跨域 Iframe 通信解决方案(兼容 IE 系列浏览器。)
实现思路:
1、postMessage(IE8+, Firefox 3.1+, Opera 9+, Safari, and Chrome)
2、利用window.navigator共享信息,使支持IE6,IE7
i、父窗口向子窗口iframe发送信息:
document.getElementById("childiframe").contentWindow .postMessage( "我是父窗口", "http://child.com:8080" //可以*通配符代替,表示支持所有域 );
上面的代码表示父窗口向子iframe:childiframe,域名为"http://child.com:8080" 发送 "我是父窗口"的消息
ii、子iframe
window.addEventListener("message", function( event ) { // 把父窗口发送过来的数据显示在子窗口中 document.getElementById("content").innerHTML+=event.data+"<br/>"; }, false );
iii、父窗口如果有多个子iframe,那么父窗口可以向多个子窗口发送消息
利用Object-orient-programing ,父窗口和多个子窗口分别实例化一个Message对象,各个窗口的message对象里开辟一个内存可以保存多个目标对象Target,意思是要发送消息到这些目标,
Target对象实现自己的send方法 ,send考虑到浏览器的兼容性,Target对象里保存了target和name信息,target表示要发送的窗口,name是发送目标的名称 ,name的作用仅仅是支持IE6、7中使用到(在window.navigator标示一个唯一send的回调函数)
var prefix = "arale-messenger",
supportPostMessage = 'postMessage' in window;
// Target 类, 消息对象 function Target(target, name){ var errMsg = ''; if(arguments.length < 2){ errMsg = 'target error - target and name are both required'; } else if (typeof target != 'object'){ errMsg = 'target error - target itself must be window object'; } else if (typeof name != 'string'){ errMsg = 'target error - target name must be string type'; } if(errMsg){ throw new Error(errMsg); } this.target = target; this.name = name; } // 往 target 发送消息, 出于安全考虑, 发送消息会带上前缀 if ( supportPostMessage ){ // IE8+ 以及现代浏览器支持 Target.prototype.send = function(msg){ this.target.postMessage(prefix + msg, '*'); }; } else { // 兼容IE 6/7 利用window.navigator共享信息,使支持IE6,IE7 Target.prototype.send = function(msg){ var targetFunc = window.navigator[prefix + this.name]; if ( typeof targetFunc == 'function' ) { targetFunc(prefix + msg, window); } else { throw new Error("target callback function is not defined"); } }; }
iiii: 每个窗口都实例化的Message类:
targets 里保存目标发送对象,name当前窗口的名字,最后会传给Target,也是只在兼容IE6、7中用到。
listenFunc :保存监听的回调,一个页面可以实现多个监听。
initListen :ie6、7中保存全局回调函数,以方便在Target的send中触发
IE8+和现代化浏览器中监听message事件。
// 信使类 // 创建Messenger实例时指定, 必须指定Messenger的名字, (可选)指定项目名, 以避免Mashup类应用中的冲突 // !注意: 父子页面中projectName必须保持一致, 否则无法匹配 function Messenger(messengerName, projectName){ this.targets = {}; this.name = messengerName; this.listenFunc = []; prefix = projectName || prefix; this.initListen(); } // 添加一个消息对象 Messenger.prototype.addTarget = function(target, name){ var targetObj = new Target(target, name); this.targets[name] = targetObj; }; // 初始化消息监听 Messenger.prototype.initListen = function(){ var self = this; var generalCallback = function(msg){ if(typeof msg == 'object' && msg.data){ msg = msg.data; } // 剥离消息前缀 msg = msg.slice(prefix.length); for(var i = 0; i < self.listenFunc.length; i++){ self.listenFunc[i](msg); } }; if ( supportPostMessage ){ if ( 'addEventListener' in document ) { window.addEventListener('message', generalCallback, false); } else if ( 'attachEvent' in document ) { window.attachEvent('onmessage', generalCallback); } } else { // 兼容IE 6/7 window.navigator[prefix + this.name] = generalCallback; } }; // 监听消息 Messenger.prototype.listen = function(callback){ this.listenFunc.push(callback); }; // 注销监听 Messenger.prototype.clear = function(){ this.listenFunc = []; }; // 广播消息 Messenger.prototype.send = function(msg){ var targets = this.targets, target; for(target in targets){ if(targets.hasOwnProperty(target)){ targets[target].send(msg); } } };
完整demo:
完整代码:
message.js
