获取iframe的文档对象 [英] Getting the document object of an iframe
问题描述
我正在尝试获取一个iframe的文档对象，但是没有一个我已经google的示例似乎有帮助。我的代码如下所示：
I'm trying to get the document object of an iframe, but none of the examples I've googled seem to help. My code looks like this:
<html>
<head>
<script>
function myFunc(){
alert("I'm getting this far");
var doc=document.getElementById("frame").document;
alert("document is undefined: "+doc);
}
</script>
</head>
<body>
<iframe src="http://www.google.com/ncr" id="frame" width="100%" height="100%" onload="myFync()"></iframe>
</body>
</html>
我已经测试过，我能够获取iframe对象，但.document不起作用， .contentDocument也没有，我想我已经测试了一些其他的选项，但是所有这些都返回未定义的，甚至是应该是有效但是不适用于我的例子。所以我已经有了iframe对象，现在我想要的是它的文档对象。我已经在Firefox和Chrome上测试了这个。
I have tested that I am able to obtain the iframe object, but .document doesn't work, neither does .contentDocument and I think I've tested some other options too, but all of them return undefined, even examples that are supposed to have worked but they don't work for me. So I already have the iframe object, now all I want is it's document object. I have tested this on Firefox and Chrome to no avail.
推荐答案
尝试以下
var doc=document.getElementById("frame").contentDocument;
// Earlier versions of IE or IE8+ where !DOCTYPE is not specified
var doc=document.getElementById("frame").contentWindow.document;
注意：AndyE指出， contentWindow 所有主流浏览器都支持，所以这可能是最好的方法。
Note: AndyE pointed out that contentWindow is supported by all major browsers so this may be the best way to go.
- http://help.dottoro.com/ljctglqj.php
注2：在此示例中，您将无法访问文件通过任何方式。原因是您无法访问不同来源的iframe的文档，因为它违反了同源安全策略。
Note2: In this sample you won't be able to access the document via any means. The reason is you can't access the document of an iframe with a different origin because it violates the "Same Origin" security policy
- < a href =http://javascript.info/tutorial/same-origin-security-policy =noreferrer> http://javascript.info/tutorial/same-origin-security-policy
- http://javascript.info/tutorial/same-origin-security-policy
这篇关于获取iframe的文档对象的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
