content-type
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/*.ts
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Content-Type: text/javascript
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Content-Type: application/typescript
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@ -16,10 +16,27 @@ 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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:::note
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Each browser demo was tested in the following environments:
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| Browser | Date |
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|:------------|:-----------|
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| Chrome 116 | 2023-09-01 |
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| Safari 16.6 | 2023-09-01 |
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| Brave 1.57 | 2023-09-01 |
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:::
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## Browser Reading (paste)
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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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Clipboard data can be read from a `paste` event.
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The event `clipboardData` property has a `getData` method which returns a string
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compatible with the `"string"` type in the SheetJS `read` method[^1].
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The following example reads from the HTML clipboard and generates a XLSX file
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using the SheetJS `writeFile` method[^2]:
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```js
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document.onpaste = function(e) {
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@ -31,7 +48,7 @@ document.onpaste = function(e) {
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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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`getData` accepts one argument: the desired MIME type. Tested browsers support:
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| MIME type | Data format |
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|:-------------|:---------------------------|
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@ -39,8 +56,6 @@ document.onpaste = function(e) {
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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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@ -78,10 +93,10 @@ function ClipboardRead() {
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Modern browsers support reading files that users have copied into the clipboard.
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:::caution
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:::caution pass
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Excel does not copy data into files! Use your system file browser to select and
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copy spreadsheets into the clipboard.
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Due to browser API limitations, the system file browser should be used to select
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and copy spreadsheets into the clipboard.
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:::
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@ -121,11 +136,15 @@ function ClipboardReadFiles() {
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}
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```
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## Browser Writing (copy)
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Clipboard data can be written from a `copy` event, accessible from the event
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`clipboardData` property:
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Clipboard data can be written from a `copy` event.
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The event `clipboardData` property has a `setData` method which accepts a string
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that can be generated using `type: "string"` in the SheetJS `write` method[^3].
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The following example generates a HTML string from the first sheet of a workbook
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object and loads the string into the HTML clipboard:
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```js
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document.oncopy = function(e) {
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@ -139,12 +158,15 @@ document.oncopy = function(e) {
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};
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```
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`setData` accepts two arguments: MIME type and new data. Chrome 103 supports:
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`setData` accepts two arguments: MIME type and new data.
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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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The following table lists the supported MIME types and the `bookType`[^4] value
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that must be passed to the SheetJS `write` method:
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| MIME type | Data format | `bookType` |
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|:-------------|:---------------------------|:-----------|
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| `text/plain` | TSV (tab separated values) | `txt` |
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| `text/html` | HTML | `html` |
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Browsers do not currently support assigning to the `text/rtf` clipboard type.
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@ -160,7 +182,7 @@ This demo creates a simple workbook from the following HTML table:
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Create a new file in Excel then come back to this window. Select the text
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below and copy (Control+C for Windows, Command+C for Mac). Go back to the
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excel
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Excel file, select cell A1, and paste.
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```jsx live
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function ClipboardWrite() {
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@ -190,9 +212,9 @@ There are special methods for specific clipboard types:
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| File Type | Read Clipboard Data | Write Clipboard Data |
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|:----------|:---------------------|:----------------------|
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| RTF | `clipboard.readRTF` | `clipboard.writeRTF` |
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| TSV | `clipboard.readText` | `clipboard.writeText` |
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| HTML | `clipboard.readHTML` | `clipboard.writeHTML` |
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| RTF | `clipboard.readRTF` | `clipboard.writeRTF` |
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Each method operates on JS strings.
