78 lines
2.7 KiB
Markdown
78 lines
2.7 KiB
Markdown
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---
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sidebar_position: 6
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---
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# Clipboard Data
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Spreadsheet software like Excel typically support copying and pasting cells and
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data. This is implemented through the Clipboard ("Pasteboard" in OSX parlance).
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When copying a selection of cells, Excel for Windows stores a screenshot of the
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selected cells as an image. It also creates and stores a number of strings and
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files for the various formats, including TSV, CSV, HTML, RTF, SYLK, DIF, XLSB,
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XLS (both '97-2004 and '95), and SpreadsheetML 2003.
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Not all Clipboard APIs offer access to all clipboard types.
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## Browser
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Clipboard data can be read from a `paste` event, accessible from the event
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`clipboardData` property:
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```js
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document.onpaste = function(e) {
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/* get TSV */
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var str = e.clipboardData.getData('text/html');
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/* parse */
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var wb = XLSX.read(str, {type: "string"});
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/* DO SOMETHING WITH wb HERE */
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}
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```
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`getData` accepts one argument: the desired MIME type. Chrome 103 supports:
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| MIME type | Data format |
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|:-------------|:---------------------------|
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| `text/plain` | TSV (tab separated values) |
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| `text/html` | HTML |
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| `text/rtf` | RTF (rich text format) |
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`getData` returns a string compatible with the `string` type for `XLSX.read`.
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### Live Demo
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Open a file in Excel, copy some cells, then come back to this window. Click on
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"RESULT" below and paste (Control+V for Windows, Command+V for Mac).
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```jsx live
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function Clipboard() {
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const [csvs, setCSVs] = React.useState([ "", "", "" ]);
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/* Set up paste handler */
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React.useEffect(async() => {
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document.onpaste = function(e) {
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/* this demo will read 3 different clipboard data types */
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var mime_arr = [ 'text/plain', 'text/html', 'text/rtf' ];
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/* get clipboard data for each type */
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var data_arr = mime_arr.map(mime => e.clipboardData.getData(mime));
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/* parse each data string into a workbook */
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var wb_arr = data_arr.map(str => XLSX.read(str, {type: "string"}));
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/* get first worksheet from each workbook */
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var ws_arr = wb_arr.map(wb => wb.Sheets[wb.SheetNames[0]]);
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/* generate CSV for each "first worksheet" */
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var result = ws_arr.map(ws => XLSX.utils.sheet_to_csv(ws));
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setCSVs(result);
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}
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}, []);
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return (
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<>
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{csvs[0] && (<pre><b>Data from clipboard TSV (text/plain)</b><br/>{csvs[0]}</pre>)}
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{csvs[1] && (<pre><b>Data from clipboard HTML (text/html)</b><br/>{csvs[1]}</pre>)}
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{csvs[2] && (<pre><b>Data from clipboard RTF (text/rtf)</b><br/>{csvs[2]}</pre>)}
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{csvs.every(x => !x) && <b>Copy data in Excel, click here, and paste (Control+V)</b>}
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</>
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)
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}
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```
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