Sorry to bump but it would be great if anyone had an idea about how to do this?

Hey Dominic

I haven't tested it, but something like this should work:

if (error) //your error condition
{
    e.Form.MessageOnSubmit = "Your error message";
    return WorkflowExecutionStatus.Failed;
}

Obviously, this will only work if you don't send the user to a new page after submitting the form.

Hope that helps

/Theo

Did you solve the problem?

Workflows status doesn't have any impact... so .Failed or . Success doesn't do anything different...

So if you have ideas please post on issues https://github.com/umbraco/Umbraco.Forms.Issues/issues/205

I think if you want to influence form submission (and show error messages) you need to hook into the event model

As posted above Heather Floyd created issue on which still is "Open". I use some api in workflow and want to show error on form if something wrong. Like hot fix (it's not good but works for me) i use: System.Web.HttpContext.Current.Response.AddHeader("isError", "true");

  public override WorkflowExecutionStatus Execute(Record record, RecordEventArgs e)
    {
        var model = new NewsLetterModel();
        var list = new List<FieldMapping>();

        if (!string.IsNullOrEmpty(Fields))
            list = JsonConvert.DeserializeObject<IEnumerable<FieldMapping>>(Fields).ToList();

        if (list.Any())
        {
            foreach (var fieldMapping in list)
            {
                try
                {
                    var alias = fieldMapping.Alias;

                    if (string.IsNullOrEmpty(fieldMapping.Alias))
                    {
                        continue;
                    }

                    var value = fieldMapping.StaticValue;

                    if (!string.IsNullOrEmpty(fieldMapping.Value))
                    {
                        value = string.IsNullOrEmpty(
                                record.RecordFields[new Guid(fieldMapping.Value)].ValuesAsString(false))
                                ? fieldMapping.StaticValue
                                : record.RecordFields[new Guid(fieldMapping.Value)].ValuesAsString(false);
                    }


                    var property = model.GetType().GetProperty(fieldMapping.Alias);

                    //LogHelper.Warn<ContactUsModel>($"Start name:{alias} value:{value}");
                    if (property == null)
                    {
                        //LogHelper.Warn<ContactUsModel>($"No property found {alias} ");
                        continue;
                    }
                    else
                    {
                        var t = Nullable.GetUnderlyingType(property.PropertyType) ?? property.PropertyType;
                        var safeValue = (value == null) ? null : Convert.ChangeType(value, t);
                        property.SetValue(model, safeValue, null);
                    }

                    var newsLetterService = DependencyResolver.Current.GetService<IMohEmailNewsLetterService>();
                    newsLetterService.CreateOrUpdateContact(model);

                    // TODO: remove it just for test!!!!
                    throw new Exception("Test");
                }
                catch (Exception exception)
                {
                    //LogHelper.Error<ContactUsModel>($"Workflow Mapping Error:{JsonConvert.SerializeObject(list)}", exception);
                    //return WorkflowExecutionStatus.Failed;

                    System.Web.HttpContext.Current.Response.AddHeader("isError", "true");

                   // throw;
                }
            }

I use ajax update for form:

function onSubmitNewsLetter(token) {
    $.ajax({
        url: $form.attr('action'),
        type: 'POST',
        cache: false,
        data: $form.serialize(),
        success: function (result, textStatus, request) {
            if (request.getResponseHeader('isError') == true) {
                var errorMessage = "call to tech service 5300";
                $('.subscribe-form .umbraco-forms-page').html(errorMessage);
            }
            else {
                $('.subscribe-form .umbraco-forms-page').addClass('success');
                var thankYouMessage = $(result).find('.newsletter-form-message').html();
                $('.subscribe-form .umbraco-forms-page').html(thankYouMessage);
            }
        }
    });
}

How did you get your form to use the ajax function?

is working on a reply...