Class ScrollbarComponent

entity

system

fire

• fire(
      name: string,
      arg1?: any,
      arg2?: any,
      arg3?: any,
      arg4?: any,
      arg5?: any,
      arg6?: any,
      arg7?: any,
      arg8?: any,
  ): EventHandler

  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.

  Example

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

• hasEvent(name: string): boolean

  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.

  Example

  obj.on('test', function () { }); // bind an event to 'test'
  obj.hasEvent('test'); // returns true
  obj.hasEvent('hello'); // returns false
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off

• off(name?: string, callback?: HandleEventCallback, scope?: any): EventHandler

  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.

  Example

  const handler = function () {
  };
  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
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on

• on(name: string, callback: HandleEventCallback, scope?: any): EventHandle

  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.

  Example

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

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

• once(name: string, callback: HandleEventCallback, scope?: any): EventHandle

  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.

  Example

  obj.once('test', function (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
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