re populating form which submits to a surfacecontroller - Using Umbraco and getting started

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DbdCopilotTrial 2 posts 32 karma points

Feb 21, 2023 @ 16:52
0

Re-Populating form which submits to a SurfaceController
I have googled this but have found no good answer.

I have a form which submits to an action in a SurfaceController.

The action does some things to the form data and if all is OK redirects. If it finds issues with the data it populates the modelstate errors collection and then calls

return CurrentUmbracoPage();

However this results in the form being rendered blank with my error message from the ModelState displayed at the top.

I would like to change this so that when the form re-renders it is populated with the users previous form submission

in normal MVC this would be
```
[HttpPost]
public async IActionResult SomePostHandler(ExampleViewModel vm)
{
    if (SometingIsWrong)
    {
      ModelState.AddModelError("ExampleViewModel", "Error message");
        return View(vm);  
    }
}
```
With the view having a reference to the viewModel like this

@model ExampleViewModel

and then the form fields being like this:
```
<input type="text" asp-for="ExampleViewModel.Name"/>
```
Any pointers would be greatly appreciated - either Im missing something really basic or Im doing something wrong (Is a surface controller even the right way to do it?)
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Dave Woestenborghs 3504 posts 12135 karma points MVP 9x admin c-trib

Feb 22, 2023 @ 10:07

Hi,

You can pass the posted form back to the view using viewdata.

[HttpPost]
public async IActionResult SomePostHandler(ExampleViewModel vm)
{
    if (SometingIsWrong)
    {
      ModelState.AddModelError("ExampleViewModel", "Error message");
this.ViewData["model"] = vm;
       return this.CurrentUmbracoPage();
    }
}

And then in your view can get read it from the view data.

@{
 var vm= this.ViewData["model"] as ExampleViewModel ?? new ExampleViewModel ();
}

Dave

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DbdCopilotTrial 2 posts 32 karma points

Mar 02, 2023 @ 17:28

0

Hi,

Thanks for the response, I ended up taking the post out of the surface controller and using a renderController instead with route hijacking - that let me specify a strongly typed model which I populate and pass back to the view.

Im not a massive fan of ViewData/TempData/ViewBag etc I've always been uneasy about them being untyped and having to cast them in the view.

Marking your answer as the solution as if I'd stuck with the SurfaceController as in the OP it would be the best way forward.

Thanks

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Re-Populating form which submits to a SurfaceController