Is there a way to transfer CSS classes to React children and guarantee they take precedence over the child's own class styles?

I am trying to pass a CSS class from the parent component into the child component. Here is an example:

<Parent>
    <Child />
</Parent>

In order to apply a class from the parent to the <Child />, I have done this:

<Parent>
    <Child className={ styles.pill } />
</Parent>

The <Child /> uses the className prop and applies the class using the classnames package, like so:

<div className={ classNames(styles.pill, props.className) } />

However, there seems to be a conflict with the styles of the <Child />. The class passed in from the parent and the styles defined within the Child component are causing unpredictable results, with each build of the project.

How can I make sure that the CSS properties from the parent class override any conflicting properties in the Child component?

Answer №1

Understanding CSS specificity is crucial, as it offers various methods to ensure style overrides.

  1. Utilize multiple selectors: To increase specificity, double the selector size by duplicating the class name. For example, using .pill.pill { ...} will be more specific and override the original style.

  2. Use of !important: Add !important at the end of the parent class's declaration, like .pill, to prioritize its styling.

  3. Implement different selectors: Assign additional unique className to the parent component that the child can target, such as .pill.parent-pill {...}. The parent then passes the .parent-pill class to the child for styling.

These are just three simple ways to override child styles, with more options available.

Answer №2

To combine multiple objects into one target object, you can utilize the Object.assign method. This function will prioritize values from the subsequent objects:

const example = { x: '100', y: '200' }
const test = { x: '300' }
console.log(Object.assign(example, test));

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