Showing alert in angularjs when user leaves a page

Question

I m an angularjs new bee  I m trying to write a validation which alerts the user when he tries to close the browser window   I have 2 links on my page v1 and v2 When clicked on the links it takes to the specific pages  Here is the code to redirect to v1 and v2  angular module  myApp     myApp filters    myApp services    myApp directives      config    routeProvider   function  routeProvider             routeProvider when   v1    templateUrl   pages v 1 html   controller  MyCtrl1             routeProvider when   v2    templateUrl   pages v 2 html   controller  MyCtrl2             routeProvider otherwise  redirectTo    v1            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  Any pointers on how to achieve this would be appreciated   I got an answer here but it pops up the message after every time interval   Updated Code   Controllers  function MyCtrl1          scope  on   locationChangeStart   function  event  next  current            if   your condition                 event preventDefault                 MessageService showConfirmation                   Are you sure                MessageService MessageOptions YES NO                     YES   function                          blockNavigation   false                       location url  location url next  hash                          rootScope  apply                                        NO   function                          MessageService clear                         log log  NO Selected                                                         MyCtrl1  inject         function MyCtrl2      MyCtrl2  inject

User · Answer

The other examples here work fine for the old versions of ui-router (>=0.3.x) but all state events, such as $stateChangeStart, are deprecated as of 1.0. The new ui-router 1.0 code uses the $transitions service. So you need to inject $transitions into your component then use the $transitions.onBefore method as the code below demonstrates.

$transitions.onBefore({}, function(transition) {
  return confirm("Are you sure you want to leave this page?");
});

This is just a super simple example. The $transitions service can accept more complicated responses such as promises. See the HookResult type for more information.

User · Answer

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

User · Answer

scope rtGo   function                 window sessionStorage removeItem  message                 window sessionStorage removeItem  status                scope init   function                   window sessionStorage removeItem  message                 window sessionStorage removeItem  status                 Reload page  using init

User · Answer

As you ve discovered above  you can use a combination of window onbeforeunload and  locationChangeStart to message the user  In addition  you can utilize ngForm  dirty to only message the user when they have made changes   I ve written an angularjs directive that you can apply to any form that will automatically watch for changes and message the user if they reload the page or navigate away   see https   github com facultymatt angular-unsavedChanges  Hopefully you find this directive useful

User · Answer

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  amp  amp  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  amp  amp  prompt  amp  amp   confirm prompt                         event preventDefault

User · Answer

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

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