Adding a field type to Umbraco Forms

    This builds on the "adding a type to the provider model" chapter


    Add a new class to the Visual Studio solution, make it inherit from Umbraco.Forms.Core.FieldType and fill in the constructor:

    public class MyCustomField : Umbraco.Forms.Core.FieldType
        public MyCustomField()
            this.Id = new Guid("08b8057f-06c9-4ca5-8a42-fd1fc2a46eff"); // Replace this!
            this.Name = "My Custom Field";
            this.Description = "Render a custom text field.";
            this.Icon = "icon-autofill";
            this.DataType = FieldDataType.String;
            this.SortOrder = 10;
            this.SupportsRegex = true;
        // You can do custom validation in here which will occur when the form is submitted.
        // Any strings returned will cause the submit to be invalid!
        // Where as returning an empty ienumerable of strings will say that it's okay.
        public override IEnumerable<string> ValidateField(Form form, Field field, IEnumerable<object> postedValues, HttpContextBase context, IFormStorage formStorage)
            var returnStrings = new List<string>();
            if (!postedValues.Any(value => value.ToString().ToLower().Contains("custom"))) {
                returnStrings.Add("You need to include 'custom' in the field!");
            // Also validate it against the original default method.
            returnStrings.AddRange(base.ValidateField(form, field, postedValues, context, formStorage));
            return returnStrings;

    In the constructor, we specify the standard provider information (remember to set the ID to a unique ID).

    And then we set the field type specific information. In this case a preview Icon for the form builder UI and what kind of data it will return, this can either be string, longstring, integer, datetime or boolean.

    Partial view

    Then we will start building the view at Views\Partials\Forms\Fieldtypes\FieldType.MyCustomField.cshtml:

    @model Umbraco.Forms.Mvc.Models.FieldViewModel
    <input type="text" name="@Model.Name" id="@Model.Id" class="text" value="@Model.Value" maxlength="500"
            @{if (string.IsNullOrEmpty(Model.PlaceholderText) == false) { <text> placeholder="@Model.PlaceholderText" </text> }}
            @{if (Model.Mandatory || Model.Validate) { <text> data-val="true" </text> }}
            @{if (Model.Mandatory) { <text> data-val-required="@Model.RequiredErrorMessage" </text> }}
            @{if (Model.Validate) { <text> data-val-regex="@Model.InvalidErrorMessage" data-regex="@Html.Raw(Model.Regex)" </text> }} />

    The view takes care of generating the UI control and setting its value.

    On the view, it is important to note that the ID attribute is fetched from @Model.Id. You'll also see that we are using jQuery validate unobtrusive to perform client side validation so that's why we are adding the data* attributes.

    Umbraco backoffice view

    The final step involves building the HTML view which will be rendered in Umbraco as an example of how our end result will look. We will create a file at App_Plugins\UmbracoForms\Backoffice\Common\FieldTypes\mycustomfield.html which will contain the following:

        type="text" tabindex="-1"
        style="max-width: 100px"