How to only allow text in angular 9 ?

keydown vs keyup ?

If you print event.target.value then keydown event will give previous character only, so it will be quiet difficult for you to perform some validations with keydown – event.target.value.

If you press, “ngd” then keydown prints “ng” only on press of d value.

But keyup prints “ngd” only when d character is pressed.

So the winner for this use case is keyup

In angular template:

(keyup)="allowOnlyText"

In angular component:

allowOnlyText(event): boolean{
	const charCode = (event.which) ? event.which : event.keyCode;
    if (charCode > 90 && charCode < 97 ) {
      return false;
    }
	
	if(charCode < 65 || charCode > 122){
	return false;
	}	
    return true;
}

How to check whether the string contains number or not ?

        isTextOnly(event): boolean {		
		if(this.checkNameContainsNumber(event.target.value)){
			return false;
		}

		return true;
	}

	isContainsNumbers(value:string):boolean{
		for(var temp=0;temp<value.length;temp++){
			var numberValues = value.charCodeAt(temp);
			if(numberValues>=48 && numberValues<=57){
				console.log("number is found, so returning true");
				return true;
			}
		}
		return false;
	}