How to implement image preview function in uniapp

How to implement the image preview function in uni-app

Introduction:
In mobile application development, image preview is a commonly used function. In uni-app, we can implement the image preview function by using uni-ui plug-ins or custom components. This article will introduce how to implement the image preview function in uni-app, with code examples.

1. Use the uni-ui plug-in to implement the image preview function
uni-ui is a component library based on Vue.js developed by DCloud, which provides a wealth of UI components and API interfaces, including Contains image preview component.
The following are the steps to use the uni-ui plug-in to implement the image preview function:

1. Install the uni-ui plug-in.
   Open the HBuilderX tool, select Plug-in in the menu bar -> Plug-in installation, search for uni-ui and install it.
2. Introducing uni-ui.
   Add the following code in the script tag in the page where you need to use the image preview function:

import uniGallery from '@/uni_modules/uni-ui/components/uni-gallery/uni-gallery.vue'
export default {
    components: {
        uniGallery
    }
}

3. Use the uni-gallery component.
   Add the following code in the template tag:

   <uni-gallery :list="images"></uni-gallery>

   Note: images is a list of pictures to be previewed, the format is an array, and each element contains the url and title attributes.

2. Custom components to implement the image preview function
If you don’t want to use the uni-ui plug-in, you can also implement the image preview function through custom components. The following are the steps for custom components to implement the image preview function:

1. Create an image preview component.
   Create a gallery folder in the components directory of the uni-app project, and create a gallery.vue file in the folder as the image preview component.

2. Implement image preview function.
   Add the following code to the gallery.vue file:

   <template>
       <view>
           <image v-for="(item, index) in list" :src="item.url" :key="index" @tap="previewImage(index)"></image>
       </view>
   </template>
   
   <script>
   export default {
       props: {
           list: {
               type: Array,
               required: true
           }
       },
       methods: {
           previewImage(index) {
               uni.previewImage({
                   urls: this.list.map(item => item.url), // 图片列表
                   current: index, // 当前显示图片的索引
                   indicator: 'default' // 图片指示器样式，默认为圆点
               })
           }
       }
   }
   </script>

   Note: list is a list of images to be previewed, in an array format, and each element contains the url attribute.

3. Use custom components.
   Introduce and register the gallery component in the script tag in the page where you need to use the image preview function, and then use the component in the template tag:

   <template>
       <gallery :list="images"></gallery>
   </template>
   
   <script>
   import gallery from '@/components/gallery/gallery.vue'
   export default {
       components: {
           gallery
       },
       data() {
           return {
               images: [
                   { url: 'http://example.com/image1.jpg' },
                   { url: 'http://example.com/image2.jpg' },
                   { url: 'http://example.com/image3.jpg' }
               ]
           }
       }
   }
   </script>

   Note: images is a list of images to be previewed.

   Summary:
   Whether using the uni-ui plug-in or custom components, we can implement the image preview function in uni-app. Through the preview function, we can provide users with a better image browsing experience. I hope this article will help you understand and implement the image preview function.

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