worker
This commit is contained in:
parent
62cfee92ef
commit
e50dde6b20
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@ -35,8 +35,6 @@ The `@deno-types` comment instructs Deno to use the type definitions.
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Older releases are technically available on [deno.land/x](https://deno.land/x/)
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but the Deno registry is out of date.
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[This is a known registry bug](https://github.com/denoland/dotland/issues/2072)
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<https://cdn.sheetjs.com/> is the authoritative source for SheetJS scripts.
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:::
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@ -327,7 +327,7 @@ This example tries to separate the library-specific functions.
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0) **Follow the official React Native CLI Guide!**
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Development Environment Guide: <http://reactnative.dev/docs/environment-setup>
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Development Environment Guide: <https://reactnative.dev/docs/environment-setup>
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Follow the instructions for iOS and for Android. They will cover installation
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and system configuration. By the end, you should be able to run the sample app
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@ -676,7 +676,7 @@ on an iPhone SE 3rd generation.
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NativeScript will not safely transmit binary or UTF-8 strings. XLSB, NUMBERS,
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XLSX, XLS, ODS, SYLK, and DBF exports are known to be mangled.
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[This is a known NativeScript bug](https://github.com/NativeScript/NativeScript/issues/9586)
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This is a known NativeScript bug.
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This demo will focus on ASCII CSV files. Once the bug is resolved, XLSX and
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other formats will be supported.
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@ -142,7 +142,7 @@ This demo was tested against Electron 19.0.5 on an Intel Mac (`darwin-x64`).
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<details><summary><b>Complete Example</b> (click to show)</summary>
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This demo includes a drag-and-drop box as well as a file input box, mirroring
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the [SheetJS Data Preview Live Demo](http://oss.sheetjs.com/sheetjs/)
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the [SheetJS Data Preview Live Demo](https://oss.sheetjs.com/sheetjs/)
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The core data in this demo is an editable HTML table. The readers build up the
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table using `sheet_to_html` (with `editable:true` option) and the writers scrape
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@ -336,7 +336,7 @@ backwards compatibility multiple times. A summary of changes is noted below.
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Electron 6.x changed the `dialog` API. Methods like `showSaveDialog` originally
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returned an array of strings, but now returns a `Promise`. This change was not
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documented. [Electron issue](https://github.com/electron/electron/issues/24438)
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documented.
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Electron 9.0.0 and later require the preference `nodeIntegration: true` in order
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to `require('xlsx')` in the renderer process.
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@ -1381,7 +1381,7 @@ At the time of writing, the latest supported React Native version was `v0.64.3`
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NodeJS `v16` is required. There are OS-specific tools for downgrading:
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- [`nvm-windows`](https://github.com/coreybutler/nvm-windows/releases) Windows
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- [`nvm`](https://github.com/nvm-sh/nvm/) Linux, MacOS, WSL, etc.
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- [`n`](https://github.com/tj/n/) Linux, MacOS, WSL, etc.
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:::
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@ -275,9 +275,9 @@ export as XLSX.
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<Tabs>
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<TabItem value="nodejs" label="NodeJS">
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[The `better-sqlite3` module](https://www.npmjs.com/package/better-sqlite3)
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provides a very simple API for working with SQLite databases. `Statement#all`
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runs a prepared statement and returns an array of JS objects.
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The **`better-sqlite3`** module provides a very simple API for working with
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SQLite databases. `Statement#all` runs a prepared statement and returns an array
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of JS objects.
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1) Install the dependencies:
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@ -440,7 +440,7 @@ WebSQL was a popular SQL-based in-browser database available on Chrome. In
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practice, it is powered by SQLite, and most simple SQLite-compatible queries
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work as-is in WebSQL.
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The public demo <http://sheetjs.com/sql> generates a database from workbook.
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The public demo <https://sheetjs.com/sql> generates a database from workbook.
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Importing data from spreadsheets is straightforward using the `generate_sql`
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helper function from ["Building Schemas"](#building-schemas-from-worksheets):
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@ -783,7 +783,7 @@ MongoDB is a popular document-oriented database engine.
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It is straightforward to treat collections as worksheets. Each object maps to
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a row in the table.
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The official NodeJS connector is [`mongodb` on NPM](https://npm.im/mongodb).
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The official NodeJS connector is **`mongodb`**.
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Worksheets can be generated from collections by using `Collection#find`. A
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`projection` can suppress the object ID field:
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@ -0,0 +1,219 @@
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---
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title: Web Workers
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---
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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.
