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| /*! | ||
| * jQuery throttle / debounce - v1.1 - 3/7/2010 | ||
| * http://benalman.com/projects/jquery-throttle-debounce-plugin/ | ||
| * | ||
| * Copyright (c) 2010 "Cowboy" Ben Alman | ||
| * Dual licensed under the MIT and GPL licenses. | ||
| * http://benalman.com/about/license/ | ||
| */ | ||
|
|
||
| // Script: jQuery throttle / debounce: Sometimes, less is more! | ||
| // | ||
| // *Version: 1.1, Last updated: 3/7/2010* | ||
| // | ||
| // Project Home - http://benalman.com/projects/jquery-throttle-debounce-plugin/ | ||
| // GitHub - http://github.com/cowboy/jquery-throttle-debounce/ | ||
| // Source - http://github.com/cowboy/jquery-throttle-debounce/raw/master/jquery.ba-throttle-debounce.js | ||
| // (Minified) - http://github.com/cowboy/jquery-throttle-debounce/raw/master/jquery.ba-throttle-debounce.min.js (0.7kb) | ||
| // | ||
| // About: License | ||
| // | ||
| // Copyright (c) 2010 "Cowboy" Ben Alman, | ||
| // Dual licensed under the MIT and GPL licenses. | ||
| // http://benalman.com/about/license/ | ||
| // | ||
| // About: Examples | ||
| // | ||
| // These working examples, complete with fully commented code, illustrate a few | ||
| // ways in which this plugin can be used. | ||
| // | ||
| // Throttle - http://benalman.com/code/projects/jquery-throttle-debounce/examples/throttle/ | ||
| // Debounce - http://benalman.com/code/projects/jquery-throttle-debounce/examples/debounce/ | ||
| // | ||
| // About: Support and Testing | ||
| // | ||
| // Information about what version or versions of jQuery this plugin has been | ||
| // tested with, what browsers it has been tested in, and where the unit tests | ||
| // reside (so you can test it yourself). | ||
| // | ||
| // jQuery Versions - none, 1.3.2, 1.4.2 | ||
| // Browsers Tested - Internet Explorer 6-8, Firefox 2-3.6, Safari 3-4, Chrome 4-5, Opera 9.6-10.1. | ||
| // Unit Tests - http://benalman.com/code/projects/jquery-throttle-debounce/unit/ | ||
| // | ||
| // About: Release History | ||
| // | ||
| // 1.1 - (3/7/2010) Fixed a bug in <jQuery.throttle> where trailing callbacks | ||
| // executed later than they should. Reworked a fair amount of internal | ||
| // logic as well. | ||
| // 1.0 - (3/6/2010) Initial release as a stand-alone project. Migrated over | ||
| // from jquery-misc repo v0.4 to jquery-throttle repo v1.0, added the | ||
| // no_trailing throttle parameter and debounce functionality. | ||
| // | ||
| // Topic: Note for non-jQuery users | ||
| // | ||
| // jQuery isn't actually required for this plugin, because nothing internal | ||
| // uses any jQuery methods or properties. jQuery is just used as a namespace | ||
| // under which these methods can exist. | ||
| // | ||
| // Since jQuery isn't actually required for this plugin, if jQuery doesn't exist | ||
| // when this plugin is loaded, the method described below will be created in | ||
| // the `Cowboy` namespace. Usage will be exactly the same, but instead of | ||
| // $.method() or jQuery.method(), you'll need to use Cowboy.method(). | ||
|
|
||
| (function(window,undefined){ | ||
| '$:nomunge'; // Used by YUI compressor. | ||
|
|
||
| // Since jQuery really isn't required for this plugin, use `jQuery` as the | ||
| // namespace only if it already exists, otherwise use the `Cowboy` namespace, | ||
| // creating it if necessary. | ||
| var $ = window.jQuery || window.Cowboy || ( window.Cowboy = {} ), | ||
|
|
||
| // Internal method reference. | ||
| jq_throttle; | ||
|
|
||
| // Method: jQuery.throttle | ||
| // | ||
| // Throttle execution of a function. Especially useful for rate limiting | ||
| // execution of handlers on events like resize and scroll. If you want to | ||
