How to define two angular apps / modules in one page?


I'm trying to add two angular apps / modules to one page. In the fiddles below you can see that always only the first module, referenced in the html code, will work correctly, whereas the second is not recognized by angular.

In this fiddle we can only execute the doSearch2 method, whereas in this fiddle only the doSearch method works correctly.

I'm looking for the way how to correctly place two angular modules into one page.

Only one AngularJS application can be auto-bootstrapped per HTML document. The first ngApp found in the document will be used to define the root element to auto-bootstrap as an application. To run multiple applications in an HTML document you must manually bootstrap them using angular.bootstrap instead. AngularJS applications cannot be nested within each other. -- http://docs.angularjs.org/api/ng.directive:ngApp

See also


I created an alternative directive that doesn't have ngApp's limitations. It's called ngModule. This is what you code would look like when you use it:

<!DOCTYPE html>
<html>
    <head>
        <script src="angular.js"></script>
        <script src="angular.ng-modules.js"></script>
        <script>
          var moduleA = angular.module("MyModuleA", []);
          moduleA.controller("MyControllerA", function($scope) {
              $scope.name = "Bob A";
          });

          var moduleB = angular.module("MyModuleB", []);
          moduleB.controller("MyControllerB", function($scope) {
              $scope.name = "Steve B";
          });
        </script>
    </head>
    <body>
        <div ng-modules="MyModuleA, MyModuleB">
            <h1>Module A, B</h1>
            <div ng-controller="MyControllerA">
                {{name}}
            </div>
            <div ng-controller="MyControllerB">
                {{name}}
            </div>
        </div>

        <div ng-module="MyModuleB">
            <h1>Just Module B</h1>
            <div ng-controller="MyControllerB">
                {{name}}
            </div>
        </div>
    </body>
</html>

You can get the source code at:

http://www.simplygoodcode.com/2014/04/angularjs-getting-around-ngapp-limitations-with-ngmodule/

It's essentially the same code used internally by AngularJS without the limitations.


Why do you want to use multiple [ng-app] ? Since Angular is resumed by using modules, you can use an app that use multiple dependencies.

Javascript:

// setter syntax -> initializing other module for demonstration
angular.module('otherModule', []);

angular.module('app', ['otherModule'])
.controller('AppController', function () {
    // ...do something
});

// getter syntax
angular.module('otherModule')
.controller('OtherController', function () {
    // ...do something
});

HTML:

<div ng-app="app">
    <div ng-controller="AppController">...</div>
    <div ng-controller="OtherController">...</div>
</div>

EDIT

Keep in mind that if you want to use controller inside controller you have to use the controllerAs syntax, like so:

<div ng-app="app">
    <div ng-controller="AppController as app">
        <div ng-controller="OtherController as other">...</div>
    </div>
</div>

You can bootstrap multiple angular applications, but:

1) You need to manually bootstrap them

2) You should not use "document" as the root, but the node where the angular interface is contained to:

var todoRootNode = jQuery('[ng-controller=TodoController]');
angular.bootstrap(todoRootNode, ['TodoApp']);

This would be safe.


Manual bootstrapping both the modules will work. Look at this

  <!-- IN HTML -->
  <div id="dvFirst">
    <div ng-controller="FirstController">
      <p>1: {{ desc }}</p>
    </div>
  </div>

  <div id="dvSecond">
    <div ng-controller="SecondController ">
      <p>2: {{ desc }}</p>
    </div>
  </div>



// IN SCRIPT       
var dvFirst = document.getElementById('dvFirst');
var dvSecond = document.getElementById('dvSecond');

angular.element(document).ready(function() {
   angular.bootstrap(dvFirst, ['firstApp']);
   angular.bootstrap(dvSecond, ['secondApp']);
});

Here is the link to the Plunker http://plnkr.co/edit/1SdZ4QpPfuHtdBjTKJIu?p=preview

NOTE: In html, there is no ng-app. id has been used instead.


I made a POC for an Angular application using multiple modules and router-outlets to nest sub apps in a single page app. You can get the source code at: https://github.com/AhmedBahet/ng-sub-apps

Hope this will help