Tips for using scoped CSS to achieve component style isolation in Vue

Tips of using scoped CSS to implement component style isolation in Vue

Vue is a popular JavaScript framework, and its componentized structure accelerates the efficiency of front-end development. At the same time, as the size of the application increases, the maintenance of styles becomes more difficult. In this case, Vue provides a simple but powerful technology called scoped CSS that can help us achieve component style isolation. In this article, we will explore how to use scoped CSS technology to achieve style isolation of components.

Scoped CSS Introduction

In Vue, we can use Level 3 CSS Selector to develop styles for components. As shown below:

<template>
  <div class="my-component">
    <p>Component content</p>
  </div>
</template>

<style>
.my-component p {
  color: red;
}
</style>

This code creates a component named my-component and uses a Level 3 CSS Selector in the component. Styles are only applied to e388a4556c0f65e1904146cc1a846bee elements within a .my-component element. This technique is called style scoping. As the number of components increases, this can lead to style conflicts, where two components have the same CSS type, leading to potential display issues. To solve this problem, Vue provides a keyword called scoped that can limit styles to the scope of the component. As shown below:

<template>
  <div class="my-component">
    <p>Component content</p>
  </div>
</template>

<style scoped>
p {
  color: red;
}
</style>

In this example, the style is only applied to the e388a4556c0f65e1904146cc1a846bee element in the component template.

Note

• scoped CSS is not a new technology, but an application on Vue.
• Scoped CSS uses pseudo tags, such as scoped, which can only be applied to style tags.
• scoped CSS is implemented by adding a pseudo-class tag to each applied element. You can limit the scope of the style by adding this tag, regardless of whether the same element is used in multiple components.

scoped CSS sample code

To demonstrate scoped CSS technology, we will create a sample containing two components. Each component will contain different styles.

First, we will create the first component that will style a form with a button. In this component, the button will be marked red, with a black background color and a bold border.

<template>
  <div>
    <h3>Component 1</h3>
    <form class="my-form">
      <button class="my-button">Submit</button>
    </form>
  </div>
</template>

<style scoped>
.my-form button {
  background-color: black;
}

.my-form .my-button {
  color: red;
  background-color: white;
  border: 2px solid black;
  font-weight: bold;
}
</style>

Next, we create a second component, which will contain an input box and a progress bar with a slider. In this component, the progress bar will be marked green and the text input box will be set to gray.

<template>
  <div>
    <h3>Component 2</h3>
    <div class="progress">
      <input type="text" class="input-text">
      <div class="slider"></div>
    </div>
  </div>
</template>

<style scoped>
.input-text {
  color: gray;
}

.progress .slider {
  background-color: green;
  height: 10px;
  width: 50%;
}
</style>

In this sample code, we use scoped CSS technology to ensure that the style of each component does not affect other components. This will ensure that each component only contains its relevant styles and is not affected by other components.

Summary

In this article, we discussed scoped CSS technology in Vue. It allows us to scope styles within a component to avoid style conflicts between different components. Use the tips in this article to implement component style isolation in your next Vue project. This will make your code more modular and maintainable.

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