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Client Script to set_value

3 Answers 272 Views

ComboBox

This is a migrated thread and some comments may be shown as answers.

Andy Ho asked on 28 Feb 2011, 04:48 AM

Hi,

I added a RadCombobox to a page with Datasource pointed to a LINQDataSource. Then I add a Javascript to set its value on load:

<script type="text/javascript">

var combox = $find("<%=dfDocuments.clientID %>");

combox.set_value('3');

</script>

It works fine, but then I add the following code to add a blank line to the Combobox:

Protected Sub dfDocuments_DataBound(ByVal sender As Object, ByVal e As System.EventArgs) Handles dfDocuments.DataBound

Dim li As New RadComboBoxItem

li.Value = "0"

li.Text = "--Select--"

li.Selected = False

dfDocuments.Items.Insert(0, li)

End Sub

Then the set_value script doesn't works anymore.

Any advice? Thanks.

Andy

3 Answers, 1 is accepted

answered on 07 Mar 2011, 02:20 AM

Kalina,

<body>

<form id="form1" runat="server"

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

</telerik:RadScriptManager

<telerik:RadComboBox ID="dfDocuments" runat="server" DataSourceID="ldsDocuments"

DataTextField="Subject" DataValueField="FileID" Width="250px">

</telerik:RadComboBox>

<asp:LinqDataSource ID="ldsDocuments" runat="server" ContextTypeName="dcLAPDataContext"

OrderBy="PageID" Select="new (FileID, Subject)" TableName="LAP_Files"></asp:LinqDataSource

</form>

<script type="text/javascript">

// Tried to set the defalut value to 3 with J

avascript

var combox = $find("<%=dfDocuments.clientID%>");

combox.set_value('3');

</script

</body></html>

My VB Code:

Partial Class Testing_ComboText

Inherits System.Web.UI.Page



Protected Sub dfDocuments_DataBound(ByVal sender As

Object, ByVal e As System.EventArgs) Handles

dfDocuments.DataBound

Dim li As

New RadComboBoxItem

li.Value =

"0"

li.Text =

"--Select--"

li.Selected = F

alse

'If I remark the line below, the Javascript works ok, otherwise

failed

dfDocuments.Items.Insert(0,

li)

End Sub

End Class

answered on 08 Mar 2011, 01:33 PM

Hello Andy Ho,

As I understand, you are trying to preselect an item in the RadComboBox.
Let me suggest you handle the OnClientLoad event or the RadComboBox in this way.

<telerik:RadComboBox runat="server" ID="dfDocuments"

DataSourceID="ldsDocuments" OnClientLoad="OnClientLoad"

...

<script type="text/javascript">

function OnClientLoad(sender)

{

var item = sender.findItemByValue('3');

item.select();

}

</script>

Kind regards,
Kalina
the Telerik team

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