You have two solutions:
Use
Form.Runinstead ofForm.RunResult.Runonly runs on successful results, so it doesn't run on startup (which triggers failure with no error message).Pattern-match the result value:
1 2 3 4 5
// ...
|> Form.RunResult (function
| Success result -> // do something with result
| Failure messages -> ()
)Thanks, it works.
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... |> Form.WithSubmit |> Form.RunResult (fun r -> it runs immediately, during the form rendering, so does not fit) |> Form.Render (fun ... submit -> Page.Doc( ..., saveClick = (fun _ _ -> submit.Trigger(); <here I need submit's result to store into a DB>; go another place) )