In the midst of developing a complex AngularJS application, my main focus is on bundling all Ajax code within separate services that can be accessed by controllers for data retrieval. However, there arises an issue concerning the necessity to track the status of each ajax call and present corresponding information to the user. This involves scenarios where data may not be found, loading is in progress, or errors impede data loading. It is crucial to notify the user with appropriate messages such as a loading message, "no data found" message, or an error notification.
Consider the ProjectService. If there exists a method like getAllProjects which should ideally return a projects array, it remains uncertain how to monitor server communication status.
So, how do I communicate to the controller about whether data has been loaded, is in the process of loading, or if an error has occurred? The current solution I have devised involves implementing callbacks, as illustrated in the pseudo code below. Are there more efficient approaches to achieve this goal that I might have overlooked?
Thank you.
app.controller( "ProjectController", function( $scope, ProjectService ){
// Initialize the loadStatus
$scope.loadStatus = "loading";
// Initially, populate the projects array with empty values that will be updated
// upon receiving data from the server through the callback function
$scope.projects = ProjectService.getProjects(function( status ){
// Notify the controller of any status changes
setStatus( status );
});
function setStatus( ){
$scope.loadStatus = status;
// Implement necessary updates in the view when the status changes
}
});
app.service( "ProjectService", function( $resource ){
return {
getAllProjects: function(){
// Retrieve and manage data from the server
}
};
});