Customizing CSS variables in a parent component to take precedence

Hey there!

So, I'm currently working on a project involving a small AngularJs component that generates a tag-like unit. Within this component, I've set some basic styles such as colors and borders as default values. The idea is for outer components to be able to customize these styles by altering the CSS variable value. Here's a sample of the setup:

tagLike.html

.tag-like-container {
  --tag-like-color: red;
  
  color: var(--tag-like-color);
 }
 <div class="tag-like-container">
    my tag
 </div>

Subsequently, an outer component will interact with it

outerComponent

.outer-container {
  --tag-like-color: blue;
 }
<div class="outer-container">
  <tag-like></tag-like>
</div>

The issue arises when the final value of --tag-like-color turns out to be red instead of blue, and that’s what I need help with. Any suggestions on how to tackle this?

Thank you!

Answer №1

The problem lies in the fact that you are altering the color without actually assigning a specific color value to the .outer-container element. It is crucial to explicitly state that the .outer-container should utilize the variable for the color.

.outer-container {
    --tag-like-color: blue;
    color: var(--tag-like-color);
 }

Answer №2

discovered the solution! The technique involves utilizing 2 variables, as shown below:

outerComponent

.tag-like-override {
  --tag-like-color: blue;
 }
<tag-like class="tag-like-override"></tag-like>

Within the innerComponent, using the var(value, fallback) model, we can establish

innerComponent

--final-tag-color: var(--tag-like-color, red);
color: var(--final-tag-color);

This method allows for setting a default color by the outer component and having the final value be either the overridden value or the fallback value (in this case, red) if not overridden.

By adopting this approach, it becomes feasible to outline all customizable styles at the highest level of the component, thus creating a self-contained component.

Appreciate all the assistance provided!

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