Handling Scoped Styles for External Elements in Vue 

# Handling Scoped Styles for External Elements in Vue

When developing with Vue.js, you may encounter the need to style externally imported components (such as Element UI). Since these components are dynamically generated at runtime and do not carry a `data-v` attribute, styles defined within `<style scoped>` do not apply to them. This article will introduce three methods to solve this issue.

## Method 1: Using `/deep/` or `>>>` Operator

This is the most common solution, which involves using deep selectors (like `/deep/` or `>>>`) to let scoped styles affect child components. However, it's worth noting that `/deep/` has been deprecated; it's recommended to use `::v-deep` as an alternative.

```vue
<template>
  <el-button class="custom-button">Button</el-button>
</template>

<style scoped>
.custom-button {
  /* Regular styles */
}

/* Affecting child components using ::v-deep */
::v-deep .el-button {
  background-color: red;
}
</style>

Method 2: Adding a Non-scoped <style> Outside of <style scoped>

This method is straightforward and involves adding a <style> block without the scoped attribute within the same .vue file. This approach is suitable for styles that indeed need to be applied globally.

<template>
  <el-button class="global-button">Button</el-button>
</template>

<!-- Non-scoped styles -->
<style>
.global-button {
  background-color: blue;
}
</style>

<!-- Scoped styles -->
<style scoped>
/* Other scoped styles */
</style>

Method 3: Using the :is Selector

The :is() pseudo-class function in CSS matches any one of a group of given selectors. In Vue, it can be used to style specific component tags without relying on the internal implementation details of those components. This is a native and clean approach.

<template>
  <div>
    <component :is="dynamicComponent"></component>
  </div>
</template>

<script>
export default {
  data() {
    return {
      dynamicComponent: 'el-button'
    }
  }
}
</script>

<style scoped>
/* Targeting specific components using :is selector */
div :is(el-button) {
  color: green;
}
</style>

Summary

The above are the three main methods for handling issues where scoped styles do not take effect on external components in Vue. Depending on actual needs and project specifications, you can choose the most suitable one or combine multiple methods. It’s important to note that with the development of Vue and related toolchains, best practices may change, so please keep an eye on official documentation and community discussions for the latest information.


This Markdown source code can be directly copied and used in your Markdown editor. Please make sure to adjust the code snippets and text content according to your actual situation.

Comments

Post a Comment

Popular posts from this blog

How to turn off Sass warning prompts in Nuxt.js projects

Background of the Issue When developing projects with Nuxt.js, it’s common to encounter a large number of Sass-related warning messages in the console. These warnings mainly include: Warnings about the order of mixin declarations. Warnings about the use of Legacy JS API. Although these warnings do not affect the operation of the program, they can degrade the development experience by cluttering the console. Today, we will explore how to elegantly address this issue. Solutions 1. Disable Warnings via Configuration In the nuxt.config.js file, we can modify the Sass configuration to suppress these warning messages: export default { build: { loaders: { scss: { sassOptions: { quietDeps: true , // Suppress warnings from dependencies logger: { warn: function ( message ) { return null ; // Silence warning messages }, debug: function ( message ) { return null ; // Silence ...
Read more

Guide to Modifying Docker Container Port Mappings

Guide to Modifying Docker Container Port Mappings If you need to modify the port mappings for an existing Docker container, such as one with the ID 123456 , follow these steps carefully. This guide assumes that you have administrative access to the Docker host and are familiar with using a text editor like vim on Linux systems. service docker stop Step 1: Modify hostconfig.json First, edit the hostconfig.json file located in the container’s directory: sudo vim /var/lib/docker/containers/ 123456 /hostconfig.json Look for the "PortBindings" configuration. If your container was started with port mappings, this object will not be empty. Add or update the port bindings as follows: { " PortBindings ": { " 5700/tcp ": [{ " HostIp ": "" , " HostPort ": "10086" }] , " 6700/tcp ": [{ " HostIp ": "" , " HostP...
Read more

Optimizing Class Name Management with CSS Attribute Selector

Optimizing Class Name Management with CSS Attribute Selectors In modern web development, managing class names in HTML and CSS is a common challenge. As projects grow in size, the stacking and repeated use of class names often lead to bloated and hard-to-maintain CSS code. This article introduces how to leverage CSS’s special attribute selectors to manage class names in a more elegant and efficient way. The Problem In HTML, we frequently use class names to define element styles. For example: < div class = "bestseller out-of-stock" > ... </ div > As the project evolves, the number of class names can grow significantly, making the CSS code difficult to maintain. For example: .bestseller { ... } .out-of-stock { ... } In such cases, the CSS file becomes lengthy and hard to manage. The Power of CSS Attribute Selectors CSS provides three special attribute selectors that are similar in concept to regular expressions, helping us filter class names more flexibly ...
Read more