple way would be using WMPLib

WMPLib.WindowsMediaPlayer Player;

private void PlayFile(String url)
{
    Player = new WMPLib.WindowsMediaPlayer();
    Player.PlayStateChange += Player_PlayStateChange;
    Player.URL = url;
    Player.controls.play();
}

private void Player_PlayStateChange(int NewState)
{
    if ((WMPLib.WMPPlayState)NewState == WMPLib.WMPPlayState.wmppsStopped)
    {
        //Actions on stop
    }
}

2) Alternatively you can use the open source library NAudio. It can play mp3 files using different methods and actually offers much more than just playing a file.

This is as simple as

using NAudio;
using NAudio.Wave;

IWavePlayer waveOutDevice = new WaveOut();
AudioFileReader audioFileReader = new AudioFileReader("Hadouken! - Ugly.mp3");

waveOutDevice.Init(audioFileReader);
waveOutDevice.Play();

Don't forget to dispose after the stop

waveOutDevice.Stop();
audioFileReader.Dispose();
waveOutDevice.Dispose();

How to generate a simple popup using jQuery

Check out jQuery UI Dialog. You would use it like this:

The jQuery:

$(document).ready(function() {
    $("#dialog").dialog();
});

The markup:

<div id="dialog" title="Dialog Title">I'm in a dialog</div>

Done!

Bear in mind that's about the simplest use-case there is, I would suggest reading the documentation to get a better idea of just what can be done with it.

How do I share a global variable between c files?

using extern <variable type> <variable name> in a header or another C file.

Changing factor levels with dplyr mutate

From my understanding, the currently accepted answer only changes the order of the factor levels, not the actual labels (i.e., how the levels of the factor are called). To illustrate the difference between levels and labels, consider the following example:

Turn cyl into factor (specifying levels would not be necessary as they are coded in alphanumeric order):

    mtcars2 <- mtcars %>% mutate(cyl = factor(cyl, levels = c(4, 6, 8))) 
    mtcars2$cyl[1:5]
    #[1] 6 6 4 6 8
    #Levels: 4 6 8

Change the order of levels (but not the labels itself: cyl is still the same column)

    mtcars3 <- mtcars2 %>% mutate(cyl = factor(cyl, levels = c(8, 6, 4))) 
    mtcars3$cyl[1:5]
    #[1] 6 6 4 6 8
    #Levels: 8 6 4
    all(mtcars3$cyl==mtcars2$cyl)
    #[1] TRUE

Assign new labels to cyl The order of the labels was: c(8, 6, 4), hence we specify new labels as follows:

    mtcars4 <- mtcars3 %>% mutate(cyl = factor(cyl, labels = c("new_value_for_8", 
                                                               "new_value_for_6", 
                                                               "new_value_for_4" )))
    mtcars4$cyl[1:5]
    #[1] new_value_for_6 new_value_for_6 new_value_for_4 new_value_for_6 new_value_for_8
    #Levels: new_value_for_8 new_value_for_6 new_value_for_4

Note how this column differs from our first columns:

    all(as.character(mtcars4$cyl)!=mtcars3$cyl) 
    #[1] TRUE 
    #Note: TRUE here indicates that all values are unequal because I used != instead of ==
    #as.character() was required as the levels were numeric and thus not comparable to a character vector

More details:

If we were to change the levels of cyl using mtcars2 instead of mtcars3, we would need to specify the labels differently to get the same result. The order of labels for mtcars2 was: c(4, 6, 8), hence we specify new labels as follows

    #change labels of mtcars2 (order used to be: c(4, 6, 8)
    mtcars5 <- mtcars2 %>% mutate(cyl = factor(cyl, labels = c("new_value_for_4", 
                                                               "new_value_for_6", 
                                                               "new_value_for_8" )))

Unlike mtcars3$cyl and mtcars4$cyl, the labels of mtcars4$cyl and mtcars5$cyl are thus identical, even though their levels have a different order.

    mtcars4$cyl[1:5]
    #[1] new_value_for_6 new_value_for_6 new_value_for_4 new_value_for_6 new_value_for_8
    #Levels: new_value_for_8 new_value_for_6 new_value_for_4

    mtcars5$cyl[1:5]
    #[1] new_value_for_6 new_value_for_6 new_value_for_4 new_value_for_6 new_value_for_8
    #Levels: new_value_for_4 new_value_for_6 new_value_for_8

    all(mtcars4$cyl==mtcars5$cyl)
    #[1] TRUE

    levels(mtcars4$cyl) == levels(mtcars5$cyl)
    #1] FALSE  TRUE FALSE

Loading cross-domain endpoint with AJAX

Figured it out. Used this instead.

