[Mini Programe] Upload Images

Code for upload iamges:

chooseImage: choose the images to upload

previewImage: preview the image and enable slide

  chooseImage() {
    wx.chooseImage({
      count: 3,
      sizeType: ['compressed'],
      sourceType: ['album', 'camera'],
      success: res => {
        let currentImages = res.tempFilePaths

        this.setData({
          images: currentImages
        })
      },
    })

  },

  previewImg(event) {
    let target = event.currentTarget
    let src = target.dataset.src

    wx.previewImage({
      current: src,
      urls: this.data.images
    })
  },

Upload to the server:

  uploadImage(cb) {
    let commentImages = this.data.commentImages
    let images = []

    if (commentImages.length) {
      let length = commentImages.length
      for (let i = 0; i < length; i++) {
        wx.uploadFile({
          url: config.service.uploadUrl,
          filePath: commentImages[i],
          name: 'file',
          success: res => {
            let data = JSON.parse(res.data)
            length--

            if (!data.code) {
              images.push(data.data.imgUrl)
            }

            if (length <= 0) {
              cb && cb(images)
            }
          },
          fail: () => {
            length--
          }
        })
      }
    } else {
      cb && cb(images)
    }
  },

  onInput(event) {
    this.setData({
      commentValue: event.detail.value.trim()
    })
  },

  chooseImage() {
    let currentImages = this.data.commentImages

    wx.chooseImage({
      count: 3,
      sizeType: ['compressed'],
      sourceType: ['album', 'camera'],
      success: res => {

        currentImages = currentImages.concat(res.tempFilePaths)

        let end = currentImages.length
        let begin = Math.max(end - 3, 0) // latest three pictures
        currentImages = currentImages.slice(begin, end)

        this.setData({
          commentImages: currentImages
        })

      },
    })
  },