Multiple key binding on (keydown) event in angular 6

问题

I have used (keydown) event in angular 6 to bind key inputs

So on enter of 'Tab' and 'Enter' key i have to do my functionality and added a event.prevent default

But when Shift + Tab is entered it is also preventing the event

.html

<input type="text" [(ngModel)]="Result1 (keydown)="onKeydownMain($event)"  >

I dont want (keydown.shift.tab) event seperate..

.ts

public onKeydownMain(event): void {
    if (event.key === "Enter" || event.key === "Tab") {
                event.preventDefault();
                   // My Functionality goes here
    }
}

But the problem is when Shift + Tab is pressed , event is fired and functionality goes on, which i don't want.

How can i go this

I just want Shift + Tab to perform its default functionality on this input.

回答1:

You need to remove the shift in the if condition like this:

public onKeydownMain(event): void {
       if (!event.shiftKey && (event.key === "Enter" || event.key === "Tab")){
                event.preventDefault();
                   // My Functionality goes here
        }
    }

You can refer to https://www.w3schools.com/jsref/obj_keyboardevent.asp for KeyboardEvent

回答2:

Try avoiding the shift keyevent value 16 in your code. event.which is used to display the keyevent value.

alert(event.which);
event.preventDefault();
if (event.keyCode!=16 && (event.keyCode === 13 || event.keyCode === 9 )) {
    alert("Pressed enter");
}

来源：https://stackoverflow.com/questions/52665812/multiple-key-binding-on-keydown-event-in-angular-6