Dealing with the 404 error for a missing resource in ocLazyLoad

I am seeking guidance on how to handle resource loading errors in ocLazyLoading. I have attempted to load some resources within the resolve section of my $stateProvider. One file, ctrl.js, loads successfully. However, another file, iam-not-there.js, fails to load due to its nonexistence.

My objective is to manage this "loading" error by continuing with the resolve process even if a resource loading error occurs. I want to be able to handle or catch a resource loading error effectively. Currently, everything works smoothly when all resources can be loaded. Yet, if one resource encounters an issue during loading, the application fails to progress to the resolve state. You can replicate this problem using the following plnkr example.

var myApp = angular.module("myApp", ['ui.router', 'oc.lazyLoad']);

myApp.config(function($stateProvider, $urlRouterProvider) { 
    $stateProvider
        .state('login', {
            url: '/',
            templateUrl: 'template.html',
            controller: 'LoginController',
            resolve: {
                deps: ['$ocLazyLoad', function($ocLazyLoad) {
                    return $ocLazyLoad.load({
                      name: "myApp",
                      files: [
                        'ctrl.js',
                        'iam-not-there.js'
                      ] 
                    });
                }]
            } 
        });

    $urlRouterProvider.otherwise('/');
});

Answer №1

When dealing with promises, it's important to note that errors can be caught, but this doesn't necessarily mean that the loading process will continue as expected. In some cases, if a dependency fails during the processing of multiple promises, the entire loading process may come to a halt.

This behavior is generally desirable, especially when certain files are required for dependencies to load correctly. These files should not be considered optional in order to ensure the reliability of the application.

However, if there are cases where a file truly is optional, it can be handled explicitly by specifying how to handle the error:

deps: ($ocLazyLoad, $q) => {
  return $q.all([
    $ocLazyLoad.load('iam-not-there.js').catch(err => {}),
    $ocLazyLoad.load({
      name: "myApp",
      files: ['ctrl.js']
    })
  ])
}

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