Toggle checkboxes with jQuery and Prototype JS

Sometimes you work with forms having a long list of checkboxes, in such scenarios a “Check All” or “Toggle Selection” button comes handy. Such button can save your time by toggling your selection with one click.
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nl2br equivalent JavaScript function

PHP provides a useful function nl2br that inserts HTML line breaks before all newlines \n in a string. Many times we want to utilize this functionality in JavaScript, although there is no nl2br  equivalent JavaScript function but we can create a custom function using regular expressions. Below is JavaScript equivalent for nl2br.

function nl2br(str, is_xhtml) {
	var breakTag = (is_xhtml || typeof is_xhtml === 'undefined') ? '<br />'	: '<br>';
	return (str + '').replace(/([^>\r\n]?)(\r\n|\n\r|\r|\n)/g, '$1' + breakTag	+ '$2');

mouseover with delay (using hoverIntent plugin)

hoverIntent is a plug-in that attempts to determine the user’s intent… like a crystal ball, only with mouse movement! It works like (and was derived from) jQuery’s built-in hover. However, instead of immediately calling the onMouseOver function, it waits until the user’s mouse slows down enough before making the call.
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Trigger Google conversion on some event

Normally Google conversion code is added in header or footer of the “Thank you for your purchase” pages. A conversion is logged when someone lands on such thank you pages. But what if you want to notify Google about a conversion when a certain event is triggered like Sigup, Buy Now or Register button is clicked.
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Post to your Facebook wall using Javascript SDK


&lt;div id=&quot;fb_div&quot;&gt;
    &lt;h3&gt;Post to your Facebook wall:&lt;/h3&gt; &lt;br /&gt;
    &lt;textarea id=&quot;fb_message&quot; name=&quot;fb_message&quot; cols=&quot;70&quot; rows=&quot;7&quot;&gt;&lt;/textarea&gt; &lt;br /&gt;
    &lt;input type=&quot;button&quot; value=&quot;Post on Wall&quot; onClick=&quot;post_on_wall();&quot; /&gt;

Step 2:

window.fbAsyncInit = function()
        appId  : 'xxxxxxxxxxxxxxx',
        status : true, // check login status
        cookie : true, // enable cookies to allow the server to access the session
        xfbml  : true , // parse XFBML
        oauth : true // Enable oauth authentication


function post_on_wall()
        if (response.authResponse)
            alert('Logged in!');

            // Post message to your wall

            var opts = {
                message : document.getElementById('fb_message').value,
                name : 'Post Title',
                link : '',
                description : 'post description',
                picture : ';amp;d=mm&amp;amp;r=G'

            FB.api('/me/feed', 'post', opts, function(response)
                if (!response || response.error)
                    alert('Posting error occured');
                    alert('Success - Post ID: ' +;
            alert('Not logged in');
    }, { scope : 'publish_stream' });

create a div with id=”fb-root” and paste below code after this div

&lt;div id=&quot;fb-root&quot;&gt;&lt;/div&gt;


(function() {
    var e = document.createElement('script');
    // replacing with an older version until FB fixes the cancel-login bug
    e.src = document.location.protocol + '//';
    //e.src = 'scripts/all.js';
    e.async = true;

keyup function with delay


This code will execute a function after the user has stopped typing for a time of 1000ms. Hence the function will not be called on each keyup event. Great!!!

    var delay = (function(){
        var timer = 0;
        return function(callback, ms){
            clearTimeout (timer);
            timer = setTimeout(callback, ms);

    $('input').keyup(function() {
            alert('Time elapsed!');
        }, 1000 );