David Walsh :: PHP, CSS, MooTools, jQuery, and Everything Else

Track Clicks Outside Active Elements with MooTools or jQuery

2010-03-18T16:38:53Z

Buried in the MooTools and jQuery code from my Twitter Dropdowns posts was a small but useful snippet of code: hide an “active” element when the user clicks outside of the elements.

Take a look at the image above. When you click the “Menu 1″ button, the dropdown menu displays. Both the buttons and dropdown are wrapped in a DIV. When the menu gets activated, that wrapping DIV (or “parent”) is stored in a variable. For each dropdown, we add an event to the body to check where the user clicks. The following snippet explains what happens next.

The MooTools Javascript

/*
- showingParent is the wrapper div.
- hideMenu hides the showingParent's dropdown, etc.
*/

/* hide when clicked outside */
$(document.body).addEvent('click',function(e) {
	if(showingParent && !e.target || !$(e.target).getParents().contains(showingParent)) { 
		hideMenu(); //hide the menu! clicked outside!
	}
});

The Event object (e, in this case), specifically Event.target, tells us which element was clicked. Once we know which element is clicked, we can step up the DOM tree, looking for the “parent” element we had saved. If we find the saved parent element, we know the click occurred inside the designated area and we do *not* close the active element. If we don’t find the saved parent, the user clicked outside the active element and we should close the menu.

The jQuery Javascript

$(document.body).bind('click',function(e) {
	if(showingParent) {
		var parentElement = showingParent[0];
		if(!$.contains(parentElement,e.target) || parentElement != e.target) {
			hideMenu();
		}
	}
});

The same principle applies; jQuery’s syntax is simply different.

If you still have questions about the context of its use, check out the MooTools or jQuery Twitter Dropdown articles to see this technique in practice. This ability is extremely effective and valuable when trying to create usable dropdowns. Have fun with this!

Don't forget to follow me on Twitter and be sure to visit Script & Style for the best Javascript and CSS articles around!Sponsor the David Walsh Blog and get your brand in front of several thousand users per day!

Track Clicks Outside Active Elements with MooTools or jQuery

Create a Quick MooTools Slideshow with Preloading Images

2010-03-17T13:21:28Z

I’ve been creating a lot of slideshow posts lately. Why, you ask? Because they help me get chicks. A quick formula for you:

var numChicks = $$('.slideshow').length; //simple!

The following code snippet will show you how to create a simple slideshow with MooTools; the script will also preload the images and feature a progress message. Why preload images? They make the slideshow more elegant and you can avoid an onLoad mess. Oh, and chicks…loads and loads of chicks.

View Demo

The HTML

<div id="slideshow-holder">
	<div id="progress"></div>
</div>

Basically just two DIVs which will hold content.

The CSS

#slideshow-holder	{ width:600px; height:400px; background:url(spinner.gif) center center no-repeat #fff; position:relative; }
#progress			{ position:absolute; width:100%; text-align:center; color:#999; top:225px; }

The image holder is given set dimensions, starts with a background spinner, and its position set to relative; the images will all be positioned absolutely. The progress holder is set right below the spinner.

The MooTools Javascript

window.addEvent('domready',function() {
	/* preloading */
	var imagesDir = 'epics/';
	var images = ['2.jpg','3.jpg','1.jpg','4.jpg','5.jpg'];
	var holder = $('slideshow-holder');
	images.each(function(img,i){ images[i] = imagesDir + '' + img; }); //add dir to images
	var progressTemplate = 'Loading image {x} of ' + images.length;
	var updateProgress = function(num) {
		progress.set('text',progressTemplate.replace('{x}',num));
	};
	var progress = $('progress');
	updateProgress('text','0');
	var loader = new Asset.images(images, {
		onProgress: function(c,index) {
			updateProgress('text',index + 1);
		},
		onComplete: function() {
			var slides = [];
			/* put images into page */
			images.each(function(im) {
				slides.push(new Element('img',{
					src:im,
					width: 600,
					height: 400,
					styles: {
						opacity:0,
						top:0,
						left:0,
						position:'absolute',
						'z-index': 10
					}
				}).inject(holder));
				holder.setStyle('background','url(logo.png) center 80px no-repeat');
			});
			var showInterval = 5000;
			var index = 0;
			progress.set('text','Images loaded.  MooTools FTW.');
			(function() {slides[index].tween('opacity',1); }).delay(1000);
			var start = function() {
				(function() {
					holder.setStyle('background','');
					slides[index].fade(0);
					++index;
					index = (slides[index] ? index : 0);
					slides[index].fade(1);
				}).periodical(showInterval);
			};

