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Recursive Menus with AngularJS Templates

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Recursive Menus with AngularJS Templates

· Web Dev Zone ·
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Deploying code to production can be filled with uncertainty. Reduce the risks, and deploy earlier and more often. Download this free guide to learn more. Brought to you in partnership with Rollbar.

AngularJS supports Templates and you can do a lot of great stuff with them. Recently I created a tree-like structure with an unknown depth. Templates are great to work with recursion.

Here is a simple controller::

function MenuCtrl ($scope, $http) {
   $scope.menuItems = [];
 
   $scope.loadMenu = function() {
      $http.get('menu/all').success(function(items) {
         $scope.menuItems = items;
      });
   };
 
   $scope.loadMenu();
}

This controller is supposed to load the whole menu at once. You can rewrite this to work with “ng-click”. I want to keep this example simple, so I just loaded the whole tree at once.

A menuItem has children property which can contain menuItems.

Now let’s create a template which calls itself:

<script type="text/ng-template" id="tree-renderer.html">
 <a href="{{menu.url}}">{{ menuItem.name }}</a>
 <ul>
   <li ng-repeat="menuItem in menuItem.children" ng-include="'tree-renderer.html'></li>
 </ul>
</script>

As you can see the ng-include directive can get a string as parameter. Please mind the extra ‘ surrounding the template id in line 4 if you pass a string. You can reference the same template from inside the template.

The initial call would look almost exactly like the template:

<ul>
  <li ng-repeat="menuItem in menuItems" ng-include="'tree-renderer.html'"></li>
</ul>

The output is a nested tree of lists.

The good thing with this approach is you benefit from two-way-data-binding. If you update your model your view is updated too. That way you can build up a very powerful menu builder like I did.

Surprisingly easy, as I found afterwards.

Deploying code to production can be filled with uncertainty. Reduce the risks, and deploy earlier and more often. Download this free guide to learn more. Brought to you in partnership with Rollbar.

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