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07.19.2008 at 10:09AM PDT, ID: 23579221
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9.3

listbox value not passing using AJAX and web services

Asked by dobbinjp in Asynchronous Javascript and XML (AJAX), Programming for ASP.NET, Web Services and WCF

Tags:

I have a page with 2 listboxes, one contains counties and the other should contain interstates (that run through the selected county). The county listbox is populated by a web service and I want to use the selected county value to select routes from another web service.

I must be missing something simple, because I cannot get the selected county value. I am not using master pages, the county listbox is a trigger for the route listbox inside an update panel and I have a script manager on the page.

The route listbox is populated by the web service if I hard code a county number in the code. This population occurs on selectedindexchanged for the county listbox...any ideas what I may be missing?

The web service is at http://transp2.vuse.vanderbilt.edu/webservices/service.asmx and the functions are getcounty and getroute (pass getroute a county number of 19 to see it in action).Start Free Trial 
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aspx page code below:
 
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <div>
        <table>
            <tr>
                <td>
                    <asp:ListBox ID="ListBox1" runat="server" Height="300px" Width="169px" 
                        AutoPostBack="True"></asp:ListBox>
                </td>
                <td>
                    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
                        <ContentTemplate>
                        <asp:ListBox ID="ListBox2" runat="server" AutoPostBack="true" Height="120px" 
                        Width="169px"></asp:ListBox>
                        </ContentTemplate>
                        <Triggers>
                            <asp:AsyncPostBackTrigger ControlID="ListBox1" EventName="SelectedIndexChanged" />
                        </Triggers>
                    </asp:UpdatePanel>
                </td>
            </tr>
        </table>
    </div>
    </form>
</body>
 
my code-behind data is below:
 
    Protected Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
 
        MsgBox(ListBox1.SelectedValue.ToString) 'this returns an empty message box
 
        Dim loadroutes As New edu.vanderbilt.vuse.transp2.Service
        'ListBox2.DataSource = loadroutes.GetRoute(CInt(ListBox1.SelectedValue.ToString)) 'this does not work
        ListBox2.DataSource = loadroutes.GetRoute(19) 'hard-coded county number works
        ListBox2.DataTextField = "ROUTE_NAME"
        ListBox2.DataValueField = "NBR_RTE"
        ListBox2.DataBind()
 
    End Sub
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
 
        Dim loadcounties As New edu.vanderbilt.vuse.transp2.Service
        ListBox1.DataSource = loadcounties.GetCounty
        ListBox1.DataTextField = "CO_NAME"
        ListBox1.DataValueField = "NBR_TENN_C"
        ListBox1.DataBind()
 
    End Sub
 
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[+][-]07.20.2008 at 11:49AM PDT, ID: 22046558

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About this solution

Zones: Asynchronous Javascript and XML (AJAX), Programming for ASP.NET, Web Services and WCF
Tags: ASP.NET AJAX
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Solution Provided By: Bane83
Participating Experts: 1
Solution Grade: A
 
 
 
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