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  <pre class="prettyprint lang-js"><span id='Ext-util-DelayedTask-method-constructor'><span id='Ext-util-DelayedTask'>/**
</span></span> * @class Ext.util.DelayedTask
 * &lt;p&gt; The DelayedTask class provides a convenient way to &quot;buffer&quot; the execution of a method,
 * performing setTimeout where a new timeout cancels the old timeout. When called, the
 * task will wait the specified time period before executing. If durng that time period,
 * the task is called again, the original call will be cancelled. This continues so that
 * the function is only called a single time for each iteration.&lt;/p&gt;
 * &lt;p&gt;This method is especially useful for things like detecting whether a user has finished
 * typing in a text field. An example would be performing validation on a keypress. You can
 * use this class to buffer the keypress events for a certain number of milliseconds, and
 * perform only if they stop for that amount of time.  Usage:&lt;/p&gt;&lt;pre&gt;&lt;code&gt;
var task = new Ext.util.DelayedTask(function(){
    alert(Ext.getDom('myInputField').value.length);
});
// Wait 500ms before calling our function. If the user presses another key 
// during that 500ms, it will be cancelled and we'll wait another 500ms.
Ext.get('myInputField').on('keypress', function(){
    task.{@link #delay}(500); 
});
 * &lt;/code&gt;&lt;/pre&gt; 
 * &lt;p&gt;Note that we are using a DelayedTask here to illustrate a point. The configuration
 * option &lt;tt&gt;buffer&lt;/tt&gt; for {@link Ext.util.Observable#addListener addListener/on} will
 * also setup a delayed task for you to buffer events.&lt;/p&gt; 
 * @constructor The parameters to this constructor serve as defaults and are not required.
 * @param {Function} fn (optional) The default function to call.
 * @param {Object} scope (optional) The default scope (The &lt;code&gt;&lt;b&gt;this&lt;/b&gt;&lt;/code&gt; reference) in which the
 * function is called. If not specified, &lt;code&gt;this&lt;/code&gt; will refer to the browser window.
 * @param {Array} args (optional) The default Array of arguments.
 */
Ext.util.DelayedTask = function(fn, scope, args){
    var me = this,
    	id,    	
    	call = function(){
    		clearInterval(id);
	        id = null;
	        fn.apply(scope, args || []);
	    };
	    
<span id='Ext-util-DelayedTask-method-delay'>    /**
</span>     * Cancels any pending timeout and queues a new one
     * @param {Number} delay The milliseconds to delay
     * @param {Function} newFn (optional) Overrides function passed to constructor
     * @param {Object} newScope (optional) Overrides scope passed to constructor. Remember that if no scope
     * is specified, &lt;code&gt;this&lt;/code&gt; will refer to the browser window.
     * @param {Array} newArgs (optional) Overrides args passed to constructor
     */
    me.delay = function(delay, newFn, newScope, newArgs){
        me.cancel();
        fn = newFn || fn;
        scope = newScope || scope;
        args = newArgs || args;
        id = setInterval(call, delay);
    };

<span id='Ext-util-DelayedTask-method-cancel'>    /**
</span>     * Cancel the last queued timeout
     */
    me.cancel = function(){
        if(id){
            clearInterval(id);
            id = null;
        }
    };
};</pre>
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