90 lines
2.5 KiB
Markdown
90 lines
2.5 KiB
Markdown
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# Chrome and Chromium
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This library is compatible with Chrome and Chromium extensions and should just
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work out of the box. Specific API support is listed in the Chrome extensions
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API documentation.
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## Generating Downloads
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The `writeFile` function works in a Chrome or Chromium extension:
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```js
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XLSX.writeFile(wb, "export.xlsx");
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```
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Under the hood, it uses the `chrome.downloads` API. `"downloads"` permission
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should be set in `manifest.json`:
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```js
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"permissions": [
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"downloads"
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]
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```
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## Content Script Table Scraping
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`table_to_book` and `table_to_sheet` can help build workbooks from DOM tables:
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```js
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var tables = document.getElementsByTagName("table");
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var wb = XLSX.utils.book_new();
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for(var i = 0; i < tables.length; ++i) {
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var ws = XLSX.utils.table_to_sheet(tables[i]);
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XLSX.utils.book_append_sheet(wb, ws, "Table" + i);
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}
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```
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## Demo
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The demo extension includes multiple features to demonstrate sample usage.
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Production extensions should include proper error handling.
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#### Table Exporter
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The `content.js` content script converts a table in the DOM to workbook object
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using the `table_to_book` utility function:
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```js
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// event page script trigger
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chrome.tabs.sendMessage(tab.id);
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// content script convert
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var wb = XLSX.utils.table_to_book(elt);
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// event page script callback
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XLSX.writeFile(wb, "export.xlsx");
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```
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Since the workbook object is a plain JS object, the object is sent back to an
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event page script which generates the file and attempts a download.
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#### Bookmark Exporter
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`chrome.bookmarks` API enables bookmark tree traversal. The "Export Bookmarks"
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button in the extension pop-up recursively walks the bookmark tree, pushes the
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bookmark URLs into a data array, and exports into a simple spreadsheet:
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```js
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/* walk the bookmark tree */
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function recurse_bookmarks(data, tree) {
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if(tree.url) data.push({Name: tree.title, Location: tree.url});
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(tree.children||[]).forEach(function(child) { recurse_bookmarks(data, child); });
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}
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/* get bookmark data */
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chrome.bookmarks.getTree(function(res) {
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/* load into an array */
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var data = [];
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res.forEach(function(t) { recurse_bookmarks(data, t); });
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/* create worksheet */
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var ws = XLSX.utils.json_to_sheet(data, { header: ['Name', 'Location'] });
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/* create workbook and export */
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var wb = XLSX.utils.book_new();
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XLSX.utils.book_append_sheet(wb, ws, 'Bookmarks');
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XLSX.writeFile(wb, "bookmarks.xlsx");
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});
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```
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[](https://github.com/SheetJS/js-xlsx)
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