Angular JS - Update View text from contoller using $rootScope

Angular JS -  Update View text from contoller using $rootScope 
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if(!rootScope.sitename)
    {
        rootScope.sitename = "App";
        rootScope.searchcol =  "App";
    }

$scope.SearchDashboard = function(sitename, searchcol){
        rootScope.sitename = sitename; 
        rootScope.searchcol =  searchcol;
        $location.path('dashboard/'+'-'+sitename)  //reload the page to update
    }



view:
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  <a href="" ng-click="SearchDashboard(sitename,'Site')" title=" {{sitename}}" class="ng-binding">   {{sitename}}</a>