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---
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title: SvelteKit
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sidebar_label: SvelteKit
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description: Make static websites from spreadsheets using SvelteKit. Seamlessly integrate data into your website using SheetJS. Rapidly develop web apps powered by data in Excel.
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pagination_prev: demos/net/index
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pagination_next: demos/mobile/index
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---
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# Supercharge SvelteKit Apps with Spreadsheets
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import current from '/version.js';
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import CodeBlock from '@theme/CodeBlock';
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:::note
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[SvelteKit](https://kit.svelte.dev/) is a framework for generating static sites.
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It leverages modern technologies including ViteJS and SvelteJS[^1]
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This demo covers SvelteKit. The [Svelte demo](/docs/demos/frontend/svelte)
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covers general client-side strategies.
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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 ["Base64 Loader"](/docs/demos/static/vitejs#base64-loader)
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from the ViteJS demo.
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This demo uses SvelteKit and SheetJS to pull data from a spreadsheet and display
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the content in an HTML table. We'll explore how to use a plugin to pull raw data
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from files and how to organize page scripts to process the files at compile time.
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The ["Complete Example"](#complete-example) section includes a complete website
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powered by an XLSX spreadsheet.
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:::note pass
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The [Svelte demo](/docs/demos/frontend/svelte) covers general client-side usage.
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:::
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SvelteKit projects use ViteJS under the hood. They expose the `vite.config.js`
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script. The [ViteJS demo](/docs/demos/static/vitejs) examples work as expected!
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The following diagram depicts the workbook waltz:
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```mermaid
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@ -45,7 +55,11 @@ For static site generation, `@sveltejs/adapter-static` must be used.
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### Loader
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:::note
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SvelteKit projects use ViteJS under the hood. They expose the `vite.config.js`
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script. The "Base64 Loader" from the ViteJS demo[^2] can pull data from files
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into Base64 strings for processing in `+page.server.js` scripts.
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:::note pass
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The ViteJS demo used the query `?b64` to identify files. To play nice with
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SvelteKit, this demo matches the file extensions directly.
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@ -53,7 +67,7 @@ SvelteKit, this demo matches the file extensions directly.
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:::
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The loader should be added to `vite.config.js`. The code is nearly identical to
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the ["Base64 Loader" ViteJS example.](/docs/demos/static/vitejs#base64-loader)
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the "Base64 Loader" ViteJS example.
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```js title="vite.config.js"
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import { sveltekit } from '@sveltejs/kit/vite';
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@ -95,7 +109,8 @@ declare global {
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### Data Processing
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For static sites, SheetJS operations should be run in `+page.server.js` .
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For static sites, SheetJS operations should be run in `+page.server.js`[^3]. The
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script must include `export const prerender = true`[^4].
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Assuming `pres.xlsx` is stored in the `data` directory from the project root,
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the relative import
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@ -105,9 +120,12 @@ import b64 from "../../data/pres.xlsx"
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```
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will return a Base64 string which can be parsed in the script. The workbook
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object can be post-processed using utility functions. The following example
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uses `sheet_to_json` to generate arrays of row objects for each worksheet. The
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data presented to the page will be an object whose keys are worksheet names:
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object can be post-processed using utility functions.
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The following example uses the SheetJS `read` method[^5] to parse spreadsheet
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files and the `sheet_to_json` method[^6] to generate arrays of row objects for
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each worksheet. The data presented to the page will be an object whose keys are
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worksheet names:
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```js title="src/routes/+page.server.js"
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import b64 from "../../data/pres.xlsx";
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@ -157,7 +175,7 @@ a simple HTML table without any reference to the existing spreadsheet file!
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:::note
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This demo was tested on 2023 April 30 using SvelteKit `1.15.9`
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This demo was tested on 2023 July 12 using SvelteKit `1.22.2` and Svelte `4.0.5`
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:::
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@ -167,8 +185,6 @@ This demo was tested on 2023 April 30 using SvelteKit `1.15.9`
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```bash
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npm create svelte@latest sheetjs-svelte
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cd sheetjs-svelte
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npm i
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```
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When prompted:
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@ -177,7 +193,14 @@ When prompted:
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- `Add type checking with TypeScript?` select `Yes, using JavaScript with JSDoc`
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- `Select additional options` press Enter (do not select options)
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2) Fetch the example file [`pres.xlsx`](https://sheetjs.com/pres.xlsx) and move
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2) Enter the project folder and install dependencies:
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```bash
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cd sheetjs-svelte
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npm i
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```
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3) Fetch the example file [`pres.xlsx`](https://sheetjs.com/pres.xlsx) and move
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to a `data` subdirectory in the root of the project:
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```bash
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@ -185,29 +208,30 @@ mkdir -p data
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curl -Lo data/pres.xlsx https://sheetjs.com/pres.xlsx
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```
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3) Install the SheetJS library:
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4) Install the SheetJS library:
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<CodeBlock language="bash">{`\
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npm i --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz`}
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</CodeBlock>
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4) Replace the contents of `vite.config.js` with the contents of the code block
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5) Replace the contents of `vite.config.js` with the contents of the code block
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named [`vite.config.js` in the "Loader" section](#loader)
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5) Append the lines from [`src/app.d.ts` snippet in the "Types" section](#types)
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6) Append the lines from [`src/app.d.ts` snippet in the "Types" section](#types)
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to the `src/app.d.ts` file.
