Angular.js service for onBeforeUnload

npm install angular-beforeunload
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Confirm dialog pop up if they try and (or accidently click away from) the page.

angular.module('YOUR_APP', [
  .controller('MainCtrl', function(BeforeUnload) {
    // Bind a listener on your current $scope and save reference to it.
    var onbeforeunload = $scope.$on('$locationChangeStart', BeforeUnload.init('TOP_MESSAGE', 'BOTTOM_MESSAGE'))
    // In this controller the user will be prompted to
    // confirm their choice before they change their location.
    $scope.submitPage = function() {
      // If you invoking your reference then your listener becomes null.

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