Proportionally resize iframe to fit in a DIV using jQuery

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I have an iframe of a video inside a div, like so:

    
</div>
</code></pre>

<p>I set the DIV\'s size dynami         
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<p>I have really improved on the answer from @TrueBlueAussie over time, and thought I'd post a more sophisticated answer here for future reference.</p>

<p><strong>Made it a plugin on GitHub here: https://github.com/drewbaker/fitToParent</strong></p>

<p>Here is the jQuery plugin:</p>

<pre><code>jQuery.fn.fitToParent = function (options) {

    this.each(function () {

        // Cache the resize element
        var $el = jQuery(this);

        // Get size parent (box to fit element in)
        var $box;
        if( $el.closest('.size-parent').length ) {
            $box = $el.closest('.size-parent');
        } else {
            $box = $el.parent();
        }

        // These are the defaults.
        var settings = jQuery.extend({  
                height_offset: 0,
                width_offset: 0,
                box_height: $box.height(),
                box_width: $box.width(),
        }, options );

        // Setup box and element widths
        var width = $el.width();
        var height = $el.height();
        var parentWidth = settings.box_width - settings.width_offset;
        var parentHeight = settings.box_height - settings.height_offset;

        // Maintin aspect ratio
        var aspect = width / height;
        var parentAspect = parentWidth / parentHeight;

        // Resize to fit box
        if (aspect &gt; parentAspect) {
            newWidth = parentWidth;
            newHeight = (newWidth / aspect);
        } else {
            newHeight = parentHeight;
            newWidth = newHeight * aspect;
        }

        // Set new size of element
        $el.width(newWidth);
        $el.height(newHeight); 

    });
};
</code></pre>

<p>So, assuming you have HTML of this:</p>

<pre><code>&lt;div id="wrapper"&gt;
    &lt;iframe width="720" height="405" src="//player.vimeo.com/video/19223989"&gt;&lt;/iframe&gt;
&lt;/div&gt;
</code></pre>

<p>The most basic way to call the plugin is like this:</p>

<pre><code>jQuery('#wrapper iframe').fitToParent();
</code></pre>

<p>But I'll often set #wrapper to be close to window height and width, like this:</p>

<pre><code>// Get window height and width
var winHeight = jQuery(window).height();
var winWidth = jQuery(window).width();

// Set wrapper height/width to that of window
jQuery('#wrapper').height(winHeight).width(winWidth);

// Size Iframe
jQuery('#wrapper iframe').fitToParent({
    height_offset: 100, // Put some space around the video
    width_offset: 100, // Put some space around the video
});
</code></pre>

<p>You can also feed in a custom box size to fit the element in, like this:</p>

<pre><code>// Get window height and width
var winHeight = jQuery(window).height();
var winWidth = jQuery(window).width();

// Size element
jQuery('#wrapper iframe').fitToParent({
    height_offset: 100, // Put some space around the video
    width_offset: 100, // Put some space around the video
    box_height: winHeight, // Force use of this box size
    box_width: winWidth // Force use of this box size
});
</code></pre>

<p>I've also added the ability to set a CSS class of "size-parent" to a parent element, and it will then use that parent element for the box size. A full example of that:</p>

<pre><code>// HTML like this
&lt;div id="wrapper" class="size-parent"&gt;
    &lt;div class="media"&gt;
        &lt;iframe width="720" height="405" src="//player.vimeo.com/video/19223989"&gt;&lt;/iframe&gt;
    &lt;/div&gt;
&lt;/div&gt;

// jQuery like this
jQuery('.media iframe').fitToParent();    
</code></pre>

<p>If you don't set a .size-parent, it will fallback to the element parent. If you set the box_height/box_width parameter, then those override everything obviously.   </p>

<p>Now, to show how powerful this can be, try this for a vertically centered, horizontal centered aspect ratio correct iFrame!</p>

<pre><code>// CSS like this
#wrapper {
    text-align: center;
    display: table-cell;
    vertical-align: middle;
}
#wrapper iframe {
    display: inline-block;
}

// HTML like this
&lt;div id="wrapper" class="size-wrapper"&gt;
    &lt;iframe width="720" height="405" src="//player.vimeo.com/video/19223989"&gt;&lt;/iframe&gt;
&lt;/div&gt;

// jQuery like this
// Get window height and width
var winHeight = jQuery(window).height();
var winWidth = jQuery(window).width();

// Size wrapper
jQuery('#wrapper').height( winHeight ).width( winWidth );

// Size element
jQuery('#wrapper iframe').fitToParent({
    height_offset: 200, // Put some space around the video
    width_offset: 200, // Put some space around the video
});

// Fit iFrame to wrapper
jQuery('#wrapper iframe').fitToParent();
</code></pre>

<p>In real life, I wrap the jQuery in a function, and then call that function on window resize for true responsive iFrames!</p>
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<p>here:</p>

<p>http://jsfiddle.net/fFTS8/</p>

<pre><code>  &lt;div id="test" style="width:300px;height:200px;background:red;"&gt;&lt;/div&gt;
  &lt;script src="js/vendor/jquery-1.10.2.min.js"&gt;&lt;/script&gt;
  &lt;script type="text/javascript"&gt;
     jQuery.fn.fitToParent = function()
     {
        var that = this;

        function rezise() {
           that.each(function()
           {
             var a = $(this).width();
             var b = $(this).height();
             var c = $(this).parent().width();
             var d = $(this).parent().height();

             var ab = a/b;
             var cd = c/b;

             var e, f = 0; // e - newWidth, f - newHeight

             if(ab &gt; cd) {
                e = c;
                f = c*b/a;
             } else {
                e = a*d/b;
                f = d;
             }

             $(this).width(e);
             $(this).height(f);
           });
        }

        $(window).resize(function() {
           rezise();
        });
     };
     $('#test').fitToParent();

  &lt;/script&gt;
</code></pre>
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<p>Three issues noted: </p>

<ol>
<li><p>You have an error (trailing quote) in your example:</p>

<p><code>:newWidth'</code></p></li>
<li><p>You need to set the iframe actual height and width attributes and not the style. Styling an iframe size has no effect:</p>

<pre><code>$(this).width(newWidth);
$(this).height(newHeight);
</code></pre></li>
<li><p>the calculation for aspect ratio was wrong (needs to compare ratios to see which way they overlap). Without this not all overlap cases are catered for.</p>

<pre><code>var aspect = width/height;
var parentAspect = parentWidth/parentHeight;
if (aspect &gt; parentAspect)
{
    newWidth  = parentWidth;
    newHeight = newWidth / aspect;
}
else
{
    newHeight = parentHeight;
    newWidth  = newHeight * aspect;
}
</code></pre></li>
</ol>

<p>I also cleaned up the code a little to speed up element access. Each call to jQuery(this) costs cycles.</p>

<h2>JSFiddle here: http://jsfiddle.net/TrueBlueAussie/ZJDkF/8/</h2>

<h2>Updates:</h2>

<p>The jsfiddle now has examples of the 4 different scenarios of overlap and each retains the proportions of the iframe. I also added the window resize you mentioned and made the first div resize dynamically with it to demonstrate.</p>
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