<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="mini" type="primary" @click="handleUpload">Browse</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 XLSX from "xlsx";
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export default {
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props: {
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beforeUpload: Function, // eslint-disable-line
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onSuccess: Function// eslint-disable-line
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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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this.$message.error("Only support uploading one file!");
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return;
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}
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const rawFile = files[0]; // only use files[0]
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if (!this.isExcel(rawFile)) {
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this.$message.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, reject) => {
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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 fixedData = this.fixData(data);
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const workbook = XLSX.read(btoa(fixedData), { type: "base64" });
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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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fixData(data) {
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let o = "";
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let l = 0;
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const w = 10240;
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for (; l < data.byteLength / w; ++l) o += String.fromCharCode.apply(null, new Uint8Array(data.slice(l * w, l * w + w)));
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o += String.fromCharCode.apply(null, new Uint8Array(data.slice(l * w)));
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return o;
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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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