How to implement multi-image upload function in uniapp

Uniapp is a cross-platform framework developed based on Vue.js, through which we can easily develop applications that are suitable for multiple platforms at the same time. In actual development, we often encounter the need to implement multiple image uploads. This article will introduce how to implement the multi-image upload function in uniapp.

1. Use uniapp's uploadFile API to implement multiple image uploads
Uniapp provides an API called uploadFile, which can be used to upload files. We can use this API to implement the multi-image upload function. The following is a sample code:

<template>
  <view>
    <button @click="chooseImage">选择图片</button>
    <button @click="uploadImages">上传图片</button>
    <view v-for="(image, index) in images" :key="index">
      <image :src="image"></image>
    </view>
  </view>
</template>

<script>
export default {
  data() {
    return {
      images: [] // 存放选择的图片
    };
  },
  methods: {
    chooseImage() {
      uni.chooseImage({
        count: 9, // 最多选择9张图片
        success: (res) => {
          this.images = res.tempFilePaths;
        }
      });
    },
    uploadImages() {
      // 遍历images数组，逐个上传图片
      this.images.forEach((image) => {
        uni.uploadFile({
          url: 'http://example.com/upload', // 上传接口地址
          filePath: image,
          name: 'file',
          success: (res) => {
            console.log('上传成功', res.data);
          },
          fail: (err) => {
            console.log('上传失败', err);
          }
        });
      });
    }
  }
};
</script>

1. First, we need to add a button on the page to trigger the action of selecting an image.
2. After the user clicks the select image button, the chooseImage method will be called, and the system's image selector will pop up through the uni.chooseImage API, and a maximum of 9 images will be selected. After the selection is completed, the selected picture will be saved in the images array.
3. After the user clicks the upload image button, the uploadImages method will be called. This method will traverse the images array and call the uni.uploadFile API one by one to upload images. After the upload is successful or failed, we can handle it accordingly according to actual needs.

2. Use the third-party plug-in uni-file-uploader to achieve multi-image upload
In addition to using the API provided natively by uniapp, we can also use some third-party plug-ins to implement the multi-image upload function . One of the more commonly used plug-ins is uni-file-uploader. The following is the sample code:

<template>
  <view>
    <uni-file-uploader :file-list="images" @upload-success="handleSuccess" @remove="handleRemove"></uni-file-uploader>
  </view>
</template>

<script>
import uniFileUploader from '@/components/uni-file-uploader/uni-file-uploader.vue';

export default {
  components: {
    uniFileUploader
  },
  data() {
    return {
      images: [] // 存放选择的图片
    };
  },
  methods: {
    handleSuccess(file) {
      console.log('上传成功', file);
    },
    handleRemove(file) {
      console.log('移除文件', file);
    }
  }
};
</script>

1. First, we need to introduce the uni-file-uploader component into the page and register it in components.
2. Use the uni-file-uploader component in the template and bind the images array through :file-list to display the selected picture list. At the same time, we listened to the upload-success event and remove event, and called the handleSuccess and handleRemove methods respectively to handle the upload success and file removal operations.
3. In the handleSuccess method, we can obtain the successfully uploaded file information and process it accordingly. In the handleRemove method, we can obtain the removed file information and perform corresponding operations.

Summary:
This article introduces how to implement the multi-image upload function in uniapp. We can upload multiple images through the uploadFile API provided natively by uniapp, or we can use the third-party plug-in uni-file-uploader. Choose the appropriate method to implement the multi-image upload function according to actual needs. Hope this article is helpful to you!

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