Use uniapp to implement image preview function

Use uniapp to implement image preview function

In modern social media and mobile applications, the image preview function is almost standard. In uniapp, we can easily implement the preview function of pictures and provide users with a good experience. This article will introduce how to use uniapp to implement the image preview function and provide specific code examples.

1. Import the required plug-ins
   In order to implement the image preview function, we need to use the uni.previewImage plug-in provided by uniapp. In the uniapp project, we can install the plug-in through the following command:

   npm install @dcloudio/uni-ui

   After the installation is completed, enter the main.js file of the project, import the plug-in and register it as a global component:

   import uniPreviewImage from '@dcloudio/uni-ui/lib/uni-preview-image/uni-preview-image.vue'
   Vue.component('uni-preview-image', uniPreviewImage)

2. Add preview button
   In pages that need to implement the image preview function, we can trigger the preview operation of the image by adding a preview button. The specific code is as follows:

   <template>
     <view>
    <image src="/static/img1.jpg" @click="previewImage(['/static/img1.jpg'])" mode="aspectFill"></image>
    <image src="/static/img2.jpg" @click="previewImage(['/static/img1.jpg', '/static/img2.jpg'])" mode="aspectFill"></image>
    <image src="/static/img3.jpg" @click="previewImage(['/static/img1.jpg', '/static/img2.jpg', '/static/img3.jpg'])" mode="aspectFill"></image>
    <uni-preview-image :image-list="imageList" :show="showPreview"></uni-preview-image>
     </view>
   </template>
   
   <script>
   export default {
     data() {
    return {
      imageList: [], // 预览图片数组
      showPreview: false, // 控制预览组件显示与隐藏
    }
     },
     methods: {
    previewImage(images) {
      this.imageList = images
      this.showPreview = true
    },
     },
   }
   </script>

   In the above code, we pass the image array to be previewed to the uni-preview-image component through the v-bind instruction, and pass the flag of whether to display the preview component through the v-bind instruction. Give the show attribute. By clicking on different pictures, we can preview different pictures.

3. Preview image
   Through the above code, we have implemented the function of triggering image preview, but in fact there are still some key codes missing to achieve the function of previewing images. The specific code is as follows:

   <template>
     <view>
    ...
    <uni-preview-image :image-list="imageList" :show="showPreview" @change="previewChange" @close="previewClose"></uni-preview-image>
     </view>
   </template>
   
   <script>
   export default {
     data() {
    return {
      ...
    }
     },
     methods: {
    ...
    previewChange(event) {
      console.log('当前预览图片索引：', event.detail.current)
    },
    previewClose() {
      this.showPreview = false
    },
     },
   }
   </script>

   In the above code, we bound the previewChange and previewClose methods through the @change and @close instructions respectively. When the user switches preview images, the previewChange method will be triggered and the index of the current preview image will be obtained through the event.detail.current property. When the preview is closed, the previewClose method is triggered and the show attribute is set to false to hide the preview component.

At this point, we have completed the steps of using uniapp to implement the image preview function. With a few simple lines of code, we can implement a powerful and easy-to-use image preview function. Hope this article is helpful to you!

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