Hello,
I have an application which uses RadAjaxManager to populate RadComboBoxes as users make selections on the page. This works correctly most of the time however roughly 10% of the time the user will make a selection from combo box 1 which is supposed to populate combo box 2, the Ajax request seems to fire but it loads no values in combo box 2.
I have tested and the error is definitely not related to the data. I can test using the exact same data that was used by someone who encountered the error and combo box 2 will load correctly for me.
Here are the Ajax settings for Combo Box 1:
Here is the markup for combo boxes 1 & 2:
Here is the associated code behind function:
Everything here seems fairly simple so I am having a really hard time understanding why my users are encountering this issue. The fact that it is so hard to replicate has also made this extremely difficult to troubleshoot. Any help at all would be appreciated.
Thank you!
EDIT: Some further information... When the issue happens it seems to persist for a few minutes. All AJAX calls seem to fail but no error is displayed and nothing is reported to the event logs on the web server. After a few minutes and a browser restart everything works fine once again.
I have an application which uses RadAjaxManager to populate RadComboBoxes as users make selections on the page. This works correctly most of the time however roughly 10% of the time the user will make a selection from combo box 1 which is supposed to populate combo box 2, the Ajax request seems to fire but it loads no values in combo box 2.
I have tested and the error is definitely not related to the data. I can test using the exact same data that was used by someone who encountered the error and combo box 2 will load correctly for me.
Here are the Ajax settings for Combo Box 1:
<
telerik:AjaxSetting
AjaxControlID
=
"rcmbMarket"
>
<
UpdatedControls
>
<
telerik:AjaxUpdatedControl
ControlID
=
"rcmbApplicationField"
LoadingPanelID
=
"RadAjaxLoadingPanel1"
/>
<
telerik:AjaxUpdatedControl
ControlID
=
"ApplicationFieldSource"
LoadingPanelID
=
"RadAjaxLoadingPanel1"
/>
</
UpdatedControls
>
</
telerik:AjaxSetting
>
Here is the markup for combo boxes 1 & 2:
<
asp:TableRow
HorizontalAlign
=
"Center"
ID
=
"ProductRow3"
>
<
asp:TableCell
Width
=
"25%"
HorizontalAlign
=
"Left"
ID
=
"MarketLabelCell"
>
<
asp:Label
ID
=
"lblMarket"
runat
=
"server"
Text
=
"Market: "
></
asp:Label
>
<
asp:RequiredFieldValidator
ID
=
"vldMarket"
runat
=
"server"
ControlToValidate
=
"rcmbMarket"
ErrorMessage
=
"*"
ForeColor
=
"Red"
SetFocusOnError
=
"true"
ValidationGroup
=
"grpMain"
></
asp:RequiredFieldValidator
>
</
asp:TableCell
>
<
asp:TableCell
Width
=
"25%"
HorizontalAlign
=
"Left"
ID
=
"MarketDDLCell"
>
<
telerik:RadComboBox
ID
=
"rcmbMarket"
runat
=
"server"
AllowCustomText
=
"false"
DataSourceID
=
"MarketSource"
AutoPostBack
=
"true"
CausesValidation
=
"false"
DataTextField
=
"MarketDesc"
DataValueField
=
"pkMarketID"
AppendDataBoundItems
=
"true"
OnSelectedIndexChanged
=
"Market_Check"
>
<
Items
>
<
telerik:RadComboBoxItem
Text
=
""
Value
=
""
/>
</
Items
>
</
telerik:RadComboBox
>
<
asp:SqlDataSource
ID
=
"MarketSource"
runat
=
"server"
ConnectionString="<%$ ConnectionStrings:QuoteProdConn %>" SelectCommand="SELECT pkMarketID, MarketDesc FROM Data.Market WHERE Active = 'True' ORDER BY MarketDesc ASC"></
asp:SqlDataSource
>
</
asp:TableCell
>
<
asp:TableCell
Width
=
"25%"
HorizontalAlign
=
"Left"
ID
=
"ApplicationLabelCell"
>
<
asp:Label
ID
=
"lblApplicationField"
runat
=
"server"
Text
=
"Application Field:"
></
asp:Label
>
<
asp:RequiredFieldValidator
ID
=
"vldAppField"
runat
=
"server"
ControlToValidate
=
"rcmbApplicationField"
ErrorMessage
=
"*"
ForeColor
=
"Red"
SetFocusOnError
=
"true"
ValidationGroup
=
"grpMain"
></
asp:RequiredFieldValidator
>
</
asp:TableCell
>
<
asp:TableCell
Width
=
"25%"
HorizontalAlign
=
"Left"
ID
=
"ApplicationTextCell"
>
<
telerik:RadComboBox
ID
=
"rcmbApplicationField"
runat
=
"server"
AllowCustomText
=
"false"
DataSourceID
=
"ApplicationFieldSource"
ExpandDirection
=
"Down"
AutoPostBack
=
"true"
DataTextField
=
"AppDescription"
DataValueField
=
"pkAppFieldID"
AppendDataBoundItems
=
"true"
CausesValidation
=
"false"
MaxHeight
=
"300px"
>
<
Items
>
<
telerik:RadComboBoxItem
Text
=
""
Value
=
""
/>
</
Items
>
</
telerik:RadComboBox
>
<
asp:SqlDataSource
ID
=
"ApplicationFieldSource"
runat
=
"server"
ConnectionString="<%$ ConnectionStrings:QuoteProdConn %>"></
asp:SqlDataSource
>
</
asp:TableCell
>
</
asp:TableRow
>
Here is the associated code behind function:
Protected
Sub
Market_Check(
ByVal
sender
As
Object
,
ByVal
e
As
System.EventArgs)
Dim
tmpItem
As
New
Telerik.Web.UI.RadComboBoxItem(
""
,
""
)
ApplicationFieldSource.SelectCommand =
"SELECT pkAppFieldID, AppDescription FROM Data.ApplicationField WHERE Active = 'True' AND fkMarketID = "
& rcmbMarket.SelectedValue.ToString() &
" ORDER BY AppDescription ASC "
ApplicationFieldSource.DataBind()
rcmbApplicationField.Items.Clear()
rcmbApplicationField.Items.Add(tmpItem)
rcmbApplicationField.DataBind()
End
Sub
Everything here seems fairly simple so I am having a really hard time understanding why my users are encountering this issue. The fact that it is so hard to replicate has also made this extremely difficult to troubleshoot. Any help at all would be appreciated.
Thank you!
EDIT: Some further information... When the issue happens it seems to persist for a few minutes. All AJAX calls seem to fail but no error is displayed and nothing is reported to the event logs on the web server. After a few minutes and a browser restart everything works fine once again.