RadGrid Column.Display not actual

[Thomas]

Hi there,

I check the display-property of the columns of a RadGrid on PreRender, but it isn't actual.

If I Hide/Show another Column or sort a column, the PreRender Function gives the correct display-property.

Here my code:

<%

 

@

Page

Language

="VB"

AutoEventWireup

="false"

CodeBehind

="Default.aspx.vb"

Inherits

="TelerikWebAppHideUnhideColBug._Default"

%>

 

<%

 

 

@

Register

Assembly

="Telerik.Web.UI"

Namespace

="Telerik.Web.UI"

TagPrefix

="telerik"

%>

 

 

<!

 

 

DOCTYPE

html

PUBLIC

"-//W3C//DTD XHTML 1.0 Transitional//EN"

"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

 

 

<

 

 

html

xmlns

="http://www.w3.org/1999/xhtml">

 

<

 

 

 

head

id

="Head1"

runat

="server">

 

 

 

 

<

title

></

title

>

 

</

 

 

 

head

>

 

<

 

 

 

body

>

 

 

 

 

<

form

id

="form1"

runat

="server">

 

 

 

 

<

script

type

="text/javascript">

 

 

 

 

function

RadGridCSC_ColumnHidden(sender, args) {

 

$find(

 

 

"<%= RadAjaxManager1.ClientID %>"

).ajaxRequest(

"ColumnHidden"

);

 

}

 

 

 

function

RadGridCSC_ColumnShown(sender, args) {

 

$find(

 

 

"<%= RadAjaxManager1.ClientID %>"

).ajaxRequest(

"ColumnShown"

);

 

}

 

 

 

function

RadGridCSC_ColumnRezised(sender, args) {

 

$find(

 

 

"<%= RadAjaxManager1.ClientID %>"

).ajaxRequest(

"ColumnRezised"

);

 

}

 

 

 

</

script

>

 

 

 

 

<

telerik

:

RadAjaxManager

ID

="RadAjaxManager1"

runat

="server">

 

 

 

 

</

telerik

:

RadAjaxManager

>

 

 

 

 

 

<

telerik

:

RadScriptManager

ID

="RadScriptManager1"

runat

="server"></

telerik

:

RadScriptManager

>

 

 

 

 

 

<

div

>

 

 

 

 

<

telerik

:

RadGrid

ID

="RadGrid1"

runat

="server"

AllowFilteringByColumn

="True"

 

 

 

 

AllowPaging

="True"

PageSize

="50"

Width

="100%"

Height

="650"

AllowSorting

="True"

CellSpacing

="0"

 

 

 

 

EnableHeaderContextMenu

="true"

EnableHeaderContextFilterMenu

="true">

 

 

 

 

 

<

GroupingSettings

CaseSensitive

="false"></

GroupingSettings

>

 

 

 

 

<

MasterTableView

AutoGenerateColumns

="false"

AllowFilteringByColumn

="True"

CommandItemDisplay

="Top"

width

="100%"

ClientDataKeyNames

="ProductID">

 

 

 

 

<

PagerStyle

AlwaysVisible

="true"

Mode

="NextPrevAndNumeric"

/>

 

 

 

 

<

Columns

>

 

 

 

 

<

telerik

:

GridBoundColumn

DataField

="ProductID"

Visible

="true"

FilterControlWidth

="60%"

HeaderStyle-Width

="80"

ItemStyle-Width

="60"

HeaderText

="ProductID"

UniqueName

="Version2"

ColumnGroupName

="SoftwareInformation"

ItemStyle-HorizontalAlign

="Left"

HeaderStyle-HorizontalAlign

="Left"

/>

 

 

 

 

<

telerik

:

GridBoundColumn

DataField

="ProductName"

Visible

="true"

FilterControlWidth

="80%"

HeaderStyle-Width

="200"

ItemStyle-Width

="200"

HeaderText

="Product Name"

UniqueName

="ProductName"

ColumnGroupName

="SoftwareInformation"

ItemStyle-HorizontalAlign

="Left"

HeaderStyle-HorizontalAlign

="Left"

/>

 

 

 

 

<

telerik

:

GridBoundColumn

DataField

="UnitPrice"

 

 

 

 

Visible

="true"

DataType

="System.String"

FilterListOptions

="VaryByDataType"

 

 

 

 

FilterControlWidth

="80%"

HeaderStyle-Width

="270"

ItemStyle-Width

="270"

 

 

 

 

HeaderText

="UnitPrice"

 

 

 

 

UniqueName

="UnitPrice"

ColumnGroupName

="SoftwareInformation"

 

 

 

 

ItemStyle-HorizontalAlign

="Left"

HeaderStyle-HorizontalAlign

="Left"/>

 

 

 

 

<

telerik

:

GridBoundColumn

DataField

="ReorderLevel"

Visible

="true"

FilterControlWidth

="60%"

HeaderStyle-Width

="80"

ItemStyle-Width

="60"

HeaderText

="ReorderLevel"

UniqueName

="ReorderLevel"

ColumnGroupName

="SoftwareInformation"

ItemStyle-HorizontalAlign

="Left"

