PersistenceModule
The
Persistence class encapsulates persistent objects.//==============================================================================
// The following example demonstrates how to store, retrieve and remove data
// across multiple sessions.
//
// Project setup:
// - Insert two rectangles
// - Insert text
// - Position the rectangles and text so that all are visible
// - Add 'data' to 'Whitelisted keys' under the 'Persistence' Capability
// - Add the 'Tap Gesture' capability under 'Touch Gestures'
//==============================================================================
// Load in the required modules
const Persistence = require('Persistence');
const Scene = require('Scene');
const TouchGestures = require('TouchGestures');
// Locate the rectangles and text in the Scene
const storeRectangle = Scene.root.find('rectangle0');
const removeRectangle = Scene.root.find('rectangle1');
const dataText = Scene.root.find('text0');
// Store a reference to the userScope
const userScope = Persistence.userScope;
// Create a JavaScript object to store the data
const data = { name: 'Spark AR' };
//==============================================================================
// How to get stored data
//==============================================================================
// Attempt to get the stored data and if successful...
userScope.get('data').then(function(result) {
// Output a success message with the data added
dataText.text = 'Successfully retrieved data ' + result.name;
// If not successful...
}).catch(function(error) {
// Output a failure message with the error returned
dataText.text = 'Failed to retrieve data, ' + error;
});
//==============================================================================
// How to store data
//==============================================================================
// Subscribe to tap gestures on the storeRectangle
TouchGestures.onTap(storeRectangle).subscribe(function() {
// Attempt to store the data and if successful...
userScope.set('data',data).then(function(result) {
// Output a success message
dataText.text = 'Successfully stored';
// If not successful...
}).catch(function(error) {
// Output a failure message with the error returned
dataText.text = 'Failed to store, ' + error;
});
});
//==============================================================================
// How to remove stored data
//==============================================================================
// Subscribe to tap gestures on the removeRectangle
TouchGestures.onTap(removeRectangle).subscribe(function() {
// Attempt to remove the data and if successful...
userScope.remove('data').then(function(result) {
// Output a success message
dataText.text = 'Successfully removed';
// If not successful...
}).catch(function(error) {
// Output a failure message with the error returned
dataText.text = 'Failed to remove, ' + error;
});
});
Property | Description |
userScope | (get) userScope: StorageScopeGets an instance of StorageScope corresponding to the user scope |
This module exposes no methods.
Class | Description |
The StorageScope class encapsulates different methods of storage for persistent objects. |
Last modified 3yr ago