如何使用 document.getElementById 挑选 iframe 内部的元素

我有这样的 iframe

<iframe name="myframe1" id="myframe1" width="100%" height="100%" src="a.html">
<html>
<head></head>
<frameset name="myframe2" cols="0%, 100%" border="0" frameBorder="0" frameSpacing="0">
<frame name="page1" src="c.html" scrolling="no"></frame>
<frame name="page2" src="d.html" >
<html>
<head></head>
<body id="top">
<div id="div1">
<div id="div2">
<div id="div3">
<ul id="x">
<li>a</li>
<li>b</li>
</ul>
</div>
</div>
</div>
</body>
</html>


</frame>


</frameset>
</html>
</iframe>

我想引用元素“ x”，我尝试了几种方法，但都没有找到解决办法。

201394 次浏览
小开
最佳答案 
document.getElementById('myframe1').contentWindow.document.getElementById('x')

Fiddle

contentWindow is supported by all browsers including the older versions of IE.

Note that if the iframe's src is from another domain, you won't be able to access its content due to the Same Origin Policy.

小开

use contentDocument to achieve this

var iframe = document.getElementById('iframeId');
var innerDoc = (iframe.contentDocument)
? iframe.contentDocument
: iframe.contentWindow.document;


var ulObj = innerDoc.getElementById("ID_TO_SEARCH");
小开

(this is to add to the chosen answer)

Make sure the iframe is loaded before you

contentWindow.document

Otherwise, your getElementById will be null.

PS: Can't comment, still low reputation to comment, but this is a follow-up on the chosen answer as I've spent some good debugging time trying to figure out I should force the iframe load before selecting the inner-iframe element.

小开

In my case I was trying to grab pdfTron toolbar, but unfortunately its ID changes every-time you refresh the page.

So, I ended up grabbing it with this one-liner:

const pdfToolbar = document.getElementsByTagName('iframe')[0].contentWindow.document.getElementById('HeaderItems');

As in the array written by tagName you will always have the fixed index for iFrames in your application.

小开

You need to make sure the frame is fully loaded the best way to do it is to use onload:

<iframe id="nesgt" src="" onload="custom()"></iframe>


function custom(){
document.getElementById("nesgt").contentWindow.document;
}

this function will run automatically when the iframe is fully loaded.


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