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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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:::
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## Installation
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In all cases, `importScripts` can load the [Standalone scripts](../getting-started/installation/standalone)
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```js
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importScripts("https://cdn.sheetjs.com/xlsx-latest/package/dist/xlsx.full.min.js");
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```
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For production use, it is highly encouraged to download and host the script.
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## Downloading a Remote File
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:::note
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`fetch` was enabled in Web Workers in Chrome 42 and Safari 10.3
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:::
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Typically the Web Worker performs the `fetch` operation, processes the workbook,
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and sends a final result to the main browser context for processing.
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In the following example, the script:
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- downloads <https://sheetjs.com/pres.numbers> in a Web Worker
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- loads the SheetJS library and parses the file in the Worker
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- generates an HTML string of the first table in the Worker
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- sends the string to the main browser context
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- adds the HTML to the page in the main browser context
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```jsx live
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function SheetJSFetchDLWorker() {
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const [html, setHTML] = React.useState("");
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return ( <>
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<button onClick={() => {
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/* this mantra embeds the worker source in the function */
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const worker = new Worker(URL.createObjectURL(new Blob([`\
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/* load standalone script from CDN */
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importScripts("https://cdn.sheetjs.com/xlsx-latest/package/dist/xlsx.full.min.js");
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/* this callback will run once the main context sends a message */
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self.addEventListener('message', async(e) => {
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try {
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/* Fetch file */
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const res = await fetch("https://sheetjs.com/pres.numbers");
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const ab = await res.arrayBuffer();
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/* Parse file */
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const wb = XLSX.read(ab);
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const ws = wb.Sheets[wb.SheetNames[0]];
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/* Generate HTML */
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const html = XLSX.utils.sheet_to_html(ws);
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/* Reply with result */
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postMessage({html: html});
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} catch(e) {
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/* Pass the error message back */
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postMessage({html: String(e.message || e).bold() });
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}
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}, false);
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`])));
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/* when the worker sends back the HTML, add it to the DOM */
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worker.onmessage = function(e) { setHTML(e.data.html); };
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/* post a message to the worker */
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worker.postMessage({});
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}}><b>Click to Start</b></button>
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<div dangerouslySetInnerHTML={{__html: html}}/>
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</> );
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}
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```
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## Creating a Local File
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:::caution `XLSX.writeFile`
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`XLSX.writeFile` will not work in Web Workers! Raw file data can be passed from
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the Web Worker to the main browser context for downloading.
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:::
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In the following example, the script:
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- generates a workbook object in the Web Worker
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- generates a XLSB file using `XLSX.write` in the Web Worker
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- sends the file (`Uint8Array`) to the main browser context
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- performs a download action in the main browser context
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```jsx live
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function SheetJSWriteFileWorker() {
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const [html, setHTML] = React.useState("");
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return ( <>
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<button onClick={() => { setHTML("");
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/* this mantra embeds the worker source in the function */
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const worker = new Worker(URL.createObjectURL(new Blob([`\
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/* load standalone script from CDN */
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importScripts("https://cdn.sheetjs.com/xlsx-latest/package/dist/xlsx.full.min.js");
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/* this callback will run once the main context sends a message */
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self.addEventListener('message', async(e) => {
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try {
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/* Create a new Workbook (in this case, from a CSV string) */
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const csv = \`\
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SheetJS,in,Web,Workers
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வணக்கம்,สวัสดี,你好,가지마
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1,2,3,4\`;
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const wb = XLSX.read(csv, { type: "string" });
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/* Write XLSB data */
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const u8 = XLSX.write(wb, { bookType: "xlsb", type: "buffer" });
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/* Reply with result */
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postMessage({data: u8});
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} catch(e) {
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/* Pass the error message back */
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postMessage({error: String(e.message || e).bold() });
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}
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}, false);
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`])));
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/* when the worker sends back the data, create a download */
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worker.onmessage = function(e) {
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if(e.data.error) return setHTML(e.data.error);
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/* this mantra is the standard HTML5 download attribute technique */
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const a = document.createElement("a");
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a.download = "SheetJSWriteFileWorker.xlsb";
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a.href = URL.createObjectURL(new Blob([e.data.data]));
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document.body.appendChild(a);
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a.click();
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document.body.removeChild(a);
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};
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/* post a message to the worker */
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worker.postMessage({});
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}}><b>Click to Start</b></button>
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<div dangerouslySetInnerHTML={{__html: html}}/>
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</> );
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}
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```
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## User-Submitted File
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:::note
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Typically `FileReader` is used in the main browser context. In Web Workers, the
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synchronous version `FileReaderSync` is more efficient.
