Resize iframe height according to content height in it

chinmay_63700 0
Viewed 115278

I am opening my blog page in my website. The problem is I can give a width to an iframe but the height should be dynamic so that there is no scrollbar in the iframe, and it looks like a single page...

I have tried various JavaScript code to calculate the height of the content but all of them give an access denied permission error and is of no use.

<iframe src="http://bagtheplanet.blogspot.com/" name="ifrm" id="ifrm" width="1024px" ></iframe>

Can we use Ajax to calculate height or maybe using PHP?

iframe php ajax javascript
10 Answers

To directly answer your two subquestions: No, you cannot do this with Ajax, nor can you calculate it with PHP.

What I have done in the past is use a trigger from the iframe'd page in window.onload (NOT domready, as it can take a while for images to load) to pass the page's body height to the parent.

<body onload='parent.resizeIframe(document.body.scrollHeight)'>

Then the parent.resizeIframe looks like this:

function resizeIframe(newHeight)
{
    document.getElementById('blogIframe').style.height = parseInt(newHeight,10) + 10 + 'px';
}

Et voila, you have a robust resizer that triggers once the page is fully rendered with no nasty contentdocument vs contentWindow fiddling :)

Sure, now people will see your iframe at default height first, but this can be easily handled by hiding your iframe at first and just showing a 'loading' image. Then, when the resizeIframe function kicks in, put two extra lines in there that will hide the loading image, and show the iframe for that faux Ajax look.

Of course, this only works from the same domain, so you may want to have a proxy PHP script to embed this stuff, and once you go there, you might as well just embed your blog's RSS feed directly into your site with PHP.

user_180770

You can do this with JavaScript.

document.getElementById('foo').height = document.getElementById('foo').contentWindow.document.body.scrollHeight + "px";
Anders_Svendal_540070

Fitting IFRAME contents is kind of an easy thing to find on Google. Here's one solution:

<script type="text/javascript">
    function autoIframe(frameId) {
       try {
          frame = document.getElementById(frameId);
          innerDoc = (frame.contentDocument) ? frame.contentDocument : frame.contentWindow.document;
          objToResize = (frame.style) ? frame.style : frame;
          objToResize.height = innerDoc.body.scrollHeight + 10;
       }
       catch(err) {
          window.status = err.message;
       }
    }
</script>

This of course doesn't solve the cross-domain problem you are having... Setting document.domain might help if these sites are in the same place. I don't think there is a solution if you are iframe-ing random sites.

Scott_Evernden_113970

Here's my solution to the problem using MooTools which works in Firefox 3.6, Safari 4.0.4 and Internet Explorer 7: 

var iframe_container = $('iframe_container_id');
var iframe_style = {
    height: 300,
    width: '100%'
};
if (!Browser.Engine.trident) {
    // IE has hasLayout issues if iframe display is none, so don't use the loading class
    iframe_container.addClass('loading');
    iframe_style.display = 'none';
}
this.iframe = new IFrame({
    frameBorder: 0,
    src: "http://www.youriframeurl.com/",
    styles: iframe_style,
    events: {
        'load': function() {
            var innerDoc = (this.contentDocument) ? this.contentDocument : this.contentWindow.document;
            var h = this.measure(function(){
                return innerDoc.body.scrollHeight;
            });            
            this.setStyles({
                height: h.toInt(),
                display: 'block'
            });
            if (!Browser.Engine.trident) {
                iframe_container.removeClass('loading');
            }
        }
    }
}).inject(iframe_container);

Style the "loading" class to show an Ajax loading graphic in the middle of the iframe container. Then for browsers other than Internet Explorer, it will display the full height IFRAME once the loading of its content is complete and remove the loading graphic.

user_2622550

Below is my onload event handler.

I use an IFRAME within a jQuery UI dialog. Different usages will need some adjustments. This seems to do the trick for me (for now) in Internet Explorer 8 and Firefox 3.5. It might need some extra tweaking, but the general idea should be clear.

    function onLoadDialog(frame) {
    try {
        var body = frame.contentDocument.body;
        var $body = $(body);
        var $frame = $(frame);
        var contentDiv = frame.parentNode;
        var $contentDiv = $(contentDiv);

        var savedShow = $contentDiv.dialog('option', 'show');
        var position = $contentDiv.dialog('option', 'position');
        // disable show effect to enable re-positioning (UI bug?)
        $contentDiv.dialog('option', 'show', null);
        // show dialog, otherwise sizing won't work
        $contentDiv.dialog('open');

        // Maximize frame width in order to determine minimal scrollHeight
        $frame.css('width', $contentDiv.dialog('option', 'maxWidth') -
                contentDiv.offsetWidth + frame.offsetWidth);

        var minScrollHeight = body.scrollHeight;
        var maxWidth = body.offsetWidth;
        var minWidth = 0;
        // decrease frame width until scrollHeight starts to grow (wrapping)
        while (Math.abs(maxWidth - minWidth) > 10) {
            var width = minWidth + Math.ceil((maxWidth - minWidth) / 2);
            $body.css('width', width);
            if (body.scrollHeight > minScrollHeight) {
                minWidth = width;
            } else {
                maxWidth = width;
            }
        }
        $frame.css('width', maxWidth);
        // use maximum height to avoid vertical scrollbar (if possible)
        var maxHeight = $contentDiv.dialog('option', 'maxHeight')
        $frame.css('height', maxHeight);
        $body.css('width', '');
        // correct for vertical scrollbar (if necessary)
        while (body.clientWidth < maxWidth) {
            $frame.css('width', maxWidth + (maxWidth - body.clientWidth));
        }

        var minScrollWidth = body.scrollWidth;
        var minHeight = Math.min(minScrollHeight, maxHeight);
        // descrease frame height until scrollWidth decreases (wrapping)
        while (Math.abs(maxHeight - minHeight) > 10) {
            var height = minHeight + Math.ceil((maxHeight - minHeight) / 2);
            $body.css('height', height);
            if (body.scrollWidth < minScrollWidth) {
                minHeight = height;
            } else {
                maxHeight = height;
            }
        }
        $frame.css('height', maxHeight);
        $body.css('height', '');

        // reset widths to 'auto' where possible
        $contentDiv.css('width', 'auto');
        $contentDiv.css('height', 'auto');
        $contentDiv.dialog('option', 'width', 'auto');

        // re-position the dialog
        $contentDiv.dialog('option', 'position', position);

        // hide dialog
        $contentDiv.dialog('close');
        // restore show effect
        $contentDiv.dialog('option', 'show', savedShow);
        // open using show effect
        $contentDiv.dialog('open');
        // remove show effect for consecutive requests
        $contentDiv.dialog('option', 'show', null);

        return;
    }

    //An error is raised if the IFrame domain != its container's domain
    catch (e) {
        window.status = 'Error: ' + e.number + '; ' + e.description;
        alert('Error: ' + e.number + '; ' + e.description);
    }
};
Admin1

Try using scrolling=no attribute on the iframe tag. Mozilla also has an overflow-x and overflow-y CSS property you may look into.

In terms of the height, you could also try height=100% on the iframe tag.

user_635230
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