/// <summary>
/// Renderize the dropdown.
/// </summary>
/// <param name="pHtml">The HTML.</param>
/// <param name="pName">The name.</param>
/// <param name="pValue">The value.</param>
/// <param name="pItems">The items.</param>
/// <param name="pAttributes">The styles.</param>
/// <returns></returns>
public static HtmlString RenderDropDown(this IHtmlHelper pHtml, string pName, object pValue, DropDownItems pItems, IDictionary <String, object> pAttributes = null)
{
var wControl = string.Empty;
var wAtributos = GetAttributes(pAttributes);
pItems?.SelectItem(pValue);
wControl += string.Format("<select id=\"{0}\" name=\"{0}\" {1}>\r\n", pName, wAtributos);
if (pItems != null)
{
var wGroups = from options in pItems where options.Group != null orderby options.Group descending group options by options.Group into groups select new { Group = groups.Key };
if (wGroups.Count() > 2)
{
foreach (var wGroup in (from options in wGroups where string.IsNullOrEmpty(options.Group) select options))
{
var wItemsGroups = from options in pItems where options.Group == wGroup.Group select options;
wControl = wItemsGroups.Aggregate(wControl, (current, oItem) => current + string.Format("\t<option value=\"{0}\"{2}>{1}</option>\r\n", oItem.Id,
oItem.Description, (oItem.Selected ? " selected=\"selected\"" : string.Empty)));
}
foreach (var wGroup in (from options in wGroups where !string.IsNullOrEmpty(options.Group) select options))
{
if (!string.IsNullOrEmpty(wGroup.Group))
{
wControl += string.Format("<optgroup label=\"{0}\">", wGroup.Group);
}
var wItemsGroups = from options in pItems where options.Group == wGroup.Group select options;
wControl = wItemsGroups.Aggregate(wControl, (current, oItem) => current + string.Format("\t<option value=\"{0}\"{2}>{1}</option>\r\n", oItem.Id,
oItem.Description, (oItem.Selected ? " selected=\"selected\"" : string.Empty)));
if (!string.IsNullOrEmpty(wGroup.Group))
{
wControl += "</optgroup>";
}
}
}
else
{
foreach (var oItem in pItems)
{
wControl += string.Format("\t<option value=\"{0}\"{2}>{1}</option>\r\n", oItem.Id, oItem.Description, (oItem.Selected ? " selected=\"selected\"" : string.Empty));
}
}
}
wControl += "</select>\r\n";
return(new HtmlString(wControl));
}