$('.div_class').load('http://en.wikipedia.org/wiki/Cross-origin_resource_sharing #toctitle');

Printing out all the objects in array list

Override toString() method in Student class as below:

   @Override
   public String toString() {
        return ("StudentName:"+this.getStudentName()+
                    " Student No: "+ this.getStudentNo() +
                    " Email: "+ this.getEmail() +
                    " Year : " + this.getYear());
   }

Redirecting Output from within Batch file

Add these two lines near the top of your batch file, all stdout and stderr after will be redirected to log.txt:

if not "%1"=="STDOUT_TO_FILE"  %0 STDOUT_TO_FILE %*  >log.txt 2>&1
shift /1

Comparing two hashmaps for equal values and same key sets?

public boolean compareMap(Map<String, String> map1, Map<String, String> map2) {

    if (map1 == null || map2 == null)
        return false;

    for (String ch1 : map1.keySet()) {
        if (!map1.get(ch1).equalsIgnoreCase(map2.get(ch1)))
            return false;

    }
    for (String ch2 : map2.keySet()) {
        if (!map2.get(ch2).equalsIgnoreCase(map1.get(ch2)))
            return false;

    }

    return true;
}

IIS7 Permissions Overview - ApplicationPoolIdentity

I fixed all my asp.net problems simply by creating a new user called IUSER with a password and added it the Network Service and User Groups. Then create all your virtual sites and applications set authentication to IUSER with its password.. set high level file access to include IUSER and BAM it fixed at least 3-4 issues including this one..

Dave

Access index of the parent ng-repeat from child ng-repeat

My example code was correct and the issue was something else in my actual code. Still, I know it was difficult to find examples of this so I'm answering it in case someone else is looking.

<div ng-repeat="f in foos">
  <div>
    <div ng-repeat="b in foos.bars">
      <a ng-click="addSomething($parent.$index)">Add Something</a>
    </div>
  </div>
</div>

Best Way to read rss feed in .net Using C#

This is an old post, but to save people some time if you get here now like I did, I suggest you have a look at the CodeHollow.FeedReader package which supports a wider range of RSS versions, is easier to use and seems more robust. https://github.com/codehollow/FeedReader

jquery - return value using ajax result on success

// Common ajax caller
function AjaxCall(url,successfunction){
  var targetUrl=url;
  $.ajax({
    'url': targetUrl,
    'type': 'GET',
    'dataType': 'json',
    'success': successfunction,
    'error': function() {
      alert("error");
    }
  });
}

// Calling Ajax
$(document).ready(function() {
  AjaxCall("productData.txt",ajaxSuccessFunction);
});

// Function details of success function
function ajaxSuccessFunction(d){
  alert(d.Pioneer.Product[0].category);
}

it may help, create a common ajax call function and attach a function which invoke when success the ajax call, see the example

Escape string for use in Javascript regex

Short 'n Sweet

function escapeRegExp(string) {
  return string.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); // $& means the whole matched string
}

Example

escapeRegExp("All of these should be escaped: \ ^ $ * + ? . ( ) | { } [ ]");

>>> "All of these should be escaped: \\ \^ \$ \* \+ \? \. \( \) \| \{ \} \[ \] "

(NOTE: the above is not the original answer; it was edited to show the one from MDN. This means it does not match what you will find in the code in the below npm, and does not match what is shown in the below long answer. The comments are also now confusing. My recommendation: use the above, or get it from MDN, and ignore the rest of this answer. -Darren,Nov 2019)

Install

Available on npm as escape-string-regexp

npm install --save escape-string-regexp

Note

See MDN: Javascript Guide: Regular Expressions

Other symbols (~`!@# ...) MAY be escaped without consequence, but are not required to be.

Test Case: A typical url

escapeRegExp("/path/to/resource.html?search=query");

>>> "\/path\/to\/resource\.html\?search=query"

The Long Answer

If you're going to use the function above at least link to this stack overflow post in your code's documentation so that it doesn't look like crazy hard-to-test voodoo.

var escapeRegExp;

(function () {
  // Referring to the table here:
  // https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/regexp
  // these characters should be escaped
  // \ ^ $ * + ? . ( ) | { } [ ]
  // These characters only have special meaning inside of brackets
  // they do not need to be escaped, but they MAY be escaped
  // without any adverse effects (to the best of my knowledge and casual testing)
  // : ! , = 
  // my test "~!@#$%^&*(){}[]`/=?+\|-_;:'\",<.>".match(/[\#]/g)

  var specials = [
        // order matters for these
          "-"
        , "["
        , "]"
        // order doesn't matter for any of these
        , "/"
        , "{"
        , "}"
        , "("
        , ")"
        , "*"
        , "+"
        , "?"
        , "."
        , "\\"
        , "^"
        , "$"
        , "|"
      ]

      // I choose to escape every character with '\'
      // even though only some strictly require it when inside of []
    , regex = RegExp('[' + specials.join('\\') + ']', 'g')
    ;

  escapeRegExp = function (str) {
    return str.replace(regex, "\\$&");
  };

  // test escapeRegExp("/path/to/res?search=this.that")
}());

Can you use a trailing comma in a JSON object?

With Relaxed JSON, you can have trailing commas, or just leave the commas out. They are optional.

There is no reason at all commas need to be present to parse a JSON-like document.

Take a look at the Relaxed JSON spec and you will see how 'noisy' the original JSON spec is. Way too many commas and quotes...

http://www.relaxedjson.org

You can also try out your example using this online RJSON parser and see it get parsed correctly.

http://www.relaxedjson.org/docs/converter.html?source=%5B0%2C1%2C2%2C3%2C4%2C5%2C%5D

Forbidden You don't have permission to access /wp-login.php on this server

Make sure the following lines are not in your wp.config

define( 'FORCE_SSL_LOGIN', true );
define( 'FORCE_SSL_ADMIN', true );
define( 'DISALLOW_FILE_EDIT', true );

I got locked out after deactivating iThemes security plugin

Converting between datetime, Timestamp and datetime64

Some solutions work well for me but numpy will deprecate some parameters. The solution that work better for me is to read the date as a pandas datetime and excract explicitly the year, month and day of a pandas object. The following code works for the most common situation.

def format_dates(dates):
    dt = pd.to_datetime(dates)
    try: return [datetime.date(x.year, x.month, x.day) for x in dt]    
    except TypeError: return datetime.date(dt.year, dt.month, dt.day)

TSQL DATETIME ISO 8601

this is very old question, but since I came here while searching worth putting my answer.

