/// <summary>
/// It builds a form tag that POSTS an Step Event of a Flow
/// </summary>
/// <typeparam name="TFlowType"></typeparam>
/// <param name="html"></param>
/// <param name="model"></param>
/// <param name="htmlId"></param>
/// <param name="queryString"></param>
/// <param name="className"></param>
/// <param name="defaultEvent"></param>
/// <returns></returns>
public static async Task <MvcForm> BeginUiFlowFormAsync(this IHtmlHelper html,
IUiFlowScreenModel model, string htmlId = "", object queryString = null, string className = "",
ScreenEvent defaultEvent = null)
{
var flowType = model.GetFlowType();
var concreteModel = (UiFlowScreenModel)model;
MvcForm result;
var flowName = flowType.ToString();
var routeValues = (object)new { flowType = flowName };
if (queryString != null)
{
routeValues = routeValues.MergeObjects(queryString);
}
var controllerName = string.IsNullOrEmpty(concreteModel.Metadata.ContainerController)
? flowName
: concreteModel.Metadata.ContainerController;
result = html.BeginForm(nameof(IUiFlowController.OnEvent), controllerName, routeValues, FormMethod.Post,
true,
htmlAttributes: new { @id = $"{flowName}-{htmlId}", @class = className });
var content = html.ViewContext.FormContext.EndOfFormContent;
var contentItems = new List <Task <HtmlString> >();
if (defaultEvent != null)
{
content.Add(html.Hidden(SharedSymbol.FlowEventFormFieldName, defaultEvent));
}
contentItems.Add(html.SecureHiddenAsync(UiFlowController.FlowFormKey, false,
Guid.NewGuid().ToString()));
contentItems.Add(
html.SecureHiddenAsync(nameof(UiFlowScreenModel.FlowHandler), false, model.FlowHandler));
contentItems.Add(html.SecureHiddenAsync(nameof(UiFlowScreenModel.FlowScreenName), false,
model.FlowScreenName));
contentItems.Add(html.SecureHiddenAsync(nameof(UiFlowScreenModel.ScreenTitle), false,
model.ScreenTitle));
foreach (var modelContainerProperty in concreteModel.Metadata.ContainerProperties)
{
if (modelContainerProperty.Value is string value)
{
contentItems.Add(html.SecureHiddenAsync(modelContainerProperty.Key, false, value));
}
}
foreach (var contentItem in contentItems)
{
content.Add(await contentItem);
}
return(result);
}