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:::
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In the following example, the script:
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- waits for the user to drag-drop a file into a DIV
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- sends the `File` object to the Web Worker
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- loads the SheetJS library and parses the file in the Worker
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- generates an HTML string of the first table in the Worker
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- sends the string to the main browser context
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- adds the HTML to the page in the main browser context
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```jsx live
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function SheetJSDragDropWorker() {
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const [html, setHTML] = React.useState("");
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/* suppress default behavior for dragover and drop */
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function suppress(e) { e.stopPropagation(); e.preventDefault(); }
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return ( <>
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<div onDragOver={suppress} onDrop={(e) => {
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suppress(e);
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/* this mantra embeds the worker source in the function */
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const worker = new Worker(URL.createObjectURL(new Blob([`\
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/* load standalone script from CDN */
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importScripts("https://cdn.sheetjs.com/xlsx-latest/package/dist/xlsx.full.min.js");
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/* this callback will run once the main context sends a message */
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self.addEventListener('message', async(e) => {
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try {
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/* Read file data */
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const ab = new FileReaderSync().readAsArrayBuffer(e.data.file);
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/* Parse file */
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const wb = XLSX.read(ab);
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const ws = wb.Sheets[wb.SheetNames[0]];
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/* Generate HTML */
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const html = XLSX.utils.sheet_to_html(ws);
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/* Reply with result */
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postMessage({html: html});
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} catch(e) {
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/* Pass the error message back */
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postMessage({html: String(e.message || e).bold() });
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}
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}, false);
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`])));
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/* when the worker sends back the HTML, add it to the DOM */
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worker.onmessage = function(e) { setHTML(e.data.html); };
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/* post a message with the first File to the worker */
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worker.postMessage({ file: e.dataTransfer.files[0] });
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}}>Drag a file to this DIV to process!</div>
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<div dangerouslySetInnerHTML={{__html: html}}/>
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</> );
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}
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```
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@ -230,7 +230,7 @@ Google and the Angular team.
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The Angular tooling provides no easy way to switch between versions!
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[This is a known Angular problem](https://github.com/angular/angular-cli/issues/9047)
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This is a known Angular problem.
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To work around this, [`SheetJSAngular.zip`](pathname:///angular/SheetJSAngular.zip)
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is a skeleton project designed to play nice with each Angular version.
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@ -349,9 +349,8 @@ Parcel should play nice with SheetJS out of the box.
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:::warning Parcel Bug
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Errors of the form `Could not statically evaluate fs call` stem from a
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[parcel bug](https://github.com/parcel-bundler/parcel/pull/523). Upgrade to
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Parcel version 1.5.0 or later.
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Errors of the form `Could not statically evaluate fs call` stem from a Parcel
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bug. Upgrade to Parcel version 1.5.0 or later.
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:::
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@ -68,24 +68,6 @@ const u8 = XLSX.write(workbook, { type: "buffer", bookType: "xlsx" });
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const blob = new Blob([u8], { type: "application/vnd.ms-excel" });
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```
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## Web Workers
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:::warning
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**None of the browser methods work from Web Worker contexts!**
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Data operations with the Web APIs must happen in the browser main thread.
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:::
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Web Workers and main thread can transfer `ArrayBuffer` or `Uint8Array` objects.
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When generating a file, the worker will call `XLSX.write` with type `buffer`
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and transfer the result to the main thread to initiate a download.
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When parsing a file, the main thread will use the web API to read a `File` or
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`Blob`, extract the underlying `ArrayBuffer` and transfer to the Web Worker.
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## HTML5 Download Attribute
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_Writing Files_
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@ -176,7 +176,7 @@ import * as XLSX from 'https://cdn.sheetjs.com/xlsx-latest/package/xlsx.mjs';
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```
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The official registry endpoint <https://deno.land/x/sheetjs> is out of date.
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[This is a known registry bug](https://github.com/denoland/dotland/issues/2072)
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This is a known registry bug.
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:::
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@ -12,11 +12,12 @@ run in the web browser, demos will include interactive examples.
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- [`XMLHttpRequest and fetch`](./network)
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- [`Clipboard Data`](./clipboard)
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- [`Web Workers`](./worker)
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- [`Typed Arrays for Machine Learning`](./ml)
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- [`Local File Access`](./localfile)
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- [`LocalStorage and SessionStorage`](./database#localstorage-and-sessionstorage)
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- [`Web SQL Database`](./database#websql)
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- [`IndexedDB`](./database#indexeddb)
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- [`Local File Access`](./localfile)
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### Frameworks
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@ -36,6 +37,7 @@ run in the web browser, demos will include interactive examples.
