vue+ElementUI实现带进度条的文件上传

（注： 该方法只适用于附件的自动上传）

1.html部分代码

<div class="uploadContent" >
        <div class="uploadAndList">
          <el-upload
            class="upload-demo"
            drag
            :action="uploadUrl"
            multiple
            :headers="header"
            :file-list="fileList"
            :show-file-list="false"
            :on-change="handleChange"
            :on-remove="handleRemove"
            :auto-upload="true"
            :on-progress="handleProgress"
            :on-success="handleSuccess"
            :on-error="handleError"
          >
            <i class="el-icon-upload"></i>
            <div class="el-upload__text">
              将文件拖到此处，或<em>点击上传</em>
            </div>
          </el-upload>
        </div>
        <el-divider direction="vertical"></el-divider>
        <div class="uploadFileList">
          <div class="successFiles">正在上传 ({{successNum}} / {{totalNum}})</div>
          <el-divider></el-divider>
          <div class="upload_list_ul">
            <div class="upload_list_ul_li" v-for="(item, index) in fileList" :key="index">
              <div class="content_wrap" @mouseover="mouseoverHandle(index)" @mouseout="mouseoutHandle">
                <i class="el-icon-document"></i>
                <div class="fileName">
                  <div class="fileNameTop">
                    <span class="file_name"> {{item.name}} </span>
                    <i class="el-icon-circle-check" v-if="ins!==index&&item.progress===100"></i>
                  </div>
                  <el-progress v-if="item.progress!=100"  :percentage="item.progress"></el-progress>
                </div>
                <!-- <i class="el-icon-circle-close" @click="deleteItem(index)" v-show="ins==index">
                </i> -->
              </div>
              <el-divider></el-divider>
            </div>
          </div>
        </div>
      </div>

2.js部分代码

import { getToken } from "@/utils/auth";
export default {
  data() {
    return {
      successNum: 0,
      totalNum: 0,
      fileList: [],
      uploadUrl: "", //文件上传接口地址
      header: {
        Authorization: "Bearer " + getToken(),
      },
    }
  },

  methods: {
    handleChange(file, fileList) {
      this.fileList = fileList;
      this.totalNum = this.fileList.length;
    },
    handleRemove(file, fileList) {
      this.fileList = fileList;
    },
    
    handleProgress(event, file, fileList) {
      if (this.fileList.length > 0) {
        this.fileList.forEach((element, index) => {
          if (element.uid === file.uid) {
            // 更新这个uid下的进度
            const progress = Math.floor(event.percent);
            // 防止上传完接口还没有返回成功值，所以此处给定progress的最大值为99，成功的钩子中再置为100
            element.progress = progress === 100 ? 99 : progress;
            this.$set(this.fileList, index, element);
          }
        })
      }
    },
    handleSuccess(response, file, fileList) {
      this.fileList.forEach((element, index) => {
        if (element.uid === file.uid) {
          element.progress = 100;
          this.successNum++;
          // this.$message.success('文件上传成功');
          this.$set(this.fileList, index, element);
          this.getFileDetailById();
        }
      });
    },
    handleError(err, file, fileList) {
      this.fileList.forEach((element, index) => {
        if (element.uid === file.uid) {
          this.fileList.splice(index, 1); // 上传失败删除该记录
          this.$message.error('文件上传失败');
        }
      });
    },
    
    mouseoutHandle() {
      this.ins = -1;
    },

    mouseoverHandle(index) {
      this.ins = index;
    },
  }
}

3.scss部分代码

<style lang="scss" scoped>
  .uploadContent {
    width: 100%;
    height: 100%;
    display: flex;
    .uploadAndList {
      width: 40%;
    }
    .uploadFileList {
      .successFiles {
        width: 100%;
        height: 35px;
        line-height: 35px;
        padding-left: 20px;
        font-size: 18px;
        font-weight: bold;
      }
      width: 60%;
      height: 100%;
      overflow-y: auto;
      >.upload_list_ul{
        >.upload_list_ul_li{
          >.content_wrap{
            width: 100%;
            height: 50px;
            font-size: 14px;
            line-height: 20px;
            padding:  0 0 0 10px;
            display: flex;
            align-items: center;
            .el-icon-document {
              font-size: 20px;
            }
            >i.el-icon-document,span{
              color: #333;
              vertical-align: middle;
            }
            >i.el-icon-circle-close{
              font-size: 16px;
              color: #F56C6C;
              // float: right;
              // vertical-align: middle;
              z-index: 999;
            }
            >span{
              cursor: pointer;
              display: inline-block;
              margin-left: 4px;
              max-width: 160px;
              overflow: hidden;
              text-overflow: ellipsis;
              white-space: nowrap;
            }
            >.file_name:hover{
              color: #409EFF;
              text-decoration: underline;
            }
            .fileName {
              width: calc(100% - 22px);
              height: 100%;
              padding-left: 10px;
              display: flex;
              flex-direction: column;
              justify-content: center;
              .fileNameTop {
                display: flex;
                justify-content: space-between;
                align-content: center;
                .file_name {
                  font-size: 16px;
                }
                .el-icon-circle-check{
                  font-size: 16px;
                  color: #67C23A !important;
                }
              }
            }
          }
          >.content_wrap:hover{
            background: rgba(0,0,0,.035);
          }
        }
      }
    }
    .el-divider--vertical {
      height: auto;
      margin: 0px;
    }
    .el-divider--horizontal {
      margin: 0px;
    }
  }
</style>