Bootstrap modal at top of iframe regardless of scroll position. How do I position it on screen?

When embedding a Bootstrap app in an iframe, modal dialogs always open at the top of the iframe, not the top of the screen. As an example, go to http://getbootstrap.com/javascript/ and open an example modal on the page. Then using the sample code below which places the same bootstrap page in an iframe, find a modal and open it:

<html>
    <head>
    </head>
    <body>
        <table width="100%">
            <tr><td colspan="2" style="height:80px;background-color:red;vertical-align:top">Here's some header content I don't control</td></tr>
            <tr><td style="width:230px;height:10080px;background-color:red;vertical-align:top">Here's some sidebar content I don't control either</td>
                <td valign="top">
                    <iframe width="100%" height="10000px" 
                        scrolling="no" src="http://getbootstrap.com/javascript/">
                    </iframe>
                </td>
            </tr>
        </table>
    </body>
</html>

Demo in fiddle

How do I go about positioning the modal on the screen in this scenario?

UPDATE: Unfortunately, my iFrame cannot fill the screen, nor can I make it fixed since it needs to blend into the rest of the page and the page itself has enough content to scroll. This is not my design and I ultimately intend to rework the whole thing, but this is what I have to work around for now. As a temporary option, I'm using javascript to tell the iframe parent to scroll to the top where the modal dialog pops up. While this is acceptable, this isn't the desired behavior.

I'm using angularjs and the ui-bootstrap library in my code but as you can see above, it's a bootstrap issue.

Answer

July 17, 2014

KyleMit

This is a bug in most browsers (IE appears fine) where the elements are fixed to the iframe, not the window. Typically, if you need something to be relative to the main document, it has to be in the main document.

A workaround is to wrap your iframe in a fixed position div that takes up the whole width of the screen and then maximize the iframe within that. This appears to resolve the issue

HTML:

<div class="fixframe">
    <iframe src="http://getbootstrap.com/javascript/"></iframe>
</div>

CSS:

.fixframe {
    position: fixed;
    top: 0px;
    left: 0px;
    right: 0px;
    bottom: 0px;    
} 
.fixframe iframe {
   height: 100%;
   width: 100%;  
}

Working Demo in fiddle

See Also: