How to Handle Anchor Hash Linking in AngularJS without Unintended Routing?

Handling Anchor Hash Linking in AngularJS

When working with AngularJS, handling anchor hash linking can be challenging. Anchor hash linking allows users to navigate within a page by clicking on links that lead to specific sections. However, in AngularJS, such links often lead to unintended routing behavior.

The issue arises when AngularJS intercepts the anchor hash link and attempts to route to a different page. This problem is frustrating, especially for applications that require in-page navigation.

The Solution: Using $anchorScroll()

The solution to this problem lies in the $anchorScroll() service provided by AngularJS. This service enables you to smoothly scroll to a specific element within a page based on its ID.

Implementation

To implement $anchorScroll(), follow these steps:

1. Inject $anchorScroll() into your controller.
2. Define a function that receives an ID parameter.
3. Update the $location.hash to match the provided ID.
4. Invoke $anchorScroll() to perform the scrolling.

Example:

<code class="javascript">app.controller('TestCtrl', function($scope, $location, $anchorScroll) {
   $scope.scrollTo = function(id) {
      $location.hash(id);
      $anchorScroll();
   }
});

<a ng-click="scrollTo('foo')">Foo</a>

<div id="foo">Here you are</div></code>

Using $anchorScroll() with Routing

In scenarios involving AngularJS routing, you can extend the $anchorScroll() approach as follows:

1. Set up your routing as usual.
2. Add a listener for the '$routeChangeSuccess' event.
3. Within the event handler, update the $location.hash to the specified "scrollTo" parameter.
4. Invoke $anchorScroll() to perform the scrolling.

Simplified Approach

For a more straightforward solution, you can listen for the '$routeChangeSuccess' event and check if an anchor hash is present:

<code class="javascript">app.run(function($rootScope, $location, $anchorScroll) {
  //when the route is changed scroll to the proper element.
  $rootScope.$on('$routeChangeSuccess', function(newRoute, oldRoute) {
    if($location.hash()) $anchorScroll();  
  });
});</code>

With this modification, your links can simply include an anchor hash:

<code class="html"><a href="#/test#foo">Test/Foo</a></code>

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