			/* start the show */
			start();
		}
	});
});

The first set of variable declarations represent basic settings for the preloader: images, preload-message-updating, etc. We pass our Asset.images instance an array of images. When each image loads, we update the status message. When every image has loaded, we remove the status message and start the slideshow. That’s it!

View Demo

Of course the above could be turned into the class….I’m just slightly lazy…Feel free to turn it into a class and share with everyone!

Don't forget to follow me on Twitter and be sure to visit Script & Style for the best Javascript and CSS articles around!Sponsor the David Walsh Blog and get your brand in front of several thousand users per day!

Create a Quick MooTools Slideshow with Preloading Images

Create Twitter-Style Dropdowns Using jQuery

2010-03-16T13:10:11Z

Twitter does some great stuff with javascript. What I really appreciate about what they do is that there aren’t any epic JS functionalities — they’re all simple touches. One of those simple touches is the “Login” dropdown on their homepage. I’ve taken some time to duplicate that functionality with jQuery.

View Demo

The HTML

<div id="menu1"><div class="relative">
	<a href="/demos" title="Popular MooTools Tutorials" id="dd1" class="dropdown" style="width:170px;text-decoration:none;"><span>Menu 1</span></a>
	<div id="dropdown1" class="dropdown-menu">
		<a href="/about-david-walsh" title="Learn a bit about me.">About Me</a>
		<a href="/page/1" title="The David Walsh Blog">Blog</a>
		<a href="/chat" title="#davidwalshblog IRC Chat">Chat</a>
		<a href="/contact" title="Contact David Walsh">Contact Me</a>
		<a href="/demos" title="CSS, PHP, jQuery, MooTools Demos">Demos &amp; Downloads</a>
		<a href="/js" title="ScrollSpy, Lazyload, Overlay, Context Menu">MooTools Plugins</a>
		<a href="/network" title="David Walsh Blog, Script &amp; Style, Band Website Template, Wynq">Network</a>
		<a href="/web-development-tools" title="JS, CSS Compression">Web Dev Tools</a>
	</div>
</div></div>

<div id="menu2"><div class="relative">
	<a href="/demos" title="Popular MooTools Tutorials" id="dd2" class="dropdown" rel="dropdown2" style="width:170px;text-decoration:none;"><span>Menu 2</span></a>
	<div id="dropdown2" class="dropdown-menu">
		<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
	</div>
</div></div>

A series of DIVS wrapping a link (the dropdown “trigger”) and a DIV containing the menu items.

The CSS

/* dropdowns: general */
a.dropdown { background: #88bbd4; padding: 4px 6px 6px; text-decoration: none; font-weight: bold; color: #fff; -webkit-border-radius: 4px; -moz-border-radius: 4px; border-radius: 4px; }
a.dropdown:hover { background: #59b; }
a.dropdown { position: relative; margin-left: 3px; }
a.dropdown span { background-image: url(toggle_down_light.png); background-repeat: no-repeat; background-position: 100% 50%; padding: 4px 16px 6px 0; }
a.dropdown.dropdown-active { color:#59b; background-color:#ddeef6; }
a.dropdown.dropdown-active span { background:url(toggle_up_dark.png) 100% 50% no-repeat; }
.dropdown-menu	{ background:#ddeef6; padding:7px 12px; position:absolute; top:16px; right:0; display:none; z-index:5000; -moz-border-radius-topleft: 5px; -moz-border-radius-bottomleft: 5px; -moz-border-radius-bottomright: 5px; -webkit-border-top-left-radius: 5px; -webkit-border-bottom-left-radius: 5px; -webkit-border-bottom-right-radius: 5px; }
	.dropdown-menu p { font-size:11px; }
.dropdown-menu a:link, .dropdown-menu a:visited	{ font-weight:bold; color:#59b; text-decoration:none; line-height:1.7em; }
.dropdown-menu a:active, .dropdown-menu a:hover { color:#555; }

