FitVids jQuery Plugin

https://github.com/davatron5000/FitVids.js

How To: Include jQuery 1.7+ and FitVids.js in your layout and target your videos container with fitVids().

<script src="path/to/jquery.min.js"></script>
<script src="path/to/jquery.fitvids.js"></script>
<script>
  $(document).ready(function(){
    // Target your .container, .wrapper, .post, etc.
    $("#thing-with-videos").fitVids();
  });
</script>

/*!
* FitVids 1.1
*
* Copyright 2013, Chris Coyier - http://css-tricks.com + Dave Rupert - http://daverupert.com
* Credit to Thierry Koblentz - http://www.alistapart.com/articles/creating-intrinsic-ratios-for-video/
* Released under the WTFPL license - http://sam.zoy.org/wtfpl/
*
*/
!function(t){"use strict";t.fn.fitVids=function(e){var i={customSelector:null,ignore:null};if(!document.getElementById("fit-vids-style")){var r=document.head||document.getElementsByTagName("head")[0],a=".fluid-width-video-wrapper{width:100%;position:relative;padding:0;}.fluid-width-video-wrapper iframe,.fluid-width-video-wrapper object,.fluid-width-video-wrapper embed {position:absolute;top:0;left:0;width:100%;height:100%;}",d=document.createElement("div");d.innerHTML='<p>x</p><style id="fit-vids-style">'+a+"</style>",r.appendChild(d.childNodes[1])}return e&&t.extend(i,e),this.each(function(){var e=['iframe[src*="player.vimeo.com"]','iframe[src*="youtube.com"]','iframe[src*="youtube-nocookie.com"]','iframe[src*="kickstarter.com"][src*="video.html"]',"object","embed"];i.customSelector&&e.push(i.customSelector);var r=".fitvidsignore";i.ignore&&(r=r+", "+i.ignore);var a=t(this).find(e.join(","));a=a.not("object object"),a=a.not(r),a.each(function(e){var i=t(this);if(!(i.parents(r).length>0||"embed"===this.tagName.toLowerCase()&&i.parent("object").length||i.parent(".fluid-width-video-wrapper").length)){i.css("height")||i.css("width")||!isNaN(i.attr("height"))&&!isNaN(i.attr("width"))||(i.attr("height",9),i.attr("width",16));var a="object"===this.tagName.toLowerCase()||i.attr("height")&&!isNaN(parseInt(i.attr("height"),10))?parseInt(i.attr("height"),10):i.height(),d=isNaN(parseInt(i.attr("width"),10))?i.width():parseInt(i.attr("width"),10),o=a/d;if(!i.attr("id")){var h="fitvid"+e;i.attr("id",h)}i.wrap('<div class="fluid-width-video-wrapper"></div>').parent(".fluid-width-video-wrapper").css("padding-top",100*o+"%"),i.removeAttr("height").removeAttr("width")}})})}}(window.jQuery||window.Zepto);

Add Your Own Video Vendor

Have a custom video player? We now have a customSelector option where you can add your own specific video vendor selector (mileage may vary depending on vendor and fluidity of player):

 $("#thing-with-videos").fitVids({ customSelector: "iframe[src^='http://mycoolvideosite.com'], iframe[src^='http://myviiids.com']"});
 // Selectors are comma separated, just like CSS

Note: This will be the quickest way to add your own custom vendor as well as test your player's compatibility with FitVids. Ignore With Class

Have a video you want FitVids to ignore? You can slap a class of fitvidsignore on your object or container and your video will be displayed as it is defined.

If you'd like to add a custom block to ignore FitVids, use the ignore option.

 $("#thing-with-videos").fitVids({ ignore: '.mycooldiv, #myviiid'});
 // Selectors are comma separated, just like CSS

Target Videos embedded without classes or containers

Customers/clients will occasionally add a video to a general content area or article and this may be without a class or container that you're targetting. A solution to this is to target the parent of videos, using something like the below;

 $('iframe[src*="youtube"]').parent().fitVids();
 // You can change the selector to suit potential video providers, or chain them if your customer is likely to use more than one provider

By targetting the iframe/embed parent you can then dynamically add in the fitVids special sauce on the fly without needing to know the container ahead of time. Known issues

   Vimeo Autoplay API is not compatible with FitVids in IE11. You must manually wrap videos you want to autoplay.