Restrict removal of items on Backspace

[amit-m]

In Angular 1.x, I added some custom code to handle this requirement, here is the code snippet

$scope.hackForBackspace = function(){
// if backspace return false
if(event.keyCode == 8){return false;}
}

This works fine in Chrome, but does not work in FF and IE.

Always 'Error: event is not defined' is coming in console log.

Even I tried to pass on-tag-removing="hackForBackspace($event);" - that also not working.

Please help.