Programs & Examples On #Reflow

Violation Long running JavaScript task took xx ms

These are just warnings as everyone mentioned. However, if you're keen on resolving these (which you should), then you need to identify what is causing the warning first. There's no one reason due to which you can get force reflow warning. Someone has created a list for some possible options. You can follow the discussion for more information.
Here's the gist of the possible reasons:

What forces layout / reflow

All of the below properties or methods, when requested/called in JavaScript, will trigger the browser to synchronously calculate the style and layout*. This is also called reflow or layout thrashing, and is common performance bottleneck.

Element

Box metrics
  • elem.offsetLeft, elem.offsetTop, elem.offsetWidth, elem.offsetHeight, elem.offsetParent
  • elem.clientLeft, elem.clientTop, elem.clientWidth, elem.clientHeight
  • elem.getClientRects(), elem.getBoundingClientRect()
Scroll stuff
  • elem.scrollBy(), elem.scrollTo()
  • elem.scrollIntoView(), elem.scrollIntoViewIfNeeded()
  • elem.scrollWidth, elem.scrollHeight
  • elem.scrollLeft, elem.scrollTop also, setting them
Focus
  • elem.focus() can trigger a double forced layout (source)
Also…
  • elem.computedRole, elem.computedName
  • elem.innerText (source)

getComputedStyle

window.getComputedStyle() will typically force style recalc (source)

window.getComputedStyle() will force layout, as well, if any of the following is true:

  1. The element is in a shadow tree
  2. There are media queries (viewport-related ones). Specifically, one of the following: (source) * min-width, min-height, max-width, max-height, width, height * aspect-ratio, min-aspect-ratio, max-aspect-ratio
    • device-pixel-ratio, resolution, orientation
  3. The property requested is one of the following: (source)
    • height, width * top, right, bottom, left * margin [-top, -right, -bottom, -left, or shorthand] only if the margin is fixed. * padding [-top, -right, -bottom, -left, or shorthand] only if the padding is fixed. * transform, transform-origin, perspective-origin * translate, rotate, scale * webkit-filter, backdrop-filter * motion-path, motion-offset, motion-rotation * x, y, rx, ry

window

  • window.scrollX, window.scrollY
  • window.innerHeight, window.innerWidth
  • window.getMatchedCSSRules() only forces style

Forms

  • inputElem.focus()
  • inputElem.select(), textareaElem.select() (source)

Mouse events

  • mouseEvt.layerX, mouseEvt.layerY, mouseEvt.offsetX, mouseEvt.offsetY (source)

document

  • doc.scrollingElement only forces style

Range

  • range.getClientRects(), range.getBoundingClientRect()

SVG

contenteditable

  • Lots & lots of stuff, …including copying an image to clipboard (source)

Check more here.

Also, here's Chromium source code from the original issue and a discussion about a performance API for the warnings.


Edit: There's also an article on how to minimize layout reflow on PageSpeed Insight by Google. It explains what browser reflow is:

Reflow is the name of the web browser process for re-calculating the positions and geometries of elements in the document, for the purpose of re-rendering part or all of the document. Because reflow is a user-blocking operation in the browser, it is useful for developers to understand how to improve reflow time and also to understand the effects of various document properties (DOM depth, CSS rule efficiency, different types of style changes) on reflow time. Sometimes reflowing a single element in the document may require reflowing its parent elements and also any elements which follow it.

In addition, it explains how to minimize it:

  1. Reduce unnecessary DOM depth. Changes at one level in the DOM tree can cause changes at every level of the tree - all the way up to the root, and all the way down into the children of the modified node. This leads to more time being spent performing reflow.
  2. Minimize CSS rules, and remove unused CSS rules.
  3. If you make complex rendering changes such as animations, do so out of the flow. Use position-absolute or position-fixed to accomplish this.
  4. Avoid unnecessary complex CSS selectors - descendant selectors in particular - which require more CPU power to do selector matching.

How to redirect on another page and pass parameter in url from table?

Here is a general solution that doesn't rely on JQuery. Simply modify the definition of window.location.

<html>
   <head>
      <script>
         function loadNewDoc(){ 
            var loc = window.location;
            window.location = loc.hostname + loc.port + loc.pathname + loc.search; 
         };
      </script>
   </head>
   <body onLoad="loadNewDoc()">
   </body>  
</html>

Resize height with Highcharts

You must set the height of the container explicitly

#container {
    height:100%;
    width:100%;
    position:absolute; 
}

See other Stackoverflow answer

Highcharts documentation

select the TOP N rows from a table

you can also check this link

SELECT * FROM master_question WHERE 1 ORDER BY question_id ASC LIMIT 20

for more detail click here

The following artifacts could not be resolved: javax.jms:jms:jar:1.1

In fact the real solution for this issue is to use the jms-api-1.1-rev-1.jar artifact available on Maven Central : http://search.maven.org/#artifactdetails%7Cjavax.jms%7Cjms-api%7C1.1-rev-1%7Cjar

Android and setting width and height programmatically in dp units

simplest way(and even works from api 1) that tested is:

getResources().getDimensionPixelSize(R.dimen.example_dimen);

From documentations:

Retrieve a dimensional for a particular resource ID for use as a size in raw pixels. This is the same as getDimension(int), except the returned value is converted to integer pixels for use as a size. A size conversion involves rounding the base value, and ensuring that a non-zero base value is at least one pixel in size.

Yes it rounding the value but it's not very bad(just in odd values on hdpi and ldpi devices need to add a little value when ldpi is not very common) I tested in a xxhdpi device that converts 4dp to 16(pixels) and that is true.

jQuery get the name of a select option

The Code is very Simple, Lets Put This Code

var name = $("#band_type_choices  option:selected").text();

Here You don't want to use $(this).find().text(), directly you can put your id name and add option:selected along with text().

This will return the result option name. Better Try this...

Variable declaration in a header file

What about this solution?

#ifndef VERSION_H
#define VERSION_H

static const char SVER[] = "14.2.1";
static const char AVER[] = "1.1.0.0";

#else

extern static const char SVER[];
extern static const char AVER[];

#endif /*VERSION_H */

The only draw back I see is that the include guard doesn't save you if you include it twice in the same file.

What are the differences between json and simplejson Python modules?

json seems faster than simplejson in both cases of loads and dumps in latest version

Tested versions:

  • python: 3.6.8
  • json: 2.0.9
  • simplejson: 3.16.0

Results:

>>> def test(obj, call, data, times):
...   s = datetime.now()
...   print("calling: ", call, " in ", obj, " ", times, " times") 
...   for _ in range(times):
...     r = getattr(obj, call)(data)
...   e = datetime.now()
...   print("total time: ", str(e-s))
...   return r

>>> test(json, "dumps", data, 10000)
calling:  dumps  in  <module 'json' from 'C:\\Users\\jophine.antony\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\json\\__init__.py'>   10000  times
total time:  0:00:00.054857

>>> test(simplejson, "dumps", data, 10000)
calling:  dumps  in  <module 'simplejson' from 'C:\\Users\\jophine.antony\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\simplejson\\__init__.py'>   10000  times
total time:  0:00:00.419895
'{"1": 100, "2": "acs", "3.5": 3.5567, "d": [1, "23"], "e": {"a": "A"}}'

>>> test(json, "loads", strdata, 1000)
calling:  loads  in  <module 'json' from 'C:\\Users\\jophine.antony\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\json\\__init__.py'>   1000  times
total time:  0:00:00.004985
{'1': 100, '2': 'acs', '3.5': 3.5567, 'd': [1, '23'], 'e': {'a': 'A'}}

>>> test(simplejson, "loads", strdata, 1000)
calling:  loads  in  <module 'simplejson' from 'C:\\Users\\jophine.antony\\AppData\\Local\\Programs\\Python\\Python36-32\\lib\\site-packages\\simplejson\\__init__.py'>   1000  times
total time:  0:00:00.040890
{'1': 100, '2': 'acs', '3.5': 3.5567, 'd': [1, '23'], 'e': {'a': 'A'}}

For versions:

  • python: 3.7.4
  • json: 2.0.9
  • simplejson: 3.17.0

json was faster than simplejson during dumps operation but both maintained the same speed during loads operations

Find out which remote branch a local branch is tracking

Having tried all of the solutions here, I realized none of them were good in all situations:

  • works on local branches
  • works on detached branches
  • works under CI

This command gets all names:

git branch -a --contains HEAD --list --format='%(refname:short)'

For my application, I had to filter out the HEAD & master refs, prefer remote refs, and strip off the word 'origin/'. and then if that wasn't found, use the first non HEAD ref that didn't have a / or a ( in it.

Load More Posts Ajax Button in WordPress

UPDATE 24.04.2016.

I've created tutorial on my page https://madebydenis.com/ajax-load-posts-on-wordpress/ about implementing this on Twenty Sixteen theme, so feel free to check it out :)

EDIT

I've tested this on Twenty Fifteen and it's working, so it should be working for you.

In index.php (assuming that you want to show the posts on the main page, but this should work even if you put it in a page template) I put:

    <div id="ajax-posts" class="row">
        <?php
            $postsPerPage = 3;
            $args = array(
                    'post_type' => 'post',
                    'posts_per_page' => $postsPerPage,
                    'cat' => 8
            );

            $loop = new WP_Query($args);

            while ($loop->have_posts()) : $loop->the_post();
        ?>

         <div class="small-12 large-4 columns">
                <h1><?php the_title(); ?></h1>
                <p><?php the_content(); ?></p>
         </div>

         <?php
                endwhile;
        wp_reset_postdata();
         ?>
    </div>
    <div id="more_posts">Load More</div>

This will output 3 posts from category 8 (I had posts in that category, so I used it, you can use whatever you want to). You can even query the category you're in with

$cat_id = get_query_var('cat');

This will give you the category id to use in your query. You could put this in your loader (load more div), and pull with jQuery like

<div id="more_posts" data-category="<?php echo $cat_id; ?>">>Load More</div>

And pull the category with

var cat = $('#more_posts').data('category');

But for now, you can leave this out.

Next in functions.php I added

wp_localize_script( 'twentyfifteen-script', 'ajax_posts', array(
    'ajaxurl' => admin_url( 'admin-ajax.php' ),
    'noposts' => __('No older posts found', 'twentyfifteen'),
));

Right after the existing wp_localize_script. This will load WordPress own admin-ajax.php so that we can use it when we call it in our ajax call.

At the end of the functions.php file I added the function that will load your posts:

function more_post_ajax(){

    $ppp = (isset($_POST["ppp"])) ? $_POST["ppp"] : 3;
    $page = (isset($_POST['pageNumber'])) ? $_POST['pageNumber'] : 0;

    header("Content-Type: text/html");

    $args = array(
        'suppress_filters' => true,
        'post_type' => 'post',
        'posts_per_page' => $ppp,
        'cat' => 8,
        'paged'    => $page,
    );

    $loop = new WP_Query($args);

    $out = '';

    if ($loop -> have_posts()) :  while ($loop -> have_posts()) : $loop -> the_post();
        $out .= '<div class="small-12 large-4 columns">
                <h1>'.get_the_title().'</h1>
                <p>'.get_the_content().'</p>
         </div>';

    endwhile;
    endif;
    wp_reset_postdata();
    die($out);
}

add_action('wp_ajax_nopriv_more_post_ajax', 'more_post_ajax');
add_action('wp_ajax_more_post_ajax', 'more_post_ajax');

Here I've added paged key in the array, so that the loop can keep track on what page you are when you load your posts.

If you've added your category in the loader, you'd add:

$cat = (isset($_POST['cat'])) ? $_POST['cat'] : '';

And instead of 8, you'd put $cat. This will be in the $_POST array, and you'll be able to use it in ajax.

Last part is the ajax itself. In functions.js I put inside the $(document).ready(); enviroment

var ppp = 3; // Post per page
var cat = 8;
var pageNumber = 1;


function load_posts(){
    pageNumber++;
    var str = '&cat=' + cat + '&pageNumber=' + pageNumber + '&ppp=' + ppp + '&action=more_post_ajax';
    $.ajax({
        type: "POST",
        dataType: "html",
        url: ajax_posts.ajaxurl,
        data: str,
        success: function(data){
            var $data = $(data);
            if($data.length){
                $("#ajax-posts").append($data);
                $("#more_posts").attr("disabled",false);
            } else{
                $("#more_posts").attr("disabled",true);
            }
        },
        error : function(jqXHR, textStatus, errorThrown) {
            $loader.html(jqXHR + " :: " + textStatus + " :: " + errorThrown);
        }

    });
    return false;
}

$("#more_posts").on("click",function(){ // When btn is pressed.
    $("#more_posts").attr("disabled",true); // Disable the button, temp.
    load_posts();
});

Saved it, tested it, and it works :)

Images as proof (don't mind the shoddy styling, it was done quickly). Also post content is gibberish xD

enter image description here

enter image description here

enter image description here

UPDATE

For 'infinite load' instead on click event on the button (just make it invisible, with visibility: hidden;) you can try with

$(window).on('scroll', function () {
    if ($(window).scrollTop() + $(window).height()  >= $(document).height() - 100) {
        load_posts();
    }
});

This should run the load_posts() function when you're 100px from the bottom of the page. In the case of the tutorial on my site you can add a check to see if the posts are loading (to prevent firing of the ajax twice), and you can fire it when the scroll reaches the top of the footer

$(window).on('scroll', function(){
    if($('body').scrollTop()+$(window).height() > $('footer').offset().top){
        if(!($loader.hasClass('post_loading_loader') || $loader.hasClass('post_no_more_posts'))){
                load_posts();
        }
    }
});

Now the only drawback in these cases is that you could never scroll to the value of $(document).height() - 100 or $('footer').offset().top for some reason. If that should happen, just increase the number where the scroll goes to.

You can easily check it by putting console.logs in your code and see in the inspector what they throw out

$(window).on('scroll', function () {
    console.log($(window).scrollTop() + $(window).height());
    console.log($(document).height() - 100);
    if ($(window).scrollTop() + $(window).height()  >= $(document).height() - 100) {
        load_posts();
    }
});

And just adjust accordingly ;)

Hope this helps :) If you have any questions just ask.

Get Maven artifact version at runtime

I spent some time on the two main approaches here and they didn't work-out for me. I am using Netbeans for the builds, may be there's more going on there. I had some errors and warnings from Maven 3 with some constructs, but I think those were easy to correct. No biggie.

I did find an answer that looks maintainable and simple to implement in this article on DZone:

I already have a resources/config sub-folder, and I named my file: app.properties, to better reflect the kind of stuff we may keep there (like a support URL, etc.).

The only caveat is that Netbeans gives a warning that the IDE needs filtering off. Not sure where/how. It has no effect at this point. Perhaps there's a work around for that if I need to cross that bridge. Best of luck.

How to get store information in Magento?

Just for information sake, in regards to my need... The answer I was looking for here was:

Mage::app()->getStore()->getGroup()->getName()

That is referenced on the admin page, where one can manage multiple stores... admin/system_store, I wanted to retrieve the store group title...

