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jQuery Plugin Development

Posted: September 24th, 2010 | Author: | Filed under: Javascript, JQuery, Web Development | Tags: , , | 4 Comments »

You can write your jQuery plugin as advanced as you please.
This for example, is a jQuery Plugin:

	jQuery.fn.log = function (msg) {
		console.log("%s: %o", msg, this);
		return this;
	};

But the whole jQuery UI Accordion is also a plugin :-)

I went out to write a larger kind of plugin for a website. And I wanted to find a good plugin writing pattern. These links helped:

Most of them agree to extending the jQuery namespace:

(function($) {
    $.fn.myplugin = function(){
        //Stuff here...
    };
})(jQuery);

But I do miss a bit of Object Orientation in most of them.
I decided to take a bit of each, and create my own approach.
I won’t explain it much, it should be understandable with the comments in code:

(function($){
	/**
	** Seperate object. So each element applied with this plugin has an object structure
	**/
	function PluginObject(container,options){
		//I like to keep a reference to the object I'm working on
		var holder = container;
		//Store 'this' as an instance variable. This comes in handy when you want to speak to it as a reference in clickhandlers etc.
		var _self = this;
		this.init = function()
		{
			//initialize UI and data here
		}
 
		this.test = function()
		{
			//This function serves as a demo method that can be called from outside
		}
		this.render = function()
		{
			// Do complicated rendering here
 
			// Trigger the onRender that could be set through the options
			this.trigger('onRender');
		}
		this.init();
	}
	$.fn.myplugin = function(action,options){
		/**
		** 'action' can be an argument for a function to call
		** If no action is defined, and we just start with the options, initialize is called
		**/
		if (typeof(action) == 'object') {
			options = action;
			action = 'initialize';
		}else if(action == undefined)
		{
			action = 'initialize';
		}
		if(options == undefined)
		{
			options = {};
		}
		/**
		** Set, or update the options
		**/
		function setOptions(el) {
			// If any of the options is a function, bind that as an event
			// this can be something like: 'onRender'
			$.each(options, function(event, fn) {
				if (typeof(fn) == 'function') {
					//Unbind the event if it was already bound
					el.unbind(event);
					//Bind the event with the given function
					el.bind(event, fn);
				}
			});
			//Extend the options with the defaults, and the options already saved in the object
			options = $.extend({}, defaults, el.data('shelf.options'), options);
			// Save the options in the object's data
			el.data('shelf.options', options);
		};
		// Default options
		var defaults = {
			width: 	'900px',
			title: 'Cool Stuff'
		};
		/**
		** This is called everytime we do $(..).myplugin(..)
		**/
		return this.each(function(el){
			el = $(this);
			setOptions(el);
			if(action == 'initialize' || el.data('shelf') == undefined){
				// Initialize the object, save it in itself
				el.data('shelf', new PluginObject(el, options));
			}
			// if called like $(..).myplugin('test'), this is called
			if(action == 'test')
				el.data('shelf').test();
			// This will call render(), render will also trigger 'onRender'
			if(action == 'render')
				el.data('shelf').render();
		});
 
	};
})(jQuery);

Do you develop plugins differently? Or got a good link? I would love to hear about it!


Radio Button values in jQuery

Posted: August 27th, 2010 | Author: | Filed under: Javascript, JQuery, Web Development | Tags: , , , , | No Comments »

Getting the values of radio buttons in Javascript can be a bit of a pain in the behind at times.
You’ll have to assign a different ID to each radiobutton, loop over them to see which one is checked, and return that value.
Too much hassle.

However, jQuery selectors to the rescue!
Suppose you have the following radio buttons:

<input type="radio" name="animals" value="Dog" />
<input type="radio" name="animals" value="Cat" />
<input type="radio" name="animals" value="Bird" />

Getting the selected value could be done like so:

$('input[name=animals]:checked').val()

Try it here:

Dog

Cat

Bird

Good luck, hope it helps someone!


Those fancy GMail buttons, with actual buttons!

Posted: August 25th, 2010 | Author: | Filed under: css, Web Development | Tags: , , , | 1 Comment »

After my post about gmail buttons yesterday, my friend Steven started working on that code.