			* html .dropdown-menu { top:28px; }
			*+ html .dropdown-menu { top:28px; }

/* dropdowns: specific */
#menu1			{ float:left; margin-right:20px; }
	#dropdown1	{ width:150px; }
	#dropdown1 a	{ display:block; }
#menu2			{ float:left; }
	#dropdown2	{ width:150px; font-size:11px; }
.relative		{ position:relative; }

There’s a lot of CSS involved but most of it is simple visual styling as opposed to styling for javascript’s sake. Do, however, note where relative and absolute positioning is used. The outermost DIV may be positioned absolutely if you’d like. Also note that I’m not doing anything to accommodate for rounded corners in IE — I recommend DD_Roundies for that.

The jQuery Javascript

$(document).ready(function() {
	/* for keeping track of what's "open" */
	var activeClass = 'dropdown-active', showingDropdown, showingMenu, showingParent;
	/* hides the current menu */
	var hideMenu = function() {
		if(showingDropdown) {
			showingDropdown.removeClass(activeClass);
			showingMenu.hide();
		}
	};
	
	/* recurse through dropdown menus */
	$('.dropdown').each(function() {
		/* track elements: menu, parent */
		var dropdown = $(this);
		var menu = dropdown.next('div.dropdown-menu'), parent = dropdown.parent();
		/* function that shows THIS menu */
		var showMenu = function() {
			hideMenu();
			showingDropdown = dropdown.addClass('dropdown-active');
			showingMenu = menu.show();
			showingParent = parent;
		};
		/* function to show menu when clicked */
		dropdown.bind('click',function(e) {
			if(e) e.stopPropagation();
			if(e) e.preventDefault();
			showMenu();
		});
		/* function to show menu when someone tabs to the box */
		dropdown.bind('focus',function() {
			showMenu();
		});
	});
	
	/* hide when clicked outside */
	$(document.body).bind('click',function(e) {
		if(showingParent) {
			var parentElement = showingParent[0];
			if(!$.contains(parentElement,e.target) || !parentElement == e.target) {
				hideMenu();
			}
		}
	});
});

I’ve commented to the code to illustrate what each block does. In a nutshell:

I create placeholder variables which will keep track of the current menu, dropdown, and parent for the opened menu. This functionality is only included because I don’t want more than one menu to be open at a time.
I create a function that hides the current menu — this can be used from anywhere within the closure.
I cycle through each dropdown and add events to relevant elements to show and hide menus.
I add an event to the body to close the current menu if the user clicks outside of the menu.

That’s it!

View Demo

Be sure to check out the MooTools version.

Book Review: MooTools 1.2 Beginner’s Guide

2010-03-12T03:49:53Z

In the interest in full disclosure, I was sent this book by Packt Publishing in hopes that I would review it. I’m reviewing this book, however, in the interest of my audience.

Unless you live under a rock or simply check my site for Christina Ricci pics every morning, you know I’m a bit of a MooTools fanboy. I spend hours every day writing MooTools tutorials, getting in touch with the MooTools community and development team members, and oh yeah…coding a bit too. When it was brought to my attention that Jacob Gube and Garrick Cheung had written a MooTools book for beginners, I was really excited to check it out. The following are my thoughts on their book.

The Authors

Jacob Gube, Garrick Cheung

The Tagline

Learn how to create dynamic, interactive, and responsive cross-browser web applications using this popular JavaScript framework.

Shooting From the Hip

Instead of giving you this super long review that you wont read, I’ve decided to put my thoughts into bullet format. How clever!

