怎么在Element-UI中使用Upload上傳文件前端緩存處理?針對(duì)這個(gè)問題,這篇文章詳細(xì)介紹了相對(duì)應(yīng)的分析和解答,希望可以幫助更多想解決這個(gè)問題的小伙伴找到更簡(jiǎn)單易行的方法。
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首先定義一個(gè)jsonContent, 我們的目標(biāo)是將本地選取的文件轉(zhuǎn)換為JSON賦值給jsonContent
然后我們的模板文件是利用el-dialog和el-upload兩個(gè)組件組合:這里停止文件自動(dòng)上傳模式:auto-upload="false"
<el-button type="primary" @click="dialogVisible = true">Load from File</el-button> <el-dialog title="Load JSON document from file" :visible.sync="dialogVisible"> <el-upload :file-list="uploadFiles" action="alert" :auto-upload="false" multiple :on-change="loadJsonFromFile"> <el-button size="small" type="primary">Select a file</el-button> <div slot="tip">upload only jpg/png files, and less than 500kb</div> </el-upload> <span slot="footer"> <el-button type="primary" @click="dialogVisible = false">cancel</el-button> <el-button type="primary" @click="loadJsonFromFileConfirmed">confirm</el-button> </span> </el-dialog>
最后通過html5的filereader對(duì)變量uploadFiles中的文件進(jìn)行讀取并賦值給jsonContent
if (this.uploadFiles) { for (let i = 0; i < this.uploadFiles.length; i++) { let file = this.uploadFiles[i] console.log(file.raw) if (!file) continue let reader = new FileReader() reader.onload = async (e) => { try { let document = JSON.parse(e.target.result) console.log(document) } catch (err) { console.log(`load JSON document from file error: ${err.message}`) this.showSnackbar(`Load JSON document from file error: ${err.message}`, 4000) } } reader.readAsText(file.raw) } }
為方便測(cè)試,以下是完整代碼:
<template> <div> <el-button type="primary" @click="dialogVisible = true">Load from File</el-button> <el-dialog title="Load JSON document from file" :visible.sync="dialogVisible"> <el-upload :file-list="uploadFiles" action="alert" :auto-upload="false" multiple :on-change="loadJsonFromFile"> <el-button size="small" type="primary">Select a file</el-button> <div slot="tip">upload only jpg/png files, and less than 500kb</div> </el-upload> <span slot="footer"> <el-button type="primary" @click="dialogVisible = false">cancel</el-button> <el-button type="primary" @click="loadJsonFromFileConfirmed">confirm</el-button> </span> </el-dialog> </div> </template> <script> export default { data () { return { // data for upload files uploadFilename: null, uploadFiles: [], dialogVisible: false } }, methods: { loadJsonFromFile (file, fileList) { this.uploadFilename = file.name this.uploadFiles = fileList }, loadJsonFromFileConfirmed () { console.log(this.uploadFiles) if (this.uploadFiles) { for (let i = 0; i < this.uploadFiles.length; i++) { let file = this.uploadFiles[i] console.log(file.raw) if (!file) continue let reader = new FileReader() reader.onload = async (e) => { try { let document = JSON.parse(e.target.result) console.log(document) } catch (err) { console.log(`load JSON document from file error: ${err.message}`) this.showSnackbar(`Load JSON document from file error: ${err.message}`, 4000) } } reader.readAsText(file.raw) } } this.dialogVisible = false } } } </script>
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