Angular 2: check if shift key is down when an element is clicked

In an Angular 2 app, i want the click event to trigger something different when the shift key is being held down. how to achieve this?

html is below:

<div class="item" *ngFor="#obj of available" (click)="toggleSelected(obj)"></div>


and i want to do something like this:

toggleSelected(obj) {
if(shift is pressed) {
do this
} else {
do that
}
}


so how can i detect if shift key is pressed? thanks!

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