He came up with an improved version of my example, one that works with actual buttons! Let me demonstrate below:

CSS Code:

input[type="button"], input[type="submit"], button {
margin:0 8px 0 0;
padding:2px 6px;
 
text-align:center;
vertical-align:middle;
 
display: inline-block;
white-space:nowrap;
cursor: pointer;
 
outline:none;
color:#000;
border: 1px solid #bbb;
 
-webkit-border-radius:3px;
-moz-border-radius:3px;
border-radius:3px;
 
background: -webkit-gradient(linear, left top, left bottom, from(#f9f9f9), to(#e3e3e3));
background: -moz-linear-gradient(top, #f9f9f9, #e3e3e3);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#f9f9f9', endColorstr='#e3e3e3');
 
border-top-color:#ccc;
border-bottom-color:#a0a0a0;
}
 
input[type="button"]:hover, input[type="submit"]:hover, button:hover {
border: 1px solid #636363;
}
 
input[type="button"]:active, input[type="submit"]:active, button:active {
background: -webkit-gradient(linear, left top, left bottom, from(#e3e3e3), to(#f9f9f9));
background: -moz-linear-gradient(top, #e3e3e3, #f9f9f9);
filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#e3e3e3', endColorstr='#f9f9f9');
}

HTML can be any of the following:

<input type="button" value="it's a button" />
<input type="submit" value="it's a submit button" />
<button>It's a button button</button>

See that code in action right here:

The link to Steven’s post: credit goes where credit is due

P.S.:I know the hover border doesn’t work here, it does work where I implemented the buttons. I’ll look at this later

Update: Xavier Bertels from Live Graphics also had a go at the buttons
This is becoming more and more of a team effort, love it!


Those fancy GMail buttons

Posted: August 24th, 2010 | Author: | Filed under: css, Javascript, Web Development | Tags: , , , | 2 Comments »

For a project I’ve been working on, I wanted to use a different kind of button then the normal HTML .

I decided to go for the GMail style button!
They’re really nice:

  • simple HTML
  • still looks like a button (user friendlyness++)
  • has a modern look aswell

It’s been done before by stopdesign.com, but I wanted to do it myself
I went to dive in some Google CSS and came up with the following:
CSS:

.btn{
	margin:0 8px 0 0;
	padding:3px 8px;
	text-align:center;
	vertical-align:middle;
	white-space:nowrap;
	cursor:default;
	outline:none;
	font:arial,sans-serif;
	color:#000;
	border:	1px solid #bbb;
	-webkit-border-radius:3px;
	-moz-border-radius:3px;
	border-radius: 3px;
	background: -webkit-gradient(linear, left top, left bottom, from(#f9f9f9), to(#e3e3e3)); 
        background: -moz-linear-gradient(top, #f9f9f9, #e3e3e3);
        filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#f9f9f9', endColorstr='#e3e3e3');
	border-top-color:#ccc;
	border-bottom-color:#a0a0a0;
	cursor: pointer;
	display: inline-block;
	position: relative;
}
.btn:hover{
	border: 1px solid #636363;
}

Now simply make all your buttons like so:

<div class="btn"><span>Cooler button!</span></div>

which gives you this:

Cooler button!

Strong note: These aren’t actually buttons, they can’t really be used as form-submit buttons as they can only respond to Javascript onClick events! My newer post on the real buttons does do this!
Tested in FF 3.6, Chrome 5, IE8


JQuery UI tabs with selected by #location.hash

Posted: August 5th, 2010 | Author: | Filed under: Javascript, JQuery, Web Development | Tags: , , , | No Comments »

I’m using JQuery UI Tabs in an application.
I really love the implementation, never seen anything so easy.

If you want to make sure another tab but the first one is selected on page load, just give the ‘selected’ option like so:

$("#tabs").tabs({selected: 1});

For the second tab in the tabarray (counting starts with 0).

If you want to make your url’s do the following however: http://www.example.com/mytabbedpage.do#gotothistab. There’s no support from JQuery itself just yet.

I found a solution on Rootsmith Inc’s blog.
Especially sami‘s comment helped me:

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$(’#my_selector’).tabs({
’select’: function(){$(this).index($(document.location.hash));},
‘load’: function(event, ui){document.location.hash = ui.panel.id;}
});

However, applying this loses your default tab.
My solution:

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var selectedtab = 1;
if(document.location.hash!="" && typeof(document.location.hash)!="undefined" && document.location.hash!= null){
	selectedtab = $(document.location.hash).index() - 1;
}
$("#tabs").tabs({selected:selectedtab});

I know, I like to be thorough in my checks ;-)