Question

listbox selectedindexchanged does not fire up

Asked by: brillox

I am trying to get a listbox value  in this way

Partial Class Admin_DocumentManager
    Inherits System.Web.UI.Page

    Private ImageName As String
    Private DocumentName As String

'populate listboxes
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        If Not Page.IsPostBack Then
            Me.ListBoxDoc.DataSource = Getfiles(Request.PhysicalApplicationPath & "Documents/")
            Me.ListBoxDoc.DataBind()

            Me.ListBoxImages.DataSource = Getfiles(Request.PhysicalApplicationPath & "Images/Uploaded/")
            Me.ListBoxImages.DataBind()
        End If
    End Sub

'get the selecteditem vlaue
  Protected Sub ListBoxImages_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBoxImages.SelectedIndexChanged
        ImageName = ListBoxDoc.SelectedValue.ToString
    End Sub

###this is the problem

 Protected Sub ButtonLoadImageUrl_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles ButtonLoadImageUrl.Click

        If ImageName <> "" Then
            Me.LabelImageUrl.Text = Request.PhysicalApplicationPath & "Images/Uploaded/" & ImageName

        Else
            Me.LabelImageUrl.Text = "No image has been selected from the list"
        End If

    End Sub
End Class

ImageName is always ""

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Asked On
2007-11-09 at 12:39:05ID22951089
Tags

selectedindexchanged

,

listbox

,

fire

Topic

Programming for ASP.NET

Participating Experts
3
Points
0
Comments
11

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Answers

 

by: divinewind80Posted on 2007-11-09 at 13:08:20ID: 20253076

If you are trying to set the URL of the imagebutton to the selection in the listbox, why not just set it in the OnClick event of your ButtonLoadImageUrl button?  The effect would be the same.  It seems to me you are separating one thing into two... Try moving your code to as follows:

Protected Sub ButtonLoadImageUrl_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles ButtonLoadImageUrl.Click

        If ImageName <> "" Then
            Me.LabelImageUrl.Text = Request.PhysicalApplicationPath & "Images/Uploaded/" & ListBoxDoc.SelectedValue.ToString

        Else
            Me.LabelImageUrl.Text = "No image has been selected from the list"
        End If

    End Sub

 

by: brilloxPosted on 2007-11-09 at 13:17:07ID: 20253155

the problem is that ImageName comes from the selected listbox..

however I solved the problem..

I added the if Not page.IsPostback clause on the page load event

which is now like this

 If Not Page.IsPostBack Then
            Me.ListBoxDoc.DataSource = Getfiles(Request.PhysicalApplicationPath & "Documents/")
            Me.ListBoxDoc.DataBind()

            Me.ListBoxImages.DataSource = Getfiles(Request.PhysicalApplicationPath & "Images/Uploaded/")
            Me.ListBoxImages.DataBind()
        End If

and I am able now to get the selectedbalue from the listbox

however now the question is open so if you or any other experts have a better solution, I will be glad to learn

 

by: needo_jeePosted on 2007-11-09 at 13:20:16ID: 20253183

have you set the dorpdownlist 's postback property to tru?

<asp:ListBox ID="ListBox1" runat="server" AutoPostBack="True"></asp:ListBox>

thanks

 

by: brilloxPosted on 2007-11-09 at 13:22:50ID: 20253210

Actually, I can change this question (hope no experts will be angry)...

regarding the Getfiles(Request.PhysicalApplicationPath & "Documents/")

will this work once the website will be live

basically I want the user to get  the full url of the selected image from the uploaded images folder which is at  http://www.myweb.com/Images/Uploaded

I am doing the right thing ?

 

by: brilloxPosted on 2007-11-09 at 13:23:56ID: 20253218

Hi needo je

If Is et the postback to true, the page refresh and the listbox selected value is resetted to nothing... however I managed to slve this problem (see posty above). i am now thinking to another problem..

 

by: brilloxPosted on 2007-11-09 at 13:25:49ID: 20253234

I would like to get the http://www.website.com/
part of the url to which I can then attach the Images/Uploaded/Imagename part

 

by: brilloxPosted on 2007-11-09 at 13:46:47ID: 20253400

sorry Experts..

I also found this solution..

 Me.LabelImageUrl.Text = Server.MapPath("~") & "Images\Uploaded\" & ImageName
 if all the people that snwered here agree, I will ask for points refund..

let me know..

 

by: brilloxPosted on 2007-11-09 at 13:54:23ID: 20253444

ooppppss

Server.MapPath("~") & "Images\Uploaded\" & ImageName

it works but if I copy and paste into a browser obviosly does not work

now I am getting confused

HELP !!

 

by: brilloxPosted on 2007-11-09 at 13:55:10ID: 20253453

 

by: Vee_ModPosted on 2008-01-10 at 13:58:28ID: 20631743

Closed, 250 points refunded.
Vee_Mod
Community Support Moderator

20120131-EE-VQP-002

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