继承.js-父级和iframe之间的jQuery共享
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Used to share between a single instance of jQuery through iFrames. Do note, the iFrame content must originate from the same domain, or this plugin will NOT work as expected.
/*! * jQuery iFrame Inheritance * * Copyright (c) 2009 Eric Garside (http://eric.garside.name) * Dual licensed under: * MIT: http://www.opensource.org/licenses/mit-license.php * GPLv3: http://www.opensource.org/licenses/gpl-3.0.html */ (function($){ // Create a function in the Global Namespace so we can access // it from the iFrame by calling parent.inherit() this.inherit = function(child){ // First, bind a copy of jQuery down into the DOM of the // iFrame, so we can hook in functionality. Things may get // a bit confusing here, as we're creating this function in // the parent, but have to set it up internally to get called // as if it were in the child. child.jQueryInherit = this.parent.jQuery; // Bind a special ready callback binding function, to handle the // scope of responding to the document.ready hook instead of the // parent's document.ready child.jQueryInherit.fn.ready = function( fn ) { // Attach the listeners child.jQueryInherit.hooks.bindReady(); // If the DOM is already ready if (child.jQueryInherit.hooks.isReady) // Simply trigger the callback fn.call( child.document, child.jQueryInherit ); // Otherwise, remember it so we can trigger it later else child.jQueryInherit.hooks.readyList.push( fn ); return this; } // Create a namespace for hooking some functionality to the // iFrame, like document.ready decetion and handling child.jQueryInherit.hooks = { isReady: false, readyBound: false, readyList: [], // Mimic the readyBind() function in the child, so it can // set up the listeners for document.ready bindReady: function(){ if (child.jQueryInherit.hooks.readyBound) return; child.jQueryInherit.hooks.readyBound = true; // Mozilla, Opera, and webkit nightlies support if ( child.document.addEventListener ) { child.document.addEventListener( "DOMContentLoaded", function(){ child.document.removeEventListener( "DOMContentLoaded", arguments.callee, false ); child.jQueryInherit.hooks.ready(); }, false ); // For IE } else if ( child.document.attachEvent ) { // ensure firing before onload, // maybe late but safe also for iframes child.document.attachEvent("onreadystatechange", function(){ if ( child.document.readyState === "complete" ) { child.document.detachEvent( "onreadystatechange", arguments.callee ); child.jQueryInherit.hooks.ready(); } }); // If IE and not an iframe // continually check to see if the document is ready if ( child.document.documentElement.doScroll && child == child.top ) (function(){ if ( child.jQueryInherit.hooks.isReady ) return; try { // If IE is used, use the trick by Diego Perini // http://javascript.nwbox.com/IEContentLoaded/ child.document.documentElement.doScroll("left"); } catch( error ) { setTimeout( arguments.callee, 0 ); return; } // and execute any waiting functions child.jQueryInherit.hooks.ready(); })(); } // A fallback to window.onload, that will always work jQuery.event.add( child, "load", child.jQueryInherit.hooks.ready ); }, // Hook the ready trigger to fire off the hook bindings ready: function(){ // Make sure the DOM is not already loaded if ( !child.jQueryInherit.hooks.isReady ) { // Remember that the DOM is ready child.jQueryInherit.hooks.isReady = true; // If there are functions bound... if ( child.jQueryInherit.hooks.readyList ) { // Execute them all jQuery.each( child.jQueryInherit.hooks.readyList, function(){ this.call( child.document, child.jQueryInherit ); }); // Reset the list of functions child.jQueryInherit.hooks.readyList = null; } // Trigger any bound ready events jQuery(child.document).triggerHandler('ready'); } } }; return child.jQuery = child.$ = function( selector, context ){ // Test and see if we're handling a shortcut bind // for the document.ready function. This occurs when // the selector is a function. Because firefox throws // xpconnect objects around in iFrames, the standard // jQuery.isFunction test returns false negatives. if (selector.constructor.toString().match(/Function/) != null) return child.jQueryInherit.fn.ready( selector ); // Otherwise, just let the jQuery init function handle the rest. Be sure we pass in // proper context of the child document, or we'll never select anything useful. else return child.jQueryInherit.fn.init(selector||this.document, context||this.document); } } })(jQuery); /******* Inside the Child Element ******* * Inside the head of the iFrame Content, you'll need to make a call * to the following inheritance function, to set up jQuery for the * iFrame. The call returns the iFrame's personal jQuery object, which * means it can be used to trigger the document.ready event, helpful * for condensing code. */ parent.inherit(window); // Example of using the inheritance function as document.ready parent.inherit(window)(function(){ alert( jQuery('.someElementInTheiFrameDom').text() ); });
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