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How to declare a global variable in JavaScript?
...
With jQuery you can just do this, no matter where the declaration is:
$my_global_var = 'my value';
And will be available everywhere.
I use it for making quick image galleries, when images are spread in different places, like so:
$gallery = $('img');
$current = 0;
$gallery.each(function(i,v){
...
Display names of all constraints for a table in Oracle SQL
...
You need to query the data dictionary, specifically the USER_CONS_COLUMNS view to see the table columns and corresponding constraints:
SELECT *
FROM user_cons_columns
WHERE table_name = '<your table name>';
FYI, unless you specifically created your table with a lower case ...
How can I extract a good quality JPEG image from a video file with ffmpeg?
...n 2).
To output a series of images:
ffmpeg -i input.mp4 -qscale:v 2 output_%03d.jpg
See the image muxer documentation for more options involving image outputs.
To output a single image at ~60 seconds duration:
ffmpeg -ss 60 -i input.mp4 -qscale:v 4 -frames:v 1 output.jpg
This will work with any v...
How do I create a simple 'Hello World' module in Magento?
...les named as follows
cd /path/to/store/app
touch etc/modules/MyCompanyName_HelloWorld.xml
<?xml version="1.0"?>
<config>
<modules>
<MyCompanyName_HelloWorld>
<active>true</active>
<codePool>local</codePool>
...
How to destroy an object?
...way.
You will need to figure out which is best for you. Also you can use __destruct() for an object which will be called on unset or null but it should be used carefully and like others said, never be called directly!
see:
http://www.stoimen.com/blog/2011/11/14/php-dont-call-the-destructor-expl...
how do I make a single legend for many subplots with matplotlib?
...
There is also a nice function get_legend_handles_labels() you can call on the last axis (if you iterate over them) that would collect everything you need from label= arguments:
handles, labels = ax.get_legend_handles_labels()
fig.legend(handles, labels, loc...
How to get Url Hash (#) from server side
...xample.com/yourDirectory/index.php:
function redirect()
{
if (!empty($_GET['hash'])) {
/** Sanitize & Validate $_GET['hash']
If valid return string
If invalid: return empty or false
******************************************************/
...
How to git-cherry-pick only changes to certain files?
...st other methods I have come across.
In principle:
git checkout <other_branch_name> <files/to/grab in/list/separated/by/spaces> -p
example:
git checkout mybranch config/important.yml app/models/important.rb -p
You then get a dialog asking you which changes you want in "blobs" this...
Match whitespace but not newlines
...usr/bin/env perl
use strict;
use warnings;
use 5.005; # for qr//
my $ws_not_crlf = qr/[^\S\r\n]/;
for (' ', '\f', '\t', '\r', '\n') {
my $qq = qq["$_"];
printf "%-4s => %s\n", $qq,
(eval $qq) =~ $ws_not_crlf ? "match" : "no match";
}
Output:
" " => match
"\f" => match
"\t" ...
How to get subarray from array?
...
What K_7 said; most especially, monkey-patching the Builtins (Object, Array, Promise, etc) is very naughty. See the famous example of MooTools forcing a rename of the proposed native Array.prototype.contains to Array.prototype.incl...