[Solved] Using TreeView in Html helper extension

[Tx3]

Hi,

I noticed that my View was getting too complicated and I created my own html helper where I am using Telerik TreeView. Everything works like earlier, but I have problems understanding how Content works. Earlier I had:

<%
    Html.Telerik().Grid<AttributeRow>()
        .Name("Attributes")
        .BindTo(Model.Rows)
        .Columns(columns =>
        {
            columns.Add(o => { %>
                <%= ParameterHelper.GetFamilyIndicator(o.IsFromFamily) %>
                <%= Html.Hidden("AttributeId", o.AttributeId.ToString(), AttributeGridHelper.OtherColumnsHtmlAttributes(o.IsFromFamily, o.AttributeScope))%>
                <%= Html.Hidden("AttributeName", o.Name, AttributeGridHelper.OtherColumnsHtmlAttributes(o.IsFromFamily, o.AttributeScope))%>
                <%= Html.Hidden("AttributeValueId", o.AttributeValueId.ToString(), AttributeGridHelper.OtherColumnsHtmlAttributes(o.IsFromFamily, o.AttributeScope))%>
                <%= Html.Hidden("AttributeTypeId", (int)o.AttributeTypeId, AttributeGridHelper.OtherColumnsHtmlAttributes(o.IsFromFamily, o.AttributeScope))%>
                <% }).HtmlAttributes(new {style = "width:1px;"});
            columns.Add(o => o.Name).Title("Name");

and I was able to have visible data and also those hidden fields. I converted this to following helper:

        public static MvcHtmlString AttributeEditor<TModel>(this HtmlHelper<TModel> htmlHelper, ParameterCreateViewModel model, string url)
        {
            string tmp = string.Empty;
            htmlHelper.Telerik().Grid<AttributeRow>()
                .Name("Attributes")
                .BindTo(model.Rows)
                .Columns(columns =>
                {
                    columns.Add(o => {
                        ParameterHelper.GetFamilyIndicator(o.IsFromFamily);
                        htmlHelper.Hidden("AttributeId", o.AttributeId.ToString(), AttributeGridHelper.OtherColumnsHtmlAttributes(o.IsFromFamily, o.AttributeScope)).ToString();
                        htmlHelper.Hidden("AttributeName", o.Name, AttributeGridHelper.OtherColumnsHtmlAttributes(o.IsFromFamily, o.AttributeScope)).ToString();
                        htmlHelper.Hidden("AttributeValueId", o.AttributeValueId.ToString(), AttributeGridHelper.OtherColumnsHtmlAttributes(o.IsFromFamily, o.AttributeScope)).ToString();
                        htmlHelper.Hidden("AttributeTypeId", (int)o.AttributeTypeId, AttributeGridHelper.OtherColumnsHtmlAttributes(o.IsFromFamily, o.AttributeScope)).ToString();
                    }).HtmlAttributes(new {style = "width:1px;"});
                    columns.Add(o => o.Name).Title("Name");

My problem is that I always get the first line which is the ParameterHelper.GetFamilyIndicator... How can I get same results like in the original implementation?

Another question.. Even if I return string.Empty from my helper still TreeView is rendered. Is Render method responsible for that. What kind of magic have you used? :)

-Tatu

[Atanas Korchev]

Hello Tx3,

The provide code snippets do not indicate the reason for the erroneous behavior. I suggest you open a support ticket and attach a simple project showing the problem you are facing.

The other option is to try using the provided source code and use the debugger to peek into the executed code.

Regards,
Atanas Korchev
the Telerik team