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Stewart Lane
190
SelectedItems of a WebDropDown
posted

Hello,

I have a webform with a WebDropDown on it configured for checkbox multi-select based.  It functions fine when the web form is running (no javascript errors).  I am having difficulty accessing the selected items on server-side that were checked in the control.  

My aspx page markup is:

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="InfraTest.aspx.vb" Inherits="ReferralConnect.InfraTest" %>

<%@ Register assembly="Infragistics45.Web.v19.1, Version=19.1.20191.115, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb" namespace="Infragistics.Web.UI.ListControls" tagprefix="ig" %>

<!DOCTYPE html>

<html xmlns="">www.w3.org/.../xhtml">
<head runat="server">
<title></title>
</head>
<body>
<script type="text/javascript">

function selectedIndexChanging(sender, eventArgs) {
var oldItems = eventArgs.getOldSelection();
var newItems = eventArgs.getNewSelection();

var oldItemsString= "";
var newItemsString= "";

for (i = 0; i < oldItems.length; i++) {
if (oldItems[i] != null)
oldItemsString += oldItems[i].get_index() + ", ";
}

for (i = 0; i < newItems.length; i++)
newItemsString += newItems[i].get_index() + ", ";

addLine('<%= GetGlobalResourceObject("ddlServices", "MultiSelectionSelectionChanging") %>' + "(" + sender.get_name() + "): " + '<%= GetGlobalResourceObject("ddlServices", "MultiSelectionOldItems") %>' + " = [ " + oldItemsString + " ] ; " + '<%= GetGlobalResourceObject("ddlServices", "MultiSelectionNewItems") %>' + " = [ " + newItemsString + " ]; ");
}

function selectedIndexChanged(sender, eventArgs) {
var oldItems = eventArgs.getOldSelection();
var newItems = eventArgs.getNewSelection();

var oldItemsString= "";
var newItemsString= "";

for (i = 0; i < oldItems.length; i++) {
if (oldItems[i] != null)
oldItemsString += oldItems[i].get_index() + ", ";
}

for (i = 0; i < newItems.length; i++)
newItemsString += newItems[i].get_index() + ", ";

addLine('<%= GetGlobalResourceObject("ddlServices", "MultiSelectionSelectionChanged") %>'+
"(" + sender.get_name() + "): " + '<%= GetGlobalResourceObject("ddlServices", "MultiSelectionOldItems") %>' +
" = [ " + oldItemsString + " ] ; " + '<%= GetGlobalResourceObject("ddlServices", "MultiSelectionNewItems") %>' +
" = [ " + newItemsString + " ]; ");
}

</script>

<form id="form1" runat="server">
<div>
<%= GetGlobalResourceObject("ddlServices", "MultiSelectionCheckbox") %><br /><br /><ig:WebDropDown runat="server" ID="ddlServices" EnableClosingDropDownOnSelect="False" TextField="ServiceName" Width="400px" DropDownContainerHeight="300px" EnableMultipleSelection="True" Enabled="True" ViewStateMode="Inherit"><ClientEvents SelectionChanged="selectedIndexChanged" SelectionChanging="selectedIndexChanging" /></ig:WebDropDown>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>

<br />
<asp:Button ID="Button1" runat="server" Text="Button" />

</div>

</form>
</body>
</html>

My code behind (VB is):

Imports System
Imports System.Data
Imports System.Data.SqlClient
Imports System.Data.SqlTypes
Imports System.IO

Public Class InfraTest
Inherits System.Web.UI.Page

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
'Load Services into Dropdown.
  Dim SqlConnection1 As New SqlConnection(ConfigurationManager.ConnectionStrings("INSTANCE").ConnectionString) 
  Dim SQLString As String
  SQLString = "select ServiceName, ServiceID from ProviderServices where ProviderID = " + "'" + "1" + "'"
  SQLString = SQLString + " order by ServiceName"
  Dim dtSelected As DataTable

  Try
    Dim daSelected As SqlDataAdapter = New SqlDataAdapter(SQLString, SqlConnection1)
    dtSelected = New DataTable()
    daSelected.Fill(dtSelected)
    ddlServices.DataSource = dtSelected

  Catch ex As Exception
    Return
  End Try

End Sub

Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim S2 As String
S2 = ddlServices.SelectedItems(0).Text


Dim test As Integer
test = ddlServices.SelectedItems.Count

Dim wdd As Infragistics.Web.UI.ListControls.WebDropDown = DirectCast(Page.FindControl("ddlServices"), Infragistics.Web.UI.ListControls.WebDropDown)
Dim items As List(Of Infragistics.Web.UI.ListControls.DropDownItem) = wdd.SelectedItems
Dim cnt As Integer = 0
cnt = items.Count
Dim test1 As Integer
test1 = 0
End Sub
End Class

ddlServices.SelectedItems(0).Text throws an out of range exception even though some values in the dropdown list are checked.

ddlServices.SelectedItems.Count is equla to 0

The findcontrol method doesn't work eithor.

Perhaps I'm misunderstanding something.  I want to access the list of checked items so I can do some processing on them on the server side after a button is clicked.

My viewstate is enabled.

Any advice?

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  • 1980
    Offline posted

    Hi Stewart,

    I tried to reproduce the behavior you are describing and I created a simple project with the WebDropDown. My project uses NetAdvantage for .NET Version=19.1.20191.115. When clicking the button, it gets the selected items in the drop down.
    I have attached the sample project I used to test this. Please test this project on your PC; whether or not it works correctly may help indicate the nature of this problem.

    If the project does show the product feature working correctly, then more information will be needed to reproduce the issue in a sample that can be used for debugging. It will help if you can provide a small, isolated sample application that demonstrates the behavior you are seeing. This can be done by either making the sample that I provided more like your application or by isolating the behavior from your application by removing dependencies on any third parties or databases.

    Please let me know if I can provide any further assistance.

    WebDropDownSample.zip

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