从主文档中的 JavaScript 获取 IFrame 的文档 [英] Get IFrame's document, from JavaScript in main document
问题描述
我有这个 HTML 代码:
I have this HTML code:
<html>
<head>
<script type="text/javascript">
function GetDoc(x)
{
return x.document ||
x.contentDocument ||
x.contentWindow.document;
}
function DoStuff()
{
var fr = document.all["myframe"];
while(fr.ariaBusy) { }
var doc = GetDoc(fr);
if (doc == document)
alert("Bad");
else
alert("Good");
}
</script>
</head>
<body>
<iframe id="myframe" src="http://example.com" width="100%" height="100%" onload="DoStuff()"></iframe>
</body>
</html>
问题是我收到消息Bad".也就是说iframe的文档没有正确获取，GetDoc函数返回的其实是父文档.
The problem is that I get message "Bad". That mean that the document of iframe is not got correctly, and what is actualy returned by GetDoc function is the parent document.
如果你能告诉我哪里出错了，我将不胜感激.(我想在 IFrame 中托管文档.)
I would be thankful, if you told where I do my mistake. (I want to get document hosted in IFrame.)
谢谢.
推荐答案
您应该能够使用以下代码访问 IFRAME 中的文档:
You should be able to access the document in the IFRAME using the following code:
document.getElementById('myframe').contentWindow.document
但是，如果框架中的页面是从不同的域(例如 google.com)加载的，您将无法执行此操作.这是因为浏览器的同源政策.
However, you will not be able to do this if the page in the frame is loaded from a different domain (such as google.com). THis is because of the browser's Same Origin Policy.
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