reactjs-legacy/sheetjs.jsx

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/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
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/* Notes:
- usage: `ReactDOM.render( <SheetJSApp />, document.getElementById('app') );`
- xlsx.full.min.js is loaded in the head of the HTML page
- this script should be referenced with type="text/babel"
- babel.js in-browser transpiler should be loaded before this script
*/
class SheetJSApp extends React.Component {
constructor(props) {
super(props);
this.state = {
data: [], /* Array of Arrays e.g. [["a","b"],[1,2]] */
cols: [] /* Array of column objects e.g. { name: "C", K: 2 } */
};
this.handleFile = this.handleFile.bind(this);
this.exportFile = this.exportFile.bind(this);
};
handleFile(file/*:File*/) {
/* Boilerplate to set up FileReader */
const reader = new FileReader();
const rABS = !!reader.readAsBinaryString;
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reader.onload = (e) => {
/* Parse data */
const bstr = e.target.result;
const wb = XLSX.read(bstr, {type:rABS ? 'binary' : 'array'});
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/* Get first worksheet */
const wsname = wb.SheetNames[0];
const ws = wb.Sheets[wsname];
/* Convert array of arrays */
const data = XLSX.utils.sheet_to_json(ws, {header:1});
/* Update state */
this.setState({ data: data, cols: make_cols(ws['!ref']) });
};
if(rABS) reader.readAsBinaryString(file); else reader.readAsArrayBuffer(file);
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};
exportFile() {
/* convert state to workbook */
const ws = XLSX.utils.aoa_to_sheet(this.state.data);
const wb = XLSX.utils.book_new();
XLSX.utils.book_append_sheet(wb, ws, "SheetJS");
/* generate XLSX file and send to client */
XLSX.writeFile(wb, "sheetjs.xlsx")
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};
render() { return (
<DragDropFile handleFile={this.handleFile}>
<div className="row"><div className="col-xs-12">
<DataInput handleFile={this.handleFile} />
</div></div>
<div className="row"><div className="col-xs-12">
<button disabled={!this.state.data.length} className="btn btn-success" onClick={this.exportFile}>Export</button>
</div></div>
<div className="row"><div className="col-xs-12">
<OutTable data={this.state.data} cols={this.state.cols} />
</div></div>
</DragDropFile>
); };
};
if(typeof module !== 'undefined') module.exports = SheetJSApp
/* -------------------------------------------------------------------------- */
/*
Simple HTML5 file drag-and-drop wrapper
usage: <DragDropFile handleFile={handleFile}>...</DragDropFile>
handleFile(file:File):void;
*/
class DragDropFile extends React.Component {
constructor(props) {
super(props);
this.onDrop = this.onDrop.bind(this);
};
suppress(evt) { evt.stopPropagation(); evt.preventDefault(); };
onDrop(evt) { evt.stopPropagation(); evt.preventDefault();
const files = evt.dataTransfer.files;
if(files && files[0]) this.props.handleFile(files[0]);
};
render() { return (
<div onDrop={this.onDrop} onDragEnter={this.suppress} onDragOver={this.suppress}>
{this.props.children}
</div>
); };
};
/*
Simple HTML5 file input wrapper
usage: <DataInput handleFile={callback} />
handleFile(file:File):void;
*/
class DataInput extends React.Component {
constructor(props) {
super(props);
this.handleChange = this.handleChange.bind(this);
};
handleChange(e) {
const files = e.target.files;
if(files && files[0]) this.props.handleFile(files[0]);
};
render() { return (
<form className="form-inline">
<div className="form-group">
<label htmlFor="file">Spreadsheet</label>
<input type="file" className="form-control" id="file" accept={SheetJSFT} onChange={this.handleChange} />
</div>
</form>
); };
}
/*
Simple HTML Table
usage: <OutTable data={data} cols={cols} />
data:Array<Array<any> >;
cols:Array<{name:string, key:number|string}>;
*/
class OutTable extends React.Component {
constructor(props) { super(props); };
render() { return (
<div className="table-responsive">
<table className="table table-striped">
<thead>
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<tr>{this.props.cols.map((c) => <th key={c.key}>{c.name}</th>)}</tr>
</thead>
<tbody>
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{this.props.data.map((r,i) => <tr key={i}>
{this.props.cols.map(c => <td key={c.key}>{ r[c.key] }</td>)}
</tr>)}
</tbody>
</table>
</div>
); };
};
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/* list of supported file types */
const SheetJSFT = [
"xlsx", "xlsb", "xlsm", "xls", "xml", "csv", "txt", "ods", "fods", "uos", "sylk", "dif", "dbf", "prn", "qpw", "123", "wb*", "wq*", "html", "htm"
].map(function(x) { return "." + x; }).join(",");
/* generate an array of column objects */
const make_cols = refstr => {
let o = [], C = XLSX.utils.decode_range(refstr).e.c + 1;
for(var i = 0; i < C; ++i) o[i] = {name:XLSX.utils.encode_col(i), key:i}
return o;
};