It&#39;s useful if you want to make text unselectable. If, for instance, you want to make drag-and-drop elements with text on, it&#39;d be annoying to the user if the text on the box accidentally would get selected when trying to drag the box.

Caveat emptor: `.disableSelection()` is actually harmful on some browsers, as it prevents clicking active elements (e.g. `textarea`s) inside the sortable.

 - Firefox 33.1 for Mac OS X (Yosemite): `.disableSelection()` prevents clicking on embedded `textarea`; doesn&#39;t seem to have any effect otherwise (i.e. it is still impossible to select text with the mouse in the sortable if omitted)
 - Chrome 39.0.2171.71 (64-bit) for Mac OS X: `.disableSelection()` seems to have no effect whatsoever.


jQuery documentation says to not use it http://api.jqueryui.com/disableselection/

Also, I found that it made elements with `contenteditable=&quot;true&quot;` no longer editable. 

I have a sorted list, let say: (its not really just numbers, its a list of objects that are sorted with a complicated time consuming algorithm)

    mylist = [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ,9  , 10 ]

Is there some python function that will give me N of the items, but will keep the order?

Example:

    randomList = getRandom(mylist,4)
    # randomList = [ 3 , 6 ,7 , 9 ]
    randomList = getRandom(mylist,4)
    # randomList = [ 1 , 2 , 4 , 8 ]

etc...

Get random sample from list while maintaining ordering of items?

I wrote a piece of code that will give the user a prompt asking them to press back again if they would like to exit. I currently have my code working to an extent but I know it is written poorly and I assume there is a better way to do it. Any suggestions would be helpful!

Code:

	public void onBackPressed(){
		backpress = (backpress + 1);
		Toast.makeText(getApplicationContext(), &quot; Press Back again to Exit &quot;, Toast.LENGTH_SHORT).show();
		
		if (backpress&gt;1) {
			this.finish();
		}
	}

Android: Proper Way to use onBackPressed() with Toast

Can someone help me understand why is this useful and when to use it?

    $( &quot;#sortable&quot; ).disableSelection();

What is disableSelection used for in jQuery UI?

Can someone help me understand why is this useful and when to use it?
<pre><code class="hljs language-javascript">$( "#sortable" ).disableSelection();
</code></pre>

I disable the button like this on my jQuery Mobile webpage:

    $(document).ready(function() {
        $(&quot;#deliveryNext&quot;).button();
        $(&quot;#deliveryNext&quot;).button(&#39;disable&#39;);
    });

and i can enable it with

    $(&quot;#deliveryNext&quot;).button(&#39;enable&#39;);

But how do i check if the button is disabled or enabled? 

This command gives &quot;undefined&quot;:

    $(&quot;#deliveryNext&quot;).attr(&#39;disabled&#39;)

Some ideas?

Edit: i find out that $(&quot;#deliveryNext&quot;).button(&#39;disable&#39;) only seams to change the style on the button, the clicking works fine after so i need to disable the button some how also.. i tried .attr(&#39;disabled&#39;, &#39;disabled&#39;) but when i then test .attr(&#39;disabled&#39;) i get undefined... 

Edit2: more about my &quot;real&quot; problem at https://stackoverflow.com/questions/6438659/how-to-disable-a-link-button-in-jquery-mobile

jQuery Mobile how to check if button is disabled?

&gt; **Possible Duplicate:**  
&gt; [Validate numbers in JavaScript - IsNumeric()](https://stackoverflow.com/questions/18082/validate-numbers-in-javascript-isnumeric)  

&lt;!-- End of automatically inserted text --&gt;

    var miscCharge = $(&quot;#miscCharge&quot;).val();

I want to check `misCharge` is number or not. Is there any method or easy way in jQuery or JavaScript to do this?

HTMl is 

    &lt;g:textField name=&quot;miscCharge&quot;  id =&quot;miscCharge&quot; value=&quot;&quot; size=&quot;9&quot; max=&quot;100000000000&quot; min=&quot;0&quot; /&gt;


Check whether a value is a number in JavaScript or jQuery

I have an XPath selector. How can I get the elements matching that selector using jQuery?

I&#39;ve seen https://developer.mozilla.org/en/Introduction_to_using_XPath_in_JavaScript but it doesn&#39;t use jQuery, and it seems a little too verbose, and I suppose it&#39;s not cross-browser.

Also, this http://jsfiddle.net/CJRmk/ doesn&#39;t seem to work.

&lt;!-- begin snippet: js hide: false console: true babel: false --&gt;

&lt;!-- language: lang-js --&gt;

    alert($(&quot;//a&quot;).length);

&lt;!-- language: lang-html --&gt;

    &lt;script src=&quot;https://ajax.googleapis.com/ajax/libs/jquery/1.6.0/jquery.min.js&quot;&gt;&lt;/script&gt;
    &lt;a href=&quot;a1.php&quot;&gt;&lt;/a&gt;
    &lt;a href=&quot;a2.php&quot;&gt;&lt;/a&gt;

&lt;!-- end snippet --&gt;



jQuery select element by XPath

I have a select box with some values. How do I get the selected options text, not the value?