What I really love about this book is that it’s not a bunch of “theory” information — it’s no-nonsense, code-based learning. I LOVE these style of books.
The book is ~ 150 pages, which is about right for a beginner’s guide. Making it too long would be a huge mistake.
The price point is $40. Reasonable.
The book covers a large array of sample projects and code examples — you aren’t looking at the same code snippets everywhere. Awesome.
One gripe is that I don’t recall the book ever discussing the difference between MooTools and similar libraries like jQuery, Dojo, etc. MooTools’ object-oriented architecture and the idea of modifying native object prototypes is core to the framework and differentiates MooTools from other libraries. That really should be included in a “version 2″ book.
I was not included as a MooTools resource — clearly an oversight. Hahaha.
The book *does* cover creating a unique build of MooTools Core and -More. This is very important as beginners should know that MooTools is built to be incredibly modular and Moo programmers should code with that same idea in mind.
The book flows very well and the progression of difficulty is perfect. Beginners will really appreciate the pace of the book.
While Jacob isn’t a member of the team, he co-authored with contributor Garrick Cheung and asked Christoph Pojer, a MooTools Core Developer, to be technical reviewer. Involving people very close to the team was a great idea; it helps the book’s credibility and allows for all options to be considered. * I don’t mean to say this to discredit Jacob — he’s done a great job with this book and you certainly don’t need to be a team member/contributor to be a MooTools expert.
I know it’s Packt’s style, but the “Impact”-style heading fonts are ugly.
The book doesn’t try to explain or gloss over basic javascript. Thank you, thank you, thank you!

The Verdict

I was very impressed with this book and I believe it’s the perfect book for any developer looking to enter the MooTools pastures. My only major desire is that the book cover MooTools’ native object prototype modification; beside that oversight, I’d recommend this book to both rookie and novice MooTools developers. MooTools 1.2 Beginner’s Guide should be required reading for MooTools developers looking to master the basic of MooTools.

Create Twitter-Style Dropdowns Using MooTools

2010-03-11T14:05:57Z

View Demo

The HTML

<div id="menu1"><div class="relative">
	<a href="/demos" title="Popular MooTools Tutorials" id="dd1" class="dropdown" style="width:170px;text-decoration:none;"><span>Menu 1</span></a>
	<div id="dropdown1" class="dropdown-menu">
		<a href="/about-david-walsh" title="Learn a bit about me.">About Me</a>
		<a href="/page/1" title="The David Walsh Blog">Blog</a>
		<a href="/chat" title="#davidwalshblog IRC Chat">Chat</a>
		<a href="/contact" title="Contact David Walsh">Contact Me</a>
		<a href="/demos" title="CSS, PHP, jQuery, MooTools Demos">Demos &amp; Downloads</a>
		<a href="/js" title="ScrollSpy, Lazyload, Overlay, Context Menu">MooTools Plugins</a>
		<a href="/network" title="David Walsh Blog, Script &amp; Style, Band Website Template, Wynq">Network</a>
		<a href="/web-development-tools" title="JS, CSS Compression">Web Dev Tools</a>
	</div>
</div></div>

<div id="menu2"><div class="relative">
	<a href="/demos" title="Popular MooTools Tutorials" id="dd2" class="dropdown" rel="dropdown2" style="width:170px;text-decoration:none;"><span>Menu 2</span></a>
	<div id="dropdown2" class="dropdown-menu">
		<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>
	</div>
</div></div>

A series of DIVS wrapping a link (the dropdown “trigger”) and a DIV containing the menu items.

The CSS

/* dropdowns: general */
a.dropdown { background: #88bbd4; padding: 4px 6px 6px; text-decoration: none; font-weight: bold; color: #fff; -webkit-border-radius: 4px; -moz-border-radius: 4px; border-radius: 4px; }
a.dropdown:hover { background: #59b; }
a.dropdown { position: relative; margin-left: 3px; }
a.dropdown span { background-image: url(toggle_down_light.png); background-repeat: no-repeat; background-position: 100% 50%; padding: 4px 16px 6px 0; }
a.dropdown.dropdown-active { color:#59b; background-color:#ddeef6; }
a.dropdown.dropdown-active span { background:url(toggle_up_dark.png) 100% 50% no-repeat; }
.dropdown-menu	{ background:#ddeef6; padding:7px 12px; position:absolute; top:16px; right:0; display:none; z-index:5000; -moz-border-radius-topleft: 5px; -moz-border-radius-bottomleft: 5px; -moz-border-radius-bottomright: 5px; -webkit-border-top-left-radius: 5px; -webkit-border-bottom-left-radius: 5px; -webkit-border-bottom-right-radius: 5px; }
	.dropdown-menu p { font-size:11px; }
.dropdown-menu a:link, .dropdown-menu a:visited	{ font-weight:bold; color:#59b; text-decoration:none; line-height:1.7em; }
.dropdown-menu a:active, .dropdown-menu a:hover { color:#555; }

