手把手教你开发jquery插件（一）

Just as the auther of jQuery Tools said:

jQuery UI has a so-called “unified API” which uses the following syntax
for invoking methods:

// call select method for tabs $("ul.example").tabs("select", 1);

API methods are called by supplying the method name as a string followed by method arguments. To be honest, I think that this kind API design is fundamentally wrong. It has the following problems:

1. The syntax is unique to jQuery UI and people outside the UI community are not accustomed to it

2. The syntax is cubersome. For example, if you want to perform method chaining you have to write the following:$(”ul.example”).tabs(”select”, 1).tabs(”disable”, 2);

3. The JavaScript engine cannot see typos. writing “selecct” does not look
   like an error to a browser, making it harder to debug.

I dislike the jQuery UI’s unified API either. There is another article supporting jQuery UI’s unified API:

With jQuery UI, all the plugins work with jQuery and it’s philosophy. Working with
John Resig’s supervision and incite. Working together. Returning a seperate API
has some potential, but not the way it is implimented here.

In my opinion, a component is a collection of nodes, properties, events and methods,
which should be presented in his own instance not the DOM node in jQuery.

I love jQuery, but i think the components based on jQuery should be more like extjs,
qooxdoo.

Maybe it’s time for me to learn how to write a jQuery plugin, and convert it to
the way used in jQuery Tools.

A simple jQuery tabs plugin

Html markup is the same as jQuery UI Tabs.

<div class="tabs">
        <ul>
            <li><a href="javascript:;" >Tab 1</a></li>
            <li><a href="javascript:;" >Tab 2</a></li>
            <li><a href="javascript:;" >Tab 3</a></li>
        </ul>
        <div>
            Pane 1 content</div>
        <div>
            Pane 2 content</div>
        <div>
            Pane 3 content</div>
    </div>

Let’s write some basic CSS rules:

.tabs ul
    {
        list-style-type: none;
        padding: 0px;
        margin: 0px;
    }
    .tabs li
    {
        display: inline;
    }
    .tabs li a
    {
        text-decoration: none;
    }
    .tabs a.current
    {
        background-color: #ccc;
    }

And the jQuery plugin code:

(function($) {  

        $.fn.tabs = function() {  

            var tabs = this.children("ul").find("li > a");
            var panes = this.children("div");
            var current = 0;  

            function clickTab(index) {
                current = index;
                tabs.removeClass("current").eq(current).addClass("current");
                panes.hide().eq(current).show();
            }  

            clickTab(0);  

            tabs.click(function() {
                clickTab(tabs.index(this));
            });  

            return this;
        };  

    })

The invoke code:

$(function() {
        $("div.tabs").tabs();
    });