JavaScript naming conventions

I follow Douglas Crockford's code conventions for JavaScript. I also use his JSLint tool to validate following those conventions.

What is mod_php?

mod_php means PHP, as an Apache module.

Basically, when loading mod_php as an Apache module, it allows Apache to interpret PHP files (those are interpreted by mod_php).


EDIT : There are (at least) two ways of running PHP, when working with Apache :

  • Using CGI : a PHP process is launched by Apache, and it is that PHP process that interprets PHP code -- not Apache itself
  • Using PHP as an Apache module (called mod_php) : the PHP interpreter is then kind of "embedded" inside the Apache process : there is no external PHP process -- which means that Apache and PHP can communicate better.


And re-edit, after the comment : using CGI or mod_php is up to you : it's only a matter of configuration of your webserver.

To know which way is currently used on your server, you can check the output of phpinfo() : there should be something indicating whether PHP is running via mod_php (or mod_php5), or via CGI.

You might also want to take a look at the php_sapi_name() function : it returns the type of interface between web server and PHP.


If you check in your Apache's configuration files, when using mod_php, there should be a LoadModule line looking like this :

LoadModule php5_module        modules/libphp5.so

(The file name, on the right, can be different -- on Windows, for example, it should be a .dll)

How can I clear the terminal in Visual Studio Code?

To permanently delete the previous commands, use this

  1. Set-PSReadlineOption -HistoryNoDuplicates

  2. Remove-Item (Get-PSReadlineOption).HistorySavePath

  3. Alt-f7

Set up Python 3 build system with Sublime Text 3

If you are using PyQt, then for normal work, you should add "shell":"true" value, this looks like:

{
  "cmd": ["c:/Python32/python.exe", "-u", "$file"],
  "file_regex": "^[ ]*File \"(...*?)\", line ([0-9]*)",
  "selector": "source.python",
  "shell":"true"
}

The remote end hung up unexpectedly while git cloning

On MacOSX High Sierra the solution for me was:

brew install git-lfs

and my repository was cloned without any errors.

How to add a line break within echo in PHP?

The new line character is \n, like so:

echo __("Thanks for your email.\n<br />\n<br />Your order's details are below:", 'jigoshop');

Using Axios GET with Authorization Header in React-Native App

Could not get this to work until I put Authorization in single quotes:

axios.get(URL, { headers: { 'Authorization': AuthStr } })

ValueError: unsupported pickle protocol: 3, python2 pickle can not load the file dumped by python 3 pickle?

Pickle uses different protocols to convert your data to a binary stream.

You must specify in python 3 a protocol lower than 3 in order to be able to load the data in python 2. You can specify the protocol parameter when invoking pickle.dump.

SQL Connection Error: System.Data.SqlClient.SqlException (0x80131904)

See my post here

How are you? I had the same problem while i was trying connect to MSSQL Server remotely using jdbc (dbeaver on debian).

After a while, i found out that my firewall configuration was not correctly. So maybe it could help you!

Configure the firewall to allow network traffic that is related to SQL Server and to the SQL Server Browser service.

Four exceptions must be configured in Windows Firewall to allow access to SQL Server:

A port exception for TCP Port 1433. In the New Inbound Rule Wizard dialog, use the following information to create a port exception: Select Port Select TCP and specify port 1433 Allow the connection Choose all three profiles (Domain, Private & Public) Name the rule “SQL – TCP 1433" A port exception for UDP Port 1434. Click New Rule again and use the following information to create another port exception: Select Port Select UDP and specify port 1434 Allow the connection Choose all three profiles (Domain, Private & Public) Name the rule “SQL – UDP 1434 A program exception for sqlservr.exe. Click New Rule again and use the following information to create a program exception: Select Program Click Browse to select ‘sqlservr.exe’ at this location: [C:\Program Files\Microsoft SQL Server\MSSQL11.\MSSQL\Binn\sqlservr.exe] where is the name of your SQL instance. Allow the connection Choose all three profiles (Domain, Private & Public) Name the rule SQL – sqlservr.exe A program exception for sqlbrowser.exe Click New Rule again and use the following information to create another program exception: Select Program Click Browse to select sqlbrowser.exe at this location: [C:\Program Files\Microsoft SQL Server\90\Shared\sqlbrowser.exe]. Allow the connection Choose all three profiles (Domain, Private & Public) Name the rule SQL - sqlbrowser.exe

Source: http://blog.citrix24.com/configure-sql-express-to-accept-remote-connections/

What does the 'Z' mean in Unix timestamp '120314170138Z'?

The Z stands for 'Zulu' - your times are in UTC. From Wikipedia:

The UTC time zone is sometimes denoted by the letter Z—a reference to the equivalent nautical time zone (GMT), which has been denoted by a Z since about 1950. The letter also refers to the "zone description" of zero hours, which has been used since 1920 (see time zone history). Since the NATO phonetic alphabet and amateur radio word for Z is "Zulu", UTC is sometimes known as Zulu time. This is especially true in aviation, where Zulu is the universal standard.

how to rename an index in a cluster?

As such there is no direct method to copy or rename index in ES (I did search extensively for my own project)

However a very easy option is to use a popular migration tool [Elastic-Exporter].

http://www.retailmenot.com/corp/eng/posts/2014/12/02/elasticsearch-cluster-migration/

[PS: this is not my blog, just stumbled upon and found it good]

Thereby you can copy index/type and then delete the old one.

Python Requests - No connection adapters

One more reason, maybe your url include some hiden characters, such as '\n'.

If you define your url like below, this exception will raise:

url = '''
http://google.com
'''

because there are '\n' hide in the string. The url in fact become:

\nhttp://google.com\n

Read environment variables in Node.js

If you want to use a string key generated in your Node.js program, say, var v = 'HOME', you can use process.env[v].

Otherwise, process.env.VARNAME has to be hardcoded in your program.

Material Design not styling alert dialogs

UPDATED ON Aug 2019 WITH The Material components for android library:

With the new Material components for Android library you can use the new com.google.android.material.dialog.MaterialAlertDialogBuilder class, which extends from the existing androidx.appcompat.AlertDialog.Builder class and provides support for the latest Material Design specifications.

Just use something like this:

new MaterialAlertDialogBuilder(context)
            .setTitle("Dialog")
            .setMessage("Lorem ipsum dolor ....")
            .setPositiveButton("Ok", /* listener = */ null)
            .setNegativeButton("Cancel", /* listener = */ null)
            .show();

You can customize the colors extending the ThemeOverlay.MaterialComponents.MaterialAlertDialog style:

  <style name="CustomMaterialDialog" parent="@style/ThemeOverlay.MaterialComponents.MaterialAlertDialog">
     <!-- Background Color-->
     <item name="android:background">#006db3</item>
     <!-- Text Color for title and message -->
     <item name="colorOnSurface">@color/secondaryColor</item>
     <!-- Text Color for buttons -->
     <item name="colorPrimary">@color/white</item> 
     ....
  </style>  

To apply your custom style just use the constructor:

new MaterialAlertDialogBuilder(context, R.style.CustomMaterialDialog)

enter image description here

To customize the buttons, the title and the body text check this post for more details.

You can also change globally the style in your app theme:

 <!-- Base application theme. -->
 <style name="AppTheme" parent="Theme.MaterialComponents.Light">
    ...
    <item name="materialAlertDialogTheme">@style/CustomMaterialDialog</item>
 </style>

WITH SUPPORT LIBRARY and APPCOMPAT THEME:

With the new AppCompat v22.1 you can use the new android.support.v7.app.AlertDialog.

Just use a code like this:

import android.support.v7.app.AlertDialog

AlertDialog.Builder builder =
       new AlertDialog.Builder(this, R.style.AppCompatAlertDialogStyle);
builder.setTitle("Dialog");
builder.setMessage("Lorem ipsum dolor ....");
builder.setPositiveButton("OK", null);
builder.setNegativeButton("Cancel", null);
builder.show();

And use a style like this:

<style name="AppCompatAlertDialogStyle" parent="Theme.AppCompat.Light.Dialog.Alert">
        <item name="colorAccent">#FFCC00</item>
        <item name="android:textColorPrimary">#FFFFFF</item>
        <item name="android:background">#5fa3d0</item>
    </style>

Otherwise you can define in your current theme:

<style name="AppTheme" parent="Theme.AppCompat.Light">
    <!-- your style -->
    <item name="alertDialogTheme">@style/AppCompatAlertDialogStyle</item>
</style>

and then in your code:

 import android.support.v7.app.AlertDialog

    AlertDialog.Builder builder =
           new AlertDialog.Builder(this);

Here the AlertDialog on Kitkat: enter image description here

How do I put variable values into a text string in MATLAB?

Here's how you convert numbers to strings, and join strings to other things (it's weird):

>> ['the number is ' num2str(15) '.']
ans =
the number is 15.

How can I save a screenshot directly to a file in Windows?

Dropbox now provides the hook to do this automagically. If you get a free dropbox account and install the laptop app, when you press PrtScr Dropbox will give you the option of automatically storing all screenshots to your dropbox folder.

HTML SELECT - Change selected option by VALUE using JavaScript

You can select the value using javascript:

document.getElementById('sel').value = 'bike';

DEMO

grep from tar.gz without extracting [faster one]

If you have zgrep you can use

zgrep -a string file.tar.gz

Circular dependency in Spring

As the other answers have said, Spring just takes care of it, creating the beans and injecting them as required.

One of the consequences is that bean injection / property setting might occur in a different order to what your XML wiring files would seem to imply. So you need to be careful that your property setters don't do initialization that relies on other setters already having been called. The way to deal with this is to declare beans as implementing the InitializingBean interface. This requires you to implement the afterPropertiesSet() method, and this is where you do the critical initialization. (I also include code to check that important properties have actually been set.)

Determining 32 vs 64 bit in C++

"Compiled in 64 bit" is not well defined in C++.

C++ sets only lower limits for sizes such as int, long and void *. There is no guarantee that int is 64 bit even when compiled for a 64 bit platform. The model allows for e.g. 23 bit ints and sizeof(int *) != sizeof(char *)

There are different programming models for 64 bit platforms.

Your best bet is a platform specific test. Your second best, portable decision must be more specific in what is 64 bit.

Android camera android.hardware.Camera deprecated

Answers provided here as which camera api to use are wrong. Or better to say they are insufficient.

Some phones (for example Samsung Galaxy S6) could be above api level 21 but still may not support Camera2 api.

CameraCharacteristics mCameraCharacteristics = mCameraManager.getCameraCharacteristics(mCameraId);
Integer level = mCameraCharacteristics.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL);
if (level == null || level == CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY) {
    return false;
}

CameraManager class in Camera2Api has a method to read camera characteristics. You should check if hardware wise device is supporting Camera2 Api or not.

But there are more issues to handle if you really want to make it work for a serious application: Like, auto-flash option may not work for some devices or battery level of the phone might create a RuntimeException on Camera or phone could return an invalid camera id and etc.

So best approach is to have a fallback mechanism as for some reason Camera2 fails to start you can try Camera1 and if this fails as well you can make a call to Android to open default Camera for you.

Delimiter must not be alphanumeric or backslash and preg_match

Maybe not related to original code example, but I received the error "Delimiter must not be alphanumeric or backslash" and Googled here. Reason: I mixed order of parameters for preg_match. Pattern was the second parameter and string to match was first. Be careful :)

Error message "Unable to install or run the application. The application requires stdole Version 7.0.3300.0 in the GAC"

So it turns out that the .NET files were copied to C:\Program Files\Microsoft.NET\Primary Interop Assemblies\. However, they were never registered in the GAC.

I ended up manually dragging the files in C:\Program Files\Microsoft.NET\Primary Interop Assemblies to C:\windows\assembly and the application worked on that problem machine. You could also do this programmatically with Gacutil.

So it seems that something happened to .NET during the install, but this seems to correct the problem. I hope that helps someone else out!

How do I call a SQL Server stored procedure from PowerShell?

This answer was pulled from http://www.databasejournal.com/features/mssql/article.php/3683181

This same example can be used for any adhoc queries. Let us execute the stored procedure “sp_helpdb” as shown below.

$SqlConnection = New-Object System.Data.SqlClient.SqlConnection
$SqlConnection.ConnectionString = "Server=HOME\SQLEXPRESS;Database=master;Integrated Security=True"
$SqlCmd = New-Object System.Data.SqlClient.SqlCommand
$SqlCmd.CommandText = "sp_helpdb"
$SqlCmd.Connection = $SqlConnection
$SqlAdapter = New-Object System.Data.SqlClient.SqlDataAdapter
$SqlAdapter.SelectCommand = $SqlCmd
$DataSet = New-Object System.Data.DataSet
$SqlAdapter.Fill($DataSet)
$SqlConnection.Close()
$DataSet.Tables[0]

CodeIgniter removing index.php from url

first of all you have to on the apache server rewrite engine on.this link will help you for that

http://www.anmsaiful.net/blog/php/enable-apache-rewrite-module.html

RewriteEngine On
RewriteBase /your_folder_name/

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule ^(.*)$ index.php?/$1 [L]

this will be your .htaccess file. now try it .this setting works for me.

EditText, inputType values (xml)

android:inputMethod

is deprecated, instead use inputType :

 android:inputType="numberPassword"

std::unique_lock<std::mutex> or std::lock_guard<std::mutex>?

There are certain common things between lock_guard and unique_lock and certain differences.

But in the context of the question asked, the compiler does not allow using a lock_guard in combination with a condition variable, because when a thread calls wait on a condition variable, the mutex gets unlocked automatically and when other thread/threads notify and the current thread is invoked (comes out of wait), the lock is re-acquired.

This phenomenon is against the principle of lock_guard. lock_guard can be constructed only once and destructed only once.

Hence lock_guard cannot be used in combination with a condition variable, but a unique_lock can be (because unique_lock can be locked and unlocked several times).

UnicodeDecodeError: 'utf8' codec can't decode byte 0xa5 in position 0: invalid start byte

In my case, i had to save the file as UTF8 with BOM not just as UTF8 utf8 then this error was gone.

Radio button validation in javascript

<form action="" method="post" name="register_form" id="register_form" enctype="multipart/form-data">

    <div class="text-input">
        <label>Gender: </label>
        <input class="form-control" type="radio" name="gender" id="male" value="male" />
        <label for="male">Male</label>
        <input class="form-control" type="radio" name="gender" id="female" value="female" />
        <label for="female">Female</label>
    </div>
    <div class="text-input" align="center">
        <input type="submit" name="register" value="Submit" onclick="return radioValidation();" />
    </div>

</form>

<script type="text/javascript">
    function radioValidation(){

        var gender = document.getElementsByName('gender');
        var genValue = false;

        for(var i=0; i<gender.length;i++){
            if(gender[i].checked == true){
                genValue = true;    
            }
        }
        if(!genValue){
            alert("Please Choose the gender");
            return false;
        }

    }
</script>

Source: http://chandreshrana.blogspot.in/2016/11/radio-button-validation-in-javascript.html

How to find a text inside SQL Server procedures / triggers?

