247 lines
9 KiB
JavaScript
247 lines
9 KiB
JavaScript
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/*!
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* jQuery resize event - v1.1 - 3/14/2010
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* http://benalman.com/projects/jquery-resize-plugin/
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*
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* Copyright (c) 2010 "Cowboy" Ben Alman
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* Dual licensed under the MIT and GPL licenses.
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* http://benalman.com/about/license/
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*/
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// Script: jQuery resize event
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//
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// *Version: 1.1, Last updated: 3/14/2010*
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//
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// Project Home - http://benalman.com/projects/jquery-resize-plugin/
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// GitHub - http://github.com/cowboy/jquery-resize/
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// Source - http://github.com/cowboy/jquery-resize/raw/master/jquery.ba-resize.js
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// (Minified) - http://github.com/cowboy/jquery-resize/raw/master/jquery.ba-resize.min.js (1.0kb)
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//
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// About: License
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//
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// Copyright (c) 2010 "Cowboy" Ben Alman,
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// Dual licensed under the MIT and GPL licenses.
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// http://benalman.com/about/license/
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//
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// About: Examples
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//
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// This working example, complete with fully commented code, illustrates a few
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// ways in which this plugin can be used.
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//
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// resize event - http://benalman.com/code/projects/jquery-resize/examples/resize/
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//
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// About: Support and Testing
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//
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// Information about what version or versions of jQuery this plugin has been
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// tested with, what browsers it has been tested in, and where the unit tests
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// reside (so you can test it yourself).
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//
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// jQuery Versions - 1.3.2, 1.4.1, 1.4.2
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// Browsers Tested - Internet Explorer 6-8, Firefox 2-3.6, Safari 3-4, Chrome, Opera 9.6-10.1.
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// Unit Tests - http://benalman.com/code/projects/jquery-resize/unit/
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//
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// About: Release History
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//
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// 1.1 - (3/14/2010) Fixed a minor bug that was causing the event to trigger
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// immediately after bind in some circumstances. Also changed $.fn.data
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// to $.data to improve performance.
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// 1.0 - (2/10/2010) Initial release
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(function($,window,undefined){
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'$:nomunge'; // Used by YUI compressor.
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// A jQuery object containing all non-window elements to which the resize
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// event is bound.
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var elems = $([]),
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// Extend $.resize if it already exists, otherwise create it.
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jq_resize = $.resize = $.extend( $.resize, {} ),
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timeout_id,
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// Reused strings.
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str_setTimeout = 'setTimeout',
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str_resize = 'resize',
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str_data = str_resize + '-special-event',
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str_delay = 'delay',
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str_throttle = 'throttleWindow';
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// Property: jQuery.resize.delay
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//
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// The numeric interval (in milliseconds) at which the resize event polling
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// loop executes. Defaults to 250.
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jq_resize[ str_delay ] = 250;
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// Property: jQuery.resize.throttleWindow
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//
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// Throttle the native window object resize event to fire no more than once
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// every <jQuery.resize.delay> milliseconds. Defaults to true.
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//
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// Because the window object has its own resize event, it doesn't need to be
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// provided by this plugin, and its execution can be left entirely up to the
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// browser. However, since certain browsers fire the resize event continuously
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// while others do not, enabling this will throttle the window resize event,
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// making event behavior consistent across all elements in all browsers.
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//
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// While setting this property to false will disable window object resize
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// event throttling, please note that this property must be changed before any
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// window object resize event callbacks are bound.
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jq_resize[ str_throttle ] = true;
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// Event: resize event
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//
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// Fired when an element's width or height changes. Because browsers only
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// provide this event for the window element, for other elements a polling
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// loop is initialized, running every <jQuery.resize.delay> milliseconds
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// to see if elements' dimensions have changed. You may bind with either
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// .resize( fn ) or .bind( "resize", fn ), and unbind with .unbind( "resize" ).
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//
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// Usage:
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//
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// > jQuery('selector').bind( 'resize', function(e) {
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// > // element's width or height has changed!
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// > ...
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// > });
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//
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// Additional Notes:
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//
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// * The polling loop is not created until at least one callback is actually
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// bound to the 'resize' event, and this single polling loop is shared
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// across all elements.
