Validations

Validations are a way to validate the input of a field. They are defined in the Validations property of a control that implements IValidatable. The validations property is an array of validation objects which implements IValidation interface. They are some prebuilt validations that you can use or you can create your own validation. Unfortunetely, plain MAUI controls can't be validated at the moment.

You may visit Validations section of FormView documentation of InputKit to see existing validations.

If you're looking for DataAnnotations validation, you should check out the DataAnnotations documentation.

Validations are working compatible together FormView. So, you can use a FormView to create a form and validate the inputs.

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Usage

• Prebuilt validations are defined in InputKit.Shared.Validations namespace. You should add an xml namespace to use them or define your own namespace that contains your validation rules.

xmlns:validation="clr-namespace:InputKit.Shared.Validations;assembly=InputKit.Maui"

• Each UraniumUI Material control accepts validations as content. So, you can define validations in the control's content.

<material:TextField Title="Fullname" Text="{Binding FullName}">
    <validation:RequiredValidation />
    <validation:LettersOnlyValidation AllowSpaces="True" />
</material:TextField>

• Using a FormView is the easiest way to validate multiple inputs at the same time.

<input:FormView SubmitCommand="{Binding SubmitCommand}" Spacing="20">

    <material:TextField Title="Email" Text="{Binding Email}">
        <validation:RequiredValidation />
        <validation:RegexValidation Message="Please type a valid e-mail address." Pattern="{x:Static input:AdvancedEntry.REGEX_EMAIL}"/>
    </material:TextField>

    <material:CheckBox Text="I Accept Terms &amp; Conditions"
                        IsChecked="{Binding IsTermsAndConditionsAccepted}">
        <validation:RequiredValidation />
    </material:CheckBox>

    <Button Text="Submit"
            input:FormView.IsSubmitButton="True"
            StyleClass="FilledButton"/>
</input:FormView>

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Prebuilt Validations

UraniumUI Material doesn't provide any prebuilt validations. You can use validations from InputKit or create your own.

There are some built-in validations that can be used in your application. They are:

• RequiredValidation - Checks if the value is not null or empty.
• RegexValidation - Checks if the value matches the given regex pattern.
• MinLengthValidation - Checks if the string length is greater than or equal to the given length.
• MaxLengthValidation - Checks if the string length is less than or equal to the given length.
• MaxValueValidation - Checks if the value is less than or equal to the given value.
• MinValueValidation - Checks if the value is greater than or equal to the given value.
• NumericValidation - Checks if the value is a number.
• DigitsOnlyValidation - Checks if the value contains only digits.
• LettersOnlyValidation - Checks if the value contains only letters.

Creating Custom Validation

You can create your own validation by implementing IValidation interface. It has a Validate method that takes a object as parameter and returns bool as result. The parameter is the value of the control that the validation is applied to. The result is the validation result. If the result is false, the validation message will be shown.

public class MyEmailValidation : IValidation
{
    public string Message { get; set; } = "Please enter a valid email address.";

    public bool Validate(object value)
    {
        if (value is string text)
        {
            return text.Count(x => x == '@') == 1 && text.Split('@').Last().Length >= 2;
        }
        return false;
    }
}

Validation Supported Controls

• TextField : Any validation according to the selected item can be applied.
• PickerField : Any validation according to the selected item can be applied.
• DatePickerField : RequiredValidation, MinValueValidation and MaxValueValidation are supported.
• TimePickerField : RequiredValidation, MinValueValidation and MaxValueValidation are supported.
• CheckBox : Only RequiredValidation is supported.
• RadioButton (RadioButtonGroupView from InputKit)
• AdvancedSlider (From InputKit)