Engine API Reference - v2.6.1
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    Class ScriptType

    This is the legacy format for creating PlayCanvas script returned when calling pc.createScript(). You should not use this inherit from this class directly.

    Use Script instead.

    Hierarchy (View Summary)

    Index

    Constructors

    constructor

    Properties

    app entity

    Accessors

    enabled attributes scriptName

    Methods

    __initializeAttributes fire hasEvent initScript initScriptType off on once extend

    Events

    EVENT_ATTR EVENT_DESTROY EVENT_DISABLE EVENT_ENABLE EVENT_ERROR EVENT_STATE

    Constructors

    Properties

    app: AppBase

    The AppBase that the instance of this script belongs to.

    entity: Entity

    The Entity that the instance of this script belongs to.

    Accessors

    • set enabled(value: any): void

      True if the instance of this script is in running state. False when script is not running, because the Entity or any of its parents are disabled or the ScriptComponent is disabled or the Script Instance is disabled. When disabled, no update methods will be called on each tick. initialize and postInitialize methods will run once when the script instance is in the enabled state during an app tick.

      Parameters

      • value: any

      Returns void

    Methods

    __initializeAttributes

    • __initializeAttributes(force?: boolean): void

      Parameters

      • Optionalforce: boolean

        Set to true to force initialization of the attributes.

      Returns void

    • Fire an event, all additional arguments are passed on to the event listener.

      Parameters

      • name: string

        Name of event to fire.

      • Optionalarg1: any

        First argument that is passed to the event handler.

      • Optionalarg2: any

        Second argument that is passed to the event handler.

      • Optionalarg3: any

        Third argument that is passed to the event handler.

      • Optionalarg4: any

        Fourth argument that is passed to the event handler.

      • Optionalarg5: any

        Fifth argument that is passed to the event handler.

      • Optionalarg6: any

        Sixth argument that is passed to the event handler.

      • Optionalarg7: any

        Seventh argument that is passed to the event handler.

      • Optionalarg8: any

        Eighth argument that is passed to the event handler.

      Returns EventHandler

      Self for chaining.

      obj.fire('test', 'This is the message');

    • Test if there are any handlers bound to an event name.

      Parameters

      • name: string

        The name of the event to test.

      Returns boolean

      True if the object has handlers bound to the specified event name.

      obj.on('test', () => {}); // bind an event to 'test'
      obj.hasEvent('test'); // returns true
      obj.hasEvent('hello'); // returns false
    • Protected

      Expose initScript as initScriptType for backwards compatibility

      Parameters

      • args: any

        Initialization arguments

      Returns void

    • Detach an event handler from an event. If callback is not provided then all callbacks are unbound from the event, if scope is not provided then all events with the callback will be unbound.

      Parameters

      • Optionalname: string

        Name of the event to unbind.

      • Optionalcallback: HandleEventCallback

        Function to be unbound.

      • Optionalscope: any

        Scope that was used as the this when the event is fired.

      Returns EventHandler

      Self for chaining.

      const handler = () => {};
      obj.on('test', handler);

      obj.off(); // Removes all events
      obj.off('test'); // Removes all events called 'test'
      obj.off('test', handler); // Removes all handler functions, called 'test'
      obj.off('test', handler, this); // Removes all handler functions, called 'test' with scope this

    • Attach an event handler to an event.

      Parameters

      • name: string

        Name of the event to bind the callback to.

      • callback: HandleEventCallback

        Function that is called when event is fired. Note the callback is limited to 8 arguments.

      • Optionalscope: any = ...

        Object to use as 'this' when the event is fired, defaults to current this.

      Returns EventHandle

      Can be used for removing event in the future.

      obj.on('test', (a, b) => {
          console.log(a + b);
      });
      obj.fire('test', 1, 2); // prints 3 to the console

      const evt = obj.on('test', (a, b) => {
          console.log(a + b);
      });
      // some time later
      evt.off();

    • Attach an event handler to an event. This handler will be removed after being fired once.

      Parameters

      • name: string

        Name of the event to bind the callback to.

      • callback: HandleEventCallback

        Function that is called when event is fired. Note the callback is limited to 8 arguments.

      • Optionalscope: any = ...

        Object to use as 'this' when the event is fired, defaults to current this.

      Returns EventHandle

      • can be used for removing event in the future.
      obj.once('test', (a, b) => {
          console.log(a + b);
      });
      obj.fire('test', 1, 2); // prints 3 to the console
      obj.fire('test', 1, 2); // not going to get handled

    • Shorthand function to extend Script Type prototype with list of methods.

      Parameters

      • methods: any

        Object with methods, where key - is name of method, and value - is function.

      Returns void

      var PlayerController = pc.createScript('playerController');

      PlayerController.extend({
          initialize: function () {
              // called once on initialize
          },
          update: function (dt) {
              // called each tick
          }
      });

    Events

    EVENT_ATTR: string = 'attr'

    Fired when script attributes have changed. This event is available in two forms. They are as follows:

    1. attr - Fired for any attribute change. The handler is passed the name of the attribute that changed, the value of the attribute before the change and the value of the attribute after the change.
    2. attr:[name] - Fired for a specific attribute change. The handler is passed the value of the attribute before the change and the value of the attribute after the change.
    export class PlayerController extends Script {
        initialize() {
            this.on('attr', (name, newValue, oldValue) => {
                console.log(`Attribute '${name}' changed from '${oldValue}' to '${newValue}'`);
            });
        }
    };

    export class PlayerController extends Script {
        initialize() {
            this.on('attr:speed', (newValue, oldValue) => {
                console.log(`Attribute 'speed' changed from '${oldValue}' to '${newValue}'`);
            });
        }
    };
    EVENT_DESTROY: string = 'destroy'

    Fired when a script instance is destroyed and removed from component.

    export class PlayerController extends Script {
        initialize() {
            this.on('destroy', () => {
                // no longer part of the entity
                // this is a good place to clean up allocated resources used by the script
            });
        }
    };
    EVENT_DISABLE: string = 'disable'

    Fired when a script instance becomes disabled.

    export class PlayerController extends Script {
        initialize() {
            this.on('disable', () => {
                // Script Instance is now disabled
            });
        }
    };
    EVENT_ENABLE: string = 'enable'

    Fired when a script instance becomes enabled.

    export class PlayerController extends Script {
        initialize() {
            this.on('enable', () => {
                // Script Instance is now enabled
            });
        }
    };
    EVENT_ERROR: string = 'error'

    Fired when a script instance had an exception. The script instance will be automatically disabled. The handler is passed an Error object containing the details of the exception and the name of the method that threw the exception.

    export class PlayerController extends Script {
        initialize() {
            this.on('error', (err, method) => {
                // caught an exception
                console.log(err.stack);
            });
        }
    };
    EVENT_STATE: string = 'state'

    Fired when a script instance changes state to enabled or disabled. The handler is passed a boolean parameter that states whether the script instance is now enabled or disabled.

    export class PlayerController extends Script {
        initialize() {
            this.on('state', (enabled) => {
                console.log(`Script Instance is now ${enabled ? 'enabled' : 'disabled'}`);
            });
        }
    };

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