SELECT DATEPART(ISO_WEEK,'2020-11-13') AS ISO_8601_WeekNr

How to get unique values in an array

You only need vanilla JS to find uniques with Array.some and Array.reduce. With ES2015 syntax it's only 62 characters.

a.reduce((c, v) => b.some(w => w === v) ? c : c.concat(v)), b)

Array.some and Array.reduce are supported in IE9+ and other browsers. Just change the fat arrow functions for regular functions to support in browsers that don't support ES2015 syntax.

var a = [1,2,3];
var b = [4,5,6];
// .reduce can return a subset or superset
var uniques = a.reduce(function(c, v){
    // .some stops on the first time the function returns true                
    return (b.some(function(w){ return w === v; }) ?  
      // if there's a match, return the array "c"
      c :     
      // if there's no match, then add to the end and return the entire array                                        
      c.concat(v)}),                                  
  // the second param in .reduce is the starting variable. This is will be "c" the first time it runs.
  b);

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/some https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce

Find duplicates and delete all in notepad++

You could use

Click TextFX ? Click TextFX Tools ? Click Sort lines case insensitive (at column) Duplicates and blank lines have been removed and the data has been sorted alphabetically.

as indicated above. However, the way I did it because I need to replace the duplicates by blank lines and not just remove the lines, once sorted alphabetically:

REPLACE:
((^.*$)(\n))(?=\k<1>)

by

$3

This will convert:

Shorts
Shorts
Shorts
Shorts
Shorts
Shorts Two Pack
Shorts Two Pack
Signature Braces
Signature Braces
Signature Cotton Trousers
Signature Cotton Trousers
Signature Cotton Trousers
Signature Cotton Trousers
Signature Cotton Trousers
Signature Cotton Trousers
Signature Cotton Trousers
Signature Cotton Trousers
Signature Cotton Trousers
Signature Cotton Trousers
Signature Cotton Trousers

to:

Shorts

Shorts Two Pack

Signature Braces










Signature Cotton Trousers

That's how I did it because I specifically needed those lines.

Copy Image from Remote Server Over HTTP

It's extremely simple using file_get_contents. Just provide the url as the first parameter.

Error Domain=NSURLErrorDomain Code=-1005 "The network connection was lost."

I was having this issue for the following reason.

TLDR: Check if you are sending a GET request that should be sending the parameters on the url instead of on the NSURLRequest's HTTBody property.

==================================================

I had mounted a network abstraction on my app, and it was working pretty well for all my requests.

I added a new request to another web service (not my own) and it started throwing me this error.

I went to a playground and started from the ground up building a barebones request, and it worked. So I started moving closer to my abstraction until I found the cause.

My abstraction implementation had a bug: I was sending a request that was supposed to send parameters encoded in the url and I was also filling the NSURLRequest's HTTBody property with the query parameters as well. As soon as I removed the HTTPBody it worked.

What's the best way to center your HTML email content in the browser window (or email client preview pane)?

To center the table in the middle of the email use

<table width="100%" align="center" border="0" cellspacing="0" cellpadding="0">
    <tr>
        <td>
            Your Content
        </td>
    </tr>
</table>

To align the content in the middle use:

<table width="100%" border="0" cellspacing="0" cellpadding="0">
    <tr>
        <td align="center">
            Your Content
        </td>
    </tr>
</table>

Iptables setting multiple multiports in one rule

enable_boxi_poorten

}

enable_boxi_poorten() {
SRV="boxi_poorten"
boxi_ports="427 5666 6001 6002 6003 6004 6005 6400 6410 8080 9321 15191 16447 17284 17723 17736 21306 25146 26632 27657 27683 28925 41583 45637 47648 49633 52551 53166 56392 56599 56911 59115 59898 60163 63512 6352 25834"


case "$1" in
  "LOCAL")
         for port in $boxi_ports; do $IPT -A tcp_inbound -p TCP -s $LOC_SUB --dport $port -j ACCEPT -m comment --comment "boxi specifieke poorten";done
     # multiports gaat maar tot 15 maximaal :((
     # daarom maar for loop maken
     # $IPT -A tcp_inbound -p TCP -s $LOC_SUB -m state --state NEW -m multiport --dports $MULTIPORTS -j ACCEPT -m comment --comment "boxi specifieke poorten"
     echo "${GREEN}Allowing $SRV for local hosts.....${NORMAL}"
    ;;
  "WEB")
     for port in $boxi_ports; do $IPT -A tcp_inbound -p TCP -s 0/0 --dport $port -j ACCEPT -m comment --comment "boxi specifieke poorten";done
     echo "${RED}Allowing $SRV for all hosts.....${NORMAL}"
    ;;
  *)
     for port in $boxi_ports; do $IPT -A tcp_inbound -p TCP -s $LOC_SUB --dport $port -j ACCEPT -m comment --comment "boxi specifieke poorten";done
     echo "${GREEN}Allowing $SRV for local hosts.....${NORMAL}"
    ;;
 esac

}

How do you convert a C++ string to an int?

