Proper application of this - encountering issues with property emit of undefined in Angular

I am working with an angular component and encountering the following code:

  @Output() fixPercentChanged = new EventEmitter<number>();

In addition, I have this event:

fixChanged(e) {
    setTimeout(() => {
      let fix = e.component.option('value');
      this.fixPercentChanged.emit(100 - fix);
    }, 100); 
  }

This event is connected to a keydown event of an input element in the markup:

<dxi-item dataField="fix" [label]="{text: 'Fix %'}" editorType="dxNumberBox"
                [editorOptions]="{format: '#,##0.00\'%\'', onKeyDown: fixChanged, valueChangeEvent: 'keyup'}">
        <dxi-validation-rule type="required" message="A mező kitöltése kötelező"></dxi-validation-rule>
      </dxi-item>

While the event is triggered, there seems to be an issue as the console indicates that fixPercentChanged is undefined. Upon printing this to the console, it returns the dx-number-box input element instead of referring to the component itself. Is there a way to modify the function to resolve this?

Answer №1

After analyzing the provided link, @jonrsharpe, it became evident that the correct syntax should be:

  fixChanged = (e) => {
    setTimeout(() => {
      let fix = e.component.option('value');
      this.fixPercentChanged.emit(100 - fix);
    }, 100); 
  }

It is worth noting that now, the reference to this points to the component itself and triggers the event emission.

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