SELECT ROUTINE_TYPE, ROUTINE_NAME, ROUTINE_DEFINITION
FROM INFORMATION_SCHEMA.ROUTINES 
WHERE ROUTINE_DEFINITION LIKE '%Your Text%' 

How to set Java SDK path in AndroidStudio?

1) File >>> Project Structure OR press Ctrl+Alt+Shift+S

2) In SDK Location Tab you will find SDK Location:

enter image description here

3) Change your Project SDK location to the one you have installed

4) Sync your project

Using an array from Observable Object with ngFor and Async Pipe Angular 2

I think what u r looking for is this

<article *ngFor="let news of (news$ | async)?.articles">
<h4 class="head">{{news.title}}</h4>
<div class="desc"> {{news.description}}</div>
<footer>
    {{news.author}}
</footer>

Cache an HTTP 'Get' service response in AngularJS?

Angular's $http has a cache built in. According to the docs:

cache – {boolean|Object} – A boolean value or object created with $cacheFactory to enable or disable caching of the HTTP response. See $http Caching for more information.

Boolean value

So you can set cache to true in its options:

$http.get(url, { cache: true}).success(...);

or, if you prefer the config type of call:

$http({ cache: true, url: url, method: 'GET'}).success(...);

Cache Object

You can also use a cache factory:

var cache = $cacheFactory('myCache');

$http.get(url, { cache: cache })

You can implement it yourself using $cacheFactory (especially handly when using $resource):

var cache = $cacheFactory('myCache');

var data = cache.get(someKey);

if (!data) {
   $http.get(url).success(function(result) {
      data = result;
      cache.put(someKey, data);
   });
}

Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.support:appcompat-v7:26.1.0

Today I have the similar problem.

Previous in my project gradle

// Top-level build file where you can add configuration options common to all 
sub-projects/modules.
allprojects {
repositories {
    jcenter()
    google()
    mavenCentral()
    maven { url "https://jitpack.io" }
    maven { url 'https://plugins.gradle.org/m2/'}
}}

Then I just added this below line in allprojects

maven {
        url "https://maven.google.com"
    }

It saved my day.

And now my current allproject {} code looks like this

allprojects {
repositories {
    jcenter()
    google()
    mavenCentral()
    maven { url "https://jitpack.io" }
    maven { url 'https://plugins.gradle.org/m2/'}
    maven {
        url "https://maven.google.com"
    }
}}

How to select only date from a DATETIME field in MySQL?

Try SELECT * FROM Profiles WHERE date(DateReg)=$date where $date is in yyyy-mm-dd

Alternatively SELECT * FROM Profiles WHERE left(DateReg,10)=$date

Cheers

increase font size of hyperlink text html

you can add class in anchor tag also like below

.a_class {font-size: 100px} 

SameSite warning Chrome 77

This console warning is not an error or an actual problem — Chrome is just spreading the word about this new standard to increase developer adoption.

It has nothing to do with your code. It is something their web servers will have to support.

Release date for a fix is February 4, 2020 per: https://www.chromium.org/updates/same-site

February, 2020: Enforcement rollout for Chrome 80 Stable: The SameSite-by-default and SameSite=None-requires-Secure behaviors will begin rolling out to Chrome 80 Stable for an initial limited population starting the week of February 17, 2020, excluding the US President’s Day holiday on Monday. We will be closely monitoring and evaluating ecosystem impact from this initial limited phase through gradually increasing rollouts.

For the full Chrome release schedule, see here.

I solved same problem by adding in response header

response.setHeader("Set-Cookie", "HttpOnly;Secure;SameSite=Strict");

SameSite prevents the browser from sending the cookie along with cross-site requests. The main goal is mitigating the risk of cross-origin information leakage. It also provides some protection against cross-site request forgery attacks. Possible values for the flag are Lax or Strict.

SameSite cookies explained here

Please refer this before applying any option.

Hope this helps you.

Save the console.log in Chrome to a file

the other solutions in this thread weren't working on my mac. Here's a logger that saves a string representation intermittently using ajax. use it with console.save instead of console.log

var logFileString="";
var maxLogLength=1024*128;

console.save=function(){
  var logArgs={};

  for(var i=0; i<arguments.length; i++) logArgs['arg'+i]=arguments[i];
  console.log(logArgs);

  // keep a string representation of every log
  logFileString+=JSON.stringify(logArgs,null,2)+'\n';

  // save the string representation when it gets big
  if(logFileString.length>maxLogLength){
    // send a copy in case race conditions change it mid-save
    saveLog(logFileString);
    logFileString="";
  }
};

depending on what you need, you can save that string or just console.log it and copy and paste. here's an ajax for you in case you want to save it:

function saveLog(data){
  // do some ajax stuff with data.
  var xhttp = new XMLHttpRequest();

  xhttp.onreadystatechange = function(){
    if (this.readyState == 4 && this.status == 200) {}
  }

  xhttp.open("POST", 'saveLog.php', true);
  xhttp.send(data);
}

the saveLog.php should append the data to a log file somewhere. I didn't need that part so I'm not including it here. :)

https://www.google.com/search?q=php+append+to+log

Spring security CORS Filter

With Spring Security in Spring Boot 2 to configure CORS globally (e.g. enabled all request for development) you can do:

@Bean
protected CorsConfigurationSource corsConfigurationSource() {
    UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
    source.registerCorsConfiguration("/**", new CorsConfiguration().applyPermitDefaultValues());
    return source;
}

@Override
protected void configure(HttpSecurity http) throws Exception {
    http.cors()
            .and().authorizeRequests()
            .anyRequest().permitAll()
            .and().csrf().disable();
}

Joining Multiple Tables - Oracle

I recommend that you get in the habit, right now, of using ANSI-style joins, meaning you should use the INNER JOIN, LEFT OUTER JOIN, RIGHT OUTER JOIN, FULL OUTER JOIN, and CROSS JOIN elements in your SQL statements rather than using the "old-style" joins where all the tables are named together in the FROM clause and all the join conditions are put in the the WHERE clause. ANSI-style joins are easier to understand and less likely to be miswritten and/or misinterpreted than "old-style" joins.

I'd rewrite your query as:

SELECT bc.firstname,
       bc.lastname,
       b.title,
       TO_CHAR(bo.orderdate, 'MM/DD/YYYY') "Order Date",
       p.publishername
FROM BOOK_CUSTOMER bc
INNER JOIN books b
  ON b.BOOK_ID = bc.BOOK_ID
INNER JOIN  book_order bo
  ON bo.BOOK_ID = b.BOOK_ID
INNER JOIN publisher p
  ON p.PUBLISHER_ID = b.PUBLISHER_ID
WHERE p.publishername = 'PRINTING IS US';

Share and enjoy.

Xcode 4: How do you view the console?

Here's an alternative.

  1. In XCode4 double-click your Project (Blueprint Icon).
  2. Select the Target (Gray Icon)
  3. Select the Build Phases (Top Center)
  4. Add Build Phase "Run Script" (Green Plus Button, bottom right)
  5. In the textbox below the Shell textfield replace "Type a script or drag a script file from your workspace" with "open ${TARGET_BUILD_DIR}/${TARGET_NAME}"

This will open a terminal window with your command-line app running in it.

This is not a great solution because XCode 4 still runs and debugs the app independently of what you're doing in the terminal window that pops up.

How to stick <footer> element at the bottom of the page (HTML5 and CSS3)?

I would use this in HTML 5... Just sayin

#footer {
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 60px;
  background-color: #f5f5f5;
}

How do I create a file AND any folders, if the folders don't exist?

. given a path, how can we recursively create all the folders necessary to create the file .. for that path

Creates all directories and subdirectories as specified by path.

Directory.CreateDirectory(path);

then you may create a file.

Set mouse focus and move cursor to end of input using jQuery

At the first you have to set focus on selected textbox object and next you set the value.

$('#inputID').focus();
$('#inputID').val('someValue')

How to automatically start a service when running a docker container?

In my case, I have a PHP web application being served by Apache2 within the docker container that connects to a MYSQL backend database. Larry Cai's solution worked with minor modifications. I created a entrypoint.sh file within which I am managing my services. I think creating an entrypoint.sh when you have more than one command to execute when your container starts up is a cleaner way to bootstrap docker.

#!/bin/sh

set -e

echo "Starting the mysql daemon"
service mysql start

echo "navigating to volume /var/www"
cd /var/www
echo "Creating soft link"
ln -s /opt/mysite mysite

a2enmod headers
service apache2 restart

a2ensite mysite.conf
a2dissite 000-default.conf
service apache2 reload

if [ -z "$1" ]
then
    exec "/usr/sbin/apache2 -D -foreground"
else
    exec "$1"
fi

How to run bootRun with spring profile via gradle task

I wanted it simple just to be able to call gradle bootRunDev like you without having to do any extra typing..

This worked for me - by first configuring it the bootRun in my task and then right after it running bootRun which worked fine for me :)

task bootRunDev {
    bootRun.configure {
        systemProperty "spring.profiles.active", 'Dev'
    }
}

bootRunDev.finalizedBy bootRun

CSS3 background image transition

Salam, this answer works only in Chrome, cause IE and FF support color transition.

There is no need to make your HTML elements opacity:0, cause some times they contain text, and no need to double your elements!.

The question with link to an example in jsfiddle needed a small change, that is to put an empty image in .title a like background:url(link to an empty image); same as you put it in .title a:hover but make it empty image, and the code will work.

.title a {
display: block;
width: 340px;
height: 338px;
color: black;
background: url(https://upload.wikimedia.org/wikipedia/commons/5/59/Empty.png) repeat;
/* TRANSISITION */
transition: background 1s;
-webkit-transition: background 1s;
-moz-transition: background 1s;
-o-transition: background 1s;
  }
  .title a:hover{   background: transparent;
   background: url(https://lh3.googleusercontent.com/-p1nr1fkWKUo/T0zUp5CLO3I/AAAAAAAAAWg/jDiQ0cUBuKA/s800/red-pattern.png) repeat;
/* TRANSISITION */
transition: background 1s;
-webkit-transition: background 1s;
-moz-transition: background 1s;
-o-transition: background 1s;
}

Check this out https://jsfiddle.net/Tobasi/vv8q9hum/

Redirect all output to file in Bash

To get the output on the console AND in a file file.txt for example.

make 2>&1 | tee file.txt

Note: & (in 2>&1) specifies that 1 is not a file name but a file descriptor.

const vs constexpr on variables

A constexpr symbolic constant must be given a value that is known at compile time. For example:

?constexpr int max = 100; 
void use(int n)
{
    constexpr int c1 = max+7; // OK: c1 is 107
    constexpr int c2 = n+7;   // Error: we don’t know the value of c2
    // ...
}

To handle cases where the value of a “variable” that is initialized with a value that is not known at compile time but never changes after initialization, C++ offers a second form of constant (a const). For Example:

?constexpr int max = 100; 
void use(int n)
{
    constexpr int c1 = max+7; // OK: c1 is 107
    const int c2 = n+7; // OK, but don’t try to change the value of c2
    // ...
    c2 = 7; // error: c2 is a const
}

Such “const variables” are very common for two reasons:

  1. C++98 did not have constexpr, so people used const.
  2. List item “Variables” that are not constant expressions (their value is not known at compile time) but do not change values after initialization are in themselves widely useful.

Reference : "Programming: Principles and Practice Using C++" by Stroustrup

How to use PrimeFaces p:fileUpload? Listener method is never invoked or UploadedFile is null / throws an error / not usable

With JBoss 7.2(Undertow) and PrimeFaces 6.0 org.primefaces.webapp.filter.FileUploadFilter should be removed from web.xml and context param file uploader should be set to native:

<context-param>
    <param-name>primefaces.UPLOADER</param-name>
    <param-value>native</param-value>
</context-param>

Moment.js - two dates difference in number of days

From the moment.js docs: format('E') stands for day of week. thus your diff is being computed on which day of the week, which has to be between 1 and 7.

From the moment.js docs again, here is what they suggest:

var a = moment([2007, 0, 29]);
var b = moment([2007, 0, 28]);
a.diff(b, 'days') // 1

Here is a JSFiddle for your particular case:

_x000D_
_x000D_
$('#test').click(function() {_x000D_
  var startDate = moment("13.04.2016", "DD.MM.YYYY");_x000D_
  var endDate = moment("28.04.2016", "DD.MM.YYYY");_x000D_
_x000D_
  var result = 'Diff: ' + endDate.diff(startDate, 'days');_x000D_
_x000D_
  $('#result').html(result);_x000D_
});
_x000D_
#test {_x000D_
  width: 100px;_x000D_
  height: 100px;_x000D_
  background: #ffb;_x000D_
  padding: 10px;_x000D_
  border: 2px solid #999;_x000D_
}
_x000D_
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.12.0/moment.js"></script>_x000D_
_x000D_
<div id='test'>Click Me!!!</div>_x000D_
<div id='result'></div>
_x000D_
_x000D_
_x000D_

C++ delete vector, objects, free memory

You can call clear, and that will destroy all the objects, but that will not free the memory. Looping through the individual elements will not help either (what action would you even propose to take on the objects?) What you can do is this:

vector<tempObject>().swap(tempVector);

That will create an empty vector with no memory allocated and swap it with tempVector, effectively deallocating the memory.

C++11 also has the function shrink_to_fit, which you could call after the call to clear(), and it would theoretically shrink the capacity to fit the size (which is now 0). This is however, a non-binding request, and your implementation is free to ignore it.

Use of REPLACE in SQL Query for newline/ carriage return characters

There are probably embedded tabs (CHAR(9)) etc. as well. You can find out what other characters you need to replace (we have no idea what your goal is) with something like this:

DECLARE @var NVARCHAR(255), @i INT;

SET @i = 1;

SELECT @var = AccountType FROM dbo.Account
  WHERE AccountNumber = 200
  AND AccountType LIKE '%Daily%';

CREATE TABLE #x(i INT PRIMARY KEY, c NCHAR(1), a NCHAR(1));

WHILE @i <= LEN(@var)
BEGIN
  INSERT #x 
    SELECT SUBSTRING(@var, @i, 1), ASCII(SUBSTRING(@var, @i, 1));

  SET @i = @i + 1;
END

SELECT i,c,a FROM #x ORDER BY i;

You might also consider doing better cleansing of this data before it gets into your database. Cleaning it every time you need to search or display is not the best approach.

How to "git show" a merge commit with combined diff output even when every changed file agrees with one of the parents?

If you are sitting at the merge commit then this shows the diffs:

git diff HEAD~1..HEAD

If you're not at the merge commit then just replace HEAD with the merge commit. This method seems like the simplest and most intuitive.

How to add action listener that listens to multiple buttons

First, exend JFrame properly with a super() and a constructor then add actionlisteners to the frame and add the buttons.

