Tips on patiently awaiting the completion of resource loading

Seeking guidance from AngularJS experts as I develop an AngularJS application with a control suite comprising a loading screen and a showing screen defined in HTML. The data that needs to be manipulated is stored in JSON files, like the one below:

{
  "Styles": [
    { "name": "Blue", "stylesheet": "/Resources/Stylesheets/Styles/Blue/OfficeUI.Style.Blue.min.css" },
    ...
    ...
  ],
  "DefaultStyle": "LightBlue",
  ...
  ...
}

The challenge lies in dynamically embedding stylesheets referenced in the JSON file on the page. Moving on to the AngularJS implementation, we start with defining the module:

var OfficeUI = angular.module('OfficeUIApplication', ['ngSanitize']);

Then, a service is created to load the JSON file:

OfficeUI.factory('OfficeUIConfigurationService', function($http) {
    // Service logic here
});

A controller handles the initialization process:

OfficeUI.controller('OfficeUIController', function(OfficeUIConfigurationService, $scope, $http) {
    // Controller logic here
});

The key objective is to prevent displaying the loading div until all resources (like CSS files) have been fully loaded. Any suggestions on handling this issue? Also, is there a way to extend this behavior to include ng-include directives, images, etc.? Your insights would be highly appreciated.

Thanks & Regards,

Answer №1

Avoid relying on timeouts to ensure your resources are ready within a specific timeframe.

setTimeout(function() {
        $scope.isInitialized = true;
        $scope.$apply();
    }, 2000);

Instead, consider using a file and module loader library like Angular with RequireJS

For guidance, take a look at this example of utilizing AngularJS + RequireJS

Answer №2

Tag has an "onload" event. More information can be found here. It's important to ensure browser compatibility for all browsers you intend to support.

<link rel="stylesheet" href="mystylesheet.css" onload="sheetLoaded()" onerror="sheetError()">

If not, alternative dynamic resource loading techniques can be considered. For instance, check out this. Additionally, third-party libraries like angular-load or requirejs could be utilized for dynamic resource loading as well.

The main question is how to wait until resources are ready

You can attach event handlers to "onload" (or specific events in third-party libraries) which will trigger once your resources are fully loaded and ready for use.

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