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<template>
<div>
<input ref="excel-upload-input" class="excel-upload-input" type="file" accept=".xlsx, .xls" @change="handleClick">
<div class="drop" @drop="handleDrop" @dragover="handleDragover" @dragenter="handleDragover">
Drop excel file here or
<el-button :loading="loading" style="margin-left:16px;" size="mini" type="primary" @click="handleUpload">
Browse
</el-button>
</div>
</div>
</template>
<script>
import XLSX from 'xlsx';
export default {
props: {
beforeUpload: Function, // eslint-disable-line
onSuccess: Function, // eslint-disable-line
},
data() {
return {
loading: false,
excelData: {
header: null,
results: null,
},
};
},
methods: {
generateData({ header, results }) {
this.excelData.header = header;
this.excelData.results = 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.$message.error('Only support uploading one file!');
return;
}
const rawFile = files[0]; // only use files[0]
if (!this.isExcel(rawFile)) {
this.$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
if (!this.beforeUpload) {
this.readerData(rawFile);
return;
}
const before = this.beforeUpload(rawFile);
if (before) {
this.readerData(rawFile);
}
},
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);
});
},
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>
.excel-upload-input{
display: none;
z-index: -9999;
}
.drop{
border: 2px dashed #bbb;
width: 600px;
height: 160px;
line-height: 160px;
margin: 0 auto;
font-size: 24px;
border-radius: 5px;
text-align: center;
color: #bbb;
position: relative;
}
</style>
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