Accessing Elements Inside iframe and body Tags with JavaScript

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I\'m writing a GreaseMonkey script that modifies an attribute of an element with a specific ID, but I\'m having some problems accessing it due to a nontraditional HTML hiera

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2条回答

梦谈多话

2020-12-19 16:57

The best way, IMO, to do this is to listen for the load event fired by the iFrame, then look into the iFrame DOM as need. This guarantees that you'll have the iFrame DOM available when you need it and take a while shot.

$('#iframeID').on('load', function ()
{
  alert('loaded'); // iFrame successfully loaded
  var iFrameDoc = $('#iframeID')[0].contentDocument; // Get the iFrame document
  $('body', iFrameDoc).attr('attribute', 'new value'); // Get the 'body' in the iFrame document and set 'attribute' to 'new value'
});

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暗喜

2020-12-19 17:01
You first need to pull the document of the <iframe>:
```
document.getElementById('iframeID').contentDocument
.getElementById('bodyID').setAttribute("attribute","value");
```
Live DEMO

BTW, if you want to get the <body> node, you don't need to give id or something like that, simply:
```
document.body
```
In your case, it's the document of the <iframe>:
```
document.getElementById('iframeID').contentDocument.body.setAttribute("attribute","value");
```
A lot simpler... Isn't it?
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