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//
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// Double firing issue in jQuery 1.3.2:
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//
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// While this plugin works in jQuery 1.3.2, if an element's event callbacks
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// are manually triggered via .trigger( 'resize' ) or .resize() those
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// callbacks may double-fire, due to limitations in the jQuery 1.3.2 special
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// events system. This is not an issue when using jQuery 1.4+.
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//
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// > // While this works in jQuery 1.4+
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// > $(elem).css({ width: new_w, height: new_h }).resize();
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// >
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// > // In jQuery 1.3.2, you need to do this:
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// > var elem = $(elem);
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// > elem.css({ width: new_w, height: new_h });
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// > elem.data( 'resize-special-event', { width: elem.width(), height: elem.height() } );
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// > elem.resize();
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$.event.special[ str_resize ] = {
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// Called only when the first 'resize' event callback is bound per element.
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setup: function() {
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// Since window has its own native 'resize' event, return false so that
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// jQuery will bind the event using DOM methods. Since only 'window'
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// objects have a .setTimeout method, this should be a sufficient test.
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// Unless, of course, we're throttling the 'resize' event for window.
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if ( !jq_resize[ str_throttle ] && this[ str_setTimeout ] ) { return false; }
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var elem = $(this);
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// Add this element to the list of internal elements to monitor.
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elems = elems.add( elem );
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// Initialize data store on the element.
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$.data( this, str_data, { w: elem.width(), h: elem.height() } );
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// If this is the first element added, start the polling loop.
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if ( elems.length === 1 ) {
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loopy();
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}
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},
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// Called only when the last 'resize' event callback is unbound per element.
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teardown: function() {
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// Since window has its own native 'resize' event, return false so that
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// jQuery will unbind the event using DOM methods. Since only 'window'
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// objects have a .setTimeout method, this should be a sufficient test.
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// Unless, of course, we're throttling the 'resize' event for window.
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if ( !jq_resize[ str_throttle ] && this[ str_setTimeout ] ) { return false; }
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var elem = $(this);
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// Remove this element from the list of internal elements to monitor.
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elems = elems.not( elem );
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// Remove any data stored on the element.
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elem.removeData( str_data );
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// If this is the last element removed, stop the polling loop.
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if ( !elems.length ) {
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clearTimeout( timeout_id );
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}
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},
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// Called every time a 'resize' event callback is bound per element (new in
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// jQuery 1.4).
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add: function( handleObj ) {
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// Since window has its own native 'resize' event, return false so that
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// jQuery doesn't modify the event object. Unless, of course, we're
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// throttling the 'resize' event for window.
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if ( !jq_resize[ str_throttle ] && this[ str_setTimeout ] ) { return false; }
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var old_handler;
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// The new_handler function is executed every time the event is triggered.
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// This is used to update the internal element data store with the width
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// and height when the event is triggered manually, to avoid double-firing
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// of the event callback. See the "Double firing issue in jQuery 1.3.2"
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// comments above for more information.
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function new_handler( e, w, h ) {
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var elem = $(this),
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data = $.data( this, str_data );
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// If called from the polling loop, w and h will be passed in as
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// arguments. If called manually, via .trigger( 'resize' ) or .resize(),
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// those values will need to be computed.
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data.w = w !== undefined ? w : elem.width();
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data.h = h !== undefined ? h : elem.height();
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old_handler.apply( this, arguments );
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};
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// This may seem a little complicated, but it normalizes the special event
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// .add method between jQuery 1.4/1.4.1 and 1.4.2+
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if ( $.isFunction( handleObj ) ) {
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// 1.4, 1.4.1
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old_handler = handleObj;
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return new_handler;
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} else {
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// 1.4.2+
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old_handler = handleObj.handler;
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handleObj.handler = new_handler;
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}
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}
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};
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function loopy() {
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// Start the polling loop, asynchronously.
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timeout_id = window[ str_setTimeout ](function(){
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// Iterate over all elements to which the 'resize' event is bound.
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elems.each(function(){
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var elem = $(this),
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width = elem.width(),
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height = elem.height(),
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data = $.data( this, str_data );
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// If element size has changed since the last time, update the element
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// data store and trigger the 'resize' event.
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if ( width !== data.w || height !== data.h ) {
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elem.trigger( str_resize, [ data.w = width, data.h = height ] );
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}
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});
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// Loop.
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loopy();
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}, jq_resize[ str_delay ] );
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};
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})(jQuery,this);
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