Transmit information between controllers during pageload in AngularJS without utilizing $rootscope

I currently have 2 controllers set up as follows:

app.controller('ParentMenuController',
    function ($scope,MenuService) {
        $scope.contentLoaded = false;        
        $scope.showButton = false;
        $scope.showButton = MenuService.getStatus();
});

Second Controller:

app.controller('ChildMenuController',
    function ($scope,MenuService) {
        MenuService.setStatus(true);
});

Service Utilized:

app.factory('MenuService', function ($q,$http) {    
    var status= false;
    var setStatus=function(newObj){
        status=newObj;
    };

    var getStatus=function(){
        return status;
    };

    return {
        getStatus:getStatus,
        setStatus:setStatus
    };
});

The issue I am facing is that the line of code below is not functioning as expected, resulting in the status always remaining false.

$scope.showButton = MenuService.getStatus();

Although I can trigger the event on button click or user action, my goal is for the button to be invisible during page load. Once the ChildMenu controller executes, the parent controller's button should become visible. I prefer not to use $broadcast, as it requires $rootscope.

Please note: Both controllers and html files are quite extensive. Only relevant portions have been included here. The childMenuController (childMenu.html) has its own html file, while the ParentMenuController (parentMenu.html) also has a separate html file. Both html files are used as directives within the main index.html file.

Answer №1

Check out this example:

http://plnkr.co/edit/TepAZGOAZZzQgjUdSpVF?p=preview

To ensure that the properties are updated correctly, utilize a wrapper object instead of modifying the main object directly.

app.controller('ParentMenuController',
    function ($scope,MenuService) {
        $scope.contentLoaded = false;
        $scope.showButton = MenuService.getStatus();
});

app.controller('ChildMenuController',
    function ($scope,MenuService) {
        MenuService.setStatus(true);
});

app.factory('MenuService', function ($q,$http) {    
    var status= {value:false};
    var setStatus=function(newObj){
        status.value=newObj;
    };

    var getStatus=function(){
        return status;
    };

    return {
        getStatus:getStatus,
        setStatus:setStatus
    };
});

Your code remains unchanged, but now the state is contained within an object with a value property. This ensures that any changes made to the value in the service will be reflected for all instances that have requested that object.

Answer №2

It appears that your service is being called and this specific line of code is being executed.

$scope.showButton = MenuService.getStatus();

However, once the child controller is loaded, the status is only being set without retrieving it again to show the button. To display the button, you need to getStatus after setting it, as shown below:

app.controller('ChildMenuController', function($scope, MenuService) {
 MenuService.setStatus(true);
 $scope.$parent.showButton =  MenuService.getStatus();
});

This will properly set the button to true and it should be visible on the page.

I have created a sample using your code for reference, please check it out:

DEMO

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