    &lt;select name=&quot;options[2]&quot; id=&quot;select_2&quot;&gt;
        &lt;option value=&quot;&quot;&gt;-- Please Select --&lt;/option&gt;
        &lt;option value=&quot;6&quot; price=&quot;0&quot;&gt;100&lt;/option&gt;
        &lt;option value=&quot;7&quot; price=&quot;0&quot;&gt;125&lt;/option&gt;
        &lt;option value=&quot;8&quot; price=&quot;0&quot;&gt;150&lt;/option&gt;
        &lt;option value=&quot;9&quot; price=&quot;0&quot;&gt;175&lt;/option&gt;
        &lt;option value=&quot;10&quot; price=&quot;0&quot;&gt;200&lt;/option&gt;
        &lt;option value=&quot;3&quot; price=&quot;0&quot;&gt;25&lt;/option&gt;
        &lt;option value=&quot;4&quot; price=&quot;0&quot;&gt;50&lt;/option&gt;
        &lt;option value=&quot;5&quot; price=&quot;0&quot;&gt;75&lt;/option&gt;
    &lt;/select&gt;

I tried this:

    $j(document).ready(function(){
		$j(&quot;select#select_2&quot;).change(function(){
			val = $j(&quot;select#select_2:selected&quot;).text();
			alert(val);
		});
    });

But it&#39;s coming back with `undefined`.

Get text of the selected option with jQuery

When using jquery `.change` on an `input` the event will only be fired when the input loses focus

In my case, I need to make a call to the service (check if value is valid) as soon as the input value is changed. How could I accomplish this?

Detecting input change in jQuery?

How do you trigger jQuery UI&#39;s AutoComplete change event handler programmatically?

**Hookup**
 

    $(&quot;#CompanyList&quot;).autocomplete({ 
    	source: context.companies, 
    	change: handleCompanyChanged 
    });


**Misc Attempts Thus Far**

    $(&quot;#CompanyList&quot;).change();
    $(&quot;#CompanyList&quot;).trigger(&quot;change&quot;);
    $(&quot;#CompanyList&quot;).triggerHandler(&quot;change&quot;);

Based on other answers it **should** work:

https://stackoverflow.com/questions/4247264/how-to-trigger-jquery-change-event-in-code

https://stackoverflow.com/questions/5005964/jquery-autocomplete-and-on-change-problem

https://stackoverflow.com/questions/4070848/jquery-autocomplete-help


The change event fires as expected when I manually interact with the AutoComplete input via browser; however I would like to programmatically trigger the change event in some cases. 

What am I missing? 



jQuery AutoComplete Trigger Change Event

I&#39;m trying to use KnockoutJS with jQuery UI. I have an input element with a datepicker attached. I&#39;m currently running `knockout.debug.1.2.1.js` and it seems that the change event is never being caught by Knockout. The element looks like this:

&lt;!-- language: lang-html --&gt;

    &lt;input type=&quot;text&quot; class=&quot;date&quot; data-bind=&quot;value: RedemptionExpiration&quot;/&gt;

I&#39;ve even tried changing the `valueUpdate` event type but to no avail. It seems like Chrome causes a `focus` event just before it changes the value, but IE doesn&#39;t.

Is there some Knockout method that &quot;rebinds all the bindings&quot;? I technically only need the value changed before I send it back to the server. So I could live with that kind of workaround.

I think the problem&#39;s the datepicker&#39;s fault, but I can&#39;t figure out how to fix this.

Any ideas?

jQuery UI datepicker change event not caught by KnockoutJS

I&#39;m new to web development and there are just too many j* stuff out there. I wonder what are the differences between these frameworks? 

Moreover, why do people talk a lot about making a plugin using jQuery? Isn&#39;t it supposed to be a JavaScript library to make your web page more interactive?

jQuery vs jQuery Mobile vs jQuery UI?

I found this answer on another thread..

https://stackoverflow.com/questions/2512463/how-to-add-multiple-buttons-in-jquery-ui-dialog-box

Using this syntax, how do you add class to a particular button?

     $(&quot;#mydialog&quot;).dialog({
          buttons: {
            &#39;Confirm&#39;: function() {
               //do something
               $(this).dialog(&#39;close&#39;);
            },
            &#39;Cancel&#39;: function() {
               $(this).dialog(&#39;close&#39;);
            }
          }
        });



Content Type	Original Author	Original Content on Stackoverflow
Question	Nikola	View Question on Stackoverflow
Solution 1 - Jquery	kba	View Answer on Stackoverflow
Solution 2 - Jquery	DomQ	View Answer on Stackoverflow
Solution 3 - Jquery	Shane Rowatt	View Answer on Stackoverflow

What is disableSelection used for in jQuery UI?

Jquery Problem Overview

Jquery Solutions

Solution 1 - Jquery

Solution 2 - Jquery

Solution 3 - Jquery

Android: Proper Way to use onBackPressed() with Toast

Get random sample from list while maintaining ordering of items?

Attributions