What is the process for converting a hexadecimal color to rgba when using the Less compiler?

Here's the code snippet I'm working with:

@shade : #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 am looking to replace rgba(209, 72, 54, 1) in my code with a function in Less that will dynamically generate an rgba() value based on my @shade variable.

Any suggestions on how I can achieve this using Less?

cssless

Answer №1

One interesting feature of the Less language is the built-in function known as fade. This function allows you to input a color object and specify the absolute opacity percentage (where a higher value indicates less transparency):

fade(@color, 50%);   // Returns @color with 50% opacity in rgba

Answer №2

If you don't require an alpha key, you can opt to simply utilize the hexadecimal representation of the color. A rgba color with an alpha of '1' is equivalent to the hexadecimal value.

Below are some instances to illustrate this:

@primaryColor: #d14836;

html {
    color: @primaryColor;
    /* color:#d14836; */
}

body {
    color: rgba(red(@primaryColor), green(@primaryColor), blue(@primaryColor), 1);
    /* color:#d14836; */
}

div {
    color: rgba(red(@primaryColor), green(@primaryColor), blue(@primaryColor), 0.5);
    /* rgba(209, 72, 54, 0.5); */
}

span {
    color: fade(@primaryColor, 50%);
    /* rgba(209, 72, 54, 0.5); */
}

h3 {
    color: fade(@primaryColor, 100%)
    /* color:#d14836; */
}

Feel free to test this code online:

Answer №3

Snippet of my custom Less mixin:

.background-opacity(@color, @opacity) {
    @rgba-color: rgba(red(@color), green(@color), blue(@color), @opacity);

    background-color: @rgba-color;

    // IE8 compatibility hack:
    background: none\9; 
    filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d')", argb(@rgba-color),argb(@rgba-color))); 
    // Avoiding double application of filter in IE9
    &:not([dummy]) {
      filter: progid:DXImageTransform.Microsoft.gradient(enabled='false'); 
    }
}

Give it a try.

UPDATED: While referring to rgba background with IE filter alternative: IE9 renders both!, I made some adjustments to the mixin.

Answer №4

After updating to the latest version of Less 3.81, I discovered that the rgba() function now only requires two arguments.

rgba(white, 0.3) or rgba(white, 30%) => rgba(255, 255, 255, 0.3)

Although this new feature works perfectly for me, it seems to be missing from the official documentation.

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