I have a div that I want to have the following characteristics:
I need to use percentages because the object will resize left-right when the browser is resized. I want the object to be resized top-bottom to ensure the object maintains the same aspect ratio.
I don't think there's any way to use pure CSS to do this, but does anyone know of a way? Alternatively, is there an easy JavaScript way to do this? (JQuery is fine.)
In the CSS for the <div>, add a percentage value for padding-bottom and set the position to relative, this will maintain the aspect ratio of the container. The value of the padding determines the aspect ratio. ie 56.25% = 16:9.
Using padding-top to set the height from width. Using position: absolute to put image in the padding space. Using max-height and max-width to make sure the image will not over the parent element. using display:block and margin: auto to center the image.
I figured out how to do this without js, though you need to use a transparent image.
Set up a html structure like:
<div class="rect_container"><img class="rect_image" src="rect_image.png"/>
<div class="rect">Your favorite content here</div>
</div>
Use a AxB transparent png for rect_image where AxB is the aspect ratio.
Meanwhile set up a stylesheet like:
.rect_container {width: 50%; position: relative;}
.rect_image {width: 100%; display: block;}
.rect {width: 100%; height: 100%; position: absolute; left: 0px; top: 0px;}
The important thing here is taking advantage of the fact that images maintain their aspect ratio when resized in one direction. Meanwhile, we need a useable div, so we make the image display as block, wrap it in a div, and put an absolutely positioned div inside that. I distilled this code from something more complicated I actually tested. Works like a charm.
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