Use the C++ streams.

std::string       plop("123");
std::stringstream str(plop);
int x;

str >> x;

/* Lets not forget to error checking */
if (!str)
{
     // The conversion failed.
     // Need to do something here.
     // Maybe throw an exception
}

PS. This basic principle is how the boost library lexical_cast<> works.

My favorite method is the boost lexical_cast<>

#include <boost/lexical_cast.hpp>

int x = boost::lexical_cast<int>("123");

It provides a method to convert between a string and number formats and back again. Underneath it uses a string stream so anything that can be marshaled into a stream and then un-marshaled from a stream (Take a look at the >> and << operators).

How to deep watch an array in angularjs?

_x000D_

$scope.changePass = function(data){_x000D_
    _x000D_
    if(data.txtNewConfirmPassword !== data.txtNewPassword){_x000D_
        $scope.confirmStatus = true;_x000D_
    }else{_x000D_
        $scope.confirmStatus = false;_x000D_
    }_x000D_
};

_x000D_

  <form class="list" name="myForm">_x000D_
      <label class="item item-input">        _x000D_
        <input type="password" placeholder="???????????????????" ng-model="data.txtCurrentPassword" maxlength="5" required>_x000D_
      </label>_x000D_
      <label class="item item-input">_x000D_
        <input type="password" placeholder="???????????????" ng-model="data.txtNewPassword" maxlength="5" ng-minlength="5" name="checknawPassword" ng-change="changePass(data)" required>_x000D_
      </label>_x000D_
      <label class="item item-input">_x000D_
        <input type="password" placeholder="????????????????????????" ng-model="data.txtNewConfirmPassword" maxlength="5" ng-minlength="5" name="checkConfirmPassword" ng-change="changePass(data)" required>_x000D_
      </label>      _x000D_
       <div class="spacer" style="width: 300px; height: 5px;"></div> _x000D_
      <span style="color:red" ng-show="myForm.checknawPassword.$error.minlength || myForm.checkConfirmPassword.$error.minlength">??????????????????? 5 ????</span><br>_x000D_
      <span ng-show="confirmStatus" style="color:red">?????????????????????</span>_x000D_
      <br>_x000D_
      <button class="button button-positive  button-block" ng-click="saveChangePass(data)" ng-disabled="myForm.$invalid || confirmStatus">???????</button>_x000D_
    </form>

_x000D_

How do I remove diacritics (accents) from a string in .NET?

This works fine in java.

It basically converts all accented characters into their deAccented counterparts followed by their combining diacritics. Now you can use a regex to strip off the diacritics.

import java.text.Normalizer;
import java.util.regex.Pattern;

public String deAccent(String str) {
    String nfdNormalizedString = Normalizer.normalize(str, Normalizer.Form.NFD); 
    Pattern pattern = Pattern.compile("\\p{InCombiningDiacriticalMarks}+");
    return pattern.matcher(nfdNormalizedString).replaceAll("");
}

What is tail call optimization?

We should ensure that there are no goto statements in the function itself .. taken care by function call being the last thing in the callee function.
Large scale recursions can use this for optimizations, but in small scale, the instruction overhead for making the function call a tail call reduces the actual purpose.
TCO might cause a forever running function:
```
void eternity()
{
    eternity();
}
```

How can I exclude all "permission denied" messages from "find"?

You can also use the -perm and -prune predicates to avoid descending into unreadable directories (see also How do I remove "permission denied" printout statements from the find program? - Unix & Linux Stack Exchange):

find . -type d ! -perm -g+r,u+r,o+r -prune -o -print > files_and_folders

How to find length of digits in an integer?

My code for the same is as follows;i have used the log10 method:

from math import *

def digit_count(number):

if number>1 and round(log10(number))>=log10(number) and number%10!=0 :
    return round(log10(number))
elif  number>1 and round(log10(number))<log10(number) and number%10!=0:
    return round(log10(number))+1
elif number%10==0 and number!=0:
    return int(log10(number)+1)
elif number==1 or number==0:
    return 1

I had to specify in case of 1 and 0 because log10(1)=0 and log10(0)=ND and hence the condition mentioned isn't satisfied. However, this code works only for whole numbers.

Loop through Map in Groovy?

When using the for loop, the value of s is a Map.Entry element, meaning that you can get the key from s.key and the value from s.value

How do I make a transparent border with CSS?

Yep, you can use border: 1px solid transparent

Another solution is to use outline on hover (and set the border to 0) which doesn't affect the document flow:

li{
    display:inline-block;
    padding:5px;
    border:0;
}
li:hover{
    outline:1px solid #FC0;
}

NB. You can only set the outline as a sharthand property, not for individual sides. It's only meant to be used for debugging but it works nicely.

How to establish ssh key pair when "Host key verification failed"

Also sometimes there is situation when you are working on serial console, then checking above command in verbose mode -v will show you /dev/tty does not exists, while it does.

In above case just remove /dev/tty and create a symlink of /dev/ttyS0 to /dev/tty.

