/// <summary>
/// Render the start of a basic flow form field with specified HTML for the label and element placeholders.
/// </summary>
/// <remarks>
/// Will render the end of the field after Dispose() is called.<br />
/// Usually, you would use this within a using block and then use the returned section to output nested fields, e.g.:<br />
/// using (var ss = s.BeginField("MyLabel", new HtmlString("MyElement")) {<br />
///     @ss.Field(...)<br />
/// }
/// </remarks>
/// <param name="expression">m => m.BooleanPropertyFromPageModel</param>
/// <param name="label">The label to add after the checkbox element</param>
/// <param name="fieldConfiguration">Configuration data for the field</param>
/// <param name="sectionId">Adds an id to the <dl> of the nested section</param>
/// <returns>A FlowFormSection object that will be nested within this field and can be used to create nested fields</returns>
public FlowFormSection <TModel> BeginFieldFor(Expression <Func <TModel, bool> > expression, string label, FieldConfiguration fieldConfiguration = null, string sectionId = null)
{
fieldConfiguration = fieldConfiguration ?? new FieldConfiguration();
var elementHtml = _htmlHelper.CheckBoxFor(expression, fieldConfiguration.HtmlAttributes).ToHtmlString() +
_htmlHelper.LabelFor(expression, label);
string errorHtml;
var isValid = GetErrors(expression, out errorHtml);
var field = new FlowFormField(_writer, true, LabelHtml(expression, fieldConfiguration), elementHtml, errorHtml, isValid, fieldConfiguration.Hint, fieldConfiguration.Tip, fieldConfiguration.HideTip, fieldConfiguration.HintClass, fieldConfiguration.ParentClass, fieldConfiguration.DisplayFieldName);
return(new FlowFormSection <TModel>(_htmlHelper, true, null, sectionId, parentField: field));
}
public FlowFormSection(HtmlHelper <TModel> htmlHelper, bool nested, string heading, string id = null, IHtmlString hint = null, string hintClass = null, bool optional = false, IHtmlString instructions = null, bool omitDl = false, FlowFormField parentField = null)
{
// Starts a section in a flow form
// The instance variables allow the form to maintain state for child sections and fields
// and to allow the writer to accumulate the output for the section
_htmlHelper = htmlHelper;
_nested = nested;
_omitDl = omitDl;
_parentField = parentField;
_writer = htmlHelper.ViewContext.Writer;
// Generate the html for the beginning of the section from the class compiled from the Razor template
var generatedSection = HelperDefinitions.BeginSection(nested, heading, id, hint, hintClass, optional, instructions, omitDl, HasParent);
_writer.Write(generatedSection.ToHtmlString());
}