Angular 5 does not recognize the function submitEl.triggerEventHandler, resulting in an error

Greetings! I am currently working on writing unit test cases in Angular5 Jasmine related to submitting a form. Below is the structure of my form:

<form *ngIf="formResetToggle" class="form-horizontal" name="scopesEditorForm" #f="ngForm" novalidate (ngSubmit)="f.form.valid && isScopeValid() ? saveScope() : showErrorAlert('Please enter mandatory fields')">
     <input autofocus type="text" id="scopename" name="scopename" placeholder="Enter scope name" class="form-control" [(ngModel)]="scopeEdit.scopevalue" #scopename="ngModel" required />
     <button type="button" (click)="editorModal.hide()" class="btn btn-default" data-dismiss="modal">Cancel</button>
</form>

Now, let's take a look at my spec.ts file:

describe('ScopeEditorComponent', () => {

    let component: ScopeEditorComponent;
    let fixture: ComponentFixture<ScopeEditorComponent>;
    let submitEl: DebugElement;
    let scopeValue: DebugElement;

      beforeEach(async(() => {
        TestBed.configureTestingModule({
            imports: [
                HttpClientModule,
                 RouterTestingModule,
                 ],
            declarations: [
                ScopeEditorComponent,
                SearchBoxComponent,
                GroupByPipe,
            ]
 fixture = TestBed.createComponent(ScopeEditorComponent);
        component = fixture.componentInstance;
        service = new PermissionEndpointMock();
        fixture.detectChanges();


        submitEl = fixture.debugElement.query(By.css('button')).nativeElement;
        scopeValue = fixture.debugElement.query(By.css('#scopename'));
  }));

 it('should create the scope component', async(() => {
        expect(component).toBeTruthy();
    }));
     it('add scope', () => {
        let scope: Scope;
        scopeValue.nativeElement.value = "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="dca8b9afa89cb9a4bdb1acb0b9f2bfb3b1">[email protected]</a>";

        // Subscribe to the Observable and store the user in a local variable.
        component.addscopeEventEmitter.subscribe((value) => scope = value);
        // This sync emits the event and the subscribe callback gets executed above
        submitEl.triggerEventHandler('click', null);

        // Now we can check to make sure the emitted value is correct
        expect(scope.scopeid).toBe("123456");
    });

However, when running the code, an error stating "submitEl.triggerEventHandler is not a function" is encountered. Any assistance on resolving this issue will be greatly appreciated. Thank you!

Answer №1

attempt to utilize

submitButton = fixture.debugElement.nativeElement.querySelector('button');

after that, proceed with

submitButton.click();

Answer №2

triggerEventHandler cannot be found on the nativeElement; when working within the context of describe, modify

submitEl = fixture.debugElement.query(By.css('button')).nativeElement;

to,

submitEl = fixture.debugElement.query(By.css('button'));

Answer №3

I attempted the following approach:

submitButton = fixture.debugElement.nativeElement.querySelector('button');
submitButton.click();

However, this method only triggers a click event without actually initiating the click handler from the component. The only solution I discovered was to directly call the handler:

component.editorModal.hide()

Answer №4

Here are three crucial points to know about the triggerEventHandler() function:

  1. The event handler will only be activated if it was defined on the native element through Angular event bindings, @HostListener(), @Output decorators, or Renderer.listen().
  2. Triggering the event does not automatically initiate change detection; this responsibility falls on us to manually call for it.
  3. Contrary to common belief and practice, utilizing fakeAsync is unnecessary as the handler executes synchronously.

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