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element-ui文件上传el-upload

    element-ui官网中有文件上传

    首先先展示一下我页面的实现效果,如下图所示:

     从图中可以看出,我这边实现的是一个可显示进度条的文件上传操作,而且如果上传的文件很大等,还可以中断文件上传。

    值得注意的是,如果有添加进度条,那就会存在一个bug,在文件没上传完时在点击重新上传文件进度条及百分比就会不停闪,原因是上个上传请求在同时进行。

    当然这些代码也会在接下来的讲解中进行解决

    【解决方法】只需要在下图位置操作时中断请求即可

    1.在弹框点击取消和右上角X的时候中断文件上传请求

    2.页面上添加取消上传按钮,文件选择按钮点击后,文件选择按钮置灰,直到文件上传成功后才启用。或者用户可以点击取消上传,此时中断当前上传请求,文件上传按钮启用,用户可以点击按钮继续上传文件

    接下来看看代码的大致结构:

    1.页面标签和变量声明

<el-row>
          <el-col :span="8">
            <el-form-item label="" prop="remark" label-width="105px">
              <el-upload
                ref="uploadFileList"
                action=""
                class="upload-demo"
                style="display:inline-block;max-width: 670px;"
                :limit="1"
                multiple
                list-type="text"
                accept=".exe"
                :before-upload="beforeUpload"
              >
                <el-button slot="trigger" size="small" type="primary" :disabled="fileBtnDisabled">选取文件</el-button>
              </el-upload>
            </el-form-item>
          </el-col>
          <el-col :span="13">
            <el-form-item label="" prop="fileName" label-width="0">
              <el-input v-model="temp.fileName" maxlength="100" style="margin-top: 1px;" disabled></el-input>
            </el-form-item>
          </el-col>
          <el-col :span="2">
            <el-button style="margin-top: 2px;" size="mini" title="取消上传" class="editBtn" @click="cancel1"><svg-icon icon-class="cancel" /></el-button>
          </el-col>
        </el-row>
        <el-row v-if="progress">
          <el-col :span="23">
            <el-form-item label="" prop="" label-width="105px">
              <el-progress
                :percentage="progressPercent"
              ></el-progress>
            </el-form-item>
          </el-col>
        </el-row>
progress: false, // 进度条是的显示
progressPercent: 0, // 进度条百分比
source: null, // 中断文件上传请求用
fileBtnDisabled: false, // 文件上传按钮是否禁用
     2.页面方法实现

/**
     * 文件上传
     * beforeupload阻止组件自动上传,自己调上传接口
     * @param file
     * @returns {boolean}
     */
    beforeUpload(file) {
      // console.log('file', file)
      // 验证
      if (file.size === 0) {
        this.$notify({
          title: '失败',
          message: '不存在上传文件',
          type: 'error',
          duration: 2000
        })
        return false
      }
      this.loading = true
      const from = new FormData();
      from.append('file', file);
      from.append('type', 1);
      this.progress = true // 显示进度条
      this.temp.fileName = '' // 文件名称置空
      this.progressPercent = 0 // 进度条百分比
      const uploadEvent = (progressEvent) => { // 进度条百分比
        this.progressPercent = Number(
          ((progressEvent.loaded / progressEvent.total) * 100).toFixed(2)
        );
      };
      this.source = this.connectionSource() // 中断请求时用
      const cacheToken = this.source.token  // 这个是上传会话token,取消上传操作需要的参数
      this.fileBtnDisabled = true // 禁用上传按钮
      /**
       * 上传文件接口
       */
      fileUploading(from, uploadEvent, cacheToken).then(res => {
        // 请求成功后,将文件名称,路径,大小复制到temp对应字段中,新增修改要用
        this.temp = Object.assign({}, this.temp, {
          fileName: res.data.fileName,
          url: res.data.url,
          size: res.data.size
        })
        this.$notify({
          title: '成功',
          message: '请求成功',
          type: 'success',
          duration: 2000
        })
        this.progress = false // 隐藏进度条
        this.loading = false
        this.fileBtnDisabled = false // 启用上传按钮
      }).catch(() => {
        this.progress = false // 隐藏进度条
        this.loading = false
        this.fileBtnDisabled = false // 启用上传按钮
      })
      return false
    },
    /**
     * 得到取消操作需要的连接
     * */
    connectionSource() {
      return axios.CancelToken.source()
    },
    /**
     * 弹框取消按钮或右上方X点击关闭弹框时,取消上传
     * 写两个取消上传的原因是,如果取消上传按钮直接调这个方法,dialog弹框会关闭
     * */
    cancel() {  // 取消上传
      this.dialogVisible = false
      if (this.source) {
        this.source.cancel()
        this.fileBtnDisabled = false
      }
    },
    /**
     * 取消上传按钮
     * */
    cancel1() {  // 取消上传
      if (this.source) {
        this.source.cancel()
        this.fileBtnDisabled = false
      }
    },
    3.dialog弹框关闭时,中断文件上传

