In Ionic 2, any modifications made to the data model will only be reflected in the user interface after there is

Q) Why does my data seem to magically appear on the UI after interacting with it, even though I have made changes in the backend?

For instance, when fetching and updating data bound to a list, such as:

this._LocalStorageService.getClients().then(
  (data) => {    
    this.clients = (data.res.rows.length == 1) ? <Client[]>JSON.parse(data.res.rows.item(0).clients) : [];
    this.showNoDataPresent = (this.clients.length == 0);  
  },
  (error) => {
    this._LogService.error(JSON.stringify(error.err));
  }
);

The clients list remains invisible on the UI until an interaction triggers its appearance, like clicking the menu button or focusing on a search field.

Answer №1

Ensure that you have updated to beta.6 and carefully follow the instructions provided below (as there are some necessary changes in addition to simply updating the dependencies in package.json).

  1. Upgrade the Ionic CLI to the most recent version: npm install -g ionic@beta

  2. If you are upgrading a project using Ionic 2.0.0-beta.3 or earlier, refer to the following guide first.

  3. Delete the line import 'es6-shim' from app.ts/app.js.

  4. Insert es6-shim.min.js before angular2-polyfill.js in the index.html file:

     <script src="build/js/es6-shim.min.js"></script>
      <!-- Zone.js and Reflect-metadata -->
      <script src="build/js/angular2-polyfills.js"></script>
      <!-- The bundle created from the app's source code -->
      <script src="build/js/app.bundle.js"></script>
    
  5. Update your package.json (do not copy and paste, use these as a reference and update yours accordingly):

    "dependencies": { "angular2": "2.0.0-beta.15", "es6-shim": "^0.35.0", "ionic-angular": "2.0.0-beta.6", "ionic-native": "^1.1.1", "ionicons": "3.0.0-alpha.3", "reflect-metadata": "0.1.2", "rxjs": "5.0.0-beta.2", "zone.js": "^0.6.11" }

  6. In your package.json, update the version of ionic-gulp-scripts-copy to ^1.0.1.

  7. Run npm install from within your project folder to install the new packages.

  8. Refer to the changelog149 for any significant changes and adjust your project accordingly.

Source :

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