前端功能:Vue实现图片/文件的上传与内容解析
Posted SunFlower914
tags:
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效果页面:
效果描述:可以点击按钮选择规定的类型文件,也可以将文件拖到右侧后解析文件内容
实现代码:
1.自定义一个上方功能模块的组件(组件名UploadExcel.vue)
<template>
<div class="drop">
<input
ref="excel-upload-input"
class="excel-upload-input"
type="file"
accept=".xlsx, .xls"
@change="handleClick"
>
<div class="left">
<el-button :loading="loading" type="primary" @click="handleUpload">
点击上传
</el-button>
</div>
<div
class="right"
@drop="handleDrop"
@dragover="handleDragover"
@dragenter="handleDragover"
>
将文件托到此处
</div>
</div>
</template>
<script>
import XLSX from 'xlsx'
export default
name: 'UploadExcel',
props:
beforeUpload: Function, // eslint-disable-line 上传前处理,上传了才执行
onSuccess: Function // eslint-disable-line 解析成功后的处理
,
data()
return
loading: false,
excelData:
header: null, // 存储解析后的excel头部
results: null // 存储解析后的excel列表
,
methods:
generateData( header, results )
this.excelData.header = header
this.excelData.results = results
// 如果有onSuccess就执行,同时传出两个数据onSuccess(header, results)
this.onSuccess && this.onSuccess(this.excelData)
,
handleDrop(e)
e.stopPropagation()
e.preventDefault()
if (this.loading) return
const files = e.dataTransfer.files
if (files.length !== 1)
this.$message.error('Only support uploading one file!')
return
const rawFile = files[0] // only use files[0]
if (!this.isExcel(rawFile))
s
this.$message.error(
'Only supports upload .xlsx, .xls, .csv suffix files'
)
return false
this.upload(rawFile)
e.stopPropagation()
e.preventDefault()
,
handleDragover(e)
e.stopPropagation()
e.preventDefault()
e.dataTransfer.dropEffect = 'copy'
,
handleUpload()
this.$refs['excel-upload-input'].click()
,
handleClick(e)
const files = e.target.files
const rawFile = files[0] // only use files[0]
if (!rawFile) return
this.upload(rawFile)
,
upload(rawFile)
this.$refs['excel-upload-input'].value = null // fix can't select the same excel
// 如果没有通过props传参beforeUpload,它的默认值是undefined,转换成boolean是false
if (!this.beforeUpload)
// 经过if判断,如果是false就对文件进行解析
this.readerData(rawFile)
return
// 如果传入了beforeUpload,执行该方法后要返回一个boolean值,Boolean为true才执行
const before = this.beforeUpload(rawFile)
if (before)
this.readerData(rawFile)
,
// 解析Excel的数据
readerData(rawFile)
this.loading = true
return new Promise((resolve, reject) =>
const reader = new FileReader()
reader.onload = (e) =>
const data = e.target.result
const workbook = XLSX.read(data, type: 'array' )
const firstSheetName = workbook.SheetNames[0]
const worksheet = workbook.Sheets[firstSheetName]
const header = this.getHeaderRow(worksheet)
const results = XLSX.utils.sheet_to_json(worksheet)
this.generateData( header, results )
this.loading = false
resolve()
reader.readAsArrayBuffer(rawFile)
)
,
// 解析Excel的数据
getHeaderRow(sheet)
const headers = []
const range = XLSX.utils.decode_range(sheet['!ref'])
let C
const R = range.s.r
/* start in the first row */
for (C = range.s.c; C <= range.e.c; ++C)
/* walk every column in the range */
const cell = sheet[XLSX.utils.encode_cell( c: C, r: R )]
/* find the cell in the first row */
let hdr = 'UNKNOWN ' + C // <-- replace with your desired default
if (cell && cell.t) hdr = XLSX.utils.format_cell(cell)
headers.push(hdr)
return headers
,
isExcel(file)
return /\\.(xlsx|xls|csv)$/.test(file.name)
</script>
<style scoped lang="scss">
.excel-upload-input
display: none;
z-index: -9999;
.drop
border: 2px dashed #bbb;
width: 600px;
height: 160px;
line-height: 160px;
margin: 0px auto;
display: flex;
justify-content: center;
align-items: center;
border-radius: 5px;
text-align: center;
color: #bbb;
.left
flex: 1;
border-right: 1px dashed #bbb;
.right
flex: 1;
</style>
2.全局注册后使用组件
<template>
<div>
<UploadExcel :before-upload="beforeUpload" :on-success="onSuccess" />
</div>
</template>
<script>
export default
name: '',
data()
return
,
computed: ,
created() ,
methods:
// 限制上传文件的大小和类型
beforeUpload(file)
console.log(file)
// 规定只能是.png类型的文件
const ispng = file.type === 'image/png'
// 规定所上传的文件不能>1M
const is1M = file.size / 1024 / 1024 <= 1
if (!ispng)
this.$message.error('请输入png格式图片')
if (!is1M)
this.$message.error('请上传1M以内大小的文件')
return ispng && is1M
,
// 读取上传xlsx文件的内容
onSuccess( header, results )
console.log(header, 'header', results, 'results')
</script>
<style lang="less" scoped></style>
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