阅读目录
1.前言2.文件上传3.进度条4.全部代码5.效果演示
1.前言
之前在做项目的时候,需要实现一个文件上传组件并且需要有文件上传进度条,现将之前的实现过程简单记录一下,希望可以帮助到有需要的人。
项目用的是Vue框架,UI库使用的是element UI,前后端交互请求使用的是Vue官方推荐的axios。其中,UI方面主要使用了element UI库中的Upload
文件上传组件、Progress
进度条组件。
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2.文件上传
文件上传功能使用element UI库中的Upload
文件上传组件实现,代码如下:
<div class="uploadfile"><el-uploadref="upload"class="upload-demo":before-upload="beforeUpload"drag:auto-upload="false":on-exceed="handleExceed"><i class="el-icon-upload"></i><div class="el-upload__text">将文件拖到此处,或<em>点击选择文件</em></div></el-upload><el-button style="margin-left: 10px;" size="small" type="success" @click="submitUpload">上传</el-button></div>
当点击上传按钮,会触发submitUpload
函数,同时该函数也会触发beforeUpload
函数:
beforeUpload(file){let fd = new FormData();fd.append('file', file);let config = {onUploadProgress: progressEvent => {let complete = (progressEvent.loaded / progressEvent.total ).toFixed(2) * 100 ;this.percentage = complete;if (this.percentage >= 100){this.dialogVisible = true}},headers: {'Content-Type': 'multipart/form-data'}};this.$axios.post(this.url,fd,config).then((res)=>{}).catch((err)=>{})},submitUpload(){this.loading = true;this.tips = '正在上传中。。。';this.$refs.upload.submit();},
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3.进度条
当点击上传后,整个页面被遮罩层遮挡,并显示上传进度:
<!--遮罩层--><div class="loading" v-if="loading" ><h4 class="tips">{{tips}}</h4><!--进度条--><el-progress type="line" :percentage="percentage" class="progress" :show-text="true"></el-progress></div>
进度条关键代码:
进度条的实现主要依靠axios
中提供的onUploadProgress
函数,该函数提供了文件已上传部分的大小progressEvent.loaded
和文件总大小progressEvent.total
,利用这两个数据我们就可以计算出已经上传文件的进度。
beforeUpload(file){let fd = new FormData();fd.append('file', file);let config = {onUploadProgress: progressEvent => {//progressEvent.loaded:已上传文件大小//progressEvent.total:被上传文件的总大小let complete = (progressEvent.loaded / progressEvent.total ).toFixed(2) * 100 ;this.percentage = complete;if (this.percentage >= 100){this.dialogVisible = true}},headers: {'Content-Type': 'multipart/form-data'}};this.$axios.post(this.url,fd,config).then((res)=>{}).catch((err)=>{})},
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4.全部代码
封装好组件后,我们只需在父组件中调用该组件并传入文件上传到的目的url即可。
<UploadFile :url="/test/"/>
以下是该组件UploadFile.vue
的全部代码:
<template><div><!--文件上传入口--><div class="uploadfile"><el-uploadref="upload"class="upload-demo":before-upload="beforeUpload"drag:auto-upload="false":on-exceed="handleExceed"><i class="el-icon-upload"></i><div class="el-upload__text">将文件拖到此处,或<em>点击选择文件</em></div></el-upload><el-button style="margin-left: 10px;" size="small" type="success" @click="submitUpload">上传</el-button></div><!--遮罩层--><div class="loading" v-if="loading" ><h4 class="tips">{{tips}}</h4><!--进度条--><el-progress type="line" :percentage="percentage" class="progress" :show-text="true"></el-progress></div><!--上传完成提示对话框--><el-dialogtitle="提示":visible="dialogVisible"width="30%":modal-append-to-body='false'><span>文件上传成功</span><span slot="footer" class="dialog-footer"><el-button type="primary" @click="ensure">确 定</el-button></span></el-dialog></div></template><script>import Vue from 'vue'import {Upload,Button,Progress,Dialog} from 'element-ui';Vue.use(Upload);Vue.use(Button);Vue.use(Progress);Vue.use(Dialog);export default {name: "UploadFile",data(){return {loading:false,percentage:0,tips:'',dialogVisible:false}},props:['url'],methods:{beforeUpload(file){let fd = new FormData();fd.append('file', file);let config = {onUploadProgress: progressEvent => {//progressEvent.loaded:已上传文件大小//progressEvent.total:被上传文件的总大小let complete = (progressEvent.loaded / progressEvent.total ).toFixed(2) * 100 ;this.percentage = complete;if (this.percentage >= 100){this.dialogVisible = true}},headers: {'Content-Type': 'multipart/form-data'}};this.$axios.post(this.url,fd,config).then((res)=>{}).catch((err)=>{})},handleExceed(){},submitUpload(){this.loading = true;this.tips = '正在上传中。。。';this.$refs.upload.submit();},ensure(){this.dialogVisible = false;this.loading = false;}}}</script><style scoped>.uploadfile{width: 200px;height: 200px;position: absolute;top: 50%;left: 50%;margin-left: -100px;margin-top: -100px;}.loading{position: absolute;left: 0;top: 0;right: 0;bottom: 0;background: black;opacity: 0.8;}.progress{width: 200px;height: 200px;position: absolute;top: 50%;left: 50%;margin-left: -100px;margin-top: -100px;}.tips{color: #409eff;position: absolute;top: 50%;left: 50%;margin-left: -100px;margin-top: -150px;}</style>
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5.效果演示
主要说明原理,UI就自行发挥吧。
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