/* dropdowns: specific */
#menu1			{ float:left; margin-right:20px; }
	#dropdown1	{ width:150px; }
	#dropdown1 a	{ display:block; }
#menu2			{ float:left; }
	#dropdown2	{ width:150px; font-size:11px; }
.relative		{ position:relative; }

The MooTools Javascript

window.addEvent('domready',function() {
	(function($) {
		/* for keeping track of what's "open" */
		var activeClass = 'dropdown-active', showingDropdown, showingMenu, showingParent;
		/* hides the current menu */
		var hideMenu = function() {
			if(showingDropdown) {
				showingDropdown.removeClass(activeClass);
				showingMenu.setStyle('display','none');
			}
		};
		/* recurse through dropdown menus */
		$$('.dropdown').each(function(dropdown) {
			/* track elements: menu, parent */
			var menu = dropdown.getNext('div.dropdown-menu'), parent = dropdown.getParent('div');
			/* function that shows THIS menu */
			var showMenu = function() {
				hideMenu();
				showingDropdown = dropdown.addClass('dropdown-active');
				showingMenu = menu.setStyle('display','block');
				showingParent = parent;
			};
			/* function to show menu when clicked */
			dropdown.addEvent('click',function(e) {
				if(e) e.stop();
				showMenu();
			});
			/* function to show menu when someone tabs to the box */
			dropdown.addEvent('focus',function() {
				showMenu();
			});
		});
		/* hide when clicked outside */
		$(document.body).addEvent('click',function(e) {
			if(showingParent && !e.target || !$(e.target).getParents().contains(showingParent)) { 
				hideMenu();
			}
		});
	})(document.id);
});

I’ve commented to the code to illustrate what each block does. In a nutshell:

I create placeholder variables which will keep track of the current menu, dropdown, and parent for the opened menu. This functionality is only included because I don’t want more than one menu to be open at a time.
I create a function that hides the current menu — this can be used from anywhere within the closure.
I cycle through each dropdown and add events to relevant elements to show and hide menus.
I add an event to the body to close the current menu if the user clicks outside of the menu.

That’s it!

View Demo

Look forward to a MooTools Class version soon. Also look forward to jQuery and Dojo versions!

Introducing MooTools NextPrev

2010-03-10T14:04:46Z

One thing I love doing is duplicating OS functionalities. One of the things your OS allows you to do easily is move from one item to another. Most of the time you’re simply trying to get to the next or the previous item. MooTools NextPrev is a compact javascript class that allows you to move about a collection of items quickly using human terms.

View Demo

The MooTools Class

var NextPrev = new Class({
	Implements: [Options,Events],
	options: {
		baseEvent: 'keyup',
		eventContainer: document,
		eventCheckNext: function(e){
			return true;
		},
		eventCheckPrevious: function(e){ 
			return true;
		},
		onLoad: $empty,
		onNext: $empty,
		onPrevious: $empty,
		startIndex: 0
	},
	initialize: function(collection,options) {
		this.setOptions(options);
		this.collection = $$(collection);
		if(this.options.container == document) this.options.container = document.body;
		this.index = this.options.startIndex;
		if(this.options.baseEvent) {
			$(this.options.eventContainer).addEvent(this.options.baseEvent,function(e) {
				if(this.options.eventCheckNext(e)) {
					this.move.bind(this)('next');
				}
				else if(this.options.eventCheckPrevious(e)) {
					this.move.bind(this)('previous');
				}
			}.bind(this));
		}
		this.fireEvent('load',[this.collection[this.index]]);
	},
	move: function(norp) {
		var previous = this.index;
		switch($type(norp)) {
			case 'string':
				var ev = 'next';
				if(norp == 'next') {
					var plus = this.index + 1;
					this.index = this.collection[plus] ? plus : 0;
				}
				else {
					var minus = this.index - 1;
					this.index = this.collection[minus] ? minus : this.collection.length-1;
					ev = 'previous';
				}
				this.fireEvent(ev,[this.collection[this.index],this.collection[previous]]);
				break;
			case 'element':
				this.index = this.collection.indexOf(norp) || 0;
				break;
			default:
				this.index = norp;
				break;
		}
		this.fireEvent('change',[this.collection[this.index],this.collection[previous]]);
		return this;
	}
});

