global or local variables in a jquery-plugin
How is it possible to give a jquery-plugin individual local variables, that are accessable in different plugin-functions?
My script shows an alert with the content '123', but I am expecting 'abc'. So variable 't' exists only once and not twice for each plugin. So for each plugin-instance there should be also an instance of variable 't'.
<html>
<head>
<title></title>
<script type="text/javascript" src="jquery/jquery-1.7.min.js"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/jquery-ui.min.js" type="text/javascript"></script>
<script type="text/javascript">
(function ($) {
var t = null;
$.fn.doSomething = function()
{
alert(t);
}
$.fn.myHtmlControl = function(option) {
t = option;
}
})(jQuery);
$(function () {
$('#ctrl1').myHtmlControl("abc");
$('#ctrl2').myHtmlControl("123");
$('#ctrl1').doSomething();
})
</script>
</head>
<body>
<div id='ctrl1'>Ctrl1</div>
<div id='ctrl2'>Ctrl2</div>
</body>
</html>
Answer
All you need is here :
// jQuery Plugin Boilerplate
// A boilerplate for jumpstarting jQuery plugins development
// version 1.1, May 14th, 2011
// by Stefan Gabos
// remember to change every instance of "pluginName" to the name of your plugin!
(function($) {
// here we go!
$.pluginName = function(element, options) {
// plugin's default options
// this is private property and is accessible only from inside the plugin
var defaults = {
foo: 'bar',
// if your plugin is event-driven, you may provide callback capabilities for its events.
// execute these functions before or after events of your plugin, so that users may customize
// those particular events without changing the plugin's code
onFoo: function() {}
}
// to avoid confusions, use "plugin" to reference the current instance of the object
var plugin = this;
// this will hold the merged default, and user-provided options
// plugin's properties will be available through this object like:
// plugin.settings.propertyName from inside the plugin or
// element.data('pluginName').settings.propertyName from outside the plugin, where "element" is the
// element the plugin is attached to;
plugin.settings = {}
var $element = $(element), // reference to the jQuery version of DOM element the plugin is attached to
element = element; // reference to the actual DOM element
// the "constructor" method that gets called when the object is created
plugin.init = function() {
// the plugin's final properties are the merged default and user-provided options (if any)
plugin.settings = $.extend({}, defaults, options);
// code goes here
}
// public methods
// these methods can be called like:
// plugin.methodName(arg1, arg2, ... argn) from inside the plugin or
// element.data('pluginName').publicMethod(arg1, arg2, ... argn) from outside the plugin, where "element"
// is the element the plugin is attached to;
// a public method. for demonstration purposes only - remove it!
plugin.foo_public_method = function() {
// code goes here
}
// private methods
// these methods can be called only from inside the plugin like:
// methodName(arg1, arg2, ... argn)
// a private method. for demonstration purposes only - remove it!
var foo_private_method = function() {
// code goes here
}
// fire up the plugin!
// call the "constructor" method
plugin.init();
}
// add the plugin to the jQuery.fn object
$.fn.pluginName = function(options) {
// iterate through the DOM elements we are attaching the plugin to
return this.each(function() {
// if plugin has not already been attached to the element
if (undefined == $(this).data('pluginName')) {
// create a new instance of the plugin
// pass the DOM element and the user-provided options as arguments
var plugin = new $.pluginName(this, options);
// in the jQuery version of the element
// store a reference to the plugin object
// you can later access the plugin and its methods and properties like
// element.data('pluginName').publicMethod(arg1, arg2, ... argn) or
// element.data('pluginName').settings.propertyName
$(this).data('pluginName', plugin);
}
});
}
})(jQuery);
Source : http://stefangabos.ro/jquery/jquery-plugin-boilerplate-revisited/