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@ -211,23 +233,7 @@ function copy_first_sheet_to_clipboard(workbook) {
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}
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```
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:::caution Experimental Buffer Clipboard Support
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Electron additionally supports binary operations using `Buffer` objects. This
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support is considered "experimental" and is not guaranteed to work on any
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platform. Issues should be raised with the Electron project
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On the `MacOS` platform, some versions of Excel store a packaged file with key
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`dyn.ah62d4qmxhk4d425try1g44pdsm11g55gsu1en5pcqzwc4y5tsz3gg3k`. The package is
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a simple CFB file that can be parsed:
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```js
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const { clipboard } = require('electron');
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const XLSX = require("xlsx");
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const buf = clipboard.readBuffer('dyn.ah62d4qmxhk4d425try1g44pdsm11g55gsu1en5pcqzwc4y5tsz3gg3k');
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const cfb = XLSX.CFB.read(buf, {type: "buffer"});
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const pkg = XLSX.CFB.find(cfb, "Package").content;
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const wb = XLSX.read(pkg);
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```
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:::
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[^1]: See [`read` in "Reading Files"](/docs/api/parse-options)
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[^2]: See [`writeFile` in "Writing Files"](/docs/api/write-options)
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[^3]: See [`write` in "Writing Files"](/docs/api/write-options)
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[^4]: See ["Supported Output Formats" in "Writing Files"](/docs/api/write-options#supported-output-formats) for details on `bookType`
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@ -143,16 +143,16 @@ This demo was last tested in the following deployments:
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| Node Version | Date | Node Status when tested |
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|:-------------|:-----------|:------------------------|
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| `0.12.18` | 2023-05-30 | End-of-Life |
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| `4.9.1` | 2023-05-30 | End-of-Life |
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| `6.17.1` | 2023-05-30 | End-of-Life |
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| `8.17.0` | 2023-05-30 | End-of-Life |
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| `10.24.1` | 2023-05-30 | End-of-Life |
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| `12.22.12` | 2023-05-30 | End-of-Life |
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| `14.21.3` | 2023-05-30 | End-of-Life |
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| `16.20.0` | 2023-05-30 | Maintenance LTS |
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| `18.16.0` | 2023-05-30 | Active LTS |
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| `20.2.0` | 2023-05-30 | Current |
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| `0.12.18` | 2023-09-02 | End-of-Life |
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| `4.9.1` | 2023-09-02 | End-of-Life |
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| `6.17.1` | 2023-09-02 | End-of-Life |
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| `8.17.0` | 2023-09-02 | End-of-Life |
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| `10.24.1` | 2023-09-02 | End-of-Life |
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| `12.22.12` | 2023-09-02 | End-of-Life |
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| `14.21.3` | 2023-09-02 | End-of-Life |
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| `16.20.0` | 2023-09-02 | Maintenance LTS |
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| `18.17.1` | 2023-09-02 | Active LTS |
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| `20.5.1` | 2023-09-02 | Current |
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While streaming methods work in End-of-Life versions of NodeJS, production
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deployments should upgrade to a Current or LTS version of NodeJS.
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@ -212,7 +212,7 @@ Joseph Biden,46
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:::note
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The live demo was last tested on 2023 May 30 in Chromium 113.
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The live demo was last tested on 2023-09-02 in Chromium 116.
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:::
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@ -313,7 +313,7 @@ The following live demo fetches and parses a file in a Web Worker. The `to_csv`
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streaming function is used to generate CSV rows and pass back to the main thread
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for further processing.
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:::note
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:::note pass
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For Chromium browsers, the File System Access API provides a modern worker-only
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approach. [The Web Workers demo](/docs/demos/bigdata/worker#streaming-write)
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@ -443,7 +443,7 @@ stream.to_csv(wb.Sheets[wb.SheetNames[0]]).resume();`}
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:::note
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This demo was last tested on 2023 May 30
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This demo was last tested on 2023-09-02 against Deno `1.36.4`
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:::
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@ -13,7 +13,7 @@ Parsing and writing large spreadsheets takes time. During the process, if the
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SheetJS library is running in the web browser, the website may freeze.
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Workers provide a way to off-load the hard work so that the website does not
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freeze during processing. The work is still performed locally. No data is sent
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freeze during processing. The work is still performed locally. No data is sent
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to a remote server.
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The following diagrams show the normal and Web Worker flows when exporting a
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@ -71,7 +71,7 @@ sequenceDiagram
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:::note Browser Compatibility
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IE10+ and modern browsers support basic Web Workers. Some APIs like `fetch` were
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added later. Feature testing is highly recommended.
