docs.sheetjs.com/05-neutralino.md at 04083d4d1e21706e4679549d8cc3b98c60ab096b

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NeutralinoJS

demos/mobile/index

demos/data/index

summary
Webview + Lightweight Extensions

import current from '/version.js'; import Tabs from '@theme/Tabs'; import TabItem from '@theme/TabItem'; import CodeBlock from '@theme/CodeBlock';

The Standalone build can be added to the entry index.html

The "Complete Example" creates an app that looks like the screenshot:

Win10	macOS	Linux

Integration Details

:::note

NeutralinoJS currently does not provide the equivalent of NodeJS fs module. The raw Neutralino.filesystem and Neutralino.os methods are used.

:::

The os and filesystem modules must be enabled in neutralino.conf.json. The starter already enables os so typically one line must be added:

  "nativeAllowList": [
    "app.*",
    "os.*",
// highlight-next-line
    "filesystem.*",
    "debug.log"
  ],

:::caution

At the time of writing, filters did not work as expected on MacOS. They have been omitted in the example and commented in the code snippets

:::

Reading Files

There are two steps to reading files: obtaining a path and reading binary data:

const filters = [
  {name: "Excel Binary Workbook", extensions: ["xlsb"]},
  {name: "Excel Workbook", extensions: ["xlsx"]},
]

async function openFile() {
  /* show open file dialog */
  const [filename] = await Neutralino.os.showOpenDialog(
    'Open a spreadsheet',
    { /* filters, */ multiSelections: false }
  );

  /* read data into an ArrayBuffer */
  const ab = await Neutralino.filesystem.readBinaryFile(filename);

  /* parse with SheetJS */
  const wb = XLSX.read(ab);
  return wb;
}

This method can be called from a button click or other event.

Writing Files

There are two steps to writing files: obtaining a path and writing binary data:

const filters = [
  {name: "Excel Binary Workbook", extensions: ["xlsb"]},
  {name: "Excel Workbook", extensions: ["xlsx"]},
]

async function saveFile(wb) {
  /* show save file dialog */
  const filename = await Neutralino.os.showSaveDialog(
    'Save to file',
    { /* filters */ }
  );

  /* Generate workbook */
  const bookType = filename.slice(filename.lastIndexOf(".") + 1);
  const data = XLSX.write(wb, { bookType, type: "buffer" });

  /* save data to file */
  await Neutralino.filesystem.writeBinaryFile(filename, data);
}

Complete Example

:::note

This demo was tested on 2023 March 19 with "binaries" 4.7.0 and "client" 3.6.0

:::

The app core state will be the HTML table. Reading files will add the table to the window. Writing files will parse the table into a spreadsheet.

Create a new NeutralinoJS app:

npx @neutralinojs/neu create sheetjs-neu
cd sheetjs-neu

Download Standalone build and place in resources/js/main.js:

{\ curl -L -o resources/js/xlsx.full.min.js https://cdn.sheetjs.com/xlsx-${current}/package/dist/xlsx.full.min.js}

Add the highlighted line to neutralino.conf.json in nativeAllowList:

  "nativeAllowList": [
    "app.*",
    "os.*",
// highlight-start
    "filesystem.*",
// highlight-end
    "debug.log"
  ],

Set up skeleton app and print version info:

Edit resources/index.html and replace the <body> with the code below:

  <body>
    <div id="neutralinoapp">
      <h1>SheetJS × NeutralinoJS</h1>
      <button onclick="importData()">Import Data</button>
      <button onclick="exportData()">Export Data</button>
      <div id="info"></div>
    </div>
    <script src="js/neutralino.js"></script>
    <!-- Load the browser build and make XLSX available to main.js -->
    <script src="js/xlsx.full.min.js"></script>
    <script src="js/main.js"></script>
  </body>

Append the following code to resources/styles.css to center the table:

#info {
    width:100%;
    text-align: unset;
}
table {
    margin: 0 auto;
}

Print the version number in the showInfo method of resources/js/main.js:

        ${NL_APPID} is running on port ${NL_PORT}  inside ${NL_OS}
        <br/><br/>
        <span>server: v${NL_VERSION} . client: v${NL_CVERSION}</span>
// highlight-start
        <br/><br/>
        <span>SheetJS version ${XLSX.version}</span>
// highlight-end
        `;

Run the app:

npx @neutralinojs/neu run

You should see SheetJS Version followed by the library version number.

Add the following code to the bottom of resources/js/main.js:

(async() => {
  const ab = await (await fetch("https://sheetjs.com/pres.numbers")).arrayBuffer();
  const wb = XLSX.read(ab);
  const ws = wb.Sheets[wb.SheetNames[0]];
  document.getElementById('info').innerHTML = XLSX.utils.sheet_to_html(ws);
})();

Save the source file, close the app and re-run the command from step 5.

When the app loads, a table should show in the main screen.

Add importFile and exportFile to the bottom of resources/js/main.js:

async function importData() {
  /* show open dialog */
  const [filename] = await Neutralino.os.showOpenDialog('Open a spreadsheet');

  /* read data */
  const ab = await Neutralino.filesystem.readBinaryFile(filename);
  const wb = XLSX.read(ab);

  /* make table */
  const ws = wb.Sheets[wb.SheetNames[0]];
  document.getElementById('info').innerHTML = XLSX.utils.sheet_to_html(ws);
}

async function exportData() {
    /* show save dialog */
  const filename = await Neutralino.os.showSaveDialog('Save to file');

  /* make workbook */
  const tbl = document.getElementById('info').querySelector("table");
  const wb = XLSX.utils.table_to_book(tbl);

  /* make file */
  const bookType = filename.slice(filename.lastIndexOf(".") + 1);
  const data = XLSX.write(wb, { bookType, type: "buffer" });
  await Neutralino.filesystem.writeBinaryFile(filename, data);
}

Save the source file, close the app and re-run the command from step 5.

When the app loads, click the "Import File" button and select a spreadsheet to see the contents. Click "Export File" and enter SheetJSNeu.xlsx to write.

Build production apps:

npx @neutralinojs/neu run

Platform-specific programs will be created in the dist folder.

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Integration Details

Reading Files

Writing Files

Complete Example

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