alert after click chip in materialize in Angularjs

I have the following chip with materialize:

<div class="chip">
  tag
  <i class="close material-icons" ng-click="hide_chip(this)">close</i>
</div>

my controller:

$scope.hide_chip = function(elem){
        var r = confirm("Are you sure?");
        if (r == true) {
            var chip = elem.parentNode;
            chip.style.display = 'none';
        }
    }

I want to know how to show an alert when user clicks the close icon?
the alert should have yes or no button if it is yes the chip close, but if user click no the chip does not close

My error is “chip is undefined”, and when r is false the chip disappears

Someone can help me? thanks

Source: AngularJS

from Angular Questions https://angularquestions.com/2017/10/19/alert-after-click-chip-in-materialize-in-angularjs/
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