Determine whether MudTextField is valid without updating UI

Question

I'm using Blazor and MudBlazor.

If I call myMudTextField.Validate() then it validates the field and updates the UI - shows validation errors, etc.

Can I determine whether the field is valid without updating the UI? For example, something like myMudTextField.IsValid.

Answer 1

I think you can implement custom validations with the use of yields as a field validation, if that's what you need. Here it's an example of how i use it!

Page.razor:

<MudTextField Validation="@(new Func<int, IEnumerable<string>>(PtoVtaStrength))" T="int" Pattern="^[+-]?([0-9]+\.?[0-9]*|\.[0-9]+)$" Placeholder="123"  Required="true" RequiredError="PtoVta required" Text="@PtoVta.ToString()" />

Page.razor.cs

private IEnumerable<string> PtoVtaStrength(int value)
{
    if (value <= 0)
    {
        yield return "IsValid";
        yield break;
    }
}

UPDATE:

If you want to check if it's valid or not with mud blazor, at the moment you need to implement custom validation On property changed!

Page.Razor:

<MudTextField Validation="@(new Func<int, IEnumerable<string>>(PtoVtaStrength))" T="int" Placeholder="123"  Required="true" RequiredError="Punto de venta requerido" ValueChanged="@OnPtoVtaChanged" Text="@PtoVta.ToString()" />

Page.razor.cs:

private Task OnPtoVtaChanged(int value)
{
    //Do your validation here
    //if true
    PtoVta = value;
    //else
    PtoVta = 0
    return Task.CompletedTask;
}