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;


public class Calc extends JFrame implements ActionListener {
    JButton button1 = new JButton("1");
    JButton button2 = new JButton("2");

    public Calc()
    {
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         setSize(100, 100);
         button1.addActionListener(this);
         button2.addActionListener(this);
         calcFrame.add(button1);
         calcFrame.add(button2);
    }
    public void actionPerformed(ActionEvent e)
    {
        Object source = e.getSource();
        if(source == button1)
        {
            \\button1 code here
        } else if(source == button2)
        {
            \\button2 code here
        }
    } 
    public static void main(String[] args)
    {

        JFrame calcFrame = new JFrame();
        calcFrame.setVisible(true);
    }
}

How to iterate over associative arrays in Bash

Use this higher order function to prevent the pyramid of doom

foreach(){ 
  arr="$(declare -p $1)" ; eval "declare -A f="${arr#*=}; 
  for i in ${!f[@]}; do $2 "$i" "${f[$i]}"; done
}

example:

$ bar(){ echo "$1 -> $2"; }
$ declare -A foo["flap"]="three four" foo["flop"]="one two"
$ foreach foo bar
flap -> three four
flop -> one two

Using Javascript: How to create a 'Go Back' link that takes the user to a link if there's no history for the tab or window?

check window.history.length or simply, history.length

EDIT: some browsers start their history with 0, others with 1. adjust accordingly.

if it has a value of 1, it means it's the first page in that window/tab - then you can have JS redirect you.

<script>
    function backAway(){
        //if it was the first page
        if(history.length === 1){
            window.location = "http://www.mysite.com/"
        } else {
            history.back();
        }
    }
</script>

<a href="#" onClick="backAway()">Back</a>

How to use tick / checkmark symbol (?) instead of bullets in unordered list?

Here are three different checkmark styles you can use:

_x000D_
_x000D_
ul:first-child  li:before { content:"\2713\0020"; }  /* OR */_x000D_
ul:nth-child(2) li:before { content:"\2714\0020"; }  /* OR */_x000D_
ul:last-child   li:before { content:"\2611\0020"; }_x000D_
ul { list-style-type: none; }
_x000D_
<ul>_x000D_
  <li>this is my text</li>_x000D_
  <li>this is my text</li>_x000D_
  <li>this is my text</li>_x000D_
  <li>this is my text</li>_x000D_
  <li>this is my text</li>_x000D_
</ul>_x000D_
_x000D_
<ul>_x000D_
  <li>this is my text</li>_x000D_
  <li>this is my text</li>_x000D_
  <li>this is my text</li>_x000D_
  <li>this is my text</li>_x000D_
  <li>this is my text</li>_x000D_
</ul>_x000D_
_x000D_
<ul><!-- not working on Stack snippet; check fiddle demo -->_x000D_
  <li>this is my text</li>_x000D_
  <li>this is my text</li>_x000D_
  <li>this is my text</li>_x000D_
  <li>this is my text</li>_x000D_
  <li>this is my text</li>_x000D_
</ul>
_x000D_
_x000D_
_x000D_

jsFiddle

References:

VBA - If a cell in column A is not blank the column B equals

A simpler way to do this would be:

Sub populateB()

For Each Cel in Range("A1:A100")
    If Cel.value <> "" Then Cel.Offset(0, 1).value = "Your Text"
Next

End Sub

What is the fastest way to send 100,000 HTTP requests in Python?

Using a thread pool is a good option, and will make this fairly easy. Unfortunately, python doesn't have a standard library that makes thread pools ultra easy. But here is a decent library that should get you started: http://www.chrisarndt.de/projects/threadpool/

Code example from their site:

pool = ThreadPool(poolsize)
requests = makeRequests(some_callable, list_of_args, callback)
[pool.putRequest(req) for req in requests]
pool.wait()

Hope this helps.

TypeError: 'dict' object is not callable

A more functional approach would be by using dict.get

input_nums = [int(in_str) for in_str in input_str.split())
strikes = list(map(number_map.get, input_nums.split()))

One can observe that the conversion is a little clumsy, better would be to use the abstraction of function composition:

def compose2(f, g):
    return lambda x: f(g(x))

strikes = list(map(compose2(number_map.get, int), input_str.split()))

Example:

list(map(compose2(number_map.get, int), ["1", "2", "7"]))
Out[29]: [-3, -2, None]

Obviously in Python 3 you would avoid the explicit conversion to a list. A more general approach for function composition in Python can be found here.

(Remark: I came here from the Design of Computer Programs Udacity class, to write:)

def word_score(word):
    "The sum of the individual letter point scores for this word."
    return sum(map(POINTS.get, word))

Turning off auto indent when pasting text into vim

The following vim plugin handles that automatically through its "Bracketed Paste" mode: https://github.com/wincent/terminus

Sets up "Bracketed Paste" mode, which means you can forget about manually setting the 'paste' option and simply go ahead and paste in any mode.

How to run Gradle from the command line on Mac bash

Also, if you don't have the gradlew file in your current directory:

You can install gradle with homebrew with the following command:

$ brew install gradle

As mentioned in this answer. Then, you are not going to need to include it in your path (homebrew will take care of that) and you can just run (from any directory):

$ gradle test 

How to specify names of columns for x and y when joining in dplyr?

This is more a workaround than a real solution. You can create a new object test_data with another column name:

left_join("names<-"(test_data, "name"), kantrowitz, by = "name")

     name gender
1    john      M
2    bill either
3 madison      M
4    abby either
5     zzz   <NA>

HttpRequest maximum allowable size in tomcat?

The full answer

1. The default (fresh install of tomcat)

When you download tomcat from their official website (of today that's tomcat version 9.0.26), all the apps you installed to tomcat can handle HTTP requests of unlimited size, given that the apps themselves do not have any limits on request size.

However, when you try to upload an app in tomcat's manager app, that app has a default war file limit of 50MB. If you're trying to install Jenkins for example which is 77 MB as ot today, it will fail.

2. Configure tomcat's per port http request size limit

Tomcat itself has size limit for each port, and this is defined in conf\server.xml. This is controlled by maxPostSize attribute of each Connector(port). If this attribute does not exist, which it is by default, there is no limit on the request size.

To add a limit to a specific port, set a byte size for the attribute. For example, the below config for the default 8080 port limits request size to 200 MB. This means that all the apps installed under port 8080 now has the size limit of 200MB

<Connector port="8080" protocol="HTTP/1.1"
           connectionTimeout="20000"
           redirectPort="8443"
           maxPostSize="209715200" />

3. Configure app level size limit

After passing the port level size limit, you can still configure app level limit. This also means that app level limit should be less than port level limit. The limit can be done through annotation within each servlet, or in the web.xml file. Again, if this is not set at all, there is no limit on request size.

To set limit through java annotation

@WebServlet("/uploadFiles")
@MultipartConfig( fileSizeThreshold = 0, maxFileSize = 209715200, maxRequestSize = 209715200)
public class FileUploadServlet extends HttpServlet {

    public void doPost(HttpServletRequest request, HttpServletResponse response) {
        // ...
    }
}

To set limit through web.xml

<web-app>
  ...
  <servlet>
    ...
    <multipart-config>
      <file-size-threshold>0</file-size-threshold>
      <max-file-size>209715200</max-file-size>
      <max-request-size>209715200</max-request-size>
    </multipart-config>
    ...
  </servlet>
  ...
</web-app>

4. Appendix - If you see file upload size error when trying to install app through Tomcat's Manager app

Tomcat's Manager app (by default localhost:8080/manager) is nothing but a default web app. By default that app has a web.xml configuration of request limit of 50MB. To install (upload) app with size greater than 50MB through this manager app, you have to change the limit. Open the manager app's web.xml file from webapps\manager\WEB-INF\web.xml and follow the above guide to change the size limit and finally restart tomcat.

Convert base64 png data to javascript file objects

You can create a Blob from your base64 data, and then read it asDataURL:

var img_b64 = canvas.toDataURL('image/png');
var png = img_b64.split(',')[1];

var the_file = new Blob([window.atob(png)],  {type: 'image/png', encoding: 'utf-8'});

var fr = new FileReader();
fr.onload = function ( oFREvent ) {
    var v = oFREvent.target.result.split(',')[1]; // encoding is messed up here, so we fix it
    v = atob(v);
    var good_b64 = btoa(decodeURIComponent(escape(v)));
    document.getElementById("uploadPreview").src = "data:image/png;base64," + good_b64;
};
fr.readAsDataURL(the_file);

Full example (includes junk code and console log): http://jsfiddle.net/tTYb8/


Alternatively, you can use .readAsText, it works fine, and its more elegant.. but for some reason text does not sound right ;)

fr.onload = function ( oFREvent ) {
    document.getElementById("uploadPreview").src = "data:image/png;base64,"
    + btoa(oFREvent.target.result);
};
fr.readAsText(the_file, "utf-8"); // its important to specify encoding here

Full example: http://jsfiddle.net/tTYb8/3/

Is there a better jQuery solution to this.form.submit();?

Your question in somewhat confusing in that that you don't explain what you mean by "current element".

If you have multiple forms on a page with all kinds of input elements and a button of type "submit", then hitting "enter" upon filling any of it's fields will trigger submission of that form. You don't need any Javascript there.

But if you have multiple "submit" buttons on a form and no other inputs (e.g. "edit row" and/or "delete row" buttons in table), then the line you posted could be the way to do it.

Another way (no Javascript needed) could be to give different values to all your buttons (that are of type "submit"). Like this:

<form action="...">
    <input type="hidden" name="rowId" value="...">
    <button type="submit" name="myaction" value="edit">Edit</button>
    <button type="submit" name="myaction" value="delete">Delete</button>
</form>

When you click a button only the form containing the button will be submitted, and only the value of the button you hit will be sent (along other input values).

Then on the server you just read the value of the variable "myaction" and decide what to do.

SyntaxError: "can't assign to function call"

You wrote the assignment backward: to assign a value (or an expression) to a variable you must have that variable at the left side of the assignment operator ( = in python )

subsequent_amount = invest(initial_amount,top_company(5,year,year+1))

JavaScript implementation of Gzip

I had another problem, I did not want to encode data in gzip but to decode gzipped data. I am running javascript code outside of the browser so I need to decode it using pure javascript.

It took me some time but i found that in the JSXGraph library there is a way to read gzipped data.

Here is where I found the library: http://jsxgraph.uni-bayreuth.de/wp/2009/09/29/jsxcompressor-zlib-compressed-javascript-code/ There is even a standalone utility that can do that, JSXCompressor, and the code is LGPL licencied.

Just include the jsxcompressor.js file in your project and then you will be able to read a base 64 encoded gzipped data:

<!doctype html>
</head>
<title>Test gzip decompression page</title>
<script src="jsxcompressor.js"></script>
</head>
<body>
<script>
    document.write(JXG.decompress('<?php 
        echo base64_encode(gzencode("Try not. Do, or do not. There is no try.")); 
    ?>'));
</script>
</html>

I understand it is not what you wanted but I still reply here because I suspect it will help some people.

Load image from url

loadImage("http://relinjose.com/directory/filename.png");

Here you go

void loadImage(String image_location) {
    URL imageURL = null;
    if (image_location != null) {
        try {
            imageURL = new URL(image_location);         
            HttpURLConnection connection = (HttpURLConnection) imageURL
                    .openConnection();
            connection.setDoInput(true);
            connection.connect();
            InputStream inputStream = connection.getInputStream();
            bitmap = BitmapFactory.decodeStream(inputStream);// Convert to bitmap
            ivdpfirst.setImageBitmap(bitmap);
        } catch (IOException e) {
            e.printStackTrace();
        }
    } else {
        //set any default
    }
}

Authenticated HTTP proxy with Java

For Java 1.8 and higher you must set

-Djdk.http.auth.tunneling.disabledSchemes=

to make proxies with Basic Authorization working with https along with Authenticator as mentioned in accepted answer

How to draw rounded rectangle in Android UI?

You could just define a new xml background in the drawables folder

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="enter_your_desired_color_here" />
<corners android:radius="enter_your_desired_radius_the_corners" />
</shape>  

After this just include it in your TextView or EditText by defining it in the background.

<TextView
 android:id="@+id/textView"
 android:layout_width="0dp"
 android:layout_height="80dp"
 android:background="YOUR_FILE_HERE"
 Android:layout_weight="1"
 android:gravity="center"
 android:text="TEXT_HERE"
 android:textSize="40sp" />

Fastest way to check if a string is JSON in PHP?

This is what I recommend

if (!in_array(substr($string, 0, 1), ['{', '[']) || !in_array(substr($string, -1), ['}', ']'])) {
  return false;
} else {
  json_decode($string);
  return (json_last_error() === JSON_ERROR_NONE);
}

How the int.TryParse actually works

We can now in C# 7.0 and above write this:

if (int.TryParse(inputString, out _))
{
    //do stuff
}

show validation error messages on submit in angularjs

Try this code:

<INPUT TYPE="submit" VALUE="Save" onClick="validateTester()">

This funvtion will validate your result

function validateTester() {
    var flag = true
    var Tester = document.forms.Tester
    if (Tester.line1.value!="JavaScript") {
        alert("First box must say 'JavaScript'!")
        flag = false
        }
    if (Tester.line2.value!="Kit") {
        alert("Second box must say 'Kit'!")
        flag = false
        }
    if (flag) {
        alert("Form is valid! Submitting form...")
        document.forms.Tester.submit()
        }
    }

How do I implement a callback in PHP?

well... with 5.3 on the horizon, all will be better, because with 5.3, we'll get closures and with them anonymous functions

http://wiki.php.net/rfc/closures

What in the world are Spring beans?

Well you understood it partially. You have to tailor the beans according to your need and inform Spring container to manage it when required, by using a methodology populalrly known as IoC (Inversion of Control) coined by Martin Fowler, also known as Dependency Injection (DI).

You wire the beans in a way, so that you do not have to take care of the instantiating or evaluate any dependency on the bean. This is popularly known as Hollywood Principle.

Google is the best tool to explore more on this in addition to the links you would get flooded with here in this question. :)

DOUBLE vs DECIMAL in MySQL

From your comments,

the tax amount rounded to the 4th decimal and the total price rounded to the 2nd decimal.

Using the example in the comments, I might foresee a case where you have 400 sales of $1.47. Sales-before-tax would be $588.00, and sales-after-tax would sum to $636.51 (accounting for $48.51 in taxes). However, the sales tax of $0.121275 * 400 would be $48.52.

This was one way, albeit contrived, to force a penny's difference.

I would note that there are payroll tax forms from the IRS where they do not care if an error is below a certain amount (if memory serves, $0.50).

Your big question is: does anybody care if certain reports are off by a penny? If the your specs say: yes, be accurate to the penny, then you should go through the effort to convert to DECIMAL.

I have worked at a bank where a one-penny error was reported as a software defect. I tried (in vain) to cite the software specifications, which did not require this degree of precision for this application. (It was performing many chained multiplications.) I also pointed to the user acceptance test. (The software was verified and accepted.)

