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AngularJS: sync $location.search with an input value

I have used AngularJS for a while and to me this seems to be the best MVC javascript framework.

Today I wanted to implement a search which uses an input and a hash query string like in google. The input value and url have to be synced like:

index.html#?term=something

To do this we have to inject $location into our angular control. See the Angular Guide about $location. Then we have to observe both the $scope.term (which is bound to the input value) and $location.search().

<!doctype html>
<html ng-app>
  <head>
    <script src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.2/angular.min.js">
    </script>
    <script src="project.js"></script>
  </head>
  <body>
    <h2>Hash Search</h2>
    <div ng-controller="SearchCtrl">
        <input type="text" ng-model="term"/>
    </div>
  </body>
</html>

and javascript (project.js):

function SearchCtrl($scope, $location) {

	var termKey = "term";

	$scope.$watch(function () { return $location.search(); }, function() {
	  $scope.term = $location.search()[termKey] || "";
	});
	
	$scope.$watch('term', function(term) {
	   $location.search(termKey, term);
	});
	
}

In order to be able to listen to changes on $location.search, you have to provide an anonymous function in $watch. Thanks to Renan Tomal Fernandes' answer on stackoverflow.

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One response to “AngularJS: sync $location.search with an input value

  1. Nikita Tovstoles (@NikitaTovstoles) 2013-11-09 at 22:24

    how does the above not cause a circular loop (since two $watch invocations are ‘watching’ respective outputs)? thanks!

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