@senlinz/import-export-wasm
v0.0.1-beta.5
Published
Rust WebAssembly for import/export excel files
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@senlinz/import-export-wasm
@senlinz/import-export-wasm is the Rust WebAssembly core library for the @senlinz/import-export library. It provides the core logic for handling Excel data in browser environments.
Note: This library is currently in beta. Features and APIs may change.
Features
- Rust WebAssembly core for efficient Excel data handling.
- Read using calamine.
- Write using rust_xlsxwriter.
Usage
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Demo (@senlin/import-export-wasm)</title>
</head>
<button id="downloadTemplate">Download Template</button>
<button id="exportWithData">Export With Data</button>
<button id="importWithData">Import With Data</button>
<a id="download" style="display: none"></a>
<input type="file" accept=".xlsx" id="file" style="display: none">
<body>
<script type="module">
import initAsync, { createTemplate, exportData, importData, ExcelInfo, ExcelColumnInfo, ExcelData, ExcelRowData, ExcelColumnData } from 'https://cdn.jsdelivr.net/npm/@senlinz/import-export-wasm/pkg/imexport_wasm.js';
await initAsync({ path: 'https://cdn.jsdelivr.net/npm/@senlinz/import-export-wasm/pkg/imexport_wasm_bg.wasm' });
const downloadEl = document.getElementById('download');
const fileEl = document.getElementById('file');
fileEl.addEventListener('change', fileChange);
document.getElementById('downloadTemplate').addEventListener('click', downloadTemplate);
document.getElementById('exportWithData').addEventListener('click', exportWithData);
document.getElementById('importWithData').addEventListener('click', importWithData);
const res = await fetch('https://cdn.jsdelivr.net/npm/@senlinz/import-export-wasm/pkg/imexport_wasm_bg.wasm');
const bytes = await res.arrayBuffer();
function downloadTemplate() {
const info = getExcelInfo();
download(info.name, createTemplate(info));
}
function exportWithData() {
const info = getExcelInfo();
const data = new ExcelData([
new ExcelRowData([
new ExcelColumnData("name", "Tom"),
new ExcelColumnData("age", "12"),
new ExcelColumnData("category", "Cat")
]),
new ExcelRowData([
new ExcelColumnData("name", "Jerry"),
new ExcelColumnData("age", "10"),
new ExcelColumnData("category", "Mouse")
])
]);
download(info.name, exportData(info, data));
}
function importWithData() {
fileEl.click();
}
function fileChange(e) {
const file = e.target.files[0];
const reader = new FileReader();
reader.onload = (e) => {
const data = new Uint8Array(e.target.result);
const info = getExcelInfo();
const excelData = importData(info, data);
console.log(toJson(excelData));
};
reader.readAsArrayBuffer(file);
}
function download(name, excelData) {
const blob = new Blob([excelData], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' });
const url = URL.createObjectURL(blob);
downloadEl.download = `${name}.xlsx`;
downloadEl.href = url;
downloadEl.click();
URL.revokeObjectURL(url);
}
function getExcelInfo() {
const excelName = "TomAndJerry";
const columns = [
new ExcelColumnInfo("name", "Name", 20),
new ExcelColumnInfo("age", "Age"),
new ExcelColumnInfo("category", "Category")
];
const info = new ExcelInfo(excelName, "sheet1", columns);
return info;
}
function toJson(excelData) {
const data = [];
const info = getExcelInfo();
for (let i = 0; i < excelData.rows.length; i++) {
const item = {};
let row = excelData.rows[i];
for (let j = 0; j < row.columns.length; j++) {
let column = row.columns[j];
item[column.key] = column.value;
}
data.push(item);
}
return data;
}
</script>
</body>
</html>