Is it possible to pass data into an AngularJS controller without relying on routes?

In my angular application, there is a controller that requires server-side initialization to happen before it is instantiated. I need this initialization process to be done synchronously so that the data can be fetched prior to the controller being called. Typically, I achieve this by synchronously loading and injecting data into controllers using routeProvider in the application configuration:

$routeProvider
        .when('/Home', {
            templateUrl: 'default/home', controller: 'homeController',
            resolve: { 'InitPageData': ['initPageService', function (initPageService) { return initPageService.init("home/initpage"); }] }
        })

However, I have one particular controller that does not have a specified route or templateUrl associated with it. This controller is part of a shared layout page used across multiple pages and routes. I attempted the following approach thinking that everything passing through the '/' route would go through it, but it did not work as expected:

.when('/', {    // doesn't work
            controller: 'appController',
            resolve: { 'AppData': ['initPageService', function (initPageService) { return initPageService.init("something/initpage"); }] }
        })

I am unaware of all the routes that will utilize this specific controller and I do not want to manually handle each one. Is there a way to universally resolve data and inject it into a controller regardless of where it is invoked? Any help on this matter would be greatly appreciated.

Answer №1

To streamline your controllers, consider making appController the parent controller of all others in your application.

Here's an example:

<html ng-controller="appController">

Within appController, you can set up a self-executing anonymous function to handle pre-loading tasks for all child controllers.

If you need to control specific behavior in child controllers, you can use scope variables in appController to manage them.

This is a common scenario where custom events are utilized to communicate "resolve" to other parts of the application. Since JavaScript is asynchronous, it's important to monitor properties, events on rootScope, or utilize promises to manage dependent tasks effectively.

Answer №2

If your goal is to avoid repeatedly setting the resolve property, one approach could be like the code snippet below.

.config(function($routeProvider) {
    function customWhen(path, config){
        if (/* add your path validation logic here */){
            config.resolve = { 'AppData': ['initPageService', function (initPageService) { return initPageService.init("something/initpage"); }] };
        }
        return $routeProvider.when(path, config);
    }
    customWhen('/Home', {
        templateUrl: 'default/home', controller: 'homeController'
    })
    .customWhen(...)
    ;
})

Hopefully, this solution sparks some inspiration for you.

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