The following are arguments, options, and events for NextPrev:

Arguments

collection: The collection of elements..
options: The instance options.

Options

baseEvent: (defaults to ‘keyup’) The event to listen to.
eventContainer: (defaults to document) The event listener container.
eventCheckNext: (defaults to function) The function that decides if the conditions to trigger a “next” have been met.
eventCheckPrevious: (defaults to function) The function that decides if the conditions to trigger a “previous” have been met.
startIndex: (defaults to 0) The starting index for the collection.

Events

change: Fired when the index changes.
load: Fired every time the class is initialized.
next: Fired when the next directive is triggered.
previous: Fired when the previous directive is triggered.

Public Methods

move: May be passed the Strings “next” or “prev”, or a DOM node.

Sample Usage

var np2 = new NextPrev($$('#images img'),{
	eventCheckNext: function(e) {
		if(e) e.stop(e);
		return e.key == 'right';
	},
	eventCheckPrevious: function(e) {
		if(e) e.stop(e);
		return e.key == 'left';
	},
	onNext: function(cur,prev) {
		prev.removeClass('featured');
		cur.addClass('featured');
	},
	onPrevious: function(cur,prev) {
		prev.removeClass('featured');
		cur.addClass('featured');
	},
	onLoad: function(cur) {
		cur.addClass('featured');
	}
});

The code above hijacks the “left” and “right” keys, moving forward and backward in the collection depending on which key was pressed.

View Demo

NextPrev is extremely simple but also quite flexible. You decide the events, keys, actions, etc — the plugin simple allows for simple control of position in the list. Have ideas for this class? Know what you’d use it for? Let me know!

Create a Simple News Scroller Using Dojo

2010-03-09T15:06:14Z

My journey into Dojo javascript has been exciting and I’m continuing to learn more as I port MooTools scripts to Dojo. My latest experiment is porting a simple new scroller from MooTools to Dojo. The code is very similar!

View Demo

The HTML


	
		News Item 1
Pellentesque habitant morbi...Read More
		News Item 2
Pellentesque habitant morbi...Read More

The news items are placed into list items. The UL will be the element that’s animated.

The CSS

#news-feed	 { height:200px; width:300px; overflow:hidden; position:relative; border:1px solid #ccc; background:#eee; }
#news-feed ul	{ position:absolute; top:0; left:0; list-style-type:none; padding:0; margin:0; }
#news-feed ul li { min-height:180px; font-size:12px; margin:0; padding:10px; overflow:hidden; }

The absolute positioning is essential to proper animation. Unlike my MooTools example, this example no longer requires a fixed height for each news item. I did add a minimum height so only one item shows up within the scroller window at a time.

The Dojo Javascript

dojo.require('dojo.NodeList-fx');
dojo.addOnLoad(function() {
	/* settings */
	var list = dojo.query('#news-feed ul'),
		items = list.query("li"),
		showDuration = 3000,
		scrollDuration = 500,
		scrollTopDuration = 200,
		index = 0,
		interval;

	/* movement */
	var start = function() { interval = setInterval(move,showDuration); };
	var stop = function() { if(interval) clearInterval(interval); };
	var reset = function() {
	    list.anim({ top: 0}, scrollTopDuration, null, start);
	};
	/* action! */
	var move = function() {
	    list.anim({ top: (0 - (dojo.coords(items[++index]).t)) }, scrollDuration, null, function(){
			if(index == items.length - 1) {
				index = 0-1;
				stop();
				setTimeout(reset,showDuration);
			}
	    });
	};

	/* stop and start during mouseenter, mouseleave  */
	list.onmouseenter(stop).onmouseleave(start);

	/* go! */
	start();
});

This is where I have the epic description…but the above code (at least for MooTools users) should look familiar. The logic is exactly the same but the code uses dojo.* methods instead of MooTools’ Fx, $$, $, and Element.Dimensions methods.

