Altering the background-color of the navigation bar based on the current

As a newcomer to the Angular framework, my current objective is:

To dynamically change the background color of my navbar while scrolling on the homepage, and have it maintain a fixed background color when navigating to other pages.

To accomplish this goal, I have created a "scroll" directive with the following code:

app.directive("scroll", function ($window,$location) {
    return function(scope, element, attrs) {
      angular.element($window).bind("scroll", function() {          
        if (this.pageYOffset > 0) {
          scope.backgroundCol = "black";
        } else {
          scope.backgroundCol = "transparent";
        }
        scope.$apply();
      });
    };
});

I have been contemplating on whether to include a logic in this directive that checks the location and applies a fixed background color to the navbar if it is not on the homepage. Are there any alternative approaches that would be more efficient and organized?

Answer №1

One approach to achieve this could involve the utilization of ng-controller in combination with $location.

To illustrate:

<div ng-controller="uniqueController">
  <nav class="navbar navbar-default" ng-class="{ custom-navbar: isHomepage('/')}">
  </nav>
</div>

And within the controller:

function uniqueController($scope, $location)  { 
    $scope.isHomepage = function (currentLocation) { 
        return currentLocation === $location.path();
    };
}

Answer №2

If you're utilizing the ui-router library, one of the most effective approaches is to employ the isState filter:

<nav class="navbar navbar-default" ng-class="{'navbar-custom': ('app.home' | isState)}"></nav>

By doing so, there's no need to add any additional logic in your controller for verifying if you are currently on the correct page.

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