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Data in Quasar Apps

Quasar

Build data-intensive mobile apps with Quasar and Cordova. Seamlessly integrate spreadsheets into your app using SheetJS. Let data in your Excel spreadsheets shine.

demos/static/index

demos/desktop/index

summary
VueJS + Web View

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

Quasar is a VueJS framework for building iOS and Android apps with the Cordova platform.

SheetJS is a JavaScript library for reading and writing data from spreadsheets.

This demo uses Quasar and SheetJS to process data and generate spreadsheets. We'll explore how to load SheetJS in an Quasar app and use Quasar and Cordova features to extract data from, and write data to, spreadsheets on the device.

The "Demo" creates an app that looks like the screenshots below:

iOS	Android

:::note Tested Deployments

This demo was tested in the following environments:

Simulators

OS	Device	Quasar	Dev Platform	Date
Android 34	Pixel 3a	`2.14.1`	`darwin-x64`	2023-12-04
iOS 17.0.1	iPhone SE (3rd gen)	`2.14.1`	`darwin-x64`	2023-12-04

:::

Integration Details

The SheetJS NodeJS Module can be imported from any component or script in the app.

This demo will use the Quasar ViteJS starter project with VueJS and Cordova. The starter places the backing Cordova project in the src-cordova folder.

The complete solution uses cordova-plugin-file for file operations. It can be installed from the Cordova folder:

cd src-cordova
cordova plugin add cordova-plugin-file
cd ..

Reading data

The QFile¹ component presents an API reminiscent of File Input elements:

<q-file label="Load File" filled label-color="orange" @input="updateFile"/>

When binding to the input element, the callback receives an Event object. Using standard DOM operations, the file data can be pulled into an ArrayBuffer and parsed using the SheetJS read method². read returns a workbook³ object that holds data and metadata for each worksheet.

This snippet reads a workbook, pulls the first worksheet, generates an array of objects using the SheetJS sheet_to_json⁴ method, and updates state:

import { read } from 'xlsx';

// assuming `todos` is a standard VueJS `ref`
async function updateFile(v) { try {
  // `v.target.files[0]` is the desired file object
  const files = (v.target as HTMLInputElement).files;
  if(!files || files.length == 0) return;

  // read first file
  const wb = read(await files[0].arrayBuffer());

  // get data of first worksheet as an array of objects
  const data = utils.sheet_to_json(wb.Sheets[wb.SheetNames[0]]);

  // update state
  todos.value = data.map(row => ({id: row.Index, content: row.Name}));

} catch(e) { console.log(e); } }

Writing data

Starting from an array of objects, the SheetJS json_to_sheet method⁵ generates a SheetJS worksheet object. The book_append_sheet and book_new helper functions⁶ create a SheetJS workbook object that can be exported:

import { utils } from 'xlsx';

// assuming `todos` is a VueJS ref whose value is an array of objects
const ws = utils.json_to_sheet(todos.value);
const wb = utils.book_new();
utils.book_append_sheet(wb, ws, "SheetJSQuasar");

The SheetJS write function⁷ with the option type: "buffer" will generate Uint8Array objects that can be converted to blobs and exported:

import { write } from 'xlsx';

// on iOS and android, `XLSX.write` with type "buffer" returns a `Uint8Array`
const u8: Uint8Array = write(wb, {bookType: "xlsx", type: "buffer"});

The cordova-plugin-file API writes the data to the filesystem. The code uses the File and Directory Entries API⁸:

// Request filesystem access for persistent storage
window.requestFileSystem(window.PERSISTENT, 0, function(fs) {
  // Request a handle to "SheetJSQuasar.xlsx", making a new file if necessary
  fs.root.getFile("SheetJSQuasar.xlsx", {create: true}, entry => {
    // Request a FileWriter for writing data
    entry.createWriter(writer => {
      // The FileWriter API needs an actual Blob
      const data = new Blob([u8], {type: "application/vnd.ms-excel"});
      // This callback is called if the write is successful
      writer.onwriteend = () => {
        // TODO: show a dialog
      };
      // writer.onerror will be invoked if there is an error in writing

      // write the data
      writer.write(data);
    });
  });
});

Demo

The demo draws from the ViteJS example. Familiarity with VueJS and TypeScript is assumed.

Ensure all of the dependencies are installed. Install the CLI globally:

npm i -g @quasar/cli cordova

(you may need to run sudo npm i -g if there are permission issues)

Create a new app:

npm init quasar

When prompted:

"What would you like to build?": App with Quasar CLI
"Project folder": SheetJSQuasar
"Pick Quasar version": Quasar v2 (Vue 3 | latest and greatest)
"Pick script type": Typescript
"Pick Quasar App CLI variant": Quasar App CLI with Vite
"Package name": (just press enter, it will use the default sheetjsquasar
"Project product name": SheetJSQuasar
"Project description": SheetJS + Quasar
"Author": (just press enter, it will use your git config settings)
"Pick a Vue component style": Composition API
"Pick your CSS preprocessor": None
"Check the features needed for your project": Deselect everything
"Install project dependencies": No

Install dependencies:

{\ cd SheetJSQuasar npm i npm i --save https://cdn.sheetjs.com/xlsx-${current}/xlsx-${current}.tgz}

Set up Cordova:

quasar mode add cordova

When prompted, enter the app id org.sheetjs.quasar.

It will create a new src-cordova folder. Continue in that folder:

cd src-cordova
cordova platform add ios
cordova plugin add cordova-plugin-wkwebview-engine
cordova plugin add cordova-plugin-file

:::note pass

If there is an error Could not load API for iOS project, it needs to be reset:

cordova platform rm ios
cordova platform add ios
cordova plugin add cordova-plugin-file

:::

Return to the project directory:

cd ..

