Tutorial Shuffle DOM Elements

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This is from James Padolsey. Check out his article for a pure JavaScript technique as well.

Plugin

(function($){
 
    $.fn.shuffle = function() {
 
        var allElems = this.get(),
            getRandom = function(max) {
                return Math.floor(Math.random() * max);
            },
            shuffled = $.map(allElems, function(){
                var random = getRandom(allElems.length),
                    randEl = $(allElems[random]).clone(true)[0];
                allElems.splice(random, 1);
                return randEl;
           });
 
        this.each(function(i){
            $(this).replaceWith($(shuffled[i]));
        });
 
        return $(shuffled);
 
    };
 
})(jQuery);

Usage

Target elements, call shuffle.

$('ul#list li').shuffle();

Tutorial Shuffle Children

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Nice clean version of a ghetto one that I wrote. 

$.fn.shuffleChildren = function() {
    $.each(this.get(), function(index, el) {
        var $el = $(el);
        var $find = $el.children();

        $find.sort(function() {
            return 0.5 - Math.random();
        });

        $el.empty();
        $find.appendTo($el);
    });
};

Usage

$(".parent-element").shuffleChildren();

View Demo

Tutorial Show Most Recent Picasaweb Uploads

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Replace the "tester" username below with your own, and the target value with the selector of the element you wish to append the pictures to.

$(document).ready(function() {
	$.getJSON("http://picasaweb.google.com/data/feed/base/user/tester/?kind=photo&access=public&alt=json&callback=?",
	function(data) {
		var target = "#latest-picasaweb-images ul"; // Where is it going?
		for (i = 0; i <= 9; i = i + 1) { // Loop through the 10 most recent, [0-9]
			var pic = data.feed.entry[i].media$group;
			var liNumber = i + 1; // Add class to each LI (1-10)
			var thumbSize = 0; // Size of thumbnail - 0=small 1=medium 2=large
			$(target).append("<li class='no-" + liNumber + "'><a title='" + pic.media$description.$t + "' href='" + pic.media$content[0].url + "'><img src='" + pic.media$thumbnail[thumbSize].url + "' /></a></li>");
		}
	});
});

Example

Reference URL

Tutorial Show Most Recent Flickr Uploads

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This code will display the most recent uploads from Flickr for any account. Replace the "35591378@N03" (the Whitehouse account) in the code below with the ID of the account you are fetching from. Use this if you need help finding it. Alter the "9" in the loop to show more or less than 10.

$(document).ready(function() {
       $.getJSON("http://api.flickr.com/services/feeds/photos_public.gne?id=35591378@N03&format=json&jsoncallback=?", function(data) {
               var target = "#latest-flickr-images ul"; // Where is it going?
               for (i = 0; i <= 9; i = i + 1) { // Loop through the 10 most recent, [0-9]
                       var pic = data.items[i];
                       var liNumber = i + 1; // Add class to each LI (1-10)
                       $(target).append("<li class='flickr-image no-" + liNumber + "'><a title='" + pic.title + "' href='" + pic.link + "'><img src='" + pic.media.m + "' /></a></li>");
               }
       });
});

Example

Reference URL

Tutorial Set/Clear Default Input Value

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$('.default-value').each(function() {

       var default_value = this.value;

       $(this).focus(function(){
               if(this.value == default_value) {
                       this.value = '';
               }
       });

       $(this).blur(function(){
               if(this.value == '') {
                       this.value = default_value;
               }
       });

});

Tutorial Serialize Form to JSON

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$.fn.serializeObject = function()
{
   var o = {};
   var a = this.serializeArray();
   $.each(a, function() {
       if (o[this.name]) {
           if (!o[this.name].push) {
               o[this.name] = [o[this.name]];
           }
           o[this.name].push(this.value || '');
       } else {
           o[this.name] = this.value || '';
       }
   });
   return o;
};

Reference URL

Tutorial Select List Item Only If Doesn’t Contain Another List (and is top level)

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I realize this is rather specific, but I had to write this selector earlier to fix a problem and I used jQuery because the selector is rather advanced (and needed to work cross-browser). I needed to select the anchor link of a list item but only if that list item didn't contain another list and was at the top level of the nested list structure (no deeper).

$("ul.dropdown > li:not(:has('ul')) a").css({
        "background-image": "none",
});

The idea was that each of the top level links in the dropdown menu had a "down arrow" graphic, but the list items that did not have a dropdown should have that arrow removed.