What Does '(function($) {})(jQuery);' Really Do?
Question:
Can someone clarify the purpose and variations of the following jQuery plugin syntaxes?
<br>(function($) {})(jQuery);<br>
How does it differ from these examples:
Type 1:
<br>(function($) {</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">$.fn.jPluginName = {
},
$.fn.jPluginName.defaults = {
}})(jQuery);
Type 2:
<br>(function($) {</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">$.jPluginName = {
}})(jQuery);
Type 3:
<br>(function($){</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">//Attach this new method to jQuery
$.fn.extend({
var defaults = {
}
var options = $.extend(defaults, options);
//This is where you write your plugin's name
pluginname: function() {
//Iterate over the current set of matched elements
return this.each(function() {
//code to be inserted here
});
}
}); })(jQuery);
Answer:
Breaking Down '(function($) {})(jQuery);'
This code snippet is commonly used to define a closure that immediately calls the enclosed function, passing jQuery as an argument. It's equivalent to:
<br>function($) {}($);<br>
This technique is employed to create a local scope for the plugin, preventing conflicts with other plugins or global variables.
Plugin Syntax Variations:
Type 1:
This syntax attaches methods and default options to $.fn, effectively creating a jQuery plugin that can be accessed as $(element).jPluginName().
Type 2:
This syntax extends the jQuery core functionality rather than creating a plugin. It's useful for adding traversal functions or other utilities to jQuery itself.
Type 3:
This syntax is similar to Type 1 but uses $.fn.extend to attach the plugin method to the jQuery prototype. It provides a structured and modular way to create plugins.
Which Syntax to Use:
Type 1 should be used to create plugins that manipulate DOM elements.
Type 2 should be used when extending jQuery core functionality.
Type 3 is the preferred choice for most plugin development scenarios.
The above is the detailed content of What are the different ways to create a jQuery plugin, and how do they differ in their functionality and use cases?. For more information, please follow other related articles on the PHP Chinese website!
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