How to handle progressive image loading in Vue

How to handle progressive image loading in Vue

In modern web development, the image loading speed of the page directly affects the user experience and page performance. In order to improve the user's loading experience, progressive image loading came into being. Progressive image loading is a way to optimize image loading. It can first load a thumbnail or blurred image, and then gradually load the high-definition image, allowing users to quickly see the preview effect of the image without affecting other content on the page. exhibit.

Vue is a progressive framework for building user interfaces. It provides some powerful functions to handle progressive image loading. The following will introduce how to implement progressive image loading in Vue and provide specific code examples.

1. Use Vue’s v-lazy instruction

Vue provides a v-lazy instruction that can easily implement lazy loading of images. We can pass the paths of all the images that need to be loaded to the Vue component as an array and bind them to the img tag using the v-lazy directive. The image will not actually load until it enters the visible area of ​​the browser.

<template>
  <div>
    <img  src="/static/imghw/default1.png"  data-src="src"  class="lazy"  v-for="src in images" :data- v-lazy / alt="How to handle progressive image loading in Vue" >
  </div>
</template>

<script>
export default {
  data() {
    return {
      images: [
        'path/to/thumbnail.jpg',
        'path/to/high-res.jpg',
        // 更多图片路径...
      ]
    };
  }
};
</script>

Using the v-lazy instruction can very conveniently implement lazy loading of images, but if you need to achieve a progressive loading effect, you need to use some third-party libraries.

2. Use the vue-progressive-image plug-in

vue-progressive-image is a picture progressive loading plug-in specially used for Vue, which can realize the picture from blur to clear The gradual loading effect. The following is a sample code using the vue-progressive-image plug-in:

First, install the vue-progressive-image plug-in:

npm install vue-progressive-image --save

Then, introduce the vue-progressive-image plug-in into the Vue component, And configure the path of the image to be loaded into the images attribute in the Vue instance. Use the vue-progressive-image tag in the template and bind the images attribute to the src attribute.

<template>
  <div>
    <vue-progressive-image
      v-for="src in images"
      :src="src"
      placeholder="path/to/blur-image.jpg"
      :blur="20"
      :size="0.1"
    />
  </div>
</template>

<script>
import VueProgressiveImage from 'vue-progressive-image';

export default {
  components: {
    VueProgressiveImage
  },
  data() {
    return {
      images: [
        'path/to/thumbnail.jpg',
        'path/to/high-res.jpg',
        // 更多图片路径...
      ]
    };
  }
};
</script>

By configuring the placeholder attribute and blur attribute, the vue-progressive-image plug-in can achieve the blur effect of the image. As the image loading is gradually completed, the clarity of the image will gradually improve.

3. Use the vue-lazyload plug-in

Another commonly used Vue image lazy loading plug-in is vue-lazyload, which also supports progressive image loading. The following is a sample code for using the vue-lazyload plug-in:

First, install the vue-lazyload plug-in:

npm install vue-lazyload --save

Then, introduce the vue-lazyload plug-in into the Vue component and configure it according to your own needs Some options. Use the v-lazy directive in the template and bind the path of the image to be loaded to the src attribute of the img tag.

<template>
  <div>
    <img  v-for="src in images" v-lazy="src" / alt="How to handle progressive image loading in Vue" >
  </div>
</template>

<script>
import VueLazyload from 'vue-lazyload';

export default {
  directives: {
    lazy: VueLazyload
  },
  data() {
    return {
      images: [
        'path/to/thumbnail.jpg',
        'path/to/high-res.jpg',
        // 更多图片路径...
      ]
    };
  }
};
</script>

By using the vue-lazyload plug-in, the image will be loaded only when it enters the visible area of ​​the browser, thus improving the page loading speed and user experience.

Summary:

Progressive image loading is an effective method to improve user experience and page performance. As a powerful progressive framework, Vue provides some convenient methods and plug-ins. To implement progressive image loading. This article introduces the specific method of using Vue's v-lazy instruction, vue-progressive-image plug-in and vue-lazyload plug-in to implement progressive image loading, and provides corresponding code examples. Developers can choose a suitable method to implement progressive image loading based on actual needs, and configure and optimize it based on actual conditions to improve user experience and page performance.

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