Why does ng-click not work in case-1, but does in case-3?

Question

There is clearly something fundamental im not yet understanding.

Im trying to make user of the Modal module in Angular Ui.Bootstrap but im finding that my clicks are

Answer 1

For that to work, you have to define alert on your $scope:

$scope.alert = function(text) {
    alert(text);  
};

Relevant piece from documentation:

AngularJS restricts access to the Window object from within expressions since it's a known way to execute arbitrary Javascript code.

https://docs.angularjs.org/error/$parse/isecwindow