How to use Vue and Element-UI to implement lazy loading of images

How to use Vue and Element-UI to implement lazy loading of images

Lazy loading is a technology that delays loading of images, which can effectively improve page loading speed, save bandwidth and improve user experience . In the Vue project, we can use Element-UI and some plug-ins to implement the image lazy loading function. This article will introduce how to use Vue and Element-UI to implement lazy loading of images, and attach corresponding code examples.

1. Install the necessary dependencies

Before we start, we need to install some necessary dependencies:

1. Install Vue: You can use Vue’s official scaffolding tool Vue CLI to create a new Vue project. For specific installation methods, please refer to Vue official documentation.
2. Install Element-UI: Element-UI is a set of desktop component libraries based on Vue that can quickly build beautiful web interfaces. Element-UI can be installed via npm: npm install element-ui.
3. Install the vue-lazyload plug-in: This plug-in is Vue's image lazy loading library, which can implement the lazy loading function of images. vue-lazyload can be installed via npm: npm install vue-lazyload.

2. Configure lazy loading

In the project's entry file main.js, we need to make some configurations to enable the image lazy loading function. First, we introduce the vue-lazyload plug-in:

import VueLazyload from 'vue-lazyload'

Then, we use the Vue.use() method to install the vue-lazyload plug-in:

Vue.use(VueLazyload)

Next, we can configure vue in the Vue instance -Some options for the lazyload plugin. There are two main options that need to be configured: loading and error. The loading option indicates the placeholder image displayed when the image is loading; the error option indicates the error image displayed when the image fails to load. The following is an example configuration:

Vue.use(VueLazyload, {
  loading: require('路径/加载中图片.png'),
  error: require('路径/加载失败图片.png')
})

3. Use lazy loading

It is very simple to use lazy loading in Vue components. First, we need to add the v-lazy directive to the img tag in the template to specify the image link to be loaded lazily. The following is an example:

<template>
  <div>
    <img v-lazy="imageSrc" alt="图片">
  </div>
</template>

Then, define the imageSrc variable in Vue's data, and assign the image link to be lazy loaded to the imageSrc variable. Here is an example:

export default {
  data() {
    return {
      imageSrc: '要懒加载的图片链接'
    }
  }
}

Now, when we run the project and access the component containing the above code, the image will not load until it is scrolled to the visible area. At the same time, during the image loading process, the placeholder image will be displayed first. If the loading fails, the error image will be displayed.

4. Use lazy loading of Element-UI list components

In addition to using lazy loading in ordinary img tags, we can also use lazy loading in Element-UI list components. For example, in the ElTable component, we can use scoped slots to customize column content, and then use lazy loading in the custom columns. The following is an example:

<template>
  <div>
    <el-table :data="tableData">
      <el-table-column label="图片">
        <template slot-scope="scope">
          <img v-lazy="scope.row.imageSrc" alt="图片">
        </template>
      </el-table-column>
    </el-table>
  </div>
</template>

In the above example, we obtain the data of the current row through slot-scope, and assign the image link of the current row to the v-lazy instruction of the img tag.

5. Summary

By introducing the vue-lazyload plug-in, we can easily implement the image lazy loading function in the Vue project. Whether you use lazy loading in ordinary img tags or use lazy loading in Element-UI list components, you can use the vue-lazyload plug-in to achieve it. I hope this article can help you understand and use Vue and Element-UI to implement lazy loading of images.

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