1/*! Copyright (c) 2008 Brandon Aaron (http://brandonaaron.net) 2 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) 3 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses. 4 * 5 * Version: 1.0.3 6 * Requires jQuery 1.1.3+ 7 * Docs: http://docs.jquery.com/Plugins/livequery 8 */ 9 10(function($) { 11 12$.extend($.fn, { 13 livequery: function(type, fn, fn2) { 14 var self = this, q; 15 16 // Handle different call patterns 17 if ($.isFunction(type)) 18 fn2 = fn, fn = type, type = undefined; 19 20 // See if Live Query already exists 21 $.each( $.livequery.queries, function(i, query) { 22 if ( self.selector == query.selector && self.context == query.context && 23 type == query.type && (!fn || fn.$lqguid == query.fn.$lqguid) && (!fn2 || fn2.$lqguid == query.fn2.$lqguid) ) 24 // Found the query, exit the each loop 25 return (q = query) && false; 26 }); 27 28 // Create new Live Query if it wasn't found 29 q = q || new $.livequery(this.selector, this.context, type, fn, fn2); 30 31 // Make sure it is running 32 q.stopped = false; 33 34 // Run it immediately for the first time 35 q.run(); 36 37 // Contnue the chain 38 return this; 39 }, 40 41 expire: function(type, fn, fn2) { 42 var self = this; 43 44 // Handle different call patterns 45 if ($.isFunction(type)) 46 fn2 = fn, fn = type, type = undefined; 47 48 // Find the Live Query based on arguments and stop it 49 $.each( $.livequery.queries, function(i, query) { 50 if ( self.selector == query.selector && self.context == query.context && 51 (!type || type == query.type) && (!fn || fn.$lqguid == query.fn.$lqguid) && (!fn2 || fn2.$lqguid == query.fn2.$lqguid) && !this.stopped ) 52 $.livequery.stop(query.id); 53 }); 54 55 // Continue the chain 56 return this; 57 } 58}); 59 60$.livequery = function(selector, context, type, fn, fn2) { 61 this.selector = selector; 62 this.context = context || document; 63 this.type = type; 64 this.fn = fn; 65 this.fn2 = fn2; 66 this.elements = []; 67 this.stopped = false; 68 69 // The id is the index of the Live Query in $.livequery.queries 70 this.id = $.livequery.queries.push(this)-1; 71 72 // Mark the functions for matching later on 73 fn.$lqguid = fn.$lqguid || $.livequery.guid++; 74 if (fn2) fn2.$lqguid = fn2.$lqguid || $.livequery.guid++; 75 76 // Return the Live Query 77 return this; 78}; 79 80$.livequery.prototype = { 81 stop: function() { 82 var query = this; 83 84 if ( this.type ) 85 // Unbind all bound events 86 this.elements.unbind(this.type, this.fn); 87 else if (this.fn2) 88 // Call the second function for all matched elements 89 this.elements.each(function(i, el) { 90 query.fn2.apply(el); 91 }); 92 93 // Clear out matched elements 94 this.elements = []; 95 96 // Stop the Live Query from running until restarted 97 this.stopped = true; 98 }, 99 100 run: function() { 101 // Short-circuit if stopped 102 if ( this.stopped ) return; 103 var query = this; 104 105 var oEls = this.elements, 106 els = $(this.selector, this.context), 107 nEls = els.not(oEls); 108 109 // Set elements to the latest set of matched elements 110 this.elements = els; 111 112 if (this.type) { 113 // Bind events to newly matched elements 114 nEls.bind(this.type, this.fn); 115 116 // Unbind events to elements no longer matched 117 if (oEls.length > 0) 118 $.each(oEls, function(i, el) { 119 if ( $.inArray(el, els) < 0 ) 120 $.event.remove(el, query.type, query.fn); 121 }); 122 } 123 else { 124 // Call the first function for newly matched elements 125 nEls.each(function() { 126 query.fn.apply(this); 127 }); 128 129 // Call the second function for elements no longer matched 130 if ( this.fn2 && oEls.length > 0 ) 131 $.each(oEls, function(i, el) { 132 if ( $.inArray(el, els) < 0 ) 133 query.fn2.apply(el); 134 }); 135 } 136 } 137}; 138 139$.extend($.livequery, { 140 guid: 0, 141 queries: [], 142 queue: [], 143 running: false, 144 timeout: null, 145 146 checkQueue: function() { 147 if ( $.livequery.running && $.livequery.queue.length ) { 148 var length = $.livequery.queue.length; 149 // Run each Live Query currently in the queue 150 while ( length-- ) 151 $.livequery.queries[ $.livequery.queue.shift() ].run(); 152 } 153 }, 154 155 pause: function() { 156 // Don't run anymore Live Queries until restarted 157 $.livequery.running = false;
158 }, 159 160 play: function() { 161 // Restart Live Queries 162 $.livequery.running = true; 163 // Request a run of the Live Queries 164 $.livequery.run(); 165 }, 166 167 registerPlugin: function() { 168 $.each( arguments, function(i,n) { 169 // Short-circuit if the method doesn't exist 170 if (!$.fn[n]) return; 171 172 // Save a reference to the original method 173 var old = $.fn[n]; 174 175 // Create a new method 176 $.fn[n] = function() { 177 // Call the original method 178 var r = old.apply(this, arguments); 179 180 // Request a run of the Live Queries 181 $.livequery.run(); 182 183 // Return the original methods result 184 return r; 185 } 186 }); 187 }, 188 189 run: function(id) { 190 if (id != undefined) { 191 // Put the particular Live Query in the queue if it doesn't already exist 192 if ( $.inArray(id, $.livequery.queue) < 0 ) 193 $.livequery.queue.push( id ); 194 } 195 else 196 // Put each Live Query in the queue if it doesn't already exist 197 $.each( $.livequery.queries, function(id) { 198 if ( $.inArray(id, $.livequery.queue) < 0 ) 199 $.livequery.queue.push( id ); 200 }); 201 202 // Clear timeout if it already exists 203 if ($.livequery.timeout) clearTimeout($.livequery.timeout); 204 // Create a timeout to check the queue and actually run the Live Queries 205 $.livequery.timeout = setTimeout($.livequery.checkQueue, 20); 206 }, 207 208 stop: function(id) { 209 if (id != undefined) 210 // Stop are particular Live Query 211 $.livequery.queries[ id ].stop(); 212 else 213 // Stop all Live Queries 214 $.each( $.livequery.queries, function(id) { 215 $.livequery.queries[ id ].stop(); 216 }); 217 } 218}); 219 220// Register core DOM manipulation methods 221$.livequery.registerPlugin('append', 'prepend', 'after', 'before', 'wrap', 'attr', 'removeAttr', 'addClass', 'removeClass', 'toggleClass', 'empty', 'remove'); 222 223// Run Live Queries when the Document is ready 224$(function() { $.livequery.play(); }); 225 226 227// Save a reference to the original init method 228var init = $.prototype.init; 229 230// Create a new init method that exposes two new properties: selector and context 231$.prototype.init = function(a,c) { 232 // Call the original init and save the result 233 var r = init.apply(this, arguments); 234 235 // Copy over properties if they exist already 236 if (a && a.selector) 237 r.context = a.context, r.selector = a.selector; 238 239 // Set properties 240 if ( typeof a == 'string' ) 241 r.context = c || document, r.selector = a; 242 243 // Return the result 244 return r; 245}; 246 247// Give the init function the jQuery prototype for later instantiation (needed after Rev 4091) 248$.prototype.init.prototype = $.prototype; 249 250})(se$);
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