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6) Replace the contents of `src/routes/+page.server.ts` with the contents of the
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code block named [`src/routes/+page.server.ts` in "Data Processing"](#data-processing)
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7) Replace the contents of `src/routes/+page.server.ts` with the contents of the
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code block named [`src/routes/+page.server.ts` in "Data Processing"](#data-processing).
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If the file does not exist, create a new file.
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7) Replace the contents of `src/routes/+page.svelte` with the contents of the
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8) Replace the contents of `src/routes/+page.svelte` with the contents of the
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code block named [`src/routes/+page.svelte` in "Data Rendering"](#data-rendering)
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### Live Reload
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8) Open `data/pres.xlsx` in a spreadsheet editor like Apple Numbers or Excel.
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9) Open `data/pres.xlsx` in a spreadsheet editor like Apple Numbers or Excel.
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9) Start the development server:
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10) Start the development server:
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```bash
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npm run dev
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@ -216,29 +240,48 @@ npm run dev
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Open the displayed URL (typically `http://localhost:5173`) in a web browser and
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observe that the data from the spreadsheet is displayed in the page.
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10) In the spreadsheet, set cell A7 to `SheetJS Dev` and cell B7 to `47`. Save
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11) In the spreadsheet, set cell A7 to `SheetJS Dev` and cell B7 to `47`. Save
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the file. After saving, the browser should automatically refresh with new data.
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### Static Site
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11) Stop the development server and install the static adapter:
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12) Stop the development server and install the static adapter:
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```bash
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npm i --save @sveltejs/adapter-static
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```
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12) Edit `svelte.config.js` to use the new adapter:
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13) Edit `svelte.config.js` to use the new adapter:
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```diff title="svelte.config.js"
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-import adapter from '@sveltejs/adapter-auto';
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+import adapter from '@sveltejs/adapter-static';
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```
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13) Build the static site:
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14) Build the static site:
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```bash
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npm run build
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```
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14) Open a web browser and access the displayed URL (`http://localhost:8080`).
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View the page source and confirm that the raw HTML table includes the data.
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15) Start a local web server that will host the production build:
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```bash
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npx -y http-server build
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```
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16) Open a web browser and access the displayed URL (`http://localhost:8080`).
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View the page source and confirm that the raw HTML table includes the data.
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Searching for `Bill Clinton` should reveal the following row:
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```html
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<tr><td>Bill Clinton</td> <td>42</td> </tr>
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```
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[^1]: See ["SvelteKit vs Svelte"](https://kit.svelte.dev/docs/introduction#sveltekit-vs-svelte) in the SvelteKit documentation.
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[^2]: See ["Base64 Plugin" in the ViteJS demo](/docs/demos/static/vitejs#base64-plugin)
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[^3]: See ["Universal vs server"](https://kit.svelte.dev/docs/load#universal-vs-server) in the SvelteKit documentation.
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[^4]: See ["prerender"](https://kit.svelte.dev/docs/page-options#prerender) in the SvelteKit documentation.
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[^5]: See [`read` in "Reading Files"](/docs/api/parse-options)
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[^6]: See [`sheet_to_json` in "Utilities"](/docs/api/utilities/array#array-output)
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@ -7,6 +7,12 @@ sidebar_position: 2
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<details>
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<summary><b>File Format Support</b> (click to show)</summary>
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Traditional spreadsheet software, including Excel, support "Cell Links". The
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entire cell text is clickable.
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Modern spreadsheet software, including Numbers, support "Span Links". Links are
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applied to text fragments within the cell content. This mirrors HTML semantics.
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| Formats | Link | Tooltip | Link Type |
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|:------------------|:-----:|:-------:|:----------|
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| XLSX / XLSM | ✔ | ✔ | Cell Link |
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@ -29,14 +35,14 @@ Hyperlinks are stored in the `l` key of cell objects. The `Target` field of the
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hyperlink object is the target of the link, including the URI fragment. Tooltips
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are stored in the `Tooltip` field and are displayed when hovering over the text.
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For example, the following snippet creates a link from cell `A3` to
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For example, the following snippet creates a link from cell `A1` to
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<https://sheetjs.com> with the tip `"Find us @ SheetJS.com!"`:
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```js
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ws["A1"].l = { Target: "https://sheetjs.com", Tooltip: "Find us @ SheetJS.com!" };
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```
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:::note
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:::note pass
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Following traditional software, hyperlinks are applied to entire cell objects.
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Some formats (including HTML) attach links to text spans. The parsers apply the
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@ -44,7 +50,7 @@ first link to the entire cell. Writers apply links to the entire cell text.
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:::
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:::caution
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:::caution pass
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Excel does not automatically style hyperlinks. They will be displayed using
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the default cell style.
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@ -142,7 +148,7 @@ ws["B3"].l = { Target: "SheetJS.xlsb" }; /* Link to SheetJS.xlsb */
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ws["B4"].l = { Target: "../SheetJS.xlsm" }; /* Link to ../SheetJS.xlsm */
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```
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:::caution
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:::caution pass
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Relative Paths have undefined behavior in the SpreadsheetML 2003 format. Excel
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2019 will treat a `..\` parent mark as two levels up.
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@ -39,7 +39,7 @@ These instructions were tested on the following platforms:
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| Platform | Test Date |
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|:------------------------------|:-----------|
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| Linux (Steam Deck Holo 3.4.6) | 2023-04-04 |
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| Linux (Steam Deck Holo 3.4.8) | 2023-07-12 |
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| Linux (Ubuntu 18.04 aarch64) | 2023-04-13 |
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| MacOS 10.13 (x64) | 2023-04-04 |
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| MacOS 13.0 (arm64) | 2023-04-13 |
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