<template>
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<div>
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<input ref="excel-upload-input" class="excel-upload-input" type="file" accept=".xlsx, .xls" @change="handleClick">
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<div class="drop" @drop="handleDrop" @dragover="handleDragover" @dragenter="handleDragover">
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Drop excel file here or
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<el-button :loading="loading" style="margin-left:16px;" size="small" type="primary" @click="handleUpload">
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Browse
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</el-button>
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</div>
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</div>
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</template>
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<script>
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import { defineComponent } from 'vue';
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import * as XLSX from 'xlsx';
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export default defineComponent({
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props: {
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beforeUpload: {
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type: Function,
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// eslint-disable-next-line @typescript-eslint/no-empty-function
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default: () => {}
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},
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onSuccess: {
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type: Function,
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// eslint-disable-next-line @typescript-eslint/no-empty-function
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default: () => {}
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}
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},
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data() {
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return {
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loading: false,
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excelData: {
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header: null,
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results: null
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}
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};
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},
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methods: {
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generateData({ header, results }) {
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this.excelData.header = header;
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this.excelData.results = results;
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this.onSuccess && this.onSuccess(this.excelData);
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},
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handleDrop(e) {
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e.stopPropagation();
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e.preventDefault();
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if (this.loading) return;
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const files = e.dataTransfer.files;
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if (files.length !== 1) {
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ElMessage.error('Only support uploading one file!');
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return;
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}
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const rawFile = files[0]; // only use files[0]
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if (!this.isExcel(rawFile)) {
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ElMessage.error('Only supports upload .xlsx, .xls, .csv suffix files');
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return false;
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}
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this.upload(rawFile);
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e.stopPropagation();
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e.preventDefault();
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},
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handleDragover(e) {
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e.stopPropagation();
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e.preventDefault();
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e.dataTransfer.dropEffect = 'copy';
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},
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handleUpload() {
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this.$refs['excel-upload-input'].click();
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},
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handleClick(e) {
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const files = e.target.files;
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const rawFile = files[0]; // only use files[0]
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if (!rawFile) return;
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this.upload(rawFile);
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},
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upload(rawFile) {
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this.$refs['excel-upload-input'].value = null; // fix can't select the same excel
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if (!this.beforeUpload) {
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this.readerData(rawFile);
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return;
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}
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const before = this.beforeUpload(rawFile);
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if (before) {
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this.readerData(rawFile);
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}
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},
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readerData(rawFile) {
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this.loading = true;
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return new Promise((resolve) => {
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const reader = new FileReader();
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reader.onload = e => {
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const data = e.target.result;
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const workbook = XLSX.read(data, { type: 'array' });
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const firstSheetName = workbook.SheetNames[0];
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const worksheet = workbook.Sheets[firstSheetName];
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const header = this.getHeaderRow(worksheet);
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const results = XLSX.utils.sheet_to_json(worksheet);
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this.generateData({ header, results });
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this.loading = false;
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resolve();
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};
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reader.readAsArrayBuffer(rawFile);
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});
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},
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getHeaderRow(sheet) {
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const headers = [];
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const range = XLSX.utils.decode_range(sheet['!ref']);
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let C;
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const R = range.s.r;
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/* start in the first row */
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for (C = range.s.c; C <= range.e.c; ++C) { /* walk every column in the range */
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const cell = sheet[XLSX.utils.encode_cell({ c: C, r: R })];
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/* find the cell in the first row */
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let hdr = 'UNKNOWN ' + C; // <-- replace with your desired default
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if (cell && cell.t) hdr = XLSX.utils.format_cell(cell);
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headers.push(hdr);
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}
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return headers;
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},
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isExcel(file) {
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return /\.(xlsx|xls|csv)$/.test(file.name);
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}
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}
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});
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</script>
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<style scoped>
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.excel-upload-input{
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display: none;
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z-index: -9999;
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}
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.drop{
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border: 2px dashed #bbb;
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width: 600px;
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height: 160px;
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line-height: 160px;
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margin: 0 auto;
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font-size: 24px;
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border-radius: 5px;
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text-align: center;
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color: #bbb;
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position: relative;
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}
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</style>
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