Unable to simulate keypress event in Angular 2 unit test (Jasmine)

Question

I am using a directive to get the data from input used as a filter text.

here is my hostlistener in the directive:

@HostListener(\'input\', [\'$event         


        

Answer 1

I've had some trouble simulating a keypress in a unit test also. But came across an answer by Seyed Jalal Hosseini. It might be what you're after.

If you're attempting to simulate a keypress you can trigger an event by calling dispatchEvent(new Event('keypress')); on the element.

Here is the answer I'm referring to which gives more detail : https://stackoverflow.com/a/37956877/4081730

If you want to set the key that was pressed, this can be done also.

const event = new KeyboardEvent("keypress",{
    "key": "Enter"
});
el.dispatchEvent(event);

Further information I've just come across: https://developer.mozilla.org/en-US/docs/Web/Guide/Events/Creating_and_triggering_events

Answer 2

it('should trigger a TAB keypress event on an element', () => { const tabKeypress = new KeyboardEvent('keypress', { // @ts-ignore keyCode: 9, // Tab Key cancelable: true }); const myTableEle = debugEle.nativeElement.querySelector('.your-element'); myTableEle.dispatchEvent(tabKeypress); fixture.detectChanges(); });

// @ts-ignore :- is to remove TS warning because keyCode is deprecated. Its not needed in case you want to set "key" property of KeyboardEvent.

Answer 3

If you wish to use a key code (or "which"), you can do this:

// @HostListener('document:keypress')

const escapeEvent: any = document.createEvent('CustomEvent');
escapeEvent.which = 27;
escapeEvent.initEvent('keypress', true, true);
document.dispatchEvent(escapeEvent);