56 lines
1.7 KiB
JavaScript
56 lines
1.7 KiB
JavaScript
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/*
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* Ext JS Library 2.3.0
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* Copyright(c) 2006-2009, Ext JS, LLC.
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* licensing@extjs.com
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*
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* http://extjs.com/license
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*/
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/**
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* @class Ext.util.DelayedTask
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* Provides a convenient method of performing setTimeout where a new
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* timeout cancels the old timeout. An example would be performing validation on a keypress.
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* You can use this class to buffer
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* the keypress events for a certain number of milliseconds, and perform only if they stop
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* for that amount of time.
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* @constructor The parameters to this constructor serve as defaults and are not required.
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* @param {Function} fn (optional) The default function to timeout
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* @param {Object} scope (optional) The default scope of that timeout
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* @param {Array} args (optional) The default Array of arguments
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*/
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Ext.util.DelayedTask = function(fn, scope, args){
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var id = null;
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var call = function(){
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id = null;
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fn.apply(scope, args || []);
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};
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/**
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* Cancels any pending timeout and queues a new one
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* @param {Number} delay The milliseconds to delay
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* @param {Function} newFn (optional) Overrides function passed to constructor
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* @param {Object} newScope (optional) Overrides scope passed to constructor
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* @param {Array} newArgs (optional) Overrides args passed to constructor
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*/
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this.delay = function(delay, newFn, newScope, newArgs){
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if(id){
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this.cancel();
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}
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fn = newFn || fn;
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scope = newScope || scope;
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args = newArgs || args;
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if(!id){
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id = setTimeout(call, delay);
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}
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};
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/**
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* Cancel the last queued timeout
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*/
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this.cancel = function(){
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if(id){
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clearTimeout(id);
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id = null;
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}
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};
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};
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