<el-dialog
      v-el-drag-dialog
      :close-on-click-modal="false"
      :modal="false"
      :title="title"
      :visible.sync="dialogVisible"
      width="600px"
      @dragDialog="handleDrag"
      @close="cancel"
    >
</el-dialog>
<el-button @click="cancel">
    取消
</el-button>
    4.中断请求还需要用到axios

import axios from 'axios' // 中断文件上传请求时使用
    5.接口修改

/**
 * 文件上传
 * (添加文件上传进度条和中断请求,对接口进行修改)
 * @returns {AxiosPromise}
 * type: 类型
 */
export function fileUploading(data, onUploadProgress, token) {
  return request.post('/file/upload', data, { 'Content-Type': 'multipart/form-data', timeout: 0, onUploadProgress, cancelToken: token })
  // return request({
  //   url: '/file/upload',
  //   method: 'post',
  //   data
  // })
}

经过上面一系列操作后,文件上传的功能就实现了,如果还有不清楚的话,我把edit.vue的代码全部附上,但是真正文件上传能用到的部分只有我上面代码抠出来的部分。附上全部代码只是为了方便大家查看具体一点的代码结构而已。

edit.vue完整代码:

<template>
  <div>
    <el-dialog
      v-el-drag-dialog
      :close-on-click-modal="false"
      :modal="false"
      :title="title"
      :visible.sync="dialogVisible"
      width="600px"
      @dragDialog="handleDrag"
      @close="cancel"
    >
      <el-form ref="dataForm" :rules="rules" :model="temp" label-position="right" label-width="75px" style="width: 550px;">
        <el-row>
          <el-col :span="23">
            <el-form-item label="xx" prop="name" label-width="105px">
              <el-input v-model="temp.name" maxlength="100"></el-input>
            </el-form-item>
          </el-col>
        </el-row>
        <el-row>
          <el-col :span="23">
            <el-form-item label="xx" prop="fileType" label-width="105px">
              <el-select v-model="temp.fileType" filterable placeholder="请选择xx">
                <el-option
                  v-for="item in fileTypeOption"
                  :key="item.id"
                  :label="item.label"
                  :value="item.id"
                >
                </el-option>
              </el-select>
            </el-form-item>
          </el-col>
        </el-row>
        <el-row>
          <el-col :span="8">
            <el-form-item label="" prop="remark" label-width="105px">
              <el-upload
                ref="uploadFileList"
                action=""
                class="upload-demo"
                style="display:inline-block;max-width: 670px;"
                :limit="1"
                multiple
                list-type="text"
                accept=".exe"
                :before-upload="beforeUpload"
              >
                <el-button slot="trigger" size="small" type="primary" :disabled="fileBtnDisabled">选取文件</el-button>
              </el-upload>
            </el-form-item>
          </el-col>
          <el-col :span="13">
            <el-form-item label="" prop="fileName" label-width="0">
              <el-input v-model="temp.fileName" maxlength="100" style="margin-top: 1px;" disabled></el-input>
            </el-form-item>
          </el-col>
          <el-col :span="2">
            <el-button style="margin-top: 2px;" size="mini" title="取消上传" class="editBtn" @click="cancel1"><svg-icon icon-class="cancel" /></el-button>
          </el-col>
        </el-row>
        <el-row v-if="progress">
          <el-col :span="23">
            <el-form-item label="" prop="" label-width="105px">
              <el-progress
                :percentage="progressPercent"
              ></el-progress>
            </el-form-item>
          </el-col>
        </el-row>
        <el-row>
          <el-col :span="23">
            <el-form-item label="xx" prop="version" label-width="105px">
              <el-input v-model="temp.version" maxlength="100"></el-input>
            </el-form-item>
          </el-col>
        </el-row>
        <el-row>
          <el-col :span="23">
            <el-form-item label="" prop="" label-width="105px">
              <el-checkbox v-model="temp.isDeft">xx</el-checkbox>
            </el-form-item>
          </el-col>
        </el-row>
        <el-row>
          <el-col :span="23">
            <el-form-item label="xx" prop="remark" label-width="105px">
              <el-input v-model="temp.remark" maxlength="100"></el-input>
            </el-form-item>
          </el-col>
        </el-row>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button :loading="submitting" type="primary" @click="dialogStatus==='create'?createData():updateData()">
          确认
        </el-button>
        <el-button @click="cancel">
          取消
        </el-button>
      </div>
    </el-dialog>
  </div>
</template>

