WeChat applet implements image upload function

WeChat applet implements picture upload function

With the development of mobile Internet, WeChat applet has become an indispensable part of people's lives. WeChat mini programs not only provide a wealth of application scenarios, but also support developer-defined functions, including image upload functions. This article will introduce how to implement the image upload function in the WeChat applet and provide specific code examples.

1. Preliminary preparations
Before starting to write code, we need to download and install the WeChat developer tools and register as a WeChat developer. At the same time, you also need to understand the relevant content of WeChat applet development and API documentation.

2. Writing code
The image upload function in the WeChat applet is mainly implemented through the two APIs wx.chooseImage and wx.uploadFile . Below is a specific code example.

1. Add the code for buttons and image display areas in the .wxml file:

<button bindtap="chooseImage">选择图片</button>
<image src="{{imagePath}}" mode="aspectFill"></image>

2. Write the functions for selecting images and uploading images in the .js file:

Page({
  data: {
    imagePath: ''
  },

  // 选择图片
  chooseImage: function () {
    wx.chooseImage({
      count: 1, // 可选择图片的数量
      sizeType: ['original', 'compressed'], // 可选择图片的类型：原图或压缩图
      sourceType: ['album', 'camera'], // 可选择图片的来源：相册或相机
      success: (res) => {
        const tempFilePaths = res.tempFilePaths
        this.setData({
          imagePath: tempFilePaths[0]
        })
        // 调用上传图片函数
        this.uploadImage(tempFilePaths[0])
      }
    })
  },

  // 上传图片
  uploadImage: function (imagePath) {
    wx.uploadFile({
      url: 'https://your-upload-url', // 图片上传接口的URL
      filePath: imagePath,
      name: 'image', // 上传图片时的名称
      formData: {
        'user': 'test' // 其他的参数
      },
      success: (res) => {
        // 图片上传成功后的处理逻辑
        console.log(res)
      },
      fail: (error) => {
        // 图片上传失败后的处理逻辑
        console.log(error)
      }
    })
  }
})

3. Code analysis

1. When selecting pictures, we use wx.chooseImageAPI, through which users can select from the photo album Or select a picture in the camera and save the selected picture path in tempFilePaths.
2. After selecting the image, we save the selected image path in imagePath and upload the image by calling the this.uploadImage function.
3. When uploading images, we use the wx.uploadFileAPI, through which the selected images can be uploaded to the specified interface URL.

4. Summary
This article introduces how to implement the image upload function through the WeChat applet and provides specific code examples. By using the two APIs wx.chooseImage and wx.uploadFile, we can easily implement image selection and upload operations. Developers can further improve this function according to their own needs, such as adding progress bars, error handling, etc. I believe that by using the code examples in this article as a basis, developers can easily implement the image upload function in WeChat mini programs.

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