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- [`vue3-table-lite`](./grid#vue3-table-lite)
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- [`angular-ui-grid`](./grid#angular-ui-grid)
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- [`material ui`](./grid#material-ui-table)
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### Platforms and Integrations
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- [`Command-Line Tools`](./cli)
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@ -301,7 +301,7 @@ The [`oldie` demo](../demos/legacy#internet-explorer) shows an IE-compatible fal
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<TabItem value="nodejs" label="NodeJS">
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`read` can accept a NodeJS buffer. `readFile` can read files generated by a
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HTTP POST request body parser like [`formidable`](https://npm.im/formidable):
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HTTP POST request body parser like **`formidable`**:
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```js
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const XLSX = require("xlsx");
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@ -444,7 +444,7 @@ const workbook = XLSX.read(data);
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For broader compatibility, third-party modules are recommended.
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[`request`](https://npm.im/request) requires a `null` encoding to yield Buffers:
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**`request`** requires a `null` encoding to yield Buffers:
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```js
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var XLSX = require("xlsx");
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@ -458,7 +458,7 @@ request({url: url, encoding: null}, function(err, resp, body) {
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});
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```
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[`axios`](https://axios-http.com/) works the same way in browser and in NodeJS:
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**`axios`** works the same way in browser and in NodeJS:
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```js
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const XLSX = require("xlsx");
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@ -861,7 +861,7 @@ chrome.runtime.onMessage.addListener(function(msg, sender, cb) {
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<summary><b>NodeJS HTML Tables without a browser</b> (click to show)</summary>
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NodeJS does not include a DOM implementation and Puppeteer requires a hefty
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Chromium build. [`jsdom`](https://npm.im/jsdom) is a lightweight alternative:
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Chromium build. **`jsdom`** is a lightweight alternative:
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```js
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const XLSX = require("xlsx");
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@ -10,9 +10,9 @@ title: API Reference
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`XLSX.version` is the version of the library (added by the build script).
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`XLSX.SSF` is an embedded version of the [format library](https://github.com/SheetJS/sheetjs/tree/master/packages/ssf).
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`XLSX.SSF` is an embedded version of the [format library](https://git.sheetjs.com/sheetjs/sheetjs/src/branch/master/packages/ssf).
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`XLSX.CFB` is an embedded version of the [container library](https://github.com/sheetjs/js-cfb).
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`XLSX.CFB` is an embedded version of the [container library](https://git.sheetjs.com/sheetjs/js-cfb).
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|
||||
## Parsing functions
|
||||
|
||||
|
|
|
|||
|
|
@ -6,7 +6,14 @@ hide_table_of_contents: true
|
|||
|
||||
The official source code repository is <https://git.sheetjs.com/sheetjs/sheetjs>
|
||||
|
||||
Mirrors:
|
||||
:::note Mirrors
|
||||
|
||||
Older snapshots of the source code repository are available at various hosts:
|
||||
|
||||
- [GitHub](https://github.com/sheetjs/sheetjs)
|
||||
- [GitLab](https://gitlab.com/sheetjs/sheetjs)
|
||||
- [BitBucket](https://bitbucket.org/sheetjs/sheetjs)
|
||||
|
||||
<https://git.sheetjs.com/sheetjs/sheetjs> is the authoritative repository.
|
||||
|
||||
:::
|
||||
|
|
@ -5,7 +5,7 @@ sidebar_position: 5
