Vue2实现txt文件在线预览的代码示例
作者:_Feliz
txt文件在线预览不需要下载另外的插件,主要有两种形式,一种是上传完成后实现预览;另一种是后端提供文件下载接口,获取文件在线地址实现预览;本文给大家介绍了Vue2实现txt文件在线预览的代码示例,需要的朋友可以参考下
一、上传完成后实现预览
<template> <!-- txt文件预览 --> <div> <el-dialog title="文件预览" :visible="dialogVisible" show-close append-to-body width="60%" :before-close="cancelDialog" > <input type="file" @change="handleFileChange"> <div class="panel-box" v-html="txt"></div> <div slot="footer" class="dialog-footer tc"> <button class="btn-submit btn-submit-sm" @click="cancelDialog()">关闭</button> </div> </el-dialog> </div> </template> <script> export default { name:'txtFilePreview', data() { return { dialogVisible:false, txt:'', }; }, methods: { previewFile(){ this.dialogVisible = true; }, handleFileChange(e){ const file = e.target.files[0]; if (!file) { return; } const that = this; const reader = new FileReader(); reader.onload = function(e) { that.txt = e.target.result.split('\n').join('<br />'); }; reader.onerror = function(error) { console.error('Error: ', error); }; reader.readAsText(file); }, cancelDialog(){ this.dialogVisible = false; }, } }; </script> <style lang="scss" scoped> </style>
实现效果:
二、后端提供文件下载接口实现预览
<template> <!-- txt文件预览 --> <div> <el-dialog title="文件预览" :visible="dialogVisible" show-close append-to-body width="60%" :before-close="cancelDialog" > <div class="panel-box" v-html="txt"></div> <div slot="footer" class="dialog-footer tc"> <button class="btn-submit btn-submit-sm" @click="cancelDialog()">关闭</button> </div> </el-dialog> </div> </template> <script> export default { name:'txtFilePreview', data() { return { dialogVisible:false, txt:'', }; }, methods: { previewFile(event,docId) { event.stopPropagation(); this.dialogVisible = true; const inParam = { DOC_ID: docId, STAFF_ID: this.$store.getters.staffId, STAFF_NAME: this.$store.getters.staffName, SYS_USER_CODE: this.$store.getters.systemUserCode }; const loading = this.$commonUtil.loading.open() this.$txtPreview(this.mciApi.common.file.downFile, { ...inParam }).then(r => { loading.close() // 根据文件地址解析txt文件内容 this.$axios.get(r,{ responseType:"blob", transformResponse: [ async (data)=>{ return await this.transformData(data); }, ], }).then(res=>{ res.data.then((data)=>{ this.txt = data ? data.split('\n').join('<br />') : ''; }) }) }).catch((e) => { loading.close() }) }, transformData(data){ return new Promise((resolve)=>{ let reader = new FileReader(); reader.readAsText(data,'UTF-8'); reader.onload = ()=>{ resolve(reader.result) } }) }, cancelDialog(){ this.dialogVisible = false; }, } }; </script> <style lang="scss" scoped> </style>
Tips:
$txtPreview:是封装后的post请求;
this.mciApi.common.file.downFile:是后端提供的文件下载方法,返回一个文件流数据。获取数据后将文件流进行地址转换作为结果返回。
文件流转url地址:
const blob = new Blob([content], { type: 'application/text' }); const url = window.URL.createObjectURL(blob);
实现效果:
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