HeaderStyle-HorizontalAlign

="Left"

/>

 

 

 

 

<

telerik

:

GridBoundColumn

DataField

="Discontinued"

Visible

="true"

FilterControlWidth

="80%"

HeaderStyle-Width

="200"

ItemStyle-Width

="200"

HeaderText

="Discontinued"

UniqueName

="Discontinued"

ColumnGroupName

="SoftwareInformation"

ItemStyle-HorizontalAlign

="Left"

HeaderStyle-HorizontalAlign

="Left"

/>

 

 

 

 

</

Columns

>

 

 

 

 

</

MasterTableView

>

 

 

　

 

 

<

ClientSettings

AllowColumnsReorder

="true"

ReorderColumnsOnClient

="false">

 

 

 

 

<

DataBinding

Location

="http://demos.kendoui.com/service/Northwind.svc"

ResponseType

="JSONP">

 

 

 

 

<

DataService

TableName

="Products"

Type

="OData"

/>

 

 

 

 

</

DataBinding

>

 

 

 

 

<

Scrolling

 

 

 

 

AllowScroll

="true"

 

 

 

 

UseStaticHeaders

="true"

 

 

 

 

ScrollHeight

="300px"

/>

 

 

 

 

<

ClientEvents

OnColumnShowing

="RadGridCSC_ColumnShown"

OnColumnHidden

="RadGridCSC_ColumnHidden"

/>

 

 

 

 

</

ClientSettings

>

 

 

 

 

</

telerik

:

RadGrid

>

 

 

 

 

</

div

>

 

 

 

 

</

form

>

 

</

 

 

 

body

>

 

</​

 

 

 

html

>

 

​

Imports

 

 

Telerik.Web.UI

 

 

Partial

 

 

Class

_Default

 

 

 

 

Inherits

System.Web.UI.

Page

 

 

 

 

Private

Sub

RadGrid1_PreRender(sender

As

Object

, e

As

System.

EventArgs

)

Handles

RadGrid1.PreRender

 

 

 

 

Dim

col

As

Telerik.Web.UI.

GridBoundColumn

 

 

col = RadGrid1.Columns.FindByUniqueName(

 

"Version2"

)

 

 

 

 

Debug

.Print(col.UniqueName +

":"

+ col.di.Display.ToString)

 

 

 

 

End

Sub

 

End

 

 

 

Class​

 

 

 

​​​​​​​
If I toogle the hide/show a column the Output are:

Version2:True

Version2:False

Version2:False

Version2:False

Version2:False

Version2:False

How can I get the actual display of a Column?

Thanks
Thomas

[Princy]

Hi Thomas,

Its hard to read your code. Please attach the code again using the Format Code Block, from the formatting options and elaborate on your requirement.
If you are trying to set the visible property of a column, please try the following code snippet.

VB:

RadGrid1.Columns.FindByUniqueName("ColumnUniqueName").Visible = True
'OR
RadGrid1.MasterTableView.GetColumn("ColumnUniqueName").Visible = True

Thanks,
Princy

[Thomas]

<%@ Page Language="VB" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="TelerikWebAppHideUnhideColBug._Default" %>

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

  

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

  

<html xmlns="http://www.w3.org/1999/xhtml">

<head id="Head1" runat="server">

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

        <script type="text/javascript">

            function RadGridCSC_ColumnHidden(sender, args) {

                $find("<%= RadAjaxManager1.ClientID %>").ajaxRequest("ColumnHidden");

            }

            function RadGridCSC_ColumnShown(sender, args) {

                $find("<%= RadAjaxManager1.ClientID %>").ajaxRequest("ColumnShown");

            }

            function RadGridCSC_ColumnRezised(sender, args) {

                $find("<%= RadAjaxManager1.ClientID %>").ajaxRequest("ColumnRezised");

            }

        </script>

  

        <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">        

        </telerik:RadAjaxManager>

      

    <telerik:RadScriptManager ID="RadScriptManager1" runat="server"></telerik:RadScriptManager>

      

    <div>

    <telerik:RadGrid ID="RadGrid1" runat="server" AllowFilteringByColumn="True"  

        AllowPaging="True" PageSize="50"  Width="100%" Height="650" AllowSorting="True" CellSpacing="0" 

        EnableHeaderContextMenu="true" EnableHeaderContextFilterMenu="true">

          

        <GroupingSettings CaseSensitive="false"></GroupingSettings>

        <MasterTableView AutoGenerateColumns="false" AllowFilteringByColumn="True" CommandItemDisplay="Top" width="100%" ClientDataKeyNames="ProductID">

  

            <PagerStyle AlwaysVisible="true" Mode="NextPrevAndNumeric" />

            <Columns>

                <telerik:GridBoundColumn DataField="ProductID" Visible="true" FilterControlWidth="60%"  HeaderStyle-Width="80" ItemStyle-Width="60" HeaderText="ProductID" UniqueName="Version2" ColumnGroupName="SoftwareInformation" ItemStyle-HorizontalAlign="Left" HeaderStyle-HorizontalAlign="Left" /> 

