封装element-upload上传+预览+ocr识别

需求：上传身份证反面识别后返回父组件，图片以base64格式传值后端

html：

 <div class="component-upload-image">
    <el-upload
      :ref="UploadImg.ref"
      :key="UploadImg.key"
      multiple
      action="#"
      list-type="picture-card"
      :http-request="(file)=>{return handleUploadSuccess(file,UploadImg.key)}"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      name="file"
      :on-remove="(file, fileList)=>{return handleRemove(file, fileList,UploadImg.key)}"
      :show-file-list="true"
      :file-list="fileList"
      :on-preview="(file)=>{return handlePictureCardPreview(file,UploadImg.key)}"
      :class="{ocrUpload:true, hide: this.fileList.length >= this.limit } "
      :style="{width:UploadImg.width,height:UploadImg.height,maxWidth:UploadImg.maxWidth,maxHeight:UploadImg.maxHeight}"
    >
      <img v-if="fileList.length==0" slot="default" class="oldImg" :src="UploadImg.imgDefault">
    </el-upload>

    <!-- 上传提示 -->
    <div v-if="showTip" slot="tip" class="el-upload__tip">
      请上传
      <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b> </template>
      <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b> </template>
      的文件
    </div>

    <el-dialog
      :visible.sync="dialogVisible"
      :title="dialogImageTitle"
      width="800"
      append-to-body
    >
      <img
        :src="dialogImageUrl"
        style="display: block; max-width: 100%; margin: 0 auto"
      >
    </el-dialog>
  </div>

引入图片压缩工具和ocr识别接口

import { compress } from '@/utils/compressImg'
import { ocrIdentify } from '@/api/ocr'

 

let _this
export default {
  props: {
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 1
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ['png', 'jpg', 'jpeg', 'bmp']
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: false
    },
    UploadImg: {
      type: Object,
      default: () => {}
    },
    UploadImgList: {
      type: Array,
      default: () => []
    }
  },
  data() {
    return {
      dialogImageUrl: '',
      dialogImageTitle: '预览',
      dialogVisible: false,
      hideUpload: false,
      fileList: [],
      ocrFile: {},
      previewUrl: '',
      UploadObj: {}
    }
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize)
    }
  },
  watch: {
    UploadImg: {
      handler(val) {
        if (val.imgBase) {
          const list = [{ name: val.ref, url: val.imgBase }]
          this.fileList = [...list]
        } else {
          this.fileList = []
          return []
        }
      },
      deep: true,
      immediate: true
    }
  },
  beforeCreate: function() {
    _this = this
  },
  methods: {
    // 删除图片
    handleRemove(file, fileList, index) {
      const findex = this.fileList.map(f => f.name).indexOf(file.name)
      if (findex > -1) {
        this.fileList.splice(findex, 1)
        this.$emit('imgbase64data', { ... _this.UploadImgList[index], ...{ Base64Url: null, data: {}, uploadType: 'M' }})
      }
    },
    // 上传成功回调
    handleUploadSuccess(param, index) {
      this.$modal.loading('正在上传图片，请稍候...')
      const reader = new FileReader()
      reader.onload = function() {
        const result = this.result // 图片base64字符串--压缩
        compress(result, 1000, 0.8).then(function(val) {
          _this.UploadObj = { ...param, ... _this.UploadImgList[index], ...{ Base64Url: val }}
          // OCR识别
          if (_this.UploadImgList[index].type === 'OCR') {
            const params = { data: {
              image: val
            }, ocrType: 3 }
            ocrIdentify(params).then(response => {
              _this.$emit('imgbase64data', { ... _this.UploadObj, ...{ data: response, uploadType: 'A' }})
            }).catch((err) => {
              _this.$emit('imgbase64data', { ... _this.UploadObj, ...{ Base64Url: null, data: {}, uploadType: 'M' }})
            })
          } else {
            _this.$emit('imgbase64data', { ... _this.UploadObj, ...{ data: {}, uploadType: 'A' }})
          }
          // 回显
          //   _this.fileList = [...[{ name: _this.UploadObj.file.name, url: _this.UploadObj.Base64Url }]]
          setTimeout(()=>{
              _this.$modal.closeLoading()
          },1000)
      
        })
      }
      reader.readAsDataURL(param.file) // Base64
    },
    // 上传前loading加载
    handleBeforeUpload(file) {
      let isImg = false
      if (this.fileType.length) {
        let fileExtension = ''
        if (file.name.lastIndexOf('.') > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1)
        }
        isImg = this.fileType.some(type => {
          if (file.type.indexOf(type) > -1) return true
          if (fileExtension && fileExtension.indexOf(type) > -1) return true
          return false
        })
      } else {
        isImg = file.type.indexOf('image') > -1
      }

      if (!isImg) {
        this.$modal.msgError(`文件格式不正确, 请上传${this.fileType.join('/')}图片格式文件!`)
        return false
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize
        if (!isLt) {
          this.$modal.msgError(`上传图片大小不能超过 ${this.fileSize} MB!`)
          return false
        }
      }
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`)
    },
    // 上传失败
    handleUploadError() {
      this.$modal.msgError('上传图片失败，请重试')
      this.$modal.closeLoading()
    },
    // 预览
    handlePictureCardPreview(file, index) {
      this.dialogImageUrl = file.url
      this.dialogImageTitle = this.UploadImgList[index].title || '预览'
      this.dialogVisible = true
    }
  }
}

 

部分样式：

<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
    display: none;
}
// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
    transition: all 0s;
}

::v-deep .el-list-enter, .el-list-leave-active {
    opacity: 0;
    transform: translateY(0);
}
</style>
<style lang="scss">
.ocrUpload{
   .el-upload,.is-success{
    max-width: 320px;
    max-height: 208px;
    width:100%   !important;
    height: 100% !important;
    line-height: 0  !important;
    border: none;
    img{
        width:100%;
         border-radius: 6px  !important;
    }
    }
    .el-upload-list--picture-card .el-upload-list__item{
        border: none !important;;
    }
}
</style>

 

效果图：