Why does Bootstrap v4 distinguish between theme-color and standard color variables?

Bootstrap v4.0.0.beta.2 introduces color maps allowing the use of theme-color("primary") instead of $brand-primary.

If I am adding my own custom CSS and want to utilize Bootstrap colors, what is the benefit of using the theme-color function over directly using variables like $primary?

The bootstrap variables file includes:

$primary:       $blue !default;
$secondary:     $gray-600 !default;
$success:       $green !default;
$info:          $cyan !default;
$warning:       $yellow !default;
$danger:        $red !default;
$light:         $gray-100 !default;
$dark:          $gray-800 !default;

$theme-colors: () !default;
$theme-colors: map-merge((
  "primary":    $primary,
  "secondary":  $secondary,
  "success":    $success,
  "info":       $info,
  "warning":    $warning,
  "danger":     $danger,
  "light":      $light,
  "dark":       $dark
), $theme-colors);

Is there any specific reason for not just using $primary or $gray-300 directly?

I do not have any complex SASS processes in my custom file, just plain CSS utilizing these variables.

csstwitter-bootstrapsassbootstrap-4

Answer №1

theme-colors() is mainly used by Bootstrap internally to cycle through all of the theme colors. Various components such as buttons, badges, alerts, etc., have predefined styles in CSS for each theme color. Instead of manually defining styles for each color like this...

   .badge-danger {
        @include badge-variant($danger);
   }
   .badge-warning {
        @include badge-variant($warning);
   }
   ...(repeat for each color)

A simpler approach would be to use...

@each $color, $value in $theme-colors {
  .badge-#{$color} {
    @include badge-variant($value);
  }
}

This method also facilitates extending or customizing Bootstrap (like this, for example) with new elements that require all theme colors.

However, if you're not using complex SASS techniques and sticking to standard CSS with predefined variables, it's easiest to reference the color variables directly...

$primary, $gray-300, etc...

For more information: How to change the bootstrap primary color?

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