最近做的excle表格导出功能。
请求API导出表格。
本地导出表格。
安装npm install file-saver xlsx --save
excel.js 文件
import { saveAs } from 'file-saver'
import XLSX from 'xlsx'
function generateArray(table) {
const out = []
const rows = table.querySelectorAll('tr')
const ranges = []
for (let R = 0; R < rows.length; ++R) {
const outRow = []
const row = rows[R]
const columns = row.querySelectorAll('td')
for (let C = 0; C < columns.length; ++C) {
const cell = columns[C]
let colspan = cell.getAttribute('colspan')
let rowspan = cell.getAttribute('rowspan')
let cellValue = cell.innerText
if (cellValue !== '' && cellValue === +cellValue) cellValue = +cellValue
ranges.forEach(function (range) {
if (
R >= range.s.r &&
R <= range.e.r &&
outRow.length >= range.s.c &&
outRow.length <= range.e.c
) {
for (let i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null)
}
})
if (rowspan || colspan) {
rowspan = rowspan || 1
colspan = colspan || 1
ranges.push({
s: {
r: R,
c: outRow.length,
},
e: {
r: R + rowspan - 1,
c: outRow.length + colspan - 1,
},
})
}
outRow.push(cellValue !== '' ? cellValue : null)
if (colspan) for (let k = 0; k < colspan - 1; ++k) outRow.push(null)
}
out.push(outRow)
}
return [out, ranges]
}
function datenum(v, date1904) {
if (date1904) v += 1462
const epoch = Date.parse(v)
return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000)
}
function sheet_from_array_of_arrays(data) {
const ws = {}
const range = {
s: {
c: 10000000,
r: 10000000,
},
e: {
c: 0,
r: 0,
},
}
for (let R = 0; R !== data.length; ++R) {
for (let C = 0; C !== data[R].length; ++C) {
if (range.s.r > R) range.s.r = R
if (range.s.c > C) range.s.c = C
if (range.e.r < R) range.e.r = R
if (range.e.c < C) range.e.c = C
const cell = {
v: data[R][C],
}
if (cell.v === null) continue
const cell_ref = XLSX.utils.encode_cell({
c: C,
r: R,
})
if (typeof cell.v === 'number') cell.t = 'n'
else if (typeof cell.v === 'boolean') cell.t = 'b'
else if (cell.v instanceof Date) {
cell.t = 'n'
cell.z = XLSX.SSF._table[14]
cell.v = datenum(cell.v)
} else cell.t = 's'
ws[cell_ref] = cell
}
}
if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range)
return ws
}
function Workbook() {
if (!(this instanceof Workbook)) return new Workbook()
this.SheetNames = []
this.Sheets = {}
}
function s2ab(s) {
const buf = new ArrayBuffer(s.length)
const view = new Uint8Array(buf)
for (let i = 0; i !== s.length; ++i) view[i] = s.charCodeAt(i) & 0xff
return buf
}
export function export_table_to_excel(id) {
const theTable = document.getElementById(id)
const oo = generateArray(theTable)
const ranges = oo[1]
const data = oo[0]
const ws_name = 'SheetJS'
const wb = new Workbook(),
ws = sheet_from_array_of_arrays(data)
ws['!merges'] = ranges
wb.SheetNames.push(ws_name)
wb.Sheets[ws_name] = ws
const wbout = XLSX.write(wb, {
bookType: 'xlsx',
bookSST: false,
type: 'binary',
})
saveAs(
new Blob([s2ab(wbout)], {
type: 'application/octet-stream',
}),
'test.xlsx'
)
}
export function export_json_to_excel({
multiHeader = [],
header,
data,
filename,
merges = [],
autoWidth = true,
bookType = 'xlsx',
} = {}) {
filename = filename || 'excel-list'
data = [...data]
data.unshift(header)
for (let i = multiHeader.length - 1; i > -1; i--) {
data.unshift(multiHeader[i])
}
const ws_name = 'SheetJS'
const wb = new Workbook(),
ws = sheet_from_array_of_arrays(data)
if (merges.length > 0) {
if (!ws['!merges']) ws['!merges'] = []
merges.forEach((item) => {
ws['!merges'].push(XLSX.utils.decode_range(item))
})
}
if (autoWidth) {
const colWidth = data.map((row) =>
row.map((val) => {
if (val === null) {
return {
wch: 10,
}
} else if (val.toString().charCodeAt(0) > 255) {
return {
wch: val.toString().length * 2,
}
} else {
return {
wch: val.toString().length,
}
}
})
)
const result = colWidth[0]
for (let i = 1; i < colWidth.length; i++) {
for (let j = 0; j < colWidth[i].length; j++) {
if (result[j]['wch'] < colWidth[i][j]['wch']) {
result[j]['wch'] = colWidth[i][j]['wch']
}
}
}
ws['!cols'] = result
}
wb.SheetNames.push(ws_name)
wb.Sheets[ws_name] = ws
const wbout = XLSX.write(wb, {
bookType: bookType,
bookSST: false,
type: 'binary',
})
saveAs(
new Blob([s2ab(wbout)], {
type: 'application/octet-stream',
}),
`${filename}.${bookType}`
)
}