(function(w){ // 消息前缀, 建议使用自己的项目名, 避免多项目之间的冲突 var prefix = "arale-messenger", supportPostMessage = 'postMessage' in window; // Target 类, 消息对象 function Target(target, name){ var errMsg = ''; if(arguments.length < 2){ errMsg = 'target error - target and name are both required'; } else if (typeof target != 'object'){ errMsg = 'target error - target itself must be window object'; } else if (typeof name != 'string'){ errMsg = 'target error - target name must be string type'; } if(errMsg){ throw new Error(errMsg); } this.target = target; this.name = name; } // 往 target 发送消息, 出于安全考虑, 发送消息会带上前缀 if ( supportPostMessage ){ // IE8+ 以及现代浏览器支持 Target.prototype.send = function(msg){ this.target.postMessage(prefix + msg, '*'); }; } else { // 兼容IE 6/7 Target.prototype.send = function(msg){ var targetFunc = window.navigator[prefix + this.name]; if ( typeof targetFunc == 'function' ) { targetFunc(prefix + msg, window); } else { throw new Error("target callback function is not defined"); } }; } // 信使类 // 创建Messenger实例时指定, 必须指定Messenger的名字, (可选)指定项目名, 以避免Mashup类应用中的冲突 // !注意: 父子页面中projectName必须保持一致, 否则无法匹配 function Messenger(messengerName, projectName){ this.targets = {}; this.name = messengerName; this.listenFunc = []; prefix = projectName || prefix; this.initListen(); } // 添加一个消息对象 Messenger.prototype.addTarget = function(target, name){ var targetObj = new Target(target, name); this.targets[name] = targetObj; }; // 初始化消息监听 Messenger.prototype.initListen = function(){ var self = this; var generalCallback = function(msg){ if(typeof msg == 'object' && msg.data){ msg = msg.data; } // 剥离消息前缀 msg = msg.slice(prefix.length); for(var i = 0; i < self.listenFunc.length; i++){ self.listenFunc[i](msg); } }; if ( supportPostMessage ){ if ( 'addEventListener' in document ) { window.addEventListener('message', generalCallback, false); } else if ( 'attachEvent' in document ) { window.attachEvent('onmessage', generalCallback); } } else { // 兼容IE 6/7 window.navigator[prefix + this.name] = generalCallback; } }; // 监听消息 Messenger.prototype.listen = function(callback){ this.listenFunc.push(callback); }; // 注销监听 Messenger.prototype.clear = function(){ this.listenFunc = []; }; // 广播消息 Messenger.prototype.send = function(msg){ var targets = this.targets, target; for(target in targets){ if(targets.hasOwnProperty(target)){ targets[target].send(msg); } } }; w["Messenger"]=Messenger; })(window);
child.html:
<!doctype html> <html> <head> <script type="text/javascript" src="message.js"></script> <script> window.onload=function(){ var messenger = new Messenger('iframe1', 'MessengerProject'); messenger.addTarget(window.parent, 'parent'); messenger.targets['parent'].send('发给父页面的消息'); messenger.listen(function(msg) { document.getElementById("msg").innerHTML=msg; }); } </script> </head> <body> child <div id="msg"></div> </body> </html>
parent.html
<!doctype html> <html> <head> <script type="text/javascript" src="message.js"></script> <script> window.onload=function(){ var messenger = new Messenger('parent', 'MessengerProject'); var iframe1=window.iframe1; messenger.addTarget(iframe1.contentWindow, 'iframe1'); messenger.targets['iframe1'].send('发给子页面1的消息'); messenger.listen(function(msg) { document.getElementById("msg").innerHTML=msg; }); } </script> </head> <body> parent <div id="msg"></div> <iframe id="iframe1" src="child.html" width=100 height=100> </body> </html>