| // rate-limit execution of a function to a single time, see the | ||
| // <jQuery.debounce> method. | ||
| // | ||
| // In this visualization, | is a throttled-function call and X is the actual | ||
| // callback execution: | ||
| // | ||
| // > Throttled with `no_trailing` specified as false or unspecified: | ||
| // > ||||||||||||||||||||||||| (pause) ||||||||||||||||||||||||| | ||
| // > X X X X X X X X X X X X | ||
| // > | ||
| // > Throttled with `no_trailing` specified as true: | ||
| // > ||||||||||||||||||||||||| (pause) ||||||||||||||||||||||||| | ||
| // > X X X X X X X X X X | ||
| // | ||
| // Usage: | ||
| // | ||
| // > var throttled = jQuery.throttle( delay, [ no_trailing, ] callback ); | ||
| // > | ||
| // > jQuery('selector').bind( 'someevent', throttled ); | ||
| // > jQuery('selector').unbind( 'someevent', throttled ); | ||
| // | ||
| // This also works in jQuery 1.4+: | ||
| // | ||
| // > jQuery('selector').bind( 'someevent', jQuery.throttle( delay, [ no_trailing, ] callback ) ); | ||
| // > jQuery('selector').unbind( 'someevent', callback ); | ||
| // | ||
| // Arguments: | ||
| // | ||
| // delay - (Number) A zero-or-greater delay in milliseconds. For event | ||
| // callbacks, values around 100 or 250 (or even higher) are most useful. | ||
| // no_trailing - (Boolean) Optional, defaults to false. If no_trailing is | ||
| // true, callback will only execute every `delay` milliseconds while the | ||
| // throttled-function is being called. If no_trailing is false or | ||
| // unspecified, callback will be executed one final time after the last | ||
| // throttled-function call. (After the throttled-function has not been | ||
| // called for `delay` milliseconds, the internal counter is reset) | ||
| // callback - (Function) A function to be executed after delay milliseconds. | ||
| // The `this` context and all arguments are passed through, as-is, to | ||
| // `callback` when the throttled-function is executed. | ||
| // | ||
| // Returns: | ||
| // | ||
| // (Function) A new, throttled, function. | ||
|
|
||
| $.throttle = jq_throttle = function( delay, no_trailing, callback, debounce_mode ) { | ||
| // After wrapper has stopped being called, this timeout ensures that | ||
| // `callback` is executed at the proper times in `throttle` and `end` | ||
| // debounce modes. | ||
| var timeout_id, | ||
|
|
||
| // Keep track of the last time `callback` was executed. | ||
| last_exec = 0; | ||
|
|
||
| // `no_trailing` defaults to falsy. | ||
| if ( typeof no_trailing !== 'boolean' ) { | ||
| debounce_mode = callback; | ||
| callback = no_trailing; | ||
| no_trailing = undefined; | ||
| } | ||
|
|
||
| // The `wrapper` function encapsulates all of the throttling / debouncing | ||
| // functionality and when executed will limit the rate at which `callback` | ||
| // is executed. | ||
| function wrapper() { | ||
| var that = this, | ||
| elapsed = +new Date() - last_exec, | ||
| args = arguments; | ||
|
|
||
| // Execute `callback` and update the `last_exec` timestamp. | ||
| function exec() { | ||
| last_exec = +new Date(); | ||
| callback.apply( that, args ); | ||
| }; | ||
|
|
||
| // If `debounce_mode` is true (at_begin) this is used to clear the flag | ||
| // to allow future `callback` executions. | ||
| function clear() { | ||
| timeout_id = undefined; | ||
| }; | ||
|
|
||
| if ( debounce_mode && !timeout_id ) { | ||
| // Since `wrapper` is being called for the first time and | ||
| // `debounce_mode` is true (at_begin), execute `callback`. | ||
| exec(); | ||
| } | ||
|
|
||
| // Clear any existing timeout. | ||
| timeout_id && clearTimeout( timeout_id ); | ||
|
|
||
