AngularJS ui-route exit page

This could be achieved in multiple ways,

1- Use $locationChangeStart technique and verify if this is current location before displaying message. example below,

 $scope.$on('$locationChangeStart', function( event, next, current) {
    // match Current URL and If it true show message.
    if (current.match("\/yourCurrentRoute")) {
          var answer = confirm("Are you sure you want to leave this page?");
          if (!answer) {
               event.preventDefault();
          }else {
              //Do whatever else you want to do 
          }
    }  
});

2- In case you are using Ui-Router it has onExit call back option, example below,

    $stateProvider.state("contacts", { 
           template: "<h1>{{title}}</h1>",
           resolve: { title: 'My Contacts' },
           controller: function($scope, title){
                  $scope.title = title;
           },
          onExit: function(title){
              if(title){ ... do something ... }
          }
   })

3 - there is a non-angular way to do it as well.

window.onbeforeunload = function (event) {
  var message = 'Sure you want to leave?';
  if (typeof event == 'undefined') {
    event = window.event;
  }
  if (event) {
    event.returnValue = message;
  }
  return message;
}

4 - Use this directive if this page has form, It automatically cleans itself up when the form is unloaded. If you want to prevent the prompt from firing (e.g. because you successfully saved the form), call $scope.FORMNAME.$setPristine(), where FORMNAME is the name of the form you want to prevent from prompting.

.directive('dirtyTracking', [function () {
    return {
        restrict: 'A',
        link: function ($scope, $element, $attrs) {
            function isDirty() {
                var formObj = $scope[$element.attr('name')];
                return formObj && formObj.$pristine === false;
            }

            function areYouSurePrompt() {
                if (isDirty()) {
                    return 'You have unsaved changes. Are you sure you want to leave this page?';
                }
            }

            window.addEventListener('beforeunload', areYouSurePrompt);

            $element.bind("$destroy", function () {
                window.removeEventListener('beforeunload', areYouSurePrompt);
            });

            $scope.$on('$locationChangeStart', function (event) {
                var prompt = areYouSurePrompt();
                if (!event.defaultPrevented && prompt && !confirm(prompt)) {
                    event.preventDefault();
                }
            });
        }
    };
}]);

5- there is another way to use $destroy, it is fired when controller is destroyed , write it inside controller.

 $scope.$on('$destroy', function () {
     // display error message 
 });