How to implement a series of functions such as picture uploading in WeChat mini program

This article mainly introduces the method of WeChat applet to implement the image upload, delete and preview functions, involving the WeChat applet interface layout, event response and image operation related implementation techniques. Friends in need can refer to the following

The example in this article describes how the WeChat applet implements image upload, deletion and preview functions. Share it with everyone for your reference, the details are as follows:

Here we mainly introduce the image upload, image deletion and image preview of the WeChat applet

Layout

<view class="img-v">
 <view class="img" wx:for="{{imgs}}" wx:for-item="item" wx:key="*this">
  <image src="{{item}}" data-index="{{index}}" mode="aspectFill" bindtap="previewImg"></image>
  <view class="delete-btn" data-index="{{index}}" catchtap="deleteImg"></view>
 </view>
 <view class="upload-img-btn" bindtap="chooseImg"></view>
</view>

JS processing

 data: {
  imgs: []
 },
// 上传图片
 chooseImg: function (e) {
  var that = this;
  var imgs = this.data.imgs;
  if (imgs.length >= 9) {
   this.setData({
    lenMore: 1
   });
   setTimeout(function () {
    that.setData({
     lenMore: 0
    });
   }, 2500);
   return false;
  }
  wx.chooseImage({
   // count: 1, // 默认9
   sizeType: ['original', 'compressed'], // 可以指定是原图还是压缩图，默认二者都有
   sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
   success: function (res) {
    // 返回选定照片的本地文件路径列表，tempFilePath可以作为img标签的src属性显示图片
    var tempFilePaths = res.tempFilePaths;
    var imgs = that.data.imgs;
    // console.log(tempFilePaths + '----');
    for (var i = 0; i < tempFilePaths.length; i++) {
     if (imgs.length >= 9) {
      that.setData({
       imgs: imgs
      });
      return false;
     } else {
      imgs.push(tempFilePaths[i]);
     }
    }
    // console.log(imgs);
    that.setData({
     imgs: imgs
    });
   }
  });
 },
 // 删除图片
 deleteImg: function (e) {
  var imgs = this.data.imgs;
  var index = e.currentTarget.dataset.index;
  imgs.splice(index, 1);
  this.setData({
   imgs: imgs
  });
 },
 // 预览图片
 previewImg: function (e) {
   //获取当前图片的下标
  var index = e.currentTarget.dataset.index;
   //所有图片
  var imgs = this.data.imgs;
  wx.previewImage({
   //当前显示图片
   current: imgs[index],
   //所有图片
   urls: imgs
  })
 }

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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