angular.module('MyApp',[

  'ngMaterial'

])

.config(function($provide){

      $provide.decorator('$mdDialog', function($delegate) {

        $delegate.prompt = function(options){

           return angular.extend({

             controller : function(scope, $mdDialog){

                scope.hide = function(){

                  $mdDialog.hide();

                };

             },

             template: [

               '<md-dialog aria-label="Promp" class="md-default-theme">',

                   '<md-content class="md-default-theme">',

                     '<h2>My Prompt</h2>',

                     '<input type="text" />',

                     '<div class="md-actions">',

                       '<md-button ng-click="hide()" class="md-raised  md-primary" ng-click="showPrompt()">Ok</md-button>',

                     '</div>',

                   '</md-content>',

               '</md-dialog>'

             ].join('')

           },options);

        };

        return $delegate;

      });

})

.controller('MainController',function($scope,$mdDialog){

​

  $scope.showAlert = function(){

     $mdDialog.show(

        $mdDialog.alert()

        .title('This is an alert title')

        .content('You can specify some description text in here.')

        .ariaLabel('Alert Dialog Demo')

        .ok('Got it!')

        .targetEvent(document.body)

    );

  };

  $scope.showPrompt = function(){

     $mdDialog.show(

        $mdDialog.prompt()

    );

  };

});