el-upload實現(xiàn)上傳文件并展示進(jìn)度條功能
el-upload實現(xiàn)上傳文件并展示進(jìn)度條
el-upload在實現(xiàn)文件上傳時無法觸發(fā)on-progress鉤子,即使調(diào)用后端接口并成功的情況下都無法觸發(fā),可以通過如下配置來解決:
const config = { onUploadProgress: progressEvent => { if (progressEvent.lengthComputable) { this.uploadProgress = Math.round((progressEvent.loaded / progressEvent.total) * 100) console.log('progressEvent>>', progressEvent) console.log('uploadProgress>>', _this.uploadProgress) } } }
隨后將config添加至調(diào)用后端接口,即可成功獲取進(jìn)度~
html:
前端-上傳文件獲取進(jìn)度條: <el-upload v-show="!fileList.length" ref="fileUpload" class="upload-demo" style="display: inline-block;height: 32px;margin-left: 8px" action="#" :file-list="fileList" :http-request="uploadVersion" :on-change="handleChange" :on-success="handleSuccess" :on-progress="handleProgress" :on-error="handleError" :auto-upload="true" :show-file-list="false" > <!-- icon_upload.svg--> <el-button type="primary" style="height: 32px;display: flex;align-items: center"><svg-icon icon-class="icon_upload" style="margin-right: 8px" />上傳文件</el-button> <!-- <el-input v-model="uploadForm.filename" placeholder="請選擇">--> <!-- <!– <template slot="append"><el-button–>--> <!-- <!– size="mini"–>--> <!-- <!– >–>--> <!-- <!– 上傳文件–>--> <!-- <!– </el-button></template>–>--> <!-- </el-input>--> </el-upload> <!-- <el-button size="small" @click="sendClick">上傳</el-button>--> <div v-if="fileElProgress"> <div class="el-progress-div"> <div><div v-loading="true" style="display: inline-block;width: 24px; height: 16px; padding-right: 8px;" />{{ fileName }}</div> <span> <span style="display: inline-block;margin-right: 8px">{{ progressPercent }}%</span> <el-button type="text" @click="cancelUpload">取消</el-button> </span> </div> <el-progress :percentage="progressPercent" :text-inside="false" :color="customColors" :stroke-width="2" /> <!-- :stroke-width="16" status="scuccess"--> </div> <template v-if="!fileElProgress"> <div v-for="item in fileList" :key="item.name" class="fail-list"> <div class="list-item"> <span :style="{color:showFailTip?'#FF3D00':'#fff' }"> <svg-icon :icon-class="showFailTip? 'icon_error_file': 'icon_success_file'" /> {{ item.name }} </span> <span style="float: right;display: flex;align-items: center;"> <span style="color: #878D99;display: inline-block;margin-right: 16px">{{ showFailTip ? '失敗':'成功' }}</span> <!-- <span>{{ '失敗' }}</span>--> <el-button style="color: #00E3FF" type="text" size="small" @click="fileList = []">刪除</el-button> <el-button v-show="showFailTip" style="color: #00E3FF" type="text" size="small" @click="sendClick">重新上傳</el-button> </span> </div> </div> </template>
JS部分
data() { return { // 進(jìn)度條 fileList: [], showFailTip: false, customColors: [ { color: 'rgba(223,228,237,0.10)', percentage: 0 }, { color: '#00adc9', percentage: 100 } ], fileElProgress: false, fileProgressText: '', progressPercent: 0, } methodss:{ uploadVersion(params) { const _this = this this.uploadForm.filename = params.file.name this.fileFormData = new FormData() this.fileFormData.append('file', params.file) this.fileFormData.append('md5File', params.file) this.fileName = params.file.name const config = { onUploadProgress: progressEvent => { if (progressEvent.lengthComputable) { _this.uploadProgress = Math.round((progressEvent.loaded / progressEvent.total) * 100) console.log('progressEvent>>', progressEvent) console.log('uploadProgress>>', _this.uploadProgress) this.fileElProgress = true if (this.progressPercent < 99) { this.progressPercent = _this.uploadProgress } else { this.fileProgressText = '正在上傳' } } } } uploadFile(this.fileFormData, config).then(res => { if (res.data === 'success') { this.fileProgressText = '上傳成功' } else { this.showFailTip = true } this.fileElProgress = false }) }, } },
el-upload的使用方法
基本使用方法
el-upload的基本使用方法很簡單,參考官網(wǎng)的例子即可,這里記錄幾個常用的屬性
<el-col :span="12"> <el-form-item label="附件" prop="attachments"> <el-upload class="upload" name="file" :action="doUpload" :headers="headers" :before-remove="beforeRemove" :limit="3" :on-exceed="handleExceed" :before-upload="handleBeforeUpload" :on-success="uploadSuccess" :multiple="true" :file-list="fileList" > <el-button type="text" size="small" icon="el-icon-upload">點擊上傳</el-button> </el-upload> </el-form-item> </el-col>
- class:可以自己修改一下樣式
- name:這個name很重要,錯了后臺接收不到文件,官方是這樣解釋的 上傳的文件字段名 ,實際上就是后端對應(yīng)的接口參數(shù)的名字,后端可能是這么定義的 public AjaxResult uploadFile(MultipartFile file) throws Exception
- action:就是后端接收文件的接口地址
- headers:有些程序用token作為鑒權(quán)依據(jù),通常把token放在header中,headers長這樣子:headers: { Authorization: this.$store.getters.token }
- beforeRemove:刪除之前可以彈出個提示框,問問要不要刪除,就像這樣 : return this.$confirm(確定移除 ${file.name}?)
- on-exceed:官方這么解釋文件超出個數(shù)限制時的鉤子 ,一般應(yīng)用這個鉤子彈出一個提示信息,告訴用戶文件個數(shù)超過限制了
- before-upload:官方這么解釋上傳文件之前的鉤子,參數(shù)為上傳的文件,若返回 false 或者返回 Promise 且被 reject,則停止上傳。
我們可以在上傳之前判斷一下用戶選擇的文件是不是符合要求,比如文件類型是否正確、文件大小是否超限等。例如:
handleBeforeUpload(file) { const uploadLimit = 2 const uploadTypes = ['jpg', 'png', 'doc', 'docx', 'xlsx', 'zip', 'rar', 'pdf'] const filetype = file.name.replace(/.+\./, '') const isRightSize = (file.size || 0) / 1024 / 1024 < uploadLimit if (!isRightSize) { this.$message.error('文件大小超過 ' + uploadLimit + 'MB') return false } if (uploadTypes.indexOf(filetype.toLowerCase()) === -1) { this.$message.warning({ message: '請上傳后綴名為jpg、png、txt、pdf、doc、docx、xlsx、zip或rar的附件' }) return false } return true }
- multiple:是否支持選擇多個文件
- file-list:在查看數(shù)據(jù)的時候,如果我們要回顯已經(jīng)上傳的文件,就需要設(shè)置這個屬性了
fileList = [{name:"附件4.png", fileName:"/profile/upload/2020/07/21/7e6735cbc848c40a2f2242b56d09fe58.png"}, {name:"新建文本文檔.txt", fileName:"/profile/upload/2020/07/21/34c6389353856c9429405360eaec864d.txt"}]
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