226 lines
5.7 KiB
Markdown
226 lines
5.7 KiB
Markdown
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---
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title: Bundling Sheets with RequireJS
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sidebar_label: RequireJS
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pagination_prev: demos/index
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pagination_next: demos/grid/index
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sidebar_position: 11
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---
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import current from '/version.js';
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import Tabs from '@theme/Tabs';
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import TabItem from '@theme/TabItem';
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import CodeBlock from '@theme/CodeBlock';
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[RequireJS](https://requirejs.org/) is a JavaScript file and module loader. It
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includes an in-browser loader as well as a static optimizer.
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[SheetJS](https://sheetjs.com) is a JavaScript library for reading and writing
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data from spreadsheets.
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This demo uses RequireJS and SheetJS to export data. We'll explore how to load
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SheetJS in a site using RequireJS and how to use the `r.js` optimizer to create
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a bundled site.
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The [Live demo](pathname:///requirejs/requirejs.html) loads RequireJS from the
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CDN, uses it to load the standalone script from the SheetJS CDN, and uses the
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`XLSX` variable to create a button click handler that creates a workbook.
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:::note
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This demo was last tested on 2023 October 18 against RequireJS `2.3.6`
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:::
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## Integration Details
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The [SheetJS Standalone scripts](/docs/getting-started/installation/standalone)
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comply with AMD `define` semantics. They support RequireJS and the `r.js`
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optimizer out of the box.
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### Config
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The RequireJS config should set the `xlsx` alias in the `paths` property.
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#### SheetJS CDN
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The SheetJS CDN URL can be directly referenced in a path alias:
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<CodeBlock language="js">{`\
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require.config({
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baseUrl: ".",
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name: "app",
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paths: {
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// highlight-next-line
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xlsx: "https://cdn.sheetjs.com/xlsx-${current}/package/dist/xlsx.full.min"
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}
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});`}
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</CodeBlock>
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#### Vendoring
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After downloading the SheetJS standalone script, a relative path can be used in
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the path alias. For example, if the standalone script was downloaded in the same
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directory as the HTML page, the path should be `./xlsx.full.min`:
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```js
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require.config({
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baseUrl: ".",
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name: "app",
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paths: {
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// highlight-next-line
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xlsx: "./xlsx.full.min"
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}
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});
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```
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### Usage
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Once the alias is set, `"xlsx"` can be required from app scripts:
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```js
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// highlight-next-line
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require(["xlsx"], function(XLSX) {
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/* use XLSX here */
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console.log(XLSX.version);
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});
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```
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Within the callback, the `XLSX` variable exposes the functions listed in the
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["API Reference"](/docs/api/) section of the documentation.
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## Complete Example
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This demo will explore the standalone RequireJS script and the `r.js` optimizer.
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### Standalone RequireJS
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0) Download the SheetJS Standalone script and move to the project directory:
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<ul>
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<li><a href={`https://cdn.sheetjs.com/xlsx-${current}/package/dist/xlsx.full.min.js`}>xlsx.full.min.js</a></li>
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</ul>
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<CodeBlock language="bash">{`\
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curl -LO https://cdn.sheetjs.com/xlsx-${current}/package/dist/xlsx.full.min.js`}
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</CodeBlock>
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1) Save the following to `index.html`:
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```html title="index.html"
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<!DOCTYPE html>
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<html lang="en">
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<head></head>
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<body>
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<h1>SheetJS Presidents Demo</h1>
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<button id="xport">Click here to export</button>
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<script src="http://requirejs.org/docs/release/2.3.6/comments/require.js"></script>
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<script>
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/* Wire up RequireJS */
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require.config({
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baseUrl: ".",
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name: "SheetJSRequire",
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paths: {
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xlsx: "./xlsx.full.min"
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}
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});
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</script>
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<script src="SheetJSRequire.js"></script>
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</body>
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</html>
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```
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2) Save the following to `SheetJSRequire.js`:
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```js title="SheetJSRequire.js"
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require(["xlsx"], function(XLSX) {
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document.getElementById("xport").addEventListener("click", function() {
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/* fetch JSON data and parse */
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var url = "https://sheetjs.com/data/executive.json";
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fetch(url).then(function(res) { return res.json(); }).then(function(raw_data) {
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/* filter for the Presidents */
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var prez = raw_data.filter(function(row) { return row.terms.some(function(term) { return term.type === "prez"; }); });
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/* flatten objects */
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var rows = prez.map(function(row) { return {
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name: row.name.first + " " + row.name.last,
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birthday: row.bio.birthday
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}; });
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/* generate worksheet and workbook */
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var worksheet = XLSX.utils.json_to_sheet(rows);
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var workbook = XLSX.utils.book_new();
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XLSX.utils.book_append_sheet(workbook, worksheet, "Dates");
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/* fix headers */
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XLSX.utils.sheet_add_aoa(worksheet, [["Name", "Birthday"]], { origin: "A1" });
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/* calculate column width */
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var max_width = rows.reduce(function(w, r) { return Math.max(w, r.name.length); }, 10);
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worksheet["!cols"] = [ { wch: max_width } ];
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/* create an XLSX file and try to save to Presidents.xlsx */
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XLSX.writeFileXLSX(workbook, "Presidents.xlsx");
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});
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});
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});
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```
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:::info pass
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The `r.js` optimizer does not handle `async` functions or ES6 arrow functions.
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To demonstrate compatibility with older versions of Webpack, `SheetJSRequire.js`
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uses normal functions and traditional Promise chains.
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:::
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3) Start a local HTTP server, then go to `http://localhost:8080/`
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```bash
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npx http-server .
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```
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Click on "Click here to export" to generate a file.
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### r.js Optimizer
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4) Create `build.js` configuration for the optimizer:
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```js title="build.js"
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({
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baseUrl: ".",
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name: "SheetJSRequire",
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paths: {
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xlsx: "./xlsx.full.min"
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},
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out: "SheetJSRequire.min.js"
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});
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```
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5) Run the `r.js` optimizer to create `SheetJSRequire.min.js`:
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```bash
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npx -p requirejs@2.3.6 r.js -o build.js
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```
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6) Save the following to `optimized.html`:
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```html title="optimized.html"
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<!DOCTYPE html>
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<html lang="en">
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<head></head>
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<body>
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<h1>SheetJS Presidents Demo</h1>
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<button id="xport">Click here to export</button>
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<script src="http://requirejs.org/docs/release/2.3.3/comments/require.js"></script>
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<script src="SheetJSRequire.min.js"></script>
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</body>
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</html>
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```
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7) Open `http://localhost:8080/optimized.html`
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Click on "Click here to export" to generate a file.
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