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Image won't display on selection

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DropDownList
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Johnathan
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Johnathan asked on 08 Oct 2015, 09:00 PM

Hello. I'm working with a raddropdownlist control contained within radfilter and I have this drop down list display images for different each list item. The ImageDropDown image shows you what the display looks like when the drop down list is open. If I select a drop down list item, the item get selected but nothing displays (shown in the MissingSelection Image). However, once I apply the radfilter selection, the image will appear selected on postback (ImageSelected Image). Here's the code-behind code that is used to create the raddropdownlist for the radfilter:

Protected Sub RadFilter1_ExpressionItemCreated(sender As Object, e As RadFilterExpressionItemCreatedEventArgs) Handles RadFilter1.ExpressionItemCreated
        Dim oConn As New System.Data.SqlClient.SqlConnection(ConfigurationManager.ConnectionStrings("iTask").ConnectionString)
        Dim oCmd As New SqlCommand
        Dim oData As SqlDataReader

        Try
            Dim singleItem As RadFilterSingleExpressionItem = TryCast(e.Item, RadFilterSingleExpressionItem)
            If singleItem IsNot Nothing AndAlso singleItem.FieldName = "Flag" AndAlso singleItem.IsSingleValue Then
                Dim dropDownList As RadDropDownList = TryCast(singleItem.InputControl, RadDropDownList)
                oConn.Open()

                With dropDownList
                    .Width = 50
                    Dim oBlankItem As New DropDownListItem("")
                    .Items.Add(oBlankItem)
                    With oCmd
                        .Parameters.Clear()
                        .Connection = oConn
                        .CommandType = CommandType.StoredProcedure
                        .CommandText = "iTask_Select_Flags"
                    End With
                    oData = oCmd.ExecuteReader
                    Do While oData.Read
                        Dim oItem As New DropDownListItem("")
                        oItem.Text = "<img src='" & CoreComponents.sImageRoot & oData("ImageFileName").ToString & "' style='cursor:pointer;' border='0'/>"
                        oItem.ToolTip = oData("Name").ToString
                        oItem.Value = oData("ImageFileName").ToString
                        'oItem.ImageUrl = CoreComponents.sImageRoot & oData("ImageFileName").ToString
                        .Items.Add(oItem)
                    Loop
                    .OnClientItemSelected = "OnClientItemSelected"
                    '.OnClientSelectedIndexChanged = "OnClientSelectedIndexChanged"
                    .DataBind()
                    oData.Close()

                End With
            End If
        Catch ex As Exception
        Finally
            oConn.Dispose()
            oConn = Nothing
            oCmd = Nothing
            oData = Nothing
        End Try

    End Sub

 

I attempted to use the OnClientItemSelected & OnClientSelectedIndexChanged JS code to set the image in the text element of the RadDownDownList control, but to no avail. Here's that code as well. Any help on this issue would be greatly appreciated.

 function OnClientItemSelected(sender, eventArgs) {
                    alert('function called!');
                    var item = eventArgs.get_item();
                    //alert("You selected " + item.get_text() + " with value " + item.get_value());
                    sender.get_textElement().innerHTML = "<img src='<%=CoreComponents.sImageRoot%>" + item.get_value() + "' border='0'/>";
                }

                function OnClientSelectedIndexChanged(sender, eventArgs) {
                    alert("You selected item with index : " + eventArgs.get_index());
                    sender.get_textElement().innerHTML = sender.get_items().getItem(eventArgs.get_index()).get_text();
                }

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Nencho
Telerik team
answered on 13 Oct 2015, 02:16 PM
Hello Johnathan,

I am afraid that appending the ImageUrl in the textElement of the control is not supported, because the RadDropDownList manages only the text of the element.

Regards,
Nencho
Telerik
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Johnathan
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Nencho
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