The MooTools Javascript

window.addEvent('domready',function() {
	/* settings */
	var list = $('news-feed').getFirst('ul');
	var items = list.getElements('li');
	var showDuration = 3000;
	var scrollDuration = 500;
	var index = 0;
	var height = items[0].getSize().y;
	/* action func */
	var move = function() {
		list.set('tween',{
			duration: scrollDuration,
			onComplete: function() {
				if(index == items.length - 1) {
					index = 0 - 1;
					list.scrollTo(0,0);
				}
			}
		}).tween('top',0 - (++index * height));
	};
	/* go! */
	window.addEvent('load',function() {		
		move.periodical(showDuration);
	});
});

The above code was taken from my original post. Take a moment to compare the Dojo and MooTools code.

View Demo

What do you think? Three Dojo posts in — what are your thoughts about Dojo to this point?

“MooTools as a General Purpose Application Framework” by Christoph Pojer

2010-03-08T21:31:21Z

I wanted to bring attention to an outstanding presentation given by MooTools Core Developer Christoph Pojer. Given at FOSDEM 2010, Christoph provides an overview of what MooTools is, who should use it, how it should be used. Examples are given throughout the presentation.

I highly recommend MooTools users of all experience levels watch this video, as well as jQuery or Dojo users looking to simply understand what this framework is about.

Don't forget to follow me on Twitter and be sure to visit Script & Style for the best Javascript and CSS articles around!Sponsor the David Walsh Blog and get your brand in front of several thousand users per day!

“MooTools as a General Purpose Application Framework” by Christoph Pojer

Remove Broken Images Using Dojo

2010-03-02T13:22:47Z

In an effort to get better with the Dojo Toolkit, I’ve decided to port yet another one of my previous posts: Remove Broken Images Using MooTools or jQuery. Broken images are an eyesore to any website so there’s no point to keeping them in the page. Here’s how you can remove them on the client side.

The Dojo Javascript

dojo.ready(function() {
	dojo.query('img').forEach(function(img){
		dojo.connect(img,'onerror',function() {
			dojo.destroy(img);
		});
	});
});

Just as simple as jQuery and MooTools — just a different syntax!

Link Nudging Using Dojo

2010-03-03T15:30:04Z

In the past we’ve tinkered with link nudging with MooTools and link nudging with jQuery. In an effort to familiarize myself with other javascript frameworks, we’re going to try to duplicate that effect with another awesome framework: Dojo.

View Demo

The Javascript: Attempt 1

dojo.addOnLoad(function() {
	var links = dojo.query('a.nudge');
	//foreach...
	dojo.forEach(links,function(link) {
		var left = dojo.style(link,'paddingLeft');
		dojo.connect(link,'onmouseenter',function() {
			dojo.animateProperty({
				node:link,
				properties: {
					paddingLeft: (left + 10)
				}
			}).play();
		});
		dojo.connect(link,'onmouseleave',function() {
			dojo.animateProperty({
				node:link,
				properties: {
					paddingLeft: left
				}
			}).play();
		});
	});
});

Once the DOM is ready, we use the dojo.query method to find all of the links to nudge. For every link we find, we record its original left padding and add mouseenter and mouseleave events to each link to animate its left padding.

The Javascript: Better Solution

dojo.ready(function() {
	dojo.query('a.nudge').forEach(function(link){
		var left = dojo.style(link,'paddingLeft');
		dojo.connect(link,'onmouseenter',function() {
		    dojo.anim(link, { paddingLeft:20 });
		});
		dojo.connect(link,'onmouseleave',function() {
		    dojo.anim(link, { paddingLeft:left });
		});
	});
});

Dojo lead Pete Higgins showed me a more condensed version of his script.

View Demo

Simple, no? The best way to learn to use any javascript framework is to duplicate a given set of code you are familiar with, much like we did here. What do you think about this Dojo example? Look close to jQuery and MooTools?