"Uncaught SyntaxError: Cannot use import statement outside a module" when importing ECMAScript 6

I solved this issue by doing the following:

When using ECMAScript 6 modules from the browser, use the .js extension in your files and in the script tag add type = "module".

When using ECMAScript 6 modules from a Node.js environment, use the extension .mjs in your files and use this command to run the file:

node --experimental-modules filename.mjs

How do I use a regular expression to match any string, but at least 3 characters?

For .NET usage:

\p{L}{3,}

How do I loop through or enumerate a JavaScript object?

Considering ES6 I'd like to add my own spoon of sugar and provide one more approach to iterate over object's properties.

Since plain JS object isn't iterable just out of box, we aren't able to use for..of loop for iterating over its content. But no one can stop us to make it iterable.

Let's we have book object.

let book = {
  title: "Amazing book",
  author: "Me",
  pages: 3
}

book[Symbol.iterator] = function(){

  let properties = Object.keys(this); // returns an array with property names
  let counter = 0;
  let isDone = false;

  let next = () => {
    if(counter >= properties.length){
      isDone = true;
    }
    return { done: isDone, value: this[properties[counter++]] }
  }

  return { next };
}

Since we've made it we can use it this way:

for(let pValue of book){
  console.log(pValue);
}
------------------------
Amazing book
Me
3

Or if you know the power of ES6 generators, so you certainly can make the code above much shorter.

book[Symbol.iterator] = function *(){

  let properties = Object.keys(this);
  for (let p of properties){
    yield this[p];
  }

}

Sure, you can apply such behavior for all objects with making Object iterable on prototype level.

Object.prototype[Symbol.iterator] = function() {...}

Also, objects that comply with the iterable protocol can be used with the new ES2015 feature spread operator thus we can read object property values as an array.

let pValues = [...book];
console.log(pValues);
-------------------------
["Amazing book", "Me", 3]

Or you can use destructuring assignment:

let [title, , pages] = book; // notice that we can just skip unnecessary values
console.log(title);
console.log(pages);
------------------
Amazing book
3

You can check out JSFiddle with all code I've provided above.

Exposing the current state name with ui router

this is how I do it

JAVASCRIPT:

var module = angular.module('yourModuleName', ['ui.router']);

module.run( ['$rootScope', '$state', '$stateParams',
                      function ($rootScope,   $state,   $stateParams) {
    $rootScope.$state = $state;
    $rootScope.$stateParams = $stateParams; 
}
]);

HTML:

<pre id="uiRouterInfo">
      $state = {{$state.current.name}}
      $stateParams = {{$stateParams}}
      $state full url = {{ $state.$current.url.source }}    
</pre>

EXAMPLE

http://plnkr.co/edit/LGMZnj?p=preview

How does DateTime.Now.Ticks exactly work?

The resolution of DateTime.Now depends on your system timer (~10ms on a current Windows OS)...so it's giving the same ending value there (it doesn't count any more finite than that).

What is the difference between Serialization and Marshaling?

Both do one thing in common - that is serializing an Object. Serialization is used to transfer objects or to store them. But:

Serialization: When you serialize an object, only the member data within that object is written to the byte stream; not the code that actually implements the object.
Marshalling: Term Marshalling is used when we talk about passing Object to remote objects(RMI). In Marshalling Object is serialized(member data is serialized) + Codebase is attached.

So Serialization is part of Marshalling.

CodeBase is information that tells the receiver of Object where the implementation of this object can be found. Any program that thinks it might ever pass an object to another program that may not have seen it before must set the codebase, so that the receiver can know where to download the code from, if it doesn't have the code available locally. The receiver will, upon deserializing the object, fetch the codebase from it and load the code from that location.

Outline radius?

Old question now, but this might be relevant for somebody with a similar issue. I had an input field with rounded border and wanted to change colour of focus outline. I couldn't tame the horrid square outline to the input control.

So instead, I used box-shadow. I actually preferred the smooth look of the shadow, but the shadow can be hardened to simulate a rounded outline:

_x000D_

 /* Smooth outline with box-shadow: */_x000D_
    .text1:focus {_x000D_
        box-shadow: 0 0 3pt 2pt red;_x000D_
    }_x000D_
_x000D_
    /* Hard "outline" with box-shadow: */_x000D_
    .text2:focus {_x000D_
        box-shadow: 0 0 0 2pt red;_x000D_
    }

_x000D_

<input type=text class="text1"> _x000D_
<br>_x000D_
<br>_x000D_
<br>_x000D_
<br>_x000D_
<input type=text class="text2">

_x000D_

Difference between xcopy and robocopy

The most important difference is that robocopy will (usually) retry when an error occurs, while xcopy will not. In most cases, that makes robocopy far more suitable for use in a script.

Addendum: for completeness, there is one known edge case issue with robocopy; it may silently fail to copy files or directories whose names contain invalid UTF-16 sequences. If that's a problem for you, you may need to look at third-party tools, or write your own.

How to return data from promise

You have to return a promise instead of a variable. So in your function just return:

return relationsManagerResource.GetParentId(nodeId)

And later resolve the returned promise. Or you can make another deferred and resolve theParentId with it.

