Scripting API


Represents a source used to get and set the value of a StringSignal.

Typically, changing the value that a signal contains requires a total reassignment:

TouchGestures.onTap().subscribe((gesture) => {
  someSignal = Reactive.val("Hello");

In the example above, someSignal is bound to a completely new signal which itself contains the desired value.

The StringSignalSource API provides the ability to change the value of the original signal without reassignment, with behavior similar to that of non-reactive programming models.

The Scripting Writeable Signal Source capability must be enabled within the project's Properties to use this API.


// Creates a new StringSignalSource object and change's the signal value
// on a screen tap event.
// Required project capabilities:
// - TouchGestures (auto added on module import)
// - Scripting Writeable Signal Source

// Load in the required modules
const Reactive = require('Reactive');
const TouchGestures = require('TouchGestures');
const Diagnostics = require('Diagnostics');

(async function () {  // Enables async/await in JS [part 1]

  // Create a string signal source
  var stringSource = Reactive.stringSignalSource("StringSource");

  // Get the string signal from the source
  const stringSignal = stringSource.signal;

  // Set an initial value for the string signal

  // Add the signal to the Watch view"String value: ", stringSignal);

  // Create a variable to keep track of the tap count
  var count = 0;

  // Update the string's value each time a tap event is fired
  TouchGestures.onTap().subscribe(() => {

    // Increment 'count' value
    count += 1;

    // Set the value of the string signal to the value of 'count'

})(); // Enables async/await in JS [part 2]


(get) signal: StringSignal
(set) (Not Available)

The signal being monitored by the StringSignalSource object.

Accessing the signal's value before one has been assigned via set() will return an empty string.


dispose(): void

Disposes of the native resources associated with the StringSignalSource object.

The StringSignalSource object will still exist as a JavaScript object but will not receive updates through future calls to set(). Do not call dispose() until you're certain that the signal is no longer required.

When calling ReactiveModule.stringSignalSource, avoid reusing the sourceId of an object that you've called dispose() on.
set(value: StringSignal | string): void

Sets the value of the signal monitored by the StringSignalSource object to value.
The updated signal value will be propagated throughout all signals related to the StringSignalSource.

If set() is called before signal, signal will return the value assigned by set() when called, rather than the default empty string.

* value - the value to assign to the signal, as a string or StringSignal.