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added later. Feature testing is strongly recommended.
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:::
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@ -138,7 +138,7 @@ For production use, it is highly encouraged to download and host the script.
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ESM is supported in Web Workers in the Chromium family of browsers (including
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Chrome and Edge) as well as in browsers powered by WebKit (including Safari).
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For legacy browsers like Firefox and IE, `importScripts` should be used.
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For legacy browsers including Firefox and IE, `importScripts` should be used.
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:::
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@ -189,10 +189,10 @@ Each browser demo was tested in the following environments:
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| Browser | Date | Comments |
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|:------------|:-----------|:----------------------------------------|
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| Chrome 113 | 2023-05-22 | |
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| Edge 113 | 2023-05-22 | |
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| Safari 16.4 | 2023-05-22 | File System Access API is not supported |
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| Brave 1.51 | 2023-05-22 | File System Access API is not supported |
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| Chrome 116 | 2023-09-02 | |
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| Edge 116 | 2023-09-02 | |
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| Safari 16.6 | 2023-09-02 | File System Access API is not supported |
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| Brave 1.57 | 2023-09-02 | File System Access API is not supported |
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| Firefox 113 | 2023-05-22 | File System Access API is not supported |
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:::
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} else if(e.data.time) log(e.data.time, e.data.ts);
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};
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setCnt(0); setHz(0); setState(""); setHTML("");
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try {
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if(!window.showSaveFilePicker) setState("Browser missing API support!");
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else try {
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/* Show picker and get handle to file */
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const wFile = await window.showSaveFilePicker({
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suggestedName: "SheetJSStream.csv",
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This demo covers conversions between worksheets and Typed Arrays for use with
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TensorFlow.js and other ML libraries.
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:::note
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:::info pass
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Live code blocks in this page load the standalone build from version `4.6.0`.
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Live code blocks in this page load the standalone build from version `4.10.0`.
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For use in web frameworks, the `@tensorflow/tfjs` module should be used.
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:::
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:::note pass
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Each browser demo was tested in the following environments:
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| Browser | Date | TF.js version |
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|:------------|:-----------|:--------------|
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| Chrome 116 | 2023-09-02 | `4.10.0` |
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| Safari 16.6 | 2023-09-02 | `4.10.0` |
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| Brave 1.57 | 2023-09-02 | `4.10.0` |
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:::
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## CSV Data Interchange
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`tf.data.csv` generates a Dataset from CSV data. The function expects a URL.
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generated and fed to `tf.data.csv`. The rest of the demo follows the official
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example in the TensorFlow documentation.
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:::caution
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:::caution pass
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If the live demo shows a message
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@ -181,7 +193,7 @@ async function getData() {
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## Low-Level Operations
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:::caution
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:::caution pass
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While it is more efficient to use low-level operations, JS or CSV interchange
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is strongly recommended when possible.
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@ -191,7 +203,7 @@ is strongly recommended when possible.
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### Data Transposition
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A typical dataset in a spreadsheet will start with one header row and represent
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each data record in its own row. For example, the Iris dataset might look like
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each data record in its own row. For example, the Iris dataset might look like
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### Importing Data from a Spreadsheet
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`sheet_to_json` with the option `header:1` will generate a row-major array of
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arrays that can be transposed. However, it is more efficient to walk the sheet
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arrays that can be transposed. However, it is more efficient to walk the sheet
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manually:
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```js
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{
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"label": "Big Data",
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"position": 11
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"position": 37
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}
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@ -13,7 +13,7 @@ data processing in the web browser, and some innovations and discoveries have
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been integrated into the ReactJS framework and other foundational JS libraries.
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JS Engines have improved over the years, but there are some hard limits to
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browser support using traditional methods of data processing. Vendors have
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browser support using traditional methods of data processing. Vendors have
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introduced APIs and techniques for representing and processing very large binary
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and textual files.
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{
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"label": "Other Languages",
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"position": 12
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"position": 42
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}
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