Alas, sometimes you just have to make the conversion. But I would encourage you to A) make sure that it's important to someone and then B) write tests to show that your reports are accurate to the degree specified.

docker: executable file not found in $PATH

I found the same problem. I did the following:

docker run -ti devops -v /tmp:/tmp /bin/bash

When I change it to

docker run -ti -v /tmp:/tmp devops /bin/bash

it works fine.

AngularJs: How to check for changes in file input fields?

Another interesting way to listen file input changes is with a watch over the ng-model attribute of the input file. Off course FileModel is a custom directive.

Like this:

HTML -> <input type="file" file-model="change.fnEvidence">

JS Code ->

$scope.$watch('change.fnEvidence', function() {
                    alert("has changed");
                });

Hope it can helps someone.

Java Mouse Event Right Click

Yes, take a look at this thread which talks about the differences between platforms.

How to detect right-click event for Mac OS

BUTTON3 is the same across all platforms, being equal to the right mouse button. BUTTON2 is simply ignored if the middle button does not exist.

Tesseract OCR simple example

I had same problem, now its resolved. I have tesseract2, under this folders for 32 bit and 64 bit, I copied files 64 bit folder(as my system is 64 bit) to main folder ("Tesseract2") and under bin/Debug folder. Now my solution is working fine.

How to select a record and update it, with a single queryset in Django?

If you need to set the new value based on the old field value that is do something like:

update my_table set field_1 = field_1 + 1 where pk_field = some_value

use query expressions:

MyModel.objects.filter(pk=some_value).update(field1=F('field1') + 1)

This will execute update atomically that is using one update request to the database without reading it first.

What does API level mean?

API level is basically the Android version. Instead of using the Android version name (eg 2.0, 2.3, 3.0, etc) an integer number is used. This number is increased with each version. Android 1.6 is API Level 4, Android 2.0 is API Level 5, Android 2.0.1 is API Level 6, and so on.

Starting iPhone app development in Linux?

It seems to be true so far. The only SDK available from Apple only targets the macOS environment. I've been upset about that, but I'm looking into buying a mac now, just to do iPhone development. I really dislike what they are doing, and I hope a good SDK come out for other environments, such as Linux and Windows.

Obstacles regarding the SDK:

The iPhone SDK and free software: not a match

Apple's recently released a software development kit (SDK) for the iPhone, but if you were hoping to port or develop original open source software with it, the news isn't good. Code signing and nondisclosure conditions make free software a no-go.

The SDK itself is a free download, with which you can write programs and run them on a software simulator. But in order to actually release software you've written, you must enroll in the iPhone Developer Program -- a step separate from downloading the SDK, and one that requires Apple's approval.

I think it's rather elitist for them to think only macOS users are good enough to write programs for their phone, and the fact you need to buy a $100 license if you want to publish your stuff, really makes it more difficult for the hobbyist programmer. Though, if that's what you need to do, I'm planning on jumping through their hoops; I'd really like to get some stuff developed on my iPhone.

How to manage startActivityForResult on Android?

Example

To see the entire process in context, here is a supplemental answer. See my fuller answer for more explanation.

enter image description here

MainActivity.java

public class MainActivity extends AppCompatActivity {

    // Add a different request code for every activity you are starting from here
    private static final int SECOND_ACTIVITY_REQUEST_CODE = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    // "Go to Second Activity" button click
    public void onButtonClick(View view) {

        // Start the SecondActivity
        Intent intent = new Intent(this, SecondActivity.class);
        startActivityForResult(intent, SECOND_ACTIVITY_REQUEST_CODE);
    }

    // This method is called when the second activity finishes
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        // check that it is the SecondActivity with an OK result
        if (requestCode == SECOND_ACTIVITY_REQUEST_CODE) {
            if (resultCode == RESULT_OK) { // Activity.RESULT_OK

                // get String data from Intent
                String returnString = data.getStringExtra("keyName");

                // set text view with string
                TextView textView = (TextView) findViewById(R.id.textView);
                textView.setText(returnString);
            }
        }
    }
}

SecondActivity.java

public class SecondActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
    }

    // "Send text back" button click
    public void onButtonClick(View view) {

        // get the text from the EditText
        EditText editText = (EditText) findViewById(R.id.editText);
        String stringToPassBack = editText.getText().toString();

        // put the String to pass back into an Intent and close this activity
        Intent intent = new Intent();
        intent.putExtra("keyName", stringToPassBack);
        setResult(RESULT_OK, intent);
        finish();
    }
}

IIS w3svc error

Run cmd as administrator. Type iisreset. That's it.

Combining CSS Pseudo-elements, ":after" the ":last-child"

I do like this for list items in <menu> elements. Consider the following markup:

<menu>
  <li><a href="/member/profile">Profile</a></li>
  <li><a href="/member/options">Options</a></li>
  <li><a href="/member/logout">Logout</a></li>
</menu>

I style it with the following CSS:

menu > li {
  display: inline;
}

menu > li::after {
  content: ' | ';
}

menu > li:last-child::after {
  content: '';
}

This will display:

Profile | Options | Logout

And this is possible because of what Martin Atkins explained on his comment

Note that in CSS 2 you would use :after, not ::after. If you use CSS 3, use ::after (two semi-columns) because ::after is a pseudo-element (a single semi-column is for pseudo-classes).

Send a base64 image in HTML email

An alternative approach may be to embed images in the email using the cid method. (Basically including the image as an attachment, and then embedding it). In my experience, this approach seems to be well supported these days.

enter image description here

Source: https://www.campaignmonitor.com/blog/how-to/2008/08/embedding-images-revisited/

docker command not found even though installed with apt-get

SET UP THE REPOSITORY

For Ubuntu 14.04/16.04/16.10/17.04:

sudo add-apt-repository "deb [arch=amd64] \
     https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

For Ubuntu 17.10:

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu zesty stable"

Add Docker’s official GPG key:

$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

Then install

$ sudo apt-get update && sudo apt-get -y install docker-ce

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

If you're comparing them in unit test, a handy alternative is EqualValues function in testify.

What is the difference between --save and --save-dev?

  1. --save-dev (only used in the development, not in production)

  2. --save (production dependencies)

  3. --global or -g (used globally i.e can be used anywhere in our local system)

How to read a file without newlines?

another example:

Reading file one row at the time. Removing unwanted chars with from end of the string str.rstrip(chars)

with open(filename, 'r') as fileobj:
    for row in fileobj:
        print( row.rstrip('\n') )

see also str.strip([chars]) and str.lstrip([chars])

(python >= 2.0)

How to download a file via FTP with Python ftplib

Please note if you are downloading from the FTP to your local, you will need to use the following:

with open( filename, 'wb' ) as file :
        ftp.retrbinary('RETR %s' % filename, file.write)

Otherwise, the script will at your local file storage rather than the FTP.

I spent a few hours making the mistake myself.

Script below:

import ftplib

# Open the FTP connection
ftp = ftplib.FTP()
ftp.cwd('/where/files-are/located')


filenames = ftp.nlst()

for filename in filenames:

    with open( filename, 'wb' ) as file :
        ftp.retrbinary('RETR %s' % filename, file.write)

        file.close()

ftp.quit()

How to convert a string or integer to binary in Ruby?

You have Integer#to_s(base) and String#to_i(base) available to you.

Integer#to_s(base) converts a decimal number to a string representing the number in the base specified:

9.to_s(2) #=> "1001"

while the reverse is obtained with String#to_i(base):

"1001".to_i(2) #=> 9

How do I concatenate text in a query in sql server?

The only way would be to convert your text field into an nvarchar field.

Select Cast(notes as nvarchar(4000)) + 'SomeText'
From NotesTable a

Otherwise, I suggest doing the concatenation in your application.

What is REST? Slightly confused

REST is not a specific web service but a design concept (architecture) for managing state information. The seminal paper on this was Roy Thomas Fielding's dissertation (2000), "Architectural Styles and the Design of Network-based Software Architectures" (available online from the University of California, Irvine).

First read Ryan Tomayko's post How I explained REST to my wife; it's a great starting point. Then read Fielding's actual dissertation. It's not that advanced, nor is it long (six chapters, 180 pages)! (I know you kids in school like it short).

EDIT: I feel it's pointless to try to explain REST. It has so many concepts like scalability, visibility (stateless) etc. that the reader needs to grasp, and the best source for understanding those are the actual dissertation. It's much more than POST/GET etc.

How to get sp_executesql result into a variable?

Here's something you can try

DECLARE  @SqlStatement  NVARCHAR(MAX) = ''
       ,@result     XML
       ,@DatabaseName  VARCHAR(100)
       ,@SchemaName    VARCHAR(10)
       ,@ObjectName    VARCHAR(200);

SELECT   @DatabaseName = 'some database'
       ,@SchemaName   = 'some schema'
       ,@ObjectName   = 'some object (Table/View)'

SET @SqlStatement = '
                    SELECT @result = CONVERT(XML,
                                            STUFF( ( SELECT *
                                                     FROM 
                                                       (
                                                          SELECT TOP(100) 
                                                          * 
                                                          FROM ' + QUOTENAME(@DatabaseName) +'.'+ QUOTENAME(@SchemaName) +'.' + QUOTENAME(@ObjectName) + '
                                                       ) AS A1 
                                                    FOR XML PATH(''row''), ELEMENTS, ROOT(''recordset'')
                                                 ), 1, 0, '''')
                                       )
                ';

EXEC sp_executesql @SqlStatement,N'@result XML OUTPUT', @result = @result OUTPUT;

SELECT DISTINCT
    QUOTENAME(r.value('fn:local-name(.)', 'VARCHAR(200)')) AS ColumnName
FROM @result.nodes('//recordset/*/*') AS records(r)
ORDER BY ColumnName

How to manually install a pypi module without pip/easy_install?

Even though Sheena's answer does the job, pip doesn't stop just there.

From Sheena's answer:

  1. Download the package
  2. unzip it if it is zipped
  3. cd into the directory containing setup.py
  4. If there are any installation instructions contained in documentation contained herein, read and follow the instructions OTHERWISE
  5. type in python setup.py install

At the end of this, you'll end up with a .egg file in site-packages. As a user, this shouldn't bother you. You can import and uninstall the package normally. However, if you want to do it the pip way, you can continue the following steps.

In the site-packages directory,

  1. unzip <.egg file>
  2. rename the EGG-INFO directory as <pkg>-<version>.dist-info
  3. Now you'll see a separate directory with the package name, <pkg-directory>
  4. find <pkg-directory> > <pkg>-<version>.dist-info/RECORD
  5. find <pkg>-<version>.dist-info >> <pkg>-<version>.dist-info/RECORD. The >> is to prevent overwrite.

Now, looking at the site-packages directory, you'll never realize you installed without pip. To uninstall, just do the usual pip uninstall <pkg>.

CSS rule to apply only if element has BOTH classes

div.abc.xyz {
    /* rules go here */
}

... or simply:

.abc.xyz {
    /* rules go here */
}

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

To extract Google Drive zip from a Google colab notebook for example:

import zipfile
from google.colab import drive

drive.mount('/content/drive/')

zip_ref = zipfile.ZipFile("/content/drive/My Drive/ML/DataSet.zip", 'r')
zip_ref.extractall("/tmp")
zip_ref.close()

Convert list to tuple in Python

It should work fine. Don't use tuple, list or other special names as a variable name. It's probably what's causing your problem.

>>> l = [4,5,6]
>>> tuple(l)
(4, 5, 6)

>>> tuple = 'whoops'   # Don't do this
>>> tuple(l)
TypeError: 'tuple' object is not callable

How to make a redirection on page load in JSF 1.x

Assume that foo.jsp is your jsp file. and following code is the button that you want do redirect.

<h:commandButton value="Redirect" action="#{trial.enter }"/>  

And now we'll check the method for directing in your java (service) class

 public String enter() {
            if (userName.equals("xyz") && password.equals("123")) {
                return "enter";
            } else {
                return null;
            }
        } 

and now this is a part of faces-config.xml file

<managed-bean>
        <managed-bean-name>'class_name'</managed-bean-name>
        <managed-bean-class>'package_name'</managed-bean-class>
        <managed-bean-scope>request</managed-bean-scope>
    </managed-bean>


    <navigation-case>
                <from-outcome>enter</from-outcome>
                <to-view-id>/foo.jsp</to-view-id>
                <redirect />
            </navigation-case>

python dict to numpy structured array

Let me propose an improved method when the values of the dictionnary are lists with the same lenght :

import numpy

def dctToNdarray (dd, szFormat = 'f8'):
    '''
    Convert a 'rectangular' dictionnary to numpy NdArray
    entry 
        dd : dictionnary (same len of list 
    retrun
        data : numpy NdArray 
    '''
    names = dd.keys()
    firstKey = dd.keys()[0]
    formats = [szFormat]*len(names)
    dtype = dict(names = names, formats=formats)
    values = [tuple(dd[k][0] for k in dd.keys())]
    data = numpy.array(values, dtype=dtype)
    for i in range(1,len(dd[firstKey])) :
        values = [tuple(dd[k][i] for k in dd.keys())]
        data_tmp = numpy.array(values, dtype=dtype)
        data = numpy.concatenate((data,data_tmp))
    return data

dd = {'a':[1,2.05,25.48],'b':[2,1.07,9],'c':[3,3.01,6.14]}
data = dctToNdarray(dd)
print data.dtype.names
print data

What is the purpose for using OPTION(MAXDOP 1) in SQL Server?

There are a couple of parallization bugs in SQL server with abnormal input. OPTION(MAXDOP 1) will sidestep them.

EDIT: Old. My testing was done largely on SQL 2005. Most of these seem to not exist anymore, but every once in awhile we question the assumption when SQL 2014 does something dumb and we go back to the old way and it works. We never managed to demonstrate that it wasn't just a bad plan generation on more recent cases though since SQL server can be relied on to get the old way right in newer versions. Since all cases were IO bound queries MAXDOP 1 doesn't hurt.

When to use IList and when to use List

IEnumerable
You should try and use the least specific type that suits your purpose.
IEnumerable is less specific than IList.
You use IEnumerable when you want to loop through the items in a collection.

IList
IList implements IEnumerable.
You should use IList when you need access by index to your collection, add and delete elements, etc...

List
List implements IList.

React / JSX Dynamic Component Name

Edit: Other answers are better, see comments.

I solved the same problem this way:

...
render : function () {
  var componentToRender = 'component1Name';
  var componentLookup = {
    component1Name : (<Component1 />),
    component2Name : (<Component2 />),
    ...
  };
  return (<div>
    {componentLookup[componentToRender]}
  </div>);
}
...

Export pictures from excel file into jpg using VBA

''' Set Range you want to export to the folder

Workbooks("your workbook name").Sheets("yoursheet name").Select

Dim rgExp As Range: Set rgExp = Range("A1:H31")
''' Copy range as picture onto Clipboard
rgExp.CopyPicture Appearance:=xlScreen, Format:=xlBitmap
''' Create an empty chart with exact size of range copied
With ActiveSheet.ChartObjects.Add(Left:=rgExp.Left, Top:=rgExp.Top, _
Width:=rgExp.Width, Height:=rgExp.Height)
.Name = "ChartVolumeMetricsDevEXPORT"
.Activate
End With
''' Paste into chart area, export to file, delete chart.
ActiveChart.Paste
ActiveSheet.ChartObjects("ChartVolumeMetricsDevEXPORT").Chart.Export "C:\ExportmyChart.jpg"
ActiveSheet.ChartObjects("ChartVolumeMetricsDevEXPORT").Delete

What is a monad?