<script>
import elDragDialog from '@/directive/el-dragDialog'
import { fileAdd, fileInfo, fileUpdate } from '@/api/systemOperational/softwareDownload';
import { fileUploading } from '@/api/file';
import axios from 'axios' // 中断文件上传请求时使用

export default {
  name: 'Edit',
  directives: { elDragDialog },
  components: { },
  props: {
    title: {
      type: String,
      default() {
        return ''
      }
    },
    dialogStatus: {
      type: String,
      default() {
        return ''
      }
    }
  },
  data() {
    return {
      progress: false, // 进度条是的显示
      progressPercent: 0, // 进度条百分比
      source: null, // 中断文件上传请求用
      fileBtnDisabled: false, // 文件上传按钮是否禁用
      dialogVisible: false,
      submitting: false,
      temp: {},
      defaultTemp: { // 表单字段
        id: undefined,
        name: '',
        fileType: 1,
        version: '',
        fileName: '',
        size: undefined,
        isDeft: false,
        remark: ''
      },
      fileTypeOption: [ // xx
        {
          id: 1,
          label: 'xx'
        }
      ],
      rules: {
        name: [
          { required: true, message: 'xx不能为空', trigger: 'blur' }
        ],
        fileType: [
          { required: true, message: 'xx不能为空', trigger: 'blur' }
        ],
        fileName: [
          { required: true, message: '请选择文件', trigger: 'blur' }
        ],
        version: [
          { required: true, message: 'xx不能为空', trigger: 'blur' }
        ]
      }
    }
  },
  computed: {
  },
  created() {
    this.resetTemp()
  },
  methods: {
    /**
     * 文件上传
     * beforeupload阻止组件自动上传,自己调上传接口
     * @param file
     * @returns {boolean}
     */
    beforeUpload(file) {
      // console.log('file', file)
      // 验证
      if (file.size === 0) {
        this.$notify({
          title: '失败',
          message: '不存在上传文件',
          type: 'error',
          duration: 2000
        })
        return false
      }
      this.loading = true
      const from = new FormData();
      from.append('file', file);
      from.append('type', 1);
      this.progress = true // 显示进度条
      this.temp.fileName = '' // 文件名称置空
      this.progressPercent = 0 // 进度条百分比
      const uploadEvent = (progressEvent) => { // 进度条百分比
        this.progressPercent = Number(
          ((progressEvent.loaded / progressEvent.total) * 100).toFixed(2)
        );
      };
      this.source = this.connectionSource() // 中断请求时用
      const cacheToken = this.source.token  // 这个是上传会话token,取消上传操作需要的参数
      this.fileBtnDisabled = true // 禁用上传按钮
      /**
       * 上传文件接口
       */
      fileUploading(from, uploadEvent, cacheToken).then(res => {
        // 请求成功后,将文件名称,路径,大小复制到temp对应字段中,新增修改要用
        this.temp = Object.assign({}, this.temp, {
          fileName: res.data.fileName,
          url: res.data.url,
          size: res.data.size
        })
        this.$notify({
          title: '成功',
          message: '请求成功',
          type: 'success',
          duration: 2000
        })
        this.progress = false // 隐藏进度条
        this.loading = false
        this.fileBtnDisabled = false // 启用上传按钮
      }).catch(() => {
        this.progress = false // 隐藏进度条
        this.loading = false