                <telerik:GridBoundColumn DataField="ProductName" Visible="true" FilterControlWidth="80%" HeaderStyle-Width="200" ItemStyle-Width="200"  HeaderText="Product Name" UniqueName="ProductName" ColumnGroupName="SoftwareInformation" ItemStyle-HorizontalAlign="Left" HeaderStyle-HorizontalAlign="Left" />

                <telerik:GridBoundColumn DataField="UnitPrice" 

                                        Visible="true" DataType="System.String" FilterListOptions="VaryByDataType" 

                                        FilterControlWidth="80%" HeaderStyle-Width="270" ItemStyle-Width="270"  

                                        HeaderText="UnitPrice" 

                                        UniqueName="UnitPrice" ColumnGroupName="SoftwareInformation" 

                                        ItemStyle-HorizontalAlign="Left" HeaderStyle-HorizontalAlign="Left"/> 

                <telerik:GridBoundColumn DataField="ReorderLevel" Visible="true" FilterControlWidth="60%"  HeaderStyle-Width="80" ItemStyle-Width="60" HeaderText="ReorderLevel" UniqueName="ReorderLevel" ColumnGroupName="SoftwareInformation" ItemStyle-HorizontalAlign="Left" HeaderStyle-HorizontalAlign="Left" /> 

                <telerik:GridBoundColumn DataField="Discontinued" Visible="true" FilterControlWidth="80%"  HeaderStyle-Width="200" ItemStyle-Width="200" HeaderText="Discontinued" UniqueName="Discontinued" ColumnGroupName="SoftwareInformation"  ItemStyle-HorizontalAlign="Left" HeaderStyle-HorizontalAlign="Left" /> 

            </Columns>

        </MasterTableView>

  

  

        <ClientSettings AllowColumnsReorder="true" ReorderColumnsOnClient="false">

             <DataBinding Location="http://demos.kendoui.com/service/Northwind.svc" ResponseType="JSONP">

                    <DataService TableName="Products" Type="OData" />

                </DataBinding>                

            <Scrolling 

            AllowScroll="true" 

            UseStaticHeaders="true" 

            ScrollHeight="300px" />         

            <ClientEvents OnColumnShowing="RadGridCSC_ColumnShown" OnColumnHidden="RadGridCSC_ColumnHidden" />

        </ClientSettings>

    </telerik:RadGrid>

  

    </div>

    </form>

</body>

</html>


Imports Telerik.Web.UI

Partial Class _Default
    Inherits System.Web.UI.Page

    Private Sub RadGrid1_PreRender(sender As Object, e As System.EventArgs) Handles RadGrid1.PreRender
        Dim col As Telerik.Web.UI.GridBoundColumn
        col = RadGrid1.Columns.FindByUniqueName("Version2")
        Debug.Print(col.UniqueName + ":" + col.Display.ToString)
    End Sub
End Class

[Thomas]

I don't want to set the visible of a column, I want to know if the user hide/unhide a column and if the column is now hidden or not.

[Princy]

Hi Thomas,

The context menu options hide the columns on client-side. Take a look at the below sample code where I demonstrated how to raise a server event on column hiding or showing.

ASPX:

<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" OnAjaxRequest="RadAjaxManager1_AjaxRequest">
</telerik:RadAjaxManager>
<telerik:RadCodeBlock ID="RadCodeBlock1" runat="server">
    <script type="text/javascript">
        function columnDisplayChanged(sender, args) {
            var colUniqueName = args.get_gridColumn().get_uniqueName();
            $find("<%= RadAjaxManager1.ClientID %>").ajaxRequest(colUniqueName + "display");
        }
    </script>
</telerik:RadCodeBlock>
<telerik:RadGrid ID="RadGrid1" runat="server" EnableHeaderContextMenu="true" AllowPaging="true">
    <MasterTableView >
        <Columns>
           . . . . . .
        </Columns>
    </MasterTableView>
    <ClientSettings>
        <ClientEvents OnColumnHidden="columnDisplayChanged" OnColumnShown="columnDisplayChanged" />
    </ClientSettings>
</telerik:RadGrid>

C#:

protected void RadAjaxManager1_AjaxRequest(object sender, AjaxRequestEventArgs e)
{
  if (e.Argument.IndexOf("display") != -1)
  {
    string colUniqueName = e.Argument.Substring(0, e.Argument.IndexOf("display"));
    GridColumn hiddenColumn = RadGrid1.MasterTableView.GetColumnSafe(colUniqueName) as GridColumn;
    RadAjaxManager1.Alert(colUniqueName + " display - " + hiddenColumn.Display);
  }
}

Thanks,
Princy

[Thomas]

Thanks for the reply

I have the same Problem with your code. The .display is ever false (hidden or not).

[Viktor Tachev]

Hi Thomas,

Would you elaborate more on what you would like to achieve in the scenario you are implementing? What are your requirements and what should be the expected result?

Please note that if you would like to persist the RadGrid settings with RadPersistenceFramework you need to use server-side binding. When client-side binding is used for RadGrid, persisting its settings with RadPersistanceManager is not supported.


Regards,
Viktor Tachev
Telerik