Javascript – HTML5 video fit width OR height

htmljavascriptvideo

The width=100% height="auto" scales my videos to fit the whole width of the browser window, but if the height of the window is lower than the aspect ratio the video gets cropped in height.

I want the video to scale to fit either width or height so that I can always see the whole video without crop, filling the closest ratio (adding empty space to sides if window ratio is lower).

I can't figure out how to do this however.
First any height value, % or px, seems to be disregarded, I can't set the size at all using height, only width. Same for min-width/height.

How can this be done?

My code:

<video id="video" width=100% height="auto" onclick=playPause()></video>

Video is loaded by javascript where v is a video link from an array:

video.addEventListener('play', function() { v.play();}, false);

Best Answer

Try wrapping the value inside quotes

<div class="videoContainer">
   <video id="video" width="100%" height="auto" onclick="playPause();"></video>
</div>

you can add these class

.videoContainer
{
   position:absolute;
   height:100%;
   width:100%;
    overflow: hidden;
}

.videoContainer video
{
  min-width: 100%;
  min-height: 100%;
}

Or alternatively use this

video {
  object-fit: cover;
}

2015 update: the flexbox approach

There are two other answers briefly mentioning flexbox; however, that was more than two years ago, and they don't provide any examples. The specification for flexbox has definitely settled now.

Note: Though CSS Flexible Boxes Layout specification is at the Candidate Recommendation stage, not all browsers have implemented it. WebKit implementation must be prefixed with -webkit-; Internet Explorer implements an old version of the spec, prefixed with -ms-; Opera 12.10 implements the latest version of the spec, unprefixed. See the compatibility table on each property for an up-to-date compatibility status.

(taken from https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Flexible_boxes)

All major browsers and IE11+ support Flexbox. For IE 10 or older, you can use the FlexieJS shim.

To check current support you can also see here: http://caniuse.com/#feat=flexbox

Working example

With flexbox you can easily switch between any of your rows or columns either having fixed dimensions, content-sized dimensions or remaining-space dimensions. In my example I have set the header to snap to its content (as per the OPs question), I've added a footer to show how to add a fixed-height region and then set the content area to fill up the remaining space.

html,
body {
  height: 100%;
  margin: 0;
}

.box {
  display: flex;
  flex-flow: column;
  height: 100%;
}

.box .row {
  border: 1px dotted grey;
}

.box .row.header {
  flex: 0 1 auto;
  /* The above is shorthand for:
  flex-grow: 0,
  flex-shrink: 1,
  flex-basis: auto
  */
}

.box .row.content {
  flex: 1 1 auto;
}

.box .row.footer {
  flex: 0 1 40px;
}

<!-- Obviously, you could use HTML5 tags like `header`, `footer` and `section` -->

<div class="box">
  <div class="row header">
    <p><b>header</b>
      <br />
      <br />(sized to content)</p>
  </div>
  <div class="row content">
    <p>
      <b>content</b>
      (fills remaining space)
    </p>
  </div>
  <div class="row footer">
    <p><b>footer</b> (fixed height)</p>
  </div>
</div>

In the CSS above, the flex property shorthands the flex-grow, flex-shrink, and flex-basis properties to establish the flexibility of the flex items. Mozilla has a good introduction to the flexible boxes model.

Javascript – How to retrieve an HTML element’s actual width and height

You should use the .offsetWidth and .offsetHeight properties. Note they belong to the element, not .style.

var width = document.getElementById('foo').offsetWidth;

Function .getBoundingClientRect() returns dimensions and location of element as floating-point numbers after performing CSS transforms.

> console.log(document.getElementById('id').getBoundingClientRect())
DOMRect {
    bottom: 177,
    height: 54.7,
    left: 278.5,
    right: 909.5,
    top: 122.3,
    width: 631,
    x: 278.5,
    y: 122.3,
}

Best Answer

Related Solutions

Html – Make a div fill the height of the remaining screen space

2015 update: the flexbox approach

Working example

Javascript – How to retrieve an HTML element’s actual width and height

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