Using Cache API for MVC Views

Creating a basic MVC form, I have been experimenting with the Javascript Cache API to store all my css, js, and html files. This way, even if users are in areas with unreliable internet access, they can still access my web form. In addition to IndexedDB and service workers, which help detect connectivity status and save data locally when there is no connection, I am utilizing caching techniques.

While tutorials have made it seem easy to cache physical files like css, html, and js, the routing nature of MVC adds complexity. I have set up the basic views for Index, Create, Edit, and Details. When trying to cache specific URLs like:

var urlsToCache = [

'/App/Details',
'/App/Edit',
'/App/Create',
'/App/Index',

'/App/Content/bootstrap.css',
'/App/Content/site.css',
'/App/Scripts/jquery-1.10.2.js',
'/App/Scripts/jquery.form.js',
'/App/sw.js',
'/App/Scripts/bootstrap.js',

] ...all files get cached except for DETAILS and EDIT. Surprisingly, INDEX and CREATE cache successfully despite not being physical files. The assumption is that DETAILS and EDIT fail to cache due to their reliance on querystring parameters.

My question is, is there a way to cache these two views as well? Alternatively, does anyone know of a NuGet package that could help with this issue?

javascriptasp.netasp.net-mvcservice-workercacheapi

Answer №1

In the GET method for my Edit action, I made a change to return an empty Model if there was no ID provided.

if (id == null)
{
//return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
return View();
}

This adjustment enabled me to access the Edit page without a querystring variable and avoiding an error message. Even though the page loads with no data, it allows me to cache it. To handle offline scenarios, I might need to instruct my service worker to check the online status of the page. If it is online, proceed with the request as usual; otherwise, retrieve from local storage and manually populate the fields.

This experience serves as a valuable lesson for those developing Offline-enabled apps with MVC and utilizing Cache API. Removing lines that trigger bad request errors in CRUD views when ID numbers are absent can facilitate caching of pages. Additionally, custom code must be implemented to manage offline retrieval and presentation during page loading, maintaining the functionality of MVC/Razor features while online.

It's worth noting that "/App/Edit" will be cached. However, accessing "/App/Edit/2" won't match a URL in the cache, prompting an offline message. To work around this issue, you can modify your Index page to send the ID via post. Include a form on the page directing to the Edit action and change the link to an underlined span with an onclick event setting the value of a hidden field to the ID. Another hidden field indicating the need for retrieval instead of update should also be passed, considering the controller has separate GET and POST actions for Edit. The GET action, even if unnecessary, should be retained for caching purposes. The retrieval typically performed in the GET action should now be executed in the POST action with an if statement checking for the hidden field flag.

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