Boto3 to download all files from a S3 Bucket

for objs in my_bucket.objects.all():
    print(objs.key)
    path='/tmp/'+os.sep.join(objs.key.split(os.sep)[:-1])
    try:
        if not os.path.exists(path):
            os.makedirs(path)
        my_bucket.download_file(objs.key, '/tmp/'+objs.key)
    except FileExistsError as fe:                          
        print(objs.key+' exists')

This code will download the content in /tmp/ directory. If you want you can change the directory.

How to know/change current directory in Python shell?

>>> import os
>>> os.system('cd c:\mydir')

In fact, os.system() can execute any command that windows command prompt can execute, not just change dir.

strcpy() error in Visual studio 2012

Add this line top of the header

#pragma warning(disable : 4996)

Changing variable names with Python for loops

Use a list.

groups = [0]*3
for i in xrange(3):
    groups[i] = self.getGroup(selected, header + i)

or more "Pythonically":

groups = [self.getGroup(selected, header + i) for i in xrange(3)]

For what it's worth, you could try to create variables the "wrong" way, i.e. by modifying the dictionary which holds their values:

l = locals()
for i in xrange(3):
    l['group' + str(i)] = self.getGroup(selected, header + i)

but that's really bad form, and possibly not even guaranteed to work.

Synchronization vs Lock

There are 4 main factors into why you would want to use synchronized or java.util.concurrent.Lock.

Note: Synchronized locking is what I mean when I say intrinsic locking.

When Java 5 came out with ReentrantLocks, they proved to have quite a noticeble throughput difference then intrinsic locking. If youre looking for faster locking mechanism and are running 1.5 consider j.u.c.ReentrantLock. Java 6's intrinsic locking is now comparable.
j.u.c.Lock has different mechanisms for locking. Lock interruptable - attempt to lock until the locking thread is interrupted; timed lock - attempt to lock for a certain amount of time and give up if you do not succeed; tryLock - attempt to lock, if some other thread is holding the lock give up. This all is included aside from the simple lock. Intrinsic locking only offers simple locking
Style. If both 1 and 2 do not fall into categories of what you are concerned with most people, including myself, would find the intrinsic locking semenatics easier to read and less verbose then j.u.c.Lock locking.
Multiple Conditions. An object you lock on can only be notified and waited for a single case. Lock's newCondition method allows for a single Lock to have mutliple reasons to await or signal. I have yet to actually need this functionality in practice, but is a nice feature for those who need it.

How can I alias a default import in JavaScript?

defaultMember already is an alias - it doesn't need to be the name of the exported function/thing. Just do

import alias from 'my-module';

Alternatively you can do

import {default as alias} from 'my-module';

but that's rather esoteric.

Java : Accessing a class within a package, which is the better way?

They're equivalent. The access is the same.

The import is just a convention to save you from having to type the fully-resolved class name each time. You can write all your Java without using import, as long as you're a fast touch typer.

But there's no difference in efficiency or class loading.

django change default runserver port

I was struggling with the same problem and found one solution. I guess it can help you. when you run python manage.py runserver, it will take 127.0.0.1 as default ip address and 8000 as default port number which can be configured in your python environment. In your python setting, go to <your python env>\Lib\site-packages\django\core\management\commands\runserver.py and set 1. default_port = '<your_port>'
2. find this under def handle and set
if not options.get('addrport'): self.addr = '0.0.0.0' self.port = self.default_port

Now if you run "python manage.py runserver" it will run by default on "0.0.0.0:

Enjoy coding .....

Upload Progress Bar in PHP

I'm sorry to say that to the best of my knowledge a pure PHP upload progress bar, or even a PHP/Javascript upload progress bar is not possible because of how PHP works. Your best bet is to use some form of Flash uploader.

AFAIK This is because your script is not executed until all the superglobals are populated, which includes $_FILES. By the time your PHP script gets called, the file is fully uploaded.

EDIT: This is no longer true. It was in 2010.

Create list of object from another using Java 8 Streams

An addition to the solution by @Rafael Teles. The syntactic sugar Collectors.mapping does the same in one step:

//...
List<Employee> employees = persons.stream()
  .filter(p -> p.getLastName().equals("l1"))
  .collect(
    Collectors.mapping(
      p -> new Employee(p.getName(), p.getLastName(), 1000),
      Collectors.toList()));

Detailed example can be found here

selecting unique values from a column

There is a specific keyword for the achieving the same.

SELECT DISTINCT( Date ) AS Date 
FROM   buy 
ORDER  BY Date DESC;

Appending to an empty DataFrame in Pandas?

You can concat the data in this way:

InfoDF = pd.DataFrame()
tempDF = pd.DataFrame(rows,columns=['id','min_date'])

InfoDF = pd.concat([InfoDF,tempDF])

Padding between ActionBar's home icon and title

This is how I was able to set the padding between the home icon and the title.

ImageView view = (ImageView)findViewById(android.R.id.home);
view.setPadding(left, top, right, bottom);

I couldn't find a way to customize this via the ActionBar xml styles though. That is, the following XML doesn't work:

<style name="ActionBar" parent="android:style/Widget.Holo.Light.ActionBar">        
    <item name="android:titleTextStyle">@style/ActionBarTitle</item>
    <item name="android:icon">@drawable/ic_action_home</item>        
</style>

<style name="ActionBarTitle" parent="android:style/TextAppearance.Holo.Widget.ActionBar.Title">
    <item name="android:textSize">18sp</item>
    <item name="android:paddingLeft">12dp</item>   <!-- Can't get this padding to work :( -->
</style>

However, if you are looking to achieve this through xml, these two links might help you find a solution:

https://github.com/android/platform_frameworks_base/blob/master/core/res/res/values/styles.xml

(This is the actual layout used to display the home icon in an action bar) https://github.com/android/platform_frameworks_base/blob/master/core/res/res/layout/action_bar_home.xml

Get values from an object in JavaScript

If you want to do this in a single line, try:

Object.keys(a).map(function(key){return a[key]})

How to find a Java Memory Leak

NetBeans has a built-in profiler.

