Scoping Styles in Vue.js

In Vue, we can scope styles to a specific component using various methods.

This helps prevent style conflicts between different components and keeps style modules encapsulated.

Use Cases of Scoping Style

Component-specific Styling: Scoping styles to individual components is useful when preventing style from applying to other parts of the application, maintaining encapsulation and modularity.
Preventing Style Conflicts: Scoped styles prevent conflicts between styles defined in different components, improving maintainability and reducing debugging efforts.
Improved Modularity: Using encapsulating styles within components, we can create reusable and modular components that are easier to maintain and refactor.

Scoped Styles:

Vue.js allows us to scope styles directly to a component by using the scoped attribute in the

Example:

<template>
  <div class="app">
    <h1 class="title">
      Hello World
   </h1>
  </div>
</template>

<style scoped>
.title {
  color: red;
}
</style>

When using scoped styles, Vue automatically generates unique attribute selectors for each class and ensures that the styles only apply to elements within the component's template.

CSS Modules:

CSS Modules is a technique for scoping CSS by automatically generating unique class names for each component.

When we use CSS Modules, the styles are scoped to the component, and there's no risk of styles leaking out or colliding with other components within an application.

Example:

<template>
  <div class="app">
    <h1 class="title">
      Hello World
    </h1>
  </div>
</template>

<style module>
.title {
  color: red;
}
</style>

Vue CLI supports CSS Modules out of the box.

".title" class will be scoped to the component.

Example:

<template>
  <div class="app">
    <h1>Hello World</h1>
  </div>
</template>

<script>
import styled from 'vue-styled-components';

const Title = styled.h1`
  color: red;
`;

export default {
  components: {
    Title
  }
};
</script>

CSS-in-JS Libraries:

We can also use CSS-in-JS libraries like "styled-components" or "emotion" to scope styles directly within our Vue.js components. These libraries often provide features like automatic scoping, dynamic styles, and easy integration with component logic.

Note: the "Title" component has scoped styles defined using "vue-styled-components".

Note:

In Vue.js, whether we choose any one of the techniques such as scoped Styled, CSS Modules, or CSS-in-JS libraries, our goal is to ensure that styles are encapsulated within components, preventing conflicts and promoting component-based styling practices.

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