But, You could have invented Monads!

sigfpe says:

But all of these introduce monads as something esoteric in need of explanation. But what I want to argue is that they aren't esoteric at all. In fact, faced with various problems in functional programming you would have been led, inexorably, to certain solutions, all of which are examples of monads. In fact, I hope to get you to invent them now if you haven't already. It's then a small step to notice that all of these solutions are in fact the same solution in disguise. And after reading this, you might be in a better position to understand other documents on monads because you'll recognise everything you see as something you've already invented.

Many of the problems that monads try to solve are related to the issue of side effects. So we'll start with them. (Note that monads let you do more than handle side-effects, in particular many types of container object can be viewed as monads. Some of the introductions to monads find it hard to reconcile these two different uses of monads and concentrate on just one or the other.)

In an imperative programming language such as C++, functions behave nothing like the functions of mathematics. For example, suppose we have a C++ function that takes a single floating point argument and returns a floating point result. Superficially it might seem a little like a mathematical function mapping reals to reals, but a C++ function can do more than just return a number that depends on its arguments. It can read and write the values of global variables as well as writing output to the screen and receiving input from the user. In a pure functional language, however, a function can only read what is supplied to it in its arguments and the only way it can have an effect on the world is through the values it returns.

Java string to date conversion

Also, SimpleDateFormat is not available with some of the client-side technologies, like GWT.

It's a good idea to go for Calendar.getInstance(), and your requirement is to compare two dates; go for long date.

Find text in string with C#

Here's my function using Oscar Jara's function as a model.

public static string getBetween(string strSource, string strStart, string strEnd) {
   const int kNotFound = -1;

   var startIdx = strSource.IndexOf(strStart);
   if (startIdx != kNotFound) {
      startIdx += strStart.Length;
      var endIdx = strSource.IndexOf(strEnd, startIdx);
      if (endIdx > startIdx) {
         return strSource.Substring(startIdx, endIdx - startIdx);
      }
   }
   return String.Empty;
}

This version does at most two searches of the text. It avoids an exception thrown by Oscar's version when searching for an end string that only occurs before the start string, i.e., getBetween(text, "my", "and");.

Usage is the same:

string text = "This is an example string and my data is here";
string data = getBetween(text, "my", "is");

Bind TextBox on Enter-key press

A different solution (not using xaml but still quite clean I think).

class ReturnKeyTextBox : TextBox
{
    protected override void OnKeyUp(KeyEventArgs e)
    {
        base.OnKeyUp(e);
        if (e.Key == Key.Return)
            GetBindingExpression(TextProperty).UpdateSource();
    }
}

Java LinkedHashMap get first or last entry

public static List<Fragment> pullToBackStack() {
    List<Fragment> fragments = new ArrayList<>();
    List<Map.Entry<String, Fragment>> entryList = new ArrayList<>(backMap.entrySet());
    int size = entryList.size();
    if (size > 0) {
        for (int i = size - 1; i >= 0; i--) {// last Fragments
            fragments.add(entryList.get(i).getValue());
            backMap.remove(entryList.get(i).getKey());
        }
        return fragments;
    }
    return null;
}

How to get client's IP address using JavaScript?

Java Script to find IP

To get the IP Address I am making a JSON call to the Free Web Service. like

[jsonip.com/json, ipinfo.io/json, www.telize.com/geoip, ip-api.com/json, api.hostip.info/get_json.php]

and I am passing the name of the callback function which will be called on completion of the request.

<script type="text/javascript">
    window.onload = function () {
    var webService = "http://www.telize.com/geoip";
        var script = document.createElement("script");
        script.type = "text/javascript";
        script.src = webService+"?callback=MyIP";
        document.getElementsByTagName("head")[0].appendChild(script);
    };
    function MyIP(response) {
        document.getElementById("ipaddress").innerHTML = "Your IP Address is " + response.ip;
    }
</script>
<body>
    <form>
        <span id = "ipaddress"></span>
    </form>
</body>

for xml response code

WebRTC which doesn't require server support.

How do I check that multiple keys are in a dict in a single pass?

In case you want to:

  • also get the values for the keys
  • check more than one dictonary

then:

from operator import itemgetter
foo = {'foo':1,'zip':2,'zam':3,'bar':4}
keys = ("foo","bar") 
getter = itemgetter(*keys) # returns all values
try:
    values = getter(foo)
except KeyError:
    # not both keys exist
    pass

Download a div in a HTML page as pdf using javascript

Your solution requires some ajax method to pass the html to a back-end server that has a html to pdf facility and then returning the pdf output generated back to the browser.

First setting up the client side code, we will setup the jquery code as

   var options = {
            "url": "/pdf/generate/convert_to_pdf.php",
            "data": "data=" + $("#content").html(),
            "type": "post",
        }
   $.ajax(options)

Then intercept the data from the html2pdf generation script (somewhere from the internet).
convert_to_pdf.php (given as url in JQUERY code) looks like this -

<?php
    $html = $_POST['data'];
    $pdf = html2pdf($html);
    
    header("Content-Type: application/pdf"); //check this is the proper header for pdf
    header("Content-Disposition: attachment; filename='some.pdf';");
    echo $pdf;
?>

How to filter for multiple criteria in Excel?

You can pass an array as the first AutoFilter argument and use the xlFilterValues operator.

This will display PDF, DOC and DOCX filetypes.

Criteria1:=Array(".pdf", ".doc", ".docx"), Operator:=xlFilterValues

WCF service maxReceivedMessageSize basicHttpBinding issue

Removing the name from your binding will make it apply to all endpoints, and should produce the desired results. As so:

<services>
  <service name="Service.IService">
    <clear />
    <endpoint binding="basicHttpBinding" contract="Service.IService" />
  </service>
</services>
<bindings>
  <basicHttpBinding>
    <binding maxBufferSize="2147483647" maxReceivedMessageSize="2147483647">
      <readerQuotas maxDepth="32" maxStringContentLength="2147483647"
        maxArrayLength="16348" maxBytesPerRead="4096" maxNameTableCharCount="16384" />
    </binding>
  </basicHttpBinding>
  <webHttpBinding>
    <binding maxBufferSize="2147483647" maxReceivedMessageSize="2147483647" />
  </webHttpBinding>
</bindings>

Also note that I removed the bindingConfiguration attribute from the endpoint node. Otherwise you would get an exception.

This same solution was found here : Problem with large requests in WCF

How do you access a website running on localhost from iPhone browser

If you are using mac (OSX) :

On you mac:

  1. Open Terminal
  2. run "ifconfig"
  3. Find the line with the ip adress "192.xx.x.x"

If you are testing your website with the address : "localhost:8888/mywebsite" (it depends on your MAMP configurations)

On your phone :

  1. Open your browser (e.g Safari)
  2. Enter the URL 192.xxx.x.x:8888/mywebsite

Note : you have to be connected on the same network (wifi)

Collections.emptyList() vs. new instance

Be carefully though. If you return Collections.emptyList() and then try to do some changes with it like add() or smth like that, u will have an UnsupportedOperationException() because Collections.emptyList() returns an immutable object.

How to Validate on Max File Size in Laravel?

Edit: Warning! This answer worked on my XAMPP OsX environment, but when I deployed it to AWS EC2 it did NOT prevent the upload attempt.

I was tempted to delete this answer as it is WRONG But instead I will explain what tripped me up

My file upload field is named 'upload' so I was getting "The upload failed to upload.". This message comes from this line in validation.php:

in resources/lang/en/validaton.php:

'uploaded' => 'The :attribute failed to upload.',

And this is the message displayed when the file is larger than the limit set by PHP.

I want to over-ride this message, which you normally can do by passing a third parameter $messages array to Validator::make() method.

However I can't do that as I am calling the POST from a React Component, which renders the form containing the csrf field and the upload field.

So instead, as a super-dodgy-hack, I chose to get into my view that displays the messages and replace that specific message with my friendly 'file too large' message.

Here is what works if the file to smaller than the PHP file size limit:

In case anyone else is using Laravel FormRequest class, here is what worked for me on Laravel 5.7:

This is how I set a custom error message and maximum file size:

I have an input field <input type="file" name="upload">. Note the CSRF token is required also in the form (google laravel csrf_field for what this means).

<?php
namespace App\Http\Requests;
use Illuminate\Foundation\Http\FormRequest;
class Upload extends FormRequest
{
  ...
  ...
  public function rules() {
    return [
      'upload' => 'required|file|max:8192',
    ];
  }
  public function messages()
  {
    return [            
      'upload.required' => "You must use the 'Choose file' button to select which file you wish to upload",
      'upload.max' => "Maximum file size to upload is 8MB (8192 KB). If you are uploading a photo, try to reduce its resolution to make it under 8MB"
    ];
  }
}

How do I force my .NET application to run as administrator?

I implemented some code to do it manually:

using System.Security.Principal;
public bool IsUserAdministrator()
{
    bool isAdmin;
    try
    {
        WindowsIdentity user = WindowsIdentity.GetCurrent();
        WindowsPrincipal principal = new WindowsPrincipal(user);
        isAdmin = principal.IsInRole(WindowsBuiltInRole.Administrator);
    }
    catch (UnauthorizedAccessException ex)
    {
        isAdmin = false;
    }
    catch (Exception ex)
    {
        isAdmin = false;
    }
    return isAdmin;
}

Exit a Script On Error

Are you looking for exit?

This is the best bash guide around. http://tldp.org/LDP/abs/html/

In context:

if jarsigner -verbose -keystore $keyst -keystore $pass $jar_file $kalias
then
    echo $jar_file signed sucessfully
else
    echo ERROR: Failed to sign $jar_file. Please recheck the variables 1>&2
    exit 1 # terminate and indicate error
fi

...

Vue.js getting an element within a component

Composition API

Template refs section tells how this has been unified:

  • within template, use ref="myEl"; :ref= with a v-for
  • within script, have a const myEl = ref(null) and expose it from setup

The reference carries the DOM element from mounting onwards.

Swift convert unix time to date and time

It's simple to convert the Unix timestamp into the desired format. Lets suppose _ts is the Unix timestamp in long

let date = NSDate(timeIntervalSince1970: _ts)

let dayTimePeriodFormatter = NSDateFormatter()
dayTimePeriodFormatter.dateFormat = "MMM dd YYYY hh:mm a"

 let dateString = dayTimePeriodFormatter.stringFromDate(date)

  print( " _ts value is \(_ts)")
  print( " _ts value is \(dateString)")

How to convert decimal to hexadecimal in JavaScript

If you need to handle things like bit fields or 32-bit colors, then you need to deal with signed numbers. The JavaScript function toString(16) will return a negative hexadecimal number which is usually not what you want. This function does some crazy addition to make it a positive number.

_x000D_
_x000D_
function decimalToHexString(number)_x000D_
{_x000D_
  if (number < 0)_x000D_
  {_x000D_
    number = 0xFFFFFFFF + number + 1;_x000D_
  }_x000D_
_x000D_
  return number.toString(16).toUpperCase();_x000D_
}_x000D_
_x000D_
console.log(decimalToHexString(27));_x000D_
console.log(decimalToHexString(48.6));
_x000D_
_x000D_
_x000D_

Linux Script to check if process is running and act on the result

I have adopted your script for my situation Jotne.

#! /bin/bash

logfile="/var/oscamlog/oscam1check.log"

case "$(pidof oscam1 | wc -w)" in

0)  echo "oscam1 not running, restarting oscam1:     $(date)" >> $logfile
    /usr/local/bin/oscam1 -b -c /usr/local/etc/oscam1 -t /usr/local/tmp.oscam1 &
    ;;
2)  echo "oscam1 running, all OK:     $(date)" >> $logfile
    ;;
*)  echo "multiple instances of oscam1 running. Stopping & restarting oscam1:     $(date)" >> $logfile
    kill $(pidof oscam1 | awk '{print $1}')
    ;;
esac

While I was testing, I ran into a problem.. I started 3 extra process's of oscam1 with this line: /usr/local/bin/oscam1 -b -c /usr/local/etc/oscam1 -t /usr/local/tmp.oscam1 which left me with 8 process for oscam1. the problem is this.. When I run the script, It only kills 2 process's at a time, so I would have to run it 3 times to get it down to 2 process..

Other than killall -9 oscam1 followed by /usr/local/bin/oscam1 -b -c /usr/local/etc/oscam1 -t /usr/local/tmp.oscam1, in *)is there any better way to killall apart from the original process? So there would be zero downtime?

How do I get a list of all the duplicate items using pandas in python?

With Pandas version 0.17, you can set 'keep = False' in the duplicated function to get all the duplicate items.

In [1]: import pandas as pd

In [2]: df = pd.DataFrame(['a','b','c','d','a','b'])

In [3]: df
Out[3]: 
       0
    0  a
    1  b
    2  c
    3  d
    4  a
    5  b

In [4]: df[df.duplicated(keep=False)]
Out[4]: 
       0
    0  a
    1  b
    4  a
    5  b

SQL (MySQL) vs NoSQL (CouchDB)

One of the best options is to go for MongoDB(NOSql dB) that supports scalability.Stores large amounts of data nothing but bigdata in the form of documents unlike rows and tables in sql.This is fasters that follows sharding of the data.Uses replicasets to ensure data guarantee that maintains multiple servers having primary db server as the base. Language independent. Flexible to use

How to do select from where x is equal to multiple values?

You can try using parentheses around the OR expressions to make sure your query is interpreted correctly, or more concisely, use IN:

SELECT ads.*, location.county 
FROM ads
LEFT JOIN location ON location.county = ads.county_id
WHERE ads.published = 1 
AND ads.type = 13
AND ads.county_id IN (2,5,7,9)

How to paste text to end of every line? Sublime 2

Let's say you have these lines of code:

test line one
test line two
test line three
test line four

Using Search and Replace Ctrl+H with Regex let's find this: ^ and replace it with ", we'll have this:

"test line one
"test line two
"test line three
"test line four

Now let's search this: $ and replace it with ", now we'll have this:

"test line one"
"test line two"
"test line three"
"test line four"

css selector to match an element without attribute x

:not selector:

input:not([type]), input[type='text'], input[type='password'] {
    /* style here */
}

Support: in Internet Explorer 9 and higher

python paramiko ssh

###### Use paramiko to connect to LINUX platform############
import paramiko

ip='server ip'
port=22
username='username'
password='password'
ssh=paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(ip,port,username,password)

--------Connection Established-----------------------------

######To run shell commands on remote connection###########
import paramiko

ip='server ip'
port=22
username='username'
password='password'
ssh=paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect(ip,port,username,password)


stdin,stdout,stderr=ssh.exec_command(cmd)
outlines=stdout.readlines()
resp=''.join(outlines)
print(resp) # Output 

How to fix div on scroll

I made a mix of the answers here, took the code of @Julian and ideas from the others, seems clearer to me, this is what's left:

fiddle http://jsfiddle.net/wq2Ej/

jquery

//store the element
var $cache = $('.my-sticky-element');

//store the initial position of the element
var vTop = $cache.offset().top - parseFloat($cache.css('marginTop').replace(/auto/, 0));
  $(window).scroll(function (event) {
    // what the y position of the scroll is
    var y = $(this).scrollTop();

    // whether that's below the form
    if (y >= vTop) {
      // if so, ad the fixed class
      $cache.addClass('stuck');
    } else {
      // otherwise remove it
      $cache.removeClass('stuck');
    }
  });

css:

.my-sticky-element.stuck {
    position:fixed;
    top:0;
    box-shadow:0 2px 4px rgba(0, 0, 0, .3);
}

Hibernate: hbm2ddl.auto=update in production?