CSS text-align not working

You have to make the UL inside the div behave like a block. Try adding

.navigation ul {
     display: inline-block;
}

Handle ModelState Validation in ASP.NET Web API

Add below code in startup.cs file

services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2).ConfigureApiBehaviorOptions(options =>
            {
                options.InvalidModelStateResponseFactory = (context) =>
                {
                    var errors = context.ModelState.Values.SelectMany(x => x.Errors.Select(p => new ErrorModel()
                   {
                       ErrorCode = ((int)HttpStatusCode.BadRequest).ToString(CultureInfo.CurrentCulture),
                        ErrorMessage = p.ErrorMessage,
                        ServerErrorMessage = string.Empty
                    })).ToList();
                    var result = new BaseResponse
                    {
                        Error = errors,
                        ResponseCode = (int)HttpStatusCode.BadRequest,
                        ResponseMessage = ResponseMessageConstants.VALIDATIONFAIL,

                    };
                    return new BadRequestObjectResult(result);
                };
           });

Ignore Typescript Errors "property does not exist on value of type"

There are several ways to handle this problem. If this object is related to some external library, the best solution would be to find the actual definitions file (great repository here) for that library and reference it, e.g.:

/// <reference path="/path/to/jquery.d.ts" >

Of course, this doesn't apply in many cases.

If you want to 'override' the type system, try the following:

declare var y;

This will let you make any calls you want on var y.

How to compare strings in Bash

To compare strings with wildcards use

if [[ "$stringA" == *$stringB* ]]; then
  # Do something here
else
  # Do Something here
fi

How to remove duplicate values from a multi-dimensional array in PHP

I've given this problem a lot of thought and have determined that the optimal solution should follow two rules.

For scalability, modify the array in place; no copying to a new array
For performance, each comparison should be made only once

With that in mind and given all of PHP's quirks, below is the solution I came up with. Unlike some of the other answers, it has the ability to remove elements based on whatever key(s) you want. The input array is expected to be numeric keys.

$count_array = count($input);
for ($i = 0; $i < $count_array; $i++) {
    if (isset($input[$i])) {
        for ($j = $i+1; $j < $count_array; $j++) {
            if (isset($input[$j])) {
                //this is where you do your comparison for dupes
                if ($input[$i]['checksum'] == $input[$j]['checksum']) {
                    unset($input[$j]);
                }
            }
        }
    }
}

The only drawback is that the keys are not in order when the iteration completes. This isn't a problem if you're subsequently using only foreach loops, but if you need to use a for loop, you can put $input = array_values($input); after the above to renumber the keys.

How to reduce the image size without losing quality in PHP

I'd go for jpeg. Read this post regarding image size reduction and after deciding on the technique, use ImageMagick

Hope this helps

VS 2017 Metadata file '.dll could not be found

In my case, I had to open the .csproj file and add the reference by hand, like this (Microsoft.Extensions.Identity.Stores.dll was missing):

<Reference Include="Microsoft.Extensions.Identity.Stores">
  <HintPath>..\..\..\..\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.extensions.identity.stores\2.0.1\lib\netstandard2.0\Microsoft.Extensions.Identity.Stores.dll</HintPath>
</Reference>

AngularJS is rendering <br> as text not as a newline

Why so complicated?

I solved my problem this way simply:

  <pre>{{existingCategory+thisCategory}}</pre>

It will make <br /> automatically if the string contains '\n' that contain when I was saving data from textarea.

Removing duplicate values from a PowerShell array

This is how you get unique from an array with two or more properties. The sort is vital and the key to getting it to work correctly. Otherwise you just get one item returned.

PowerShell Script:

$objects = @(
    [PSCustomObject] @{ Message = "1"; MachineName = "1" }
    [PSCustomObject] @{ Message = "2"; MachineName = "1" }
    [PSCustomObject] @{ Message = "3"; MachineName = "1" }
    [PSCustomObject] @{ Message = "4"; MachineName = "1" }
    [PSCustomObject] @{ Message = "5"; MachineName = "1" }
    [PSCustomObject] @{ Message = "1"; MachineName = "2" }
    [PSCustomObject] @{ Message = "2"; MachineName = "2" }
    [PSCustomObject] @{ Message = "3"; MachineName = "2" }
    [PSCustomObject] @{ Message = "4"; MachineName = "2" }
    [PSCustomObject] @{ Message = "5"; MachineName = "2" }
    [PSCustomObject] @{ Message = "1"; MachineName = "1" }
    [PSCustomObject] @{ Message = "2"; MachineName = "1" }
    [PSCustomObject] @{ Message = "3"; MachineName = "1" }
    [PSCustomObject] @{ Message = "4"; MachineName = "1" }
    [PSCustomObject] @{ Message = "5"; MachineName = "1" }
    [PSCustomObject] @{ Message = "1"; MachineName = "2" }
    [PSCustomObject] @{ Message = "2"; MachineName = "2" }
    [PSCustomObject] @{ Message = "3"; MachineName = "2" }
    [PSCustomObject] @{ Message = "4"; MachineName = "2" }
    [PSCustomObject] @{ Message = "5"; MachineName = "2" }
)

