How to convert HEX color to rgba with Less compiler?
I have the following code:
@color : #d14836;
.stripes span {
-webkit-background-size: 30px 30px;
-moz-background-size: 30px 30px;
background-size: 30px 30px;
background-image: -webkit-gradient(linear, left top, right bottom,
color-stop(.25, rgba(209, 72, 54, 1)), color-stop(.25, transparent),
color-stop(.5, transparent), color-stop(.5, rgba(209, 72, 54, 1)),
color-stop(.75, rgba(209, 72, 54, 1)), color-stop(.75, transparent),
to(transparent));
I need to convert @color to rgba(209, 72, 54, 1) .
So I need to replace rgba(209, 72, 54, 1) in my code with Less function that generates rgba() value from my @color variable.
How can I do this with Less?
Actually, the LESS language comes with an embedded function called fade . You pass a color object and the absolute opacity % (higher value means less transparent):
fade(@color, 50%); // return @color with 50% opacity in rgba
If you dont need a alpha key you can simply use the hex representation of the color. A rgba color with a alpha of '1' is the same as the hex value. Here are some examples to demonstrate that:
@baseColor: #d14836;
html {
color: @baseColor;
//color:#d14836;
}
body {
color: rgba(red(@baseColor), green(@baseColor), blue(@baseColor), 1);
//color:#d14836;
}
div {
color: rgba(red(@baseColor), green(@baseColor), blue(@baseColor), 0.5);
//rgba(209, 72, 54, 0.5);
}
span {
color: fade(@baseColor, 50%);
//rgba(209, 72, 54, 0.5);
}
h3 {
color: fade(@baseColor, 100%)
//color:#d14836;
}
Test this code online: http://lesstester.com/
My less mixin:
.background-opacity(@color, @opacity) {
@rgba-color: rgba(red(@color), green(@color), blue(@color), @opacity);
background-color: @rgba-color;
// Hack for IE8:
background: none9; // Only IE8
filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d')", argb(@rgba-color),argb(@rgba-color))); // IE9 and down
// Problem: Filter gets applied twice in IE9.
// Solution:
&:not([dummy]) {
filter: progid:DXImageTransform.Microsoft.gradient(enabled='false'); // Only IE9
}
}
Try it.
EDITED: As seen on rgba background with IE filter alternative: IE9 renders both! I added some lines to the mixin.
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