Enable file sharing and make the documents folder visible in the iOS app. The following lines must be added to src-cordova/platforms/ios/SheetJSQuasar/SheetJSQuasar-Info.plist:

<plist version="1.0">
<dict>
<!-- highlight-start -->
  <key>UIFileSharingEnabled</key>
  <true/>
  <key>LSSupportsOpeningDocumentsInPlace</key>
  <true/>
<!-- highlight-end -->
  <key>CFBundleDevelopmentRegion</key>

(The root element of the document is plist and it contains one dict child)

Start the development server:

quasar dev -m ios

:::caution pass

If the app is blank or not refreshing, delete the app and close the simulator, then restart the development process.

:::

Add the Dialog plugin to quasar.config.js:

    framework: {
      config: {},
// ...
      // Quasar plugins
      // highlight-next-line
      plugins: ['Dialog']
    },

In the template section of src/pages/IndexPage.vue, replace the example with a Table, Save button and Load file picker component:

<template>
  <q-page class="row items-center justify-evenly">
    <!-- highlight-start -->
    <q-table :rows="todos" />
    <q-btn-group>
      <q-file label="Load File" filled label-color="orange" @input="updateFile"/>
      <q-btn label="Save File" @click="saveFile" />
    </q-btn-group>
    <!-- highlight-end -->
  </q-page>
</template>

This uses two functions that should be added to the component script:

    const meta = ref<Meta>({
      totalCount: 1200
    });
// highlight-start
    function saveFile() {
    }
    async function updateFile(v: Event) {
    }
    return { todos, meta, saveFile, updateFile };
// highlight-end
  }
});

The app should now show two buttons at the bottom:

:::caution pass

If the app is blank or not refreshing, delete the app and close the simulator, then restart the development process.

:::

Wire up the updateFile function:

import { defineComponent, ref } from 'vue';
// highlight-start
import { read, write, utils } from 'xlsx';
import { useQuasar } from 'quasar';
// highlight-end

export default defineComponent({
// ...
// highlight-start
    const $q = useQuasar();
    function dialogerr(e: Error) { $q.dialog({title: "Error!", message: e.message || String(e)}); }
// highlight-end
    function saveFile() {
    }
    async function updateFile(v: Event) {
// highlight-start
      try {
        const files = (v.target as HTMLInputElement).files;
        if(!files || files.length == 0) return;

        const wb = read(await files[0].arrayBuffer());

        const data = utils.sheet_to_json<any>(wb.Sheets[wb.SheetNames[0]]);
        todos.value = data.map(row => ({id: row.Index, content: row.Name}));
      } catch(e) { dialogerr(e); }
// highlight-end
    }

To test that reading works:

Download https://docs.sheetjs.com/pres.numbers
In the simulator, click the Home icon to return to the home screen
Click on the "Files" icon
Click and drag pres.numbers from a Finder window into the simulator.

Make sure "On My iPhone" is highlighted and select "Save"
Click the Home icon again then select the SheetJSQuasar app
Click the "Load" button, then select "Choose File" and select pres:

Once selected, the screen should refresh with new contents.

Wire up the saveFile function:

    function saveFile() {
// highlight-start
      /* generate workbook from state */
      const ws = utils.json_to_sheet(todos.value);
      const wb = utils.book_new();
      utils.book_append_sheet(wb, ws, "SheetJSQuasar");
      const u8: Uint8Array = write(wb, {bookType: "xlsx", type: "buffer"});
      const dir: string = $q.cordova.file.documentsDirectory || $q.cordova.file.externalApplicationStorageDirectory;

      /* save to file */
      window.requestFileSystem(window.PERSISTENT, 0, function(fs) {
        try {
          fs.root.getFile("SheetJSQuasar.xlsx", {create: true}, entry => {
            const msg = `File stored at ${dir} ${entry.fullPath}`;
            entry.createWriter(writer => {
              try {
                const data = new Blob([u8], {type: "application/vnd.ms-excel"});
                writer.onwriteend = () => {
                  try {
                    $q.dialog({title: "Success!", message: msg});
                  } catch(e) { dialogerr(e); }
                };
                writer.onerror = dialogerr;
                writer.write(data);
              } catch(e) { dialogerr(e); }
            }, dialogerr);
          }, dialogerr);
        } catch(e) { dialogerr(e) }
      }, dialogerr);
// highlight-end
    }

The page should revert to the old contents.

To test that writing works:

Click "Save File". You will see a popup with a location:

Find the file and verify the contents are correct. Run in a new terminal:

find ~/Library/Developer/CoreSimulator -name SheetJSQuasar.xlsx |
  while read x; do echo "$x"; npx xlsx-cli "$x"; done

Since the contents reverted, you should see

SheetJSQuasar
id,content
1,ct1
2,ct2
3,ct3
4,ct4
5,ct5

Use "Load File" to select pres.numbers again. Wait for the app to refresh.
Click "Save File", then re-run the command:

find ~/Library/Developer/CoreSimulator -name SheetJSQuasar.xlsx |
  while read x; do echo "$x"; npx xlsx-cli "$x"; done

The contents from pres.numbers should show up now, with a new header row:

SheetJSQuasar
id,content
42,Bill Clinton
43,GeorgeW Bush
44,Barack Obama
45,Donald Trump
46,Joseph Biden

Android

Create the Android project:

cd src-cordova
cordova platform add android
cd ..

Start the simulator:

quasar dev -m android