Utilize specific Angular JS methods just a single time

Question

Utilize specific Angular JS methods just a single time

In my Angular application, I have the following architecture:

Index Page -> Shell Page -> User view (User can open subview from here)

Every route change in my application goes through the Shell page. There is a function on the Shell page called activate which should only be invoked the very first time the application is loaded.

// The activate function displays a toaster message when the application is loaded
    function activate() {
        logger.success(config.appTitle + ' has been loaded!', null);
    }

As the routing changes go through the Shell page, the activate method is mistakenly invoked even when transitioning between views. I want the activate method to only run the first time the application loads, not during route changes.

How can I make this work as intended? Thank you.

javascript angularjs angularjs-ng-route

Answer 1

Answer №1

To ensure efficient code organization, it is recommended to transfer the logic for the activate method to a service in Angular. By utilizing Angular services, you can take advantage of their singleton nature, ensuring only one object is created and injected wherever needed. This approach allows for maintaining simple state persistence over time. Consider creating a generic utility service as follows:

(function() {
  'use strict';

  angular
    .module('myApp')
    .service('UtilityService', UtilityService);

  function UtilityService() {
     var shouldActivate = true;

     this.activateComplete = function(){
        shouldActivate = false;
     }

     this.canActivate = function(){
       return shouldActivate;
     }
  }
})();

Subsequently, within the Shell controller, you would invoke the UtilityService to verify if activation is permitted. If so, the activate function will be executed followed by the completion of activation using the completeActivate function from the UtilityService. This ensures that any future checks on canActivate will yield a false result:

(function() {
  'use strict';

  angular
    .module('myApp')
    .controller('ShellController', ShellController);

  /** @ngInject */
  function ShellController(UtilityService) {
    var vm = this;

    vm.activate = activate() {
      logger.success(config.appTitle + ' loaded!', null);
    }

    if(UtilityService.canActivate()){
       vm.activate();
       UtilityService.activateComplete();
    }
  }
})();

Answer 2

To ensure efficient code organization, it is recommended to transfer the logic for the activate method to a service in Angular. By utilizing Angular services, you can take advantage of their singleton nature, ensuring only one object is created and injected wherever needed. This approach allows for maintaining simple state persistence over time. Consider creating a generic utility service as follows:

(function() {
  'use strict';

  angular
    .module('myApp')
    .service('UtilityService', UtilityService);

  function UtilityService() {
     var shouldActivate = true;

     this.activateComplete = function(){
        shouldActivate = false;
     }

     this.canActivate = function(){
       return shouldActivate;
     }
  }
})();

Subsequently, within the Shell controller, you would invoke the UtilityService to verify if activation is permitted. If so, the activate function will be executed followed by the completion of activation using the completeActivate function from the UtilityService. This ensures that any future checks on canActivate will yield a false result:

(function() {
  'use strict';

  angular
    .module('myApp')
    .controller('ShellController', ShellController);

  /** @ngInject */
  function ShellController(UtilityService) {
    var vm = this;

    vm.activate = activate() {
      logger.success(config.appTitle + ' loaded!', null);
    }

    if(UtilityService.canActivate()){
       vm.activate();
       UtilityService.activateComplete();
    }
  }
})();

Utilize specific Angular JS methods just a single time

Answer №1

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