How to resize iframe when parent window resizes

Question

I don't think this is not another "resize iframe according to content height" question.

I actually want to resize the iframe dynamically according to a resize of the parent window. For JS Fiddle fans I have an example here

For those who want to look at the code on SO:

<div id="content">
<iframe src="http://www.apple.com" 
        name="frame2" 
        id="frame2" 
        frameborder="0" 
        marginwidth="0" 
        marginheight="0" 
        scrolling="auto" 
        allowtransparency="false">
</iframe>

</div>

<div id="block"></div>

<div id="header"></div>

<div id="footer"></div>

CSS:

body {
margin: 0px;
padding-top: 78px;
padding-right: 0px;
padding-bottom: 25px;
padding-left: 0px;
min-height: 0px;
height: auto;
text-align: center;
background-color: lightblue;
overflow:hidden;
}

div#header {
top: 0px;
left: 0px;
width: 100%;
height: 85px;
min-width: 1000px;
overflow: hidden;
background-color: darkblue;
}

div#footer {
bottom: 0px;
left: 0px;
width: 100%;
height: 25px;
min-width: 1000px;
background-color: darkblue;
}

iframe#frame2 {

margin: 40px;
position: fixed;
top: 80px;
left: 0px;
width: 200px;
bottom: 25px;
min-width: 200px;
}

div#block {

background-color: lightgreen;
margin: 40px;
position: fixed;
top: 80px;
left: 350px;
width: 200px;
bottom: 25px;
min-width: 200px;
}

@media screen {
body > div#header {
position: fixed;
}
body > div#footer {
position: fixed;
}
}

There may be a bit of odd CSS there - I cobbled it together from the actual page. Apologies.

As you can see the green coloured div dynamically changes height accordingly when you resize the window. What I'd like to find out is if this can be done with the iframe to the left of the div.

Can CSS alone make this happen?

Answer 1

I created a new jsfiddle that gets you what you need in raw css. I didn't test cross-browser extensively, particularly in IE. I would anticipate support in IE8 and 9, but would be hesitant to say that 7 would work without hiccups.

The relevant changes:

    /* This contains the iframe and sets a new stacking context */
div#content {
    position: fixed;
    top: 80px;
    left: 40px;
    bottom: 25px;
    min-width: 200px;
    background: black; 
        /* DEBUG: If the iframe doesn't cover the whole space,
           it'll show through as black. */
}

    /* Position the iframe inside the new stacking context
       to take up the whole space */
div#content iframe {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    height: 100%;
    width: 100%;
}

Answer 2

I think this does what you're after.

First I wrapped the iframe in a div, and set the iframe's width and height to be 100%.

HTML

<div id="frameContainer"><iframe src="http://www.apple.com" name="frame2" id="frame2" frameborder="0" marginwidth="0" marginheight="0" scrolling="auto" onload="" allowtransparency="false"></iframe></div>

CSS

#frameContainer {

    margin: 40px;
    position: fixed;
    top: 80px;
    left: 0px;
    width: 200px;
    bottom: 25px;
    min-width: 200px;

}

iframe#frame2 { width: 100%; height:100% }

Then I added the following jQuery code.

jsFiddle

$(function() {
    var widthRatio = $('#frameContainer').width() / $(window).width();
    $(window).resize(function() {
        $('#frameContainer').css({width: $(window).width() * widthRatio});
    }); 
});