We do it in a project running in production for months now and never had a problem so far. Keep in mind the 2 ingredients needed for this recipe:

  1. Design your object model with a backwards-compatibility approach, that is deprecate objects and attributes rather than removing/altering them. This means that if you need to change the name of an object or attribute, leave the old one as is, add the new one and write some kind of migration script. If you need to change an association between objects, if you already are in production, this means that your design was wrong in the first place, so try to think of a new way of expressing the new relationship, without affecting old data.

  2. Always backup the database prior to deployment.

My sense is - after reading this post - that 90% of the people taking part in this discussion are horrified just with the thought of using automations like this in a production environment. Some throw the ball at the DBA. Take a moment though to consider that not all production environments will provide a DBA and not many dev teams are able to afford one (at least for medium size projects). So, if we're talking about teams where everyone has to do everything, the ball is on them.

In this case, why not just try to have the best of both worlds? Tools like this are here to give a helping hand, which - with a careful design and plan - can help in many situations. And believe me, administrators may initially be hard to convince but if they know that the ball is not on their hands, they will love it.

Personally, I'd never go back to writing scripts by hand for extending any type of schema, but that's just my opinion. And after starting to adopt NoSQL schema-less databases recently, I can see that more than soon, all these schema-based operations will belong to the past, so you'd better start changing your perspective and look ahead.

How to get data from observable in angular2

You need to subscribe to the observable and pass a callback that processes emitted values

this.myService.getConfig().subscribe(val => console.log(val));

How do I translate an ISO 8601 datetime string into a Python datetime object?

Here is a super simple way to do these kind of conversions. No parsing, or extra libraries required. It is clean, simple, and fast.

import datetime
import time

################################################
#
# Takes the time (in seconds),
#   and returns a string of the time in ISO8601 format.
# Note: Timezone is UTC
#
################################################

def TimeToISO8601(seconds):
   strKv = datetime.datetime.fromtimestamp(seconds).strftime('%Y-%m-%d')
   strKv = strKv + "T"
   strKv = strKv + datetime.datetime.fromtimestamp(seconds).strftime('%H:%M:%S')
   strKv = strKv +"Z"
   return strKv

################################################
#
# Takes a string of the time in ISO8601 format,
#   and returns the time (in seconds).
# Note: Timezone is UTC
#
################################################

def ISO8601ToTime(strISOTime):
   K1 = 0
   K2 = 9999999999
   K3 = 0
   counter = 0
   while counter < 95:
     K3 = (K1 + K2) / 2
     strK4 = TimeToISO8601(K3)
     if strK4 < strISOTime:
       K1 = K3
     if strK4 > strISOTime:
       K2 = K3
     counter = counter + 1
   return K3

################################################
#
# Takes a string of the time in ISO8601 (UTC) format,
#   and returns a python DateTime object.
# Note: returned value is your local time zone.
#
################################################

def ISO8601ToDateTime(strISOTime):
   return time.gmtime(ISO8601ToTime(strISOTime))


#To test:
Test = "2014-09-27T12:05:06.9876"
print ("The test value is: " + Test)
Ans = ISO8601ToTime(Test)
print ("The answer in seconds is: " + str(Ans))
print ("And a Python datetime object is: " + str(ISO8601ToDateTime(Test)))

How to convert a string of numbers to an array of numbers?

A more shorter solution: map and pass the arguments to Number:

_x000D_
_x000D_
var a = "1,2,3,4";_x000D_
var b = a.split(',');_x000D_
console.log(b);_x000D_
var c = b.map(Number);_x000D_
console.log(c);
_x000D_
_x000D_
_x000D_

How to do this using jQuery - document.getElementById("selectlist").value

Chaos is spot on, though for these sorts of questions you should check out the Jquery Documentation online - it really is quite comprehensive. The feature you are after is called 'jquery selectors'

Generally you do $('#ID').val() - the .afterwards can do a number of things on the element that is returned from the selector. You can also select all of the elements on a certain class and do something to each of them. Check out the documentation for some good examples.

Java String new line

System.out.println("I\nam\na\nboy");

System.out.println("I am a boy".replaceAll("\\s+","\n"));

System.out.println("I am a boy".replaceAll("\\s+",System.getProperty("line.separator"))); // portable way

How to set java.net.preferIPv4Stack=true at runtime?

you can set the environment variable JAVA_TOOL_OPTS like as follows, which will be picked by JVM for any application.

set JAVA_TOOL_OPTS=-Djava.net.preferIPv4Stack=true

You can set this from the command prompt or set in system environment variables, based on your need. Note that this will reflect into all the java applications that run in your machine, even if it's a java interpreter that you have in a private setup.

Changing project port number in Visual Studio 2013

  • Open Solution file (.sln) in Editable mode (Notepad or notepad++ or any other tool)
  • Find tag name VMDPort and update it to your desired port.

see below snap.

enter image description here

How can I make a CSS table fit the screen width?

There is already a good solution to the problem you are having. Everyone has been forgetting the CSS property font-size: the last but not least solution. One can decrease the font size by 2 to 3 pixels. It may still be visible to the user and for somewhat you can decrease the width of the table. This worked for me. My table has 5 columns with 4 showing perfectly, but the fifth column went out of the viewport. To fix the problem, I decreased the font size and all five columns were fitted onto the screen.

table th td {
  font-size: 14px;
}

For your information, if your table has too many columns and you are not able to decrease, then make the font size small. It will get rid of the horizontal scroll. There are two advantages: your style for mobile web will remain the same (good without horizontal scroll) and when user sees small sizes, most users will zoom into the table to their comfort level.

What's the difference between JavaScript and JScript?

According to this article:

  • JavaScript is a scripting language developed by Netscape Communications designed for developing client and server Internet applications. Netscape Navigator is designed to interpret JavaScript embedded into Web pages. JavaScript is independent of Sun Microsystem's Java language.

  • Microsoft JScript is an open implementation of Netscape's JavaScript. JScript is a high-performance scripting language designed to create active online content for the World Wide Web. JScript allows developers to link and automate a wide variety of objects in Web pages, including ActiveX controls and Java programs. Microsoft Internet Explorer is designed to interpret JScript embedded into Web pages.

How can I Convert HTML to Text in C#?

What you are looking for is a text-mode DOM renderer that outputs text, much like Lynx or other Text browsers...This is much harder to do than you would expect.

How to mount the android img file under linux?

Another option would be to use the File Explorer in DDMS (Eclipse SDK), you can see the whole file system there and download/upload files to the desired place. That way you don't have to mount and deal with images. Just remember to set your device as USB debuggable (from Developer Tools)

How can one check to see if a remote file exists using PHP?

A radical solution would be to display the favicons as background images in a div above your default icon. That way, all overhead would be placed on the client while still not displaying broken images (missing background images are ignored in all browsers AFAIK).

How do I join two lines in vi?

If you want to join the selected lines (you are in visual mode), then just press gJ to join your lines with no spaces whatsoever.

This is described in greater detail on the vi/Vim Stack Exchange site.

Assign variable value inside if-statement

You can assign a variable inside of if statement, but you must declare it first

RSA: Get exponent and modulus given a public key

I manage to find the answer for this solution, have to do javascript injection for this to install atob

const atob:any = require('atob');
asn1(pem: any){
      asn1parser.Enc.base64ToBuf = function (b64:any) {
    return asn1parser.Enc.binToBuf(atob(b64));
  };
  const dertest = asn1parser.PEM.parseBlock(pem).der;
   var hex = asn1parser.Enc.bufToHex(asn1parser.PEM.parseBlock(pem).der)
   var buf = asn1parser.ASN1.parse(dertest);
  var asn1 = JSON.stringify(asn1parser.ASN1.parse(dertest), asn1parser.ASN1._replacer, 2 );

Clear and refresh jQuery Chosen dropdown list

If in case trigger("chosen:updated"); doesn't works for you. You can try $('#ddl').trigger('change'); as in my case its work for me.

Div not expanding even with content inside

There are two solutions to fix this:

  1. Use clear:both after the last floated tag. This works good.
  2. If you have fixed height for your div or clipping of content is fine, go with: overflow: hidden

How to fix symbol lookup error: undefined symbol errors in a cluster environment

After two dozens of comments to understand the situation, it was found that the libhdf5.so.7 was actually a symlink (with several levels of indirection) to a file that was not shared between the queued processes and the interactive processes. This means even though the symlink itself lies on a shared filesystem, the contents of the file do not and as a result the process was seeing different versions of the library.

For future reference: other than checking LD_LIBRARY_PATH, it's always a good idea to check a library with nm -D to see if the symbols actually exist. In this case it was found that they do exist in interactive mode but not when run in the queue. A quick md5sum revealed that the files were actually different.

What command means "do nothing" in a conditional in Bash?

Although I'm not answering the original question concering the no-op command, many (if not most) problems when one may think "in this branch I have to do nothing" can be bypassed by simply restructuring the logic so that this branch won't occur.

I try to give a general rule by using the OPs example

do nothing when $a is greater than "10", print "1" if $a is less than "5", otherwise, print "2"

we have to avoid a branch where $a gets more than 10, so $a < 10 as a general condition can be applied to every other, following condition.

In general terms, when you say do nothing when X, then rephrase it as avoid a branch where X. Usually you can make the avoidance happen by simply negating X and applying it to all other conditions.

So the OPs example with the rule applied may be restructured as:

if [ "$a" -lt 10 ] && [ "$a" -le 5 ]
then
    echo "1"
elif [ "$a" -lt 10 ]
then
    echo "2"
fi

Just a variation of the above, enclosing everything in the $a < 10 condition:

if [ "$a" -lt 10 ]
then
    if [ "$a" -le 5 ]
    then
        echo "1"
    else
        echo "2"
    fi
fi

(For this specific example @Flimzys restructuring is certainly better, but I wanted to give a general rule for all the people searching how to do nothing.)

Set default time in bootstrap-datetimepicker

Momentjs.com has good documentation on how to manipulate the date/time in relation to the current moment. Since Momentjs is required for the Datetimepicker, might as well use it.

var startDefault = moment().startof('day').add(1, 'minutes');
$('#startdatetime-from').datetimepicker({
    defaultDate: startDefault,
    language: 'en',
    format: 'yyyy-MM-dd hh:mm'
});

Returning an empty array

return new File[0];

This is better and efficient approach.

HashMap get/put complexity

HashMap operation is dependent factor of hashCode implementation. For the ideal scenario lets say the good hash implementation which provide unique hash code for every object (No hash collision) then the best, worst and average case scenario would be O(1). Let's consider a scenario where a bad implementation of hashCode always returns 1 or such hash which has hash collision. In this case the time complexity would be O(n).

Now coming to the second part of the question about memory, then yes memory constraint would be taken care by JVM.

Get the new record primary key ID from MySQL insert query?

simply use "$last_id = mysqli_insert_id($conn);"

C# 4.0 optional out/ref arguments

No, but another great alternative is having the method use a generic template class for optional parameters as follows:

public class OptionalOut<Type>
{
    public Type Result { get; set; }
}

Then you can use it as follows:

public string foo(string value, OptionalOut<int> outResult = null)
{
    // .. do something

    if (outResult != null) {
        outResult.Result = 100;
    }

    return value;
}

public void bar ()
{
    string str = "bar";

    string result;
    OptionalOut<int> optional = new OptionalOut<int> ();

    // example: call without the optional out parameter
    result = foo (str);
    Console.WriteLine ("Output was {0} with no optional value used", result);

    // example: call it with optional parameter
    result = foo (str, optional);
    Console.WriteLine ("Output was {0} with optional value of {1}", result, optional.Result);

    // example: call it with named optional parameter
    foo (str, outResult: optional);
    Console.WriteLine ("Output was {0} with optional value of {1}", result, optional.Result);
}

Can't check signature: public key not found

You need the public key in your gpg key ring. To import the public key into your public keyring, place the public key block in a text file with a .gpg extension, and then issue the following command:

gpg --import <your-file>.gpg

The entity that encrypted the file should provide you with such a block. For example, ftp://ftp.gnu.org/gnu/gnu-keyring.gpg has the block for gnu.org.

For an even more in-depth explanation see Verifying files with GPG, without a .sig or .asc file?

Div width 100% minus fixed amount of pixels

You can use nested elements and padding to get a left and right edge on the toolbar. The default width of a div element is auto, which means that it uses the available width. You can then add padding to the element and it still keeps within the available width.

Here is an example that you can use for putting images as left and right rounded corners, and a center image that repeats between them.

The HTML:

<div class="Header">
   <div>
      <div>This is the dynamic center area</div>
   </div>
</div>

The CSS:

.Header {
   background: url(left.gif) no-repeat;
   padding-left: 30px;
}
.Header div {
   background: url(right.gif) top right no-repeat;
   padding-right: 30px;
}
.Header div div {
   background: url(center.gif) repeat-x;
   padding: 0;
   height: 30px;
}

How can I convert a file pointer ( FILE* fp ) to a file descriptor (int fd)?

Even if fileno(FILE *) may return a file descriptor, be VERY careful not to bypass stdio's buffer. If there is buffer data (either read or unflushed write), reads/writes from the file descriptor might give you unexpected results.

To answer one of the side questions, to convert a file descriptor to a FILE pointer, use fdopen(3)

How to trim a string after a specific character in java

Use a Scanner and pass in the delimiter and the original string:

result = new Scanner(result).useDelimiter("\n").next();

How to post SOAP Request from PHP

You might want to look here and here.

A Little code example from the first link:

<?php
// include the SOAP classes
require_once('nusoap.php');
// define parameter array (ISBN number)
$param = array('isbn'=>'0385503954');
// define path to server application
$serverpath ='http://services.xmethods.net:80/soap/servlet/rpcrouter';
//define method namespace
$namespace="urn:xmethods-BNPriceCheck";
// create client object
$client = new soapclient($serverpath);
// make the call
$price = $client->call('getPrice',$param,$namespace);
// if a fault occurred, output error info
if (isset($fault)) {
        print "Error: ". $fault;
        }
else if ($price == -1) {
        print "The book is not in the database.";
} else {
        // otherwise output the result
        print "The price of book number ". $param[isbn] ." is $". $price;
        }
// kill object
unset($client);
?>

How can I count text lines inside an DOM element? Can I?

getClientRects return the client rects like this and if you want to get the lines, use the follow function like this

function getRowRects(element) {
    var rects = [],
        clientRects = element.getClientRects(),
        len = clientRects.length,
        clientRect, top, rectsLen, rect, i;

    for(i=0; i<len; i++) {
        has = false;
        rectsLen = rects.length;
        clientRect = clientRects[i];
        top = clientRect.top;
        while(rectsLen--) {
            rect = rects[rectsLen];
            if (rect.top == top) {
                has = true;
                break;
            }
        }
        if(has) {
            rect.right = rect.right > clientRect.right ? rect.right : clientRect.right;
            rect.width = rect.right - rect.left;
        }
        else {
            rects.push({
                top: clientRect.top,
                right: clientRect.right,
                bottom: clientRect.bottom,
                left: clientRect.left,
                width: clientRect.width,
                height: clientRect.height
            });
        }
    }
    return rects;
}

Using group by on multiple columns

Here I am going to explain not only the GROUP clause use, but also the Aggregate functions use.

The GROUP BY clause is used in conjunction with the aggregate functions to group the result-set by one or more columns. e.g.:

-- GROUP BY with one parameter:
SELECT column_name, AGGREGATE_FUNCTION(column_name)
FROM table_name
WHERE column_name operator value
GROUP BY column_name;

-- GROUP BY with two parameters:
SELECT
    column_name1,
    column_name2,
    AGGREGATE_FUNCTION(column_name3)
FROM
    table_name
GROUP BY
    column_name1,
    column_name2;

Remember this order:

  1. SELECT (is used to select data from a database)

  2. FROM (clause is used to list the tables)

  3. WHERE (clause is used to filter records)

  4. GROUP BY (clause can be used in a SELECT statement to collect data across multiple records and group the results by one or more columns)

  5. HAVING (clause is used in combination with the GROUP BY clause to restrict the groups of returned rows to only those whose the condition is TRUE)

  6. ORDER BY (keyword is used to sort the result-set)

You can use all of these if you are using aggregate functions, and this is the order that they must be set, otherwise you can get an error.

Aggregate Functions are:

MIN() returns the smallest value in a given column

MAX() returns the maximum value in a given column.

SUM() returns the sum of the numeric values in a given column

AVG() returns the average value of a given column

COUNT() returns the total number of values in a given column

COUNT(*) returns the number of rows in a table

SQL script examples about using aggregate functions:

Let's say we need to find the sale orders whose total sale is greater than $950. We combine the HAVING clause and the GROUP BY clause to accomplish this:

SELECT 
    orderId, SUM(unitPrice * qty) Total
FROM
    OrderDetails
GROUP BY orderId
HAVING Total > 950;

Counting all orders and grouping them customerID and sorting the result ascendant. We combine the COUNT function and the GROUP BY, ORDER BY clauses and ASC:

SELECT 
    customerId, COUNT(*)
FROM
    Orders
GROUP BY customerId
ORDER BY COUNT(*) ASC;

Retrieve the category that has an average Unit Price greater than $10, using AVG function combine with GROUP BY and HAVING clauses:

SELECT 
    categoryName, AVG(unitPrice)
FROM
    Products p
INNER JOIN
    Categories c ON c.categoryId = p.categoryId
GROUP BY categoryName
HAVING AVG(unitPrice) > 10;

Getting the less expensive product by each category, using the MIN function in a subquery:

SELECT categoryId,
       productId,
       productName,
       unitPrice
FROM Products p1
WHERE unitPrice = (
                SELECT MIN(unitPrice)
                FROM Products p2
                WHERE p2.categoryId = p1.categoryId)

The following statement groups rows with the same values in both categoryId and productId columns:

SELECT 
    categoryId, categoryName, productId, SUM(unitPrice)
FROM
    Products p
INNER JOIN
    Categories c ON c.categoryId = p.categoryId
GROUP BY categoryId, productId

Using Environment Variables with Vue.js

For those using Vue CLI 3 and the webpack-simple install, Aaron's answer did work for me however I wasn't keen on adding my environment variables to my webpack.config.js as I wanted to commit it to GitHub. Instead I installed the dotenv-webpack plugin and this appears to load environment variables fine from a .env file at the root of the project without the need to prepend VUE_APP_ to the environment variables.

What is the best way to give a C# auto-property an initial value?

In C# 6.0 this is a breeze!

You can do it in the Class declaration itself, in the property declaration statements.

public class Coordinate
{ 
    public int X { get; set; } = 34; // get or set auto-property with initializer

    public int Y { get; } = 89;      // read-only auto-property with initializer

    public int Z { get; }            // read-only auto-property with no initializer
                                     // so it has to be initialized from constructor    

    public Coordinate()              // .ctor()
    {
        Z = 42;
    }
}

jQuery Ajax PUT with parameters

Use:

$.ajax({
    url: 'feed/4', type: 'POST', data: "_METHOD=PUT&accessToken=63ce0fde", success: function(data) {
        console.log(data);
    }
});

Always remember to use _METHOD=PUT.

CSS root directory

In the CSS all you have to do is put url(logical path to the image file)

text-align: right on <select> or <option>

The following CSS will right-align both the arrow and the options:

_x000D_
_x000D_
select { text-align-last: right; }_x000D_
option { direction: rtl; }
_x000D_
<!-- example usage -->_x000D_
Choose one: <select>_x000D_
  <option>The first option</option>_x000D_
  <option>A second, fairly long option</option>_x000D_
  <option>Last</option>_x000D_
</select>
_x000D_
_x000D_
_x000D_

java comparator, how to sort by integer?

From Java 8 you can use :

Comparator.comparingInt(Dog::getDogAge).reversed();

What is the difference between PUT, POST and PATCH?

Quite logical the difference between PUT & PATCH w.r.t sending full & partial data for replacing/updating respectively. However, just couple of points as below

  1. Sometimes POST is considered as for updates w.r.t PUT for create
  2. Does HTTP mandates/checks for sending full vs partial data in PATCH? Otherwise, PATCH may be quite same as update as in PUT/POST

Programmatically navigate to another view controller/scene

If you are building UI without drag and drop (without using storyboard) and want to navigate default page or ViewController.swift to another page? Follow these steps 1) add a class (.swift) 2) Import UIKit 3) Declare class name like

class DemoNavigationClass :UIViewController{
     override func viewDidLoad(){
         let lbl_Hello = UILabel(frame: CGRect(x:self.view.frame.width/3, y:self.view.frame.height/2, 200, 30));
lbl_Hello.text = "You are on Next Page"
lbl_Hello.textColor = UIColor.white
self.view.addSubview(lbl_Hello)
    }
}

after creating second page come back to first page (ViewController.swift) Here make a button in viewDidLoad method

let button = UIButton()
button.frame = (frame: CGRect(x: self.view.frame.width/3, y: self.view.frame.height/1.5,   width: 200, height: 50))
 button.backgroundColor = UIColor.red
 button.setTitle("Go to Next ", for: .normal)
 button.addTarget(self, action: #selector(buttonAction), for: .touchUpInside)
 self.view.addSubview(button)

now define buttonAction method outside of viewDidLoad() in same class

func buttonAction(sender: UIButton!) 
{
    let obj : DemoNavigationClass = DemoNavigationClass();
    self.navigationController?.pushViewController(obj, animated: true)
}

Keep one thing that i forget in main.storyboard there is a scene with a arrow, select that arrow and press delete button

now drag and drop a navigationcontroller and delete tableview which comes with navaigation controller. select navigationcontroller press control on keyboard and drag it in to another scene on storyboard that is ViewController. This mean that your viewcontroller become root viewcontroller hope this help you Thanks in main.storyboard , drag and drop navigationcontroller,

Complex numbers usage in python

The following example for complex numbers should be self explanatory including the error message at the end

>>> x=complex(1,2)
>>> print x
(1+2j)
>>> y=complex(3,4)
>>> print y
(3+4j)
>>> z=x+y
>>> print x
(1+2j)
>>> print z
(4+6j)
>>> z=x*y
>>> print z
(-5+10j)
>>> z=x/y
>>> print z
(0.44+0.08j)
>>> print x.conjugate()
(1-2j)
>>> print x.imag
2.0
>>> print x.real
1.0
>>> print x>y

Traceback (most recent call last):
  File "<pyshell#149>", line 1, in <module>
    print x>y
TypeError: no ordering relation is defined for complex numbers
>>> print x==y
False
>>> 

Why do we need the "finally" clause in Python?

Run these Python3 codes to watch the need of finally:

CASE1:

count = 0
while True:
    count += 1
    if count > 3:
        break
    else:
        try:
            x = int(input("Enter your lock number here: "))

            if x == 586:
                print("Your lock has unlocked :)")

                break
            else:
                print("Try again!!")

                continue

        except:
            print("Invalid entry!!")
        finally:
            print("Your Attempts: {}".format(count))

CASE2:

count = 0

while True:
    count += 1
    if count > 3:
        break
    else:
        try:
            x = int(input("Enter your lock number here: "))

            if x == 586:
                print("Your lock has unlocked :)")

                break
            else:
                print("Try again!!")

                continue

        except:
            print("Invalid entry!!")

        print("Your Attempts: {}".format(count))

Try the following inputs each time:

  1. random integers
  2. correct code which is 586(Try this and you will get your answer)
  3. random strings

** At a very early stage of learning Python.

Java path..Error of jvm.cfg

Java mysteriously broke on my work PC after a security patch was pushed out to us, giving this error whenever you tried to run a Java program. Somehow the 'lib' subdirectory of the Java 7 install had vanished! It might have been related to having multiple Java versions installed simultaneously.

If you're getting this error there are basically two things that could be wrong:

1) Your Java installation is broken. If the file/directory it's complaining about doesn't exist, uninstall and reinstall the JRE and then it should be there. This fixed it for me.

2) If the files are there, your PATH is somehow incorrect or pointing at an old/broken Java install. In this case you either need to fix your PATH to point to the correct java.exe/javaw.exe, or use a fully qualified path. So instead of:

java <whatever>

Use

c:\<full path to correct JRE>\bin\java.exe <whatever>

3) If your PATH is correct and files are there and it's still failing, the path could be getting truncated because it is too long. see: Running Java gives "Error: could not open `C:\Program Files\Java\jre6\lib\amd64\jvm.cfg'" .

Generating a random hex color code with PHP

function random_color(){  
 return sprintf('#%06X', mt_rand(0, 0xFFFFFF));
}

Check if Cell value exists in Column, and then get the value of the NEXT Cell

How about this?

=IF(ISERROR(MATCH(A1,B:B, 0)), "No Match", INDIRECT(ADDRESS(MATCH(A1,B:B, 0), 3)))

The "3" at the end means for column C.

'cl' is not recognized as an internal or external command,

I had the same problem. Try to make a bat-file to start the Qt Creator. Add something like this to the bat-file:

call "C:\Program Files\Microsoft Visual Studio 9.0\VC\bin\vcvars32.bat"  
"C:\QTsdk\qtcreator\bin\qtcreator" 

Now I can compile and get:

jom 1.0.8 - empower your cores
11:10:08: The process "C:\QTsdk\qtcreator\bin\jom.exe" exited normally.

How to convert an array into an object using stdClass()

Array to stdClass can be done in php this way. (stdClass is already PHP's generic empty class)

$a = stdClass:: __set_state(array());

Actually calling stdClass::__set_state() in PHP 5 will produce a fatal error. thanks @Ozzy for pointing out

This is an example of how you can use __set_state() with a stdClass object in PHP5

class stdClassHelper{

    public static function __set_state(array $array){
        $stdClass = new stdClass();
        foreach ($array as $key => $value){
           $stdClass->$key = $value;
        }
        return $stdClass;
    }
}

$newstd = stdClassHelper::__set_state(array());

Or a nicer way.

$a = (object) array();

How to write to error log file in PHP

You can use normal file operation to create an error log. Just refer this and input this link: PHP File Handling

How to preserve insertion order in HashMap?

LinkedHashMap is precisely what you're looking for.

It is exactly like HashMap, except that when you iterate over it, it presents the items in the insertion order.

Finding multiple occurrences of a string within a string in Python

For your list example:

In [1]: x = ['ll','ok','ll']

In [2]: for idx, value in enumerate(x):
   ...:     if value == 'll':
   ...:         print idx, value       
0 ll
2 ll

If you wanted all the items in a list that contained 'll', you could also do that.

In [3]: x = ['Allowed','Hello','World','Hollow']

In [4]: for idx, value in enumerate(x):
   ...:     if 'll' in value:
   ...:         print idx, value
   ...:         
   ...:         
0 Allowed
1 Hello
3 Hollow

Bootstrap - dropdown menu not working?

I had a similar problem. The version of bootstrap.js that visual studio seems to be hosed. I just pointed to this URL instead:

    <link id="active_style" rel="stylesheet" href="//netdna.bootstrapcdn.com/bootswatch/3.1.1/cosmo/bootstrap.min.css">

For completeness, here's the HTML and javascript

<ul class="nav navbar-nav navbar-right">
                    <li id="theme_selector" class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown">Theme <b class="caret"></b></a>
                        <ul id="theme" class="dropdown-menu" role="menu">
                            <li><a href="#">Amelia</a></li>
                            <li><a href="#">Cerulean</a></li>
                            <li><a href="#">Cyborg</a></li>
                            <li><a href="#">Cosmo</a></li>
                            <li><a href="#">Darkly</a></li>
                            <li><a href="#">Flatly</a></li>
                            <li><a href="#">Lumen</a></li>
                            <li><a href="#">Simplex</a></li>
                            <li><a href="#">Slate</a></li>
                            <li><a href="#">Spacelab</a></li>
                            <li><a href="#">Superhero</a></li>
                            <li><a href="#">United</a></li>
                            <li><a href="#">Yeti</a></li>
                        </ul>
                    </li>
                </ul>

Javascript

$('#theme li').click(function () {
        //alert('item: ' + $(this).text());
        switch_style($(this).text());
    });

Hope it helps someone

Conditional operator in Python?

simple is the best and works in every version.

if a>10: 
    value="b"
else: 
    value="c"

How to extract public key using OpenSSL?

If your looking how to copy an Amazon AWS .pem keypair into a different region do the following:

openssl rsa -in .ssh/amazon-aws.pem -pubout > .ssh/amazon-aws.pub

Then

aws ec2 import-key-pair --key-name amazon-aws --public-key-material '$(cat .ssh/amazon-aws.pub)' --region us-west-2

What is the easiest way to parse an INI File in C++?

Unless you plan on making the app cross-platform, using the Windows API calls would be the best way to go. Just ignore the note in the API documentation about being provided only for 16-bit app compatibility.