Tutorial Make jQuery :contains Case-Insensitive

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// NEW selector
jQuery.expr[':'].Contains = function(a, i, m) {
  return jQuery(a).text().toUpperCase()
      .indexOf(m[3].toUpperCase()) >= 0;
};

// OVERWRITES old selecor
jQuery.expr[':'].contains = function(a, i, m) {
  return jQuery(a).text().toUpperCase()
      .indexOf(m[3].toUpperCase()) >= 0;
};

Update to work for jQuery 1.8

$.expr[":"].contains = $.expr.createPseudo(function(arg) {
    return function( elem ) {
        return $(elem).text().toUpperCase().indexOf(arg.toUpperCase()) >= 0;
    };
});

With this in place, 

$("div:contains('John')")

would select all three of these elements:

<div>john</div>
<div>John</div>
<div>hey hey JOHN hey hey</div>

Demo via Pablo Fortes.

Tutorial Make Entire Div Clickable

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$(".myBox").click(function(){
     window.location=$(this).find("a").attr("href"); 
     return false;
});

Looks for a link inside div with class of "myBox". Redirects to that links value when anywhere in div is clicked.

Reference HTML:

<div class="myBox">
     blah blah blah.
    <a href="http://google.com">link</a>
</div>

Tutorial Loading jQuery

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Load with Google API

<script src="http://www.google.com/jsapi" type="text/javascript"></script>
<script type="text/javascript">
    google.load("jquery", "1.2.6");
</script>
<script type="text/javascript" src="js/example.js"></script>

Direct Link to Google

<script type='text/javascript' src='http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js?ver=1.3.2'></script>

Check if loaded, only load if unloaded

var jQueryScriptOutputted = false;
function initJQuery() {

   //if the jQuery object isn't available
   if (typeof(jQuery) == 'undefined') {


       if (! jQueryScriptOutputted) {
           //only output the script once..
           jQueryScriptOutputted = true;

           //output the script (load it from google api)
           document.write("<scr" + "ipt type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></scr" + "ipt>");
       }
       setTimeout("initJQuery()", 50);
   } else {

       $(function() {
           //do anything that needs to be done on document.ready
       });
   }

}

Reference URL

Tutorial Load Only a Section of a Page

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Use Case

You want to AJAX load a section of another page on your site onto the current page. Say your eCommerce CMS system creates a dynamic menu of products, but that exists as a subdirectory of your site and you want to use that on the homepage.

jQuery

$("#mainNav").load("/store #mainNav")

The first param is the URL (only works for same-domain requests!) and the second (well, technically it's still part of the first, separated by a space) is a jQuery selector of the part to load. Not passing the second selector param will load the entire page. There is an optional third parameter, a callback function, which will run when the load is complete.

Reference URL

Tutorial Load jQuery Only If Not Present

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Say you were going to do an include on a whole bunch of pages, and inside of that include you wanted to do some jQuery specific stuff. That page may or may not already have jQuery loaded. If it already does, you don't want to load it again, but if not, you do. This works for that.

Smart Asynchronous Way

// Only do anything if jQuery isn't defined
if (typeof jQuery == 'undefined') {

	if (typeof $ == 'function') {
		// warning, global var
		thisPageUsingOtherJSLibrary = true;
	}
	
	function getScript(url, success) {
	
		var script     = document.createElement('script');
		     script.src = url;
		
		var head = document.getElementsByTagName('head')[0],
		done = false;
		
		// Attach handlers for all browsers
		script.onload = script.onreadystatechange = function() {
		
			if (!done && (!this.readyState || this.readyState == 'loaded' || this.readyState == 'complete')) {
			
			done = true;
				
				// callback function provided as param
				success();
				
				script.onload = script.onreadystatechange = null;
				head.removeChild(script);
				
			};
		
		};
		
		head.appendChild(script);
	
	};
	
	getScript('http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js', function() {
	
		if (typeof jQuery=='undefined') {
		
			// Super failsafe - still somehow failed...
		
		} else {
		
			// jQuery loaded! Make sure to use .noConflict just in case
			fancyCode();
			
			if (thisPageUsingOtherJSLibrary) {

				// Run your jQuery Code

			} else {

				// Use .noConflict(), then run your jQuery Code

			}
		
		}
	
	});
	
} else { // jQuery was already loaded
	
	// Run your jQuery Code

};

Notice how there is multiple places the jQuery code you intend to run get's called. Don't repeat yourself there, put it in a function you can call to kick things off.

This code was adapted from here.

Document.write way

Hip kids don't use document.write, but if you are too old to care:

var jQueryScriptOutputted = false;
function initJQuery() {
    
    //if the jQuery object isn't available
    if (typeof(jQuery) == 'undefined') {
    
        if (! jQueryScriptOutputted) {
            //only output the script once..
            jQueryScriptOutputted = true;
            
            //output the script (load it from google api)
            document.write("<scr" + "ipt type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></scr" + "ipt>");
        }
        setTimeout("initJQuery()", 50);
    } else {
                        
        $(function() {  
            // do anything that needs to be done on document.ready
            // don't really need this dom ready thing if used in footer
        });
    }
            
}
initJQuery();

Tutorial Link Nudging

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$("a").hover(function() {
       $(this).stop().animate({paddingLeft : "10px"},200);
},function() {
       $(this).stop().animate({paddingLeft : "0px"},200);
});

Make sure to change the selector to only target the links you want to have nudging, e.g. "#sidebar ul li a"

Tutorial Konami Code

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var kkeys = [], konami = "38,38,40,40,37,39,37,39,66,65";

$(document).keydown(function(e) {

  kkeys.push( e.keyCode );

  if ( kkeys.toString().indexOf( konami ) >= 0 ) {

    $(document).unbind('keydown',arguments.callee);
    
    // do something awesome
    $("body").addClass("konami");
  
  }

});