iframe contentDocument和contentWindow为null [英] iframe contentDocument and contentWindow is null
问题描述
我正在尝试通过以下代码访问iframe的contentDocument和contentWindow.但是它们都为空.
I am trying to access iframe's contentDocument and contentWindow in following code. But they both are null.
var iframe = document.createElement('iframe');
this.get__domElement$i().appendChild(iframe);
if (iframe.contentDocument) {
iframe.contentDocument.write("Hello");
}
else if (iframe.contentWindow) {
iframe.contentWindow.document.body.innerHTML = "Hello";
}
有人可以告诉我这有什么问题吗?谢谢
Can someone tell me whats wrong in this? Thanks
当我执行Document.Body.AppendChild(iframe)时，contentDocument和contentWindow都不为null.
When i do Document.Body.AppendChild(iframe), then contentDocument and contentWindow are non null.
当我将iframe附加到div时，有人可以告诉我怎么了吗?
Can someone tell me whats wrong when i append the iframe to div?
非常感谢.
推荐答案
我知道这有点晚了，但是我正在对此进行研究并偶然发现了您的问题:
I know that this is a bit late, but i was researching this and stumbled on your question:
我遇到了与您相同的错误，因为在尝试附加iframe时，我尝试将iframe附加到的div尚未加载.如果加载了div，则您的代码有效:
I got the same error as you, because the div i was trying to append the iframe to wasn't loaded yet when i was trying to append the iframe. If the div is loaded your code works:
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<div id='test' >
</div>
<script>
var iframe = document.createElement('iframe');
var myDiv = document.getElementById('test');
myDiv.appendChild(iframe);
if (iframe.contentDocument) {
iframe.contentDocument.write("Hello");
}
else if (iframe.contentWindow) {
iframe.contentWindow.document.body.innerHTML = "Hello";
}
</script>
</body>
</html>
这是一个 jsFiddle ，其中包含此工作代码和
Here is a jsFiddle with this working code and another with the tag in the giving an error TypeError: Cannot call method 'appendChild' of null .
这篇关于iframe contentDocument和contentWindow为null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！