        this.fileBtnDisabled = false // 启用上传按钮
      })
      return false
    },
    /**
     * 得到取消操作需要的连接
     * */
    connectionSource() {
      return axios.CancelToken.source()
    },
    /**
     * 弹框取消按钮或右上方X点击关闭弹框时,取消上传
     * 写两个取消上传的原因是,如果取消上传按钮直接调这个方法,dialog弹框会关闭
     * */
    cancel() {  // 取消上传
      this.dialogVisible = false
      if (this.source) {
        this.source.cancel()
        this.fileBtnDisabled = false
      }
    },
    /**
     * 取消上传按钮
     * */
    cancel1() {  // 取消上传
      if (this.source) {
        this.source.cancel()
        this.fileBtnDisabled = false
      }
    },
    /**
     * 打开新增弹框<父组件调用>
     */
    handleCreateEditShow() {
      this.resetTemp()
      this.dialogVisible = true
      this.$nextTick(() => {
        this.$refs['dataForm'].clearValidate()
      })
    },
    /**
     * 新增(确认)
     */
    createData() {
      this.submitting = true
      this.$refs['dataForm'].validate((valid) => {
        if (valid) {
          const tempData = Object.assign({}, this.temp)
          fileAdd(tempData).then(res => {
            // console.log('res', JSON.parse(JSON.stringify(res)))
            this.dialogVisible = false
            this.$parent.refreshTab() // 子组件调用父组件方法,刷新列表
            this.submitting = false
            this.$notify({ title: this.$t('text.success'), message: '新增成功!', type: 'success', duration: 2000 })
          }).catch(() => {
            this.submitting = false
          })
        } else {
          this.submitting = false
        }
      })
    },
    /**
     * 打开修改弹框<父组件调用>
     */
    handleUpdateEditShow(row) {
      // console.log('row', JSON.parse(JSON.stringify(row)))
      this.resetTemp()
      this.dialogVisible = true
      fileInfo({ id: row.id }).then(res => {
        // console.log('详情', JSON.parse(JSON.stringify(res)))
        this.temp = res.data
      })
      this.$nextTick(() => {
        this.$refs['dataForm'].clearValidate()
      })
    },
    /**
     * 修改(确认)
     */
    updateData() {
      this.submitting = true
      this.$refs['dataForm'].validate((valid) => {
        if (valid) {
          const tempData = Object.assign({}, this.temp)
          fileUpdate(tempData).then(res => {
            // console.log('res', JSON.parse(JSON.stringify(res)))
            this.dialogVisible = false
            this.$parent.refreshTab() // 子组件调用父组件刷新表方法
            this.submitting = false
            this.$notify({ title: this.$t('text.success'), message: '修改成功!', type: 'success', duration: 2000 })
          }).catch(() => {
            this.submitting = false
          })
        } else {
          this.submitting = false
        }
      })
    },
    hide() {
      this.resetTemp()
      this.dialogVisible = false
    },
    resetTemp() {
      this.submitting = false
      this.temp = { ... this.defaultTemp }
    },
    handleDrag() {
    }
  }
}
</script>

<style lang="scss" scoped>
  >>>.el-checkbox{
    margin-right: 19px;
  }
  >>>.el-progress-bar{
    width: 97%;
  }
</style>

好了,到此就结束了,希望这篇文章能帮助到大家


本文转载自: https://blog.csdn.net/qq_36509946/article/details/128914262
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