Showing alert in angularjs when user leaves a page

The code for the confirmation dialogue can be written shorter this way:

$scope.$on('$locationChangeStart', function( event ) {    var answer = confirm("Are you sure you want to leave this page?")    if (!answer) {        event.preventDefault();    }});

Lets seperate your question, you are asking about two different things:

1.

I'm trying to write a validation which alerts the user when he tries to close the browser window.

2.

I want to pop up a message when the user clicks on v1 that "he's about to leave from v1, if he wishes to continue" and same on clicking on v2.

For the first question, do it this way:

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;}

And for the second question, do it this way:

You should handle the $locationChangeStart event in order to hook up to view transition event, so use this code to handle the transition validation in your controller/s:

function MyCtrl1($scope) {    $scope.$on('$locationChangeStart', function(event) {        var answer = confirm("Are you sure you want to leave this page?")        if (!answer) {            event.preventDefault();        }    });}

Here is the directive I use. 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();                }            });        }    };}]);