|
|||
# Contributing
|
||||
|
||||
Due to the precarious nature of the Open Specifications Promise, it is very
|
||||
important to ensure code is cleanroom. [Contribution Notes](https://raw.githubusercontent.com/SheetJS/sheetjs/master/CONTRIBUTING.md)
|
||||
important to ensure code is cleanroom. [Contribution Notes](https://git.sheetjs.com/sheetjs/sheetjs/src/branch/master/CONTRIBUTING.md)
|
||||
|
||||
<details>
|
||||
<summary><b>File organization</b> (click to show)</summary>
|
||||
|
|
|
|||
|
|
@ -0,0 +1,23 @@
|
|||
<body>
|
||||
<style>TABLE { border-collapse: collapse; } TD { border: 1px solid; }</style>
|
||||
<div id="tavolo"></div>
|
||||
<script src="https://cdn.sheetjs.com/xlsx-latest/package/dist/xlsx.full.min.js"></script>
|
||||
<script type="text/javascript">
|
||||
(async() => {
|
||||
/* fetch and parse workbook -- see the fetch example for details */
|
||||
const workbook = XLSX.read(await (await fetch("https://sheetjs.com/pres.numbers")).arrayBuffer());
|
||||
|
||||
let output = [];
|
||||
/* loop through the worksheet names in order */
|
||||
workbook.SheetNames.forEach(name => {
|
||||
/* generate HTML from the corresponding worksheets */
|
||||
const worksheet = workbook.Sheets[name];
|
||||
const html = XLSX.utils.sheet_to_html(worksheet);
|
||||
/* add a header with the title name followed by the table */
|
||||
output.push(`<H3>${name}</H3>${html}`);
|
||||
});
|
||||
/* write to the DOM at the end */
|
||||
tavolo.innerHTML = output.join("\n");
|
||||
})();
|
||||
</script>
|
||||
</body>
|
||||
|
|
@ -0,0 +1,38 @@
|
|||
<!DOCTYPE html>
|
||||
<!-- sheetjs (C) 2013-present SheetJS http://sheetjs.com -->
|
||||
<!-- vim: set ts=2: -->
|
||||
<html lang="en" style="height: 100%">
|
||||
<body>
|
||||
<style>TABLE { border-collapse: collapse; } TD { border: 1px solid; }</style>
|
||||
<script src="https://unpkg.com/react@17/umd/react.development.js"></script>
|
||||
<script src="https://unpkg.com/react-dom@17/umd/react-dom.development.js"></script>
|
||||
<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
|
||||
<script src="https://cdn.sheetjs.com/xlsx-latest/package/dist/xlsx.full.min.js"></script>
|
||||
<div id="root"></div>
|
||||
|
||||
<script type="text/babel">
|
||||
function Titel(props) { return ( <h3>{props.name}</h3> ); }
|
||||
|
||||
function Tabeller(props) {
|
||||
/* the workbook object is the state */
|
||||
const [workbook, setWorkbook] = React.useState(XLSX.utils.book_new());
|
||||
|
||||
React.useEffect(() => { (async() => {
|
||||
/* fetch and parse workbook -- see the fetch example for details */
|
||||
const wb = XLSX.read(await (await fetch("https://sheetjs.com/pres.numbers")).arrayBuffer());
|
||||
setWorkbook(wb);
|
||||
})(); });
|
||||
|
||||
return workbook.SheetNames.map((name, idx) => ( <div key={idx}>
|
||||
<Titel name={name} />
|
||||
<div dangerouslySetInnerHTML={{
|
||||
/* this __html mantra is needed to set the inner HTML */
|
||||
__html: XLSX.utils.sheet_to_html(workbook.Sheets[name])
|
||||
}} />
|
||||
</div>));
|
||||
}
|
||||
|
||||
ReactDOM.render( <Tabeller/> , root );
|
||||
</script>
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -0,0 +1,43 @@
|
|||
<!DOCTYPE html>
|
||||
<!-- sheetjs (C) 2013-present SheetJS http://sheetjs.com -->
|
||||
<!-- vim: set ts=2: -->
|
||||
<html lang="en" style="height: 100%">
|
||||
<body>
|
||||
<style>TABLE { border-collapse: collapse; } TD { border: 1px solid; }</style>
|
||||
<script type="importmap">{
|
||||
"imports": {
|
||||
"vue": "https://unpkg.com/vue@3/dist/vue.esm-browser.js",
|
||||
"xlsx": "https://cdn.sheetjs.com/xlsx-latest/package/xlsx.mjs"
|
||||
}
|
||||
}</script>
|
||||
<div id="root"></div>
|
||||
|
||||
<script type="module">
|
||||
import { createApp, reactive } from 'vue';
|
||||
import { read, utils } from 'xlsx';
|
||||
|
||||
const S5SComponent = {
|
||||
mounted() { (async() => {
|
||||
/* fetch and parse workbook -- see the fetch example for details */
|
||||
const workbook = read(await (await fetch("https://sheetjs.com/pres.numbers")).arrayBuffer());
|
||||
/* loop through the worksheet names in order */
|
||||
workbook.SheetNames.forEach(name => {
|
||||
/* generate HTML from the corresponding worksheets */
|
||||
const html = utils.sheet_to_html(workbook.Sheets[name]);
|
||||
/* add to state */
|
||||
this.wb.wb.push({ name, html });
|
||||
});
|
||||
})(); },
|
||||
/* this state mantra is required for array updates to work */
|
||||
setup() { return { wb: reactive({ wb: [] }) }; },
|
||||
template: `
|
||||
<div v-for="ws in wb.wb" :key="ws.name">
|
||||
<h3>{{ ws.name }}</h3>
|
||||
<div v-html="ws.html"></div>
|
||||
</div>`
|
||||
};
|
||||
|
||||
createApp(S5SComponent).mount('#root');
|
||||
</script>
|
||||
</body>
|
||||
</html>
|
||||
Loading…
Reference in New Issue