为什么html5 postMessage不适合我？ [英] Why is html5 postMessage not working for me?
问题描述
我使用几行javascript来创建iframe元素，然后我想发送一条消息，如下所示：
I use a few lines of javascript to create an iframe element, and then I'd like to send it a message, like this:
function loadiframe (callback) {
var body = document.getElementsByTagName('body')[0];
var iframe = document.createElement('iframe');
iframe.id = 'iframe';
iframe.seamless = 'seamless';
iframe.src = 'http://localhost:3000/iframe.html';
body.appendChild(iframe);
callback();
}
loadiframe(function() {
cpframe = document.getElementById('iframe').contentWindow;
cpframe.postMessage('please get this message','http://localhost:3000');
console.log('posted');
})
然后，在 http：// localhost：3000 / iframe.html （iframe的来源）是这样的：
And then, inside http://localhost:3000/iframe.html (the source of the iframe) is something like this:
<!DOCTYPE html>
<html>
<head>
<title>does not work</title>
<script>
window.addEventListener("message", receiveMessage, false);
function receiveMessage(event) {
if (event.origin == "http://localhost:3000") {
document.write(JSON.stringify(event));
document.write(typeof event);
}
}
</script>
</head>
<body>
</body>
</html>
但没有任何反应......我甚至试图不使用原产地安全检查，但即便如此没有任何反应......就像从来没有得到消息...
But nothing happens... I even tried to not use the safety check for origin, but even like that nothing happens... Like it never got the message...
我是否遇到过某种异常问题？我试图确保在postMessage消失之前加载iframe ...
Am I in some kind of async problem ? I tried to make sure the iframe was loaded before the postMessage went away...
EDIT1：此外，控制台上没有显示错误......
Also, no errors show on the console...
EDIT2：我在谷歌Chrome 11和Firefox 4中试过它
I tried it in Google Chrome 11 and Firefox 4
提前谢谢。
推荐答案
有两个可能的问题：
- 你正在打电话<加载子框架之前code> callback - 在
加载事件中尝试或在中执行此操作setTimeout - 我从来没有设法获得
postMessage来处理其他任何'*'作为起源。如果我在其中放置了一个URL，我会收到安全警告安全错误： http：// xxx / 的内容可能无法加载数据来自 http：// yyy / ，但仅在错误控制台（Ctrl + Shift + J）中，不在任何其他地方。我怀疑还有一些其他东西需要设置才能工作，但我还没弄清楚是什么。
- You're calling
callbackbefore the child frame has loaded - try it in theloadevent or do it in asetTimeout - I've never managed to get
postMessageto work with anything other that '*' as the origin. If I put a URL in there I get a security warning "Security Error: Content at http://xxx/ may not load data from http://yyy/", except only in the error console (Ctrl + Shift + J) not in any other place. I suspect there's some other stuff that needs set up somewhere for that to work, but I've not yet figured out what.
< a href =http://jsfiddle.net/robertc/Bh8jB/ =nofollow>这是一个jsfiddle ，你的代码稍微修改一下，加载了我的域名文档，适用于我的Firefox和Chrome。
Here's a jsfiddle with a slightly modified version of your code loading a document off my domain, works for me in Firefox and Chrome.
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