Hello, I'm looking for some assistance with a coding problem. Basically, I have an array of numbers which includes 5, 8, and 10. I need to create a form where users can input numbers. If the user inputs a number that is not 5, 8, or 10, I want to display an error message using (keyup) event. The error message should simply say "Wrong number length" in red color. Can anyone help me out with this?
let numbers = [2, 4, 6];
@ViewChild('inputElement') inputElement: ElementRef;
Make sure to assign a local reference #inputElement to your HTML input element. Then, in your TypeScript file, create an observable after the component has been initialized, for example, in ngAfterViewInit.
const textInput$ = fromEvent(this.inputElement.nativeElement, 'keyup').pipe(
debounceTime(500),
map(event => event as KeyboardEvent),
map(event => (event.target as HTMLInputElement).value),
distinctUntilChanged(),
);
textInput$.subscribe(input => {
if (numbers.includes(input.length)) {
displayError();
}
});
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