CSS: Keeping a div's height relative to its width [duplicate]

问题

My question is very similar to this question: CSS: 100% width or height while keeping aspect ratio?

I have a div whose position is fixed. The width of the div must be 100% and its height exactly 1/6th of its width. Is there a -webkit-calc() way of doing this?

Note: JS solutions are not preferred as a zoom/orientation change can affect the width/height.

回答1:

Is this what you are after? I'm not using -webkit-calc() at all. I've inserted a 1px by 6px image into a outer div which has position: fixed applied to it, and set the image to have a width of 100% and position: relative. Then I have added an inner div which is absolutely positioned to be as high and wide as its ancestor.

Now you can change the width of the outer div, and the images' width: 100% setting will ensure that both the outer and the inner div's are guaranteed to always have a height equal to 1/6th of their width (or at least as close to exactly equal as it can get, the heights will be rounded off to the closest whole number of pixels). Any content could go inside the inner div.

HTML

<div>
  <div></div>
  <img src="https://dl.dropboxusercontent.com/u/6928212/sixbyone.png" />
</div>

CSS

html, body {
  margin: 0px;
  padding: 0px;
}
div {
  position: fixed;
  width: 100%;
}
div > div {
  position: absolute;
  top: 0px;
  right: 0px;
  bottom: 0px;
  left: 0px;      
}
img {
  width: 100%;
  display: block;      
  position: relative;
}

Here's a jsFiddle showing the requested behaviour.

回答2:

You can also use the solution I described in Responsive square columns.

It is based on the fact that % padding-top/bottom and margin-top/bottom are calculated according to the whidth of the parent element.

Adapted to your situation it would look like this :

FIDDLE

HTML :

<div class="wrap">
    <div class="content">
    </div>
</div>

CSS :

.wrap{
    position:fixed;
    width:100%;
    padding-bottom:16.666%; /*  100x1/6 = 16.666...*/
}
.content{
    position:absolute;
    top:0;
    bottom:0;
    left:0;
    right:0;
}

回答3:

you can always set div width like this:

$('#div1').css("width", $('#div1').height()/6);

EDIT:

or you could use something like this:

/* Firefox */
width: -moz-calc(100% / 6);
/* WebKit */
width: -webkit-calc(100% / 6);
/* Opera */
width: -o-calc(100% / 6);
/* Standard */
width: calc(100% / 6);

This is only an example-..But it is impossible to get height of a div in a pixels in the css file..you need to use jquery for that

EDIT:

height 1/6 of a width

$('#div1').css("height", window.width()/6);

回答4:

you could use jquery, e.g.$('.someclass').css('width', 180); $('.someclass').css('height', $('.someclass').width() / 6);

moved the second suggestion from the comment for readability

$('.btnResize').click(function() { $('.div').css('height', $('.div').width()/6);});

来源：https://stackoverflow.com/questions/16539362/css-keeping-a-divs-height-relative-to-its-width

标签

javascript

css

html5

responsive-design

aspect-ratio