| if ( debounce_mode === undefined && elapsed > delay ) { | ||
| // In throttle mode, if `delay` time has been exceeded, execute | ||
| // `callback`. | ||
| exec(); | ||
|
|
||
| } else if ( no_trailing !== true ) { | ||
| // In trailing throttle mode, since `delay` time has not been | ||
| // exceeded, schedule `callback` to execute `delay` ms after most | ||
| // recent execution. | ||
| // | ||
| // If `debounce_mode` is true (at_begin), schedule `clear` to execute | ||
| // after `delay` ms. | ||
| // | ||
| // If `debounce_mode` is false (at end), schedule `callback` to | ||
| // execute after `delay` ms. | ||
| timeout_id = setTimeout( debounce_mode ? clear : exec, debounce_mode === undefined ? delay - elapsed : delay ); | ||
| } | ||
| }; | ||
|
|
||
| // Set the guid of `wrapper` function to the same of original callback, so | ||
| // it can be removed in jQuery 1.4+ .unbind or .die by using the original | ||
| // callback as a reference. | ||
| if ( $.guid ) { | ||
| wrapper.guid = callback.guid = callback.guid || $.guid++; | ||
| } | ||
|
|
||
| // Return the wrapper function. | ||
| return wrapper; | ||
| }; | ||
|
|
||
| // Method: jQuery.debounce | ||
| // | ||
| // Debounce execution of a function. Debouncing, unlike throttling, | ||
| // guarantees that a function is only executed a single time, either at the | ||
| // very beginning of a series of calls, or at the very end. If you want to | ||
| // simply rate-limit execution of a function, see the <jQuery.throttle> | ||
| // method. | ||
| // | ||
| // In this visualization, | is a debounced-function call and X is the actual | ||
| // callback execution: | ||
| // | ||
| // > Debounced with `at_begin` specified as false or unspecified: | ||
| // > ||||||||||||||||||||||||| (pause) ||||||||||||||||||||||||| | ||
| // > X X | ||
| // > | ||
| // > Debounced with `at_begin` specified as true: | ||
| // > ||||||||||||||||||||||||| (pause) ||||||||||||||||||||||||| | ||
| // > X X | ||
| // | ||
| // Usage: | ||
| // | ||
| // > var debounced = jQuery.debounce( delay, [ at_begin, ] callback ); | ||
| // > | ||
| // > jQuery('selector').bind( 'someevent', debounced ); | ||
| // > jQuery('selector').unbind( 'someevent', debounced ); | ||
| // | ||
| // This also works in jQuery 1.4+: | ||
| // | ||
| // > jQuery('selector').bind( 'someevent', jQuery.debounce( delay, [ at_begin, ] callback ) ); | ||
| // > jQuery('selector').unbind( 'someevent', callback ); | ||
| // | ||
| // Arguments: | ||
| // | ||
| // delay - (Number) A zero-or-greater delay in milliseconds. For event | ||
| // callbacks, values around 100 or 250 (or even higher) are most useful. | ||
| // at_begin - (Boolean) Optional, defaults to false. If at_begin is false or | ||
| // unspecified, callback will only be executed `delay` milliseconds after | ||
| // the last debounced-function call. If at_begin is true, callback will be | ||
| // executed only at the first debounced-function call. (After the | ||
| // throttled-function has not been called for `delay` milliseconds, the | ||
| // internal counter is reset) | ||
| // callback - (Function) A function to be executed after delay milliseconds. | ||
| // The `this` context and all arguments are passed through, as-is, to | ||
| // `callback` when the debounced-function is executed. | ||
| // | ||
| // Returns: | ||
| // | ||
| // (Function) A new, debounced, function. | ||
|
|
||
| $.debounce = function( delay, at_begin, callback ) { | ||
| return callback === undefined | ||
| ? jq_throttle( delay, at_begin, false ) | ||
| : jq_throttle( delay, callback, at_begin !== false ); | ||
| }; | ||
|
|
||
| })(this); |
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