Write-Host "Sorted on both properties with -Unique" -ForegroundColor Yellow
$objects | Sort-Object -Property Message,MachineName -Unique | Out-Host

Write-Host "Sorted on just Message with -Unique" -ForegroundColor Yellow
$objects | Sort-Object -Property Message -Unique | Out-Host

Write-Host "Sorted on just MachineName with -Unique" -ForegroundColor Yellow
$objects | Sort-Object -Property MachineName -Unique | Out-Host

Output:

Sorted on both properties with -Unique

Message MachineName
------- -----------
1       1          
1       2          
2       1          
2       2          
3       1          
3       2          
4       1          
4       2          
5       1          
5       2          


Sorted on just Message with -Unique

Message MachineName
------- -----------
1       1          
2       1          
3       1          
4       1          
5       2          


Sorted on just MachineName with -Unique

Message MachineName
------- -----------
1       1          
3       2

Source: https://powershell.org/forums/topic/need-to-unique-based-on-multiple-properties/

How do I get the value of a registry key and ONLY the value using powershell

$key = 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion'
(Get-ItemProperty -Path $key -Name ProgramFilesDir).ProgramFilesDir

I've never liked how this was provider was implemented like this : /

Basically, it makes every registry value a PSCustomObject object with PsPath, PsParentPath, PsChildname, PSDrive and PSProvider properties and then a property for its actual value. So even though you asked for the item by name, to get its value you have to use the name once more.

angular.element vs document.getElementById or jQuery selector with spin (busy) control

You should read the angular element docs if you haven't yet, so you can understand what is supported by jqLite and what not -jqlite is a subset of jquery built into angular.

Those selectors won't work with jqLite alone, since selectors by id are not supported.

  var target = angular.element('#appBusyIndicator');
  var target = angular.element('appBusyIndicator');

So, either :

you use jqLite alone, more limited than jquery, but enough in most of the situations.
or you include the full jQuery lib in your app, and use it like normal jquery, in the places that you really need jquery.

Edit: Note that jQuery should be loaded before angularJS in order to take precedence over jqLite:

Real jQuery always takes precedence over jqLite, provided it was loaded before DOMContentLoaded event fired.

Edit2: I missed the second part of the question before:

The issue with <input type="number"> , I think it is not an angular issue, it is the intended behaviour of the native html5 number element.

It won't return a non-numeric value even if you try to retrieve it with jquery's .val() or with the raw .value attribute.

docker error: /var/run/docker.sock: no such file or directory

You can quickly setup your environment using shellinit

At your command prompt execute:

$(boot2docker shellinit)

That will populate and export the environment variables and initialize other features.

Programs & Examples On #Facebook javascript sdk

How to add facebook share button on my website?

Facebook Javascript SDK Problem: "FB is not defined"

Chrome violation : [Violation] Handler took 83ms of runtime

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Facebook API error 191

What is the use of GO in SQL Server Management Studio & Transact SQL?

Best way to get whole number part of a Decimal number

Check last modified date of file in C#

changing color of h2

How to trim a list in Python

Is there a way to make AngularJS load partials in the beginning and not at when needed?

How to drop a database with Mongoose?

How to make layout with rounded corners..?

Run jar file with command line arguments

Is there a better way to run a command N times in bash?

Error while installing json gem 'mkmf.rb can't find header files for ruby'

Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist

ListAGG in SQLSERVER

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Checkout Jenkins Pipeline Git SCM with credentials?

Live Video Streaming with PHP

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CRON job to run on the last day of the month

How to install a specific version of package using Composer?

Java 256-bit AES Password-Based Encryption

How to link external javascript file onclick of button

How to remove html special chars?

Find character position and update file name

How can I set the max-width of a table cell using percentages?

How do I find Waldo with Mathematica?

How to convert binary string value to decimal

jQuery: get parent tr for selected radio button

How to scroll the page when a modal dialog is longer than the screen?

MySQL Like multiple values

How to detect DataGridView CheckBox event change?

What is the best way to update the entity in JPA

Python extract pattern matches

INSERT IF NOT EXISTS ELSE UPDATE?

using statement with multiple variables

How to cast or convert an unsigned int to int in C?

VBA Public Array : how to?

Equivalent of explode() to work with strings in MySQL

ACCESS_FINE_LOCATION AndroidManifest Permissions Not Being Granted

How do you read a CSV file and display the results in a grid in Visual Basic 2010?

org.apache.catalina.core.StandardContext startInternal SEVERE: Error listenerStart

Absolute positioning ignoring padding of parent

setup android on eclipse but don't know SDK directory

Viewing all defined variables

Why is the default value of the string type null instead of an empty string?

WPF global exception handler

How to call a mysql stored procedure, with arguments, from command line?

What are the differences between JSON and JSONP?

Recover unsaved SQL query scripts

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Nested iframes, AKA Iframe Inception

How to loop over a Class attributes in Java?

See also

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