Cross-domain IFrame DOM properties access from parent's JavaScript [duplicate]

This question already has answers here: Ways to circumvent the same-origin policy (8 answers) Closed 7 years ago.

There are already a few similar questions but they tend to cover child-to-parent relationship.

I, on the other hand, would like to be able to get some properties of the IFrame's DOM. I don't want to manipulate anything. I only want to be able to read properties or DOM nodes. Things like attributes or contents.

AFAIK this is not possible unless I use something like window.postMessage. As reasonable as this solution it's based on event listeners. This requires a listener to be defined inside the IFrame and this means changing the IFrame's code. I want to avoid that.

If you want to make a cross-domain Ajax call, you can (if you have access too) set target server's headers to al开发者_如何学Golow that:

Access-Control-Allow-Headers:X-Requested-With
Access-Control-Allow-Methods:POST,GET,DELETE,PUT,OPTIONS
Access-Control-Allow-Origin:*

This interestingly enough doesn't work for communication with an IFrame. So my question stands:

(How) can I access cross-domain IFrame's DOM properties?

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I cant even tell you how many times I've ran into problems like this.

Read this community wiki on circumventing the same-origin policy to find a solution that works for you. Its one of the best same-origin resources I've found on the internet.

Alex Sexton of yayQuery also put together a screencast on some different methods

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i would give a shot to http://easyxdm.net/wp/ used it many times, quite easy to use and works in older browsers too