I am using the the Neodynamic SDK to print documents to the client side.
We will have 5 documents to print. I see how to print either 1 document or print all documents, but is there a way to print 1 document per button. I.e. button1 prints out doc1, button2 prints doc2, etc.
Here is what I've got so far
<script runat="server">
Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs)
fileone()
filetwo()
End Sub
Public Sub fileone()
Dim fileToPrint As New PrintFile(Context.Server.MapPath("~/forms/xmlheader.txt"), "xmlheader.txt")
If (WebClientPrint.ProcessPrintJob(Request)) Then
'Create a ClientPrintJob
Dim cpj As New ClientPrintJob()
'set client printer, for multiple files use DefaultPrinter...
cpj.ClientPrinter = New DefaultPrinter()
'set files-printers group by using special formatting!!!
'Invoice.doc PRINT TO Printer1
cpj.PrintFile = fileToPrint
'send it...
cpj.SendToClient(Response)
End If
End Sub
Public Sub filetwo()
Dim fileToPrint As New PrintFile(Context.Server.MapPath("~/forms/ How To Recover Office Doc.pdf"), " How To Recover Office Doc.pdf")
If (WebClientPrint.ProcessPrintJob(Request)) Then
'Create a ClientPrintJob
Dim cpj As New ClientPrintJob()
'set client printer, for multiple files use DefaultPrinter...
cpj.ClientPrinter = New DefaultPrinter()
'set files-printers group by using special formatting!!!
'Invoice.doc PRINT TO Printer1
cpj.PrintFile = fileToPrint
'send it...
cpj.SendToClient(Response)
End If
End Sub
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
fileone()
ScriptManager.RegisterStartupScript(Me, Me.GetType(), "printForm1", "printForm1();", True)
End Sub
Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs)
filetwo()
ScriptManager.RegisterStartupScript(Me, Me.GetType(), "printForm2", "printForm2();", True)
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>How to print multiple files to client printers from ASP.NET</title>
<script type="text/javascript">
function printForm1() {
jsWebClientPrint.print(fileone());
}
function printForm2() {
jsWebClientPrint.print(filetwo());
}
</script>
</head>
<body>
<%-- Store User's SessionId --%>
<input type="hidden" id="sid" name="sid" value="<%=Session.SessionID%>" />
<form id="form1" runat="server">
<h1>How to print multiple files to client printers from ASP.NET</h1>
Please change the source code to match your printer names and files to test it locally
<br /><br />
<%-- Add Reference to jQuery at Google CDN --%><script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js" type="text/javascript"></script><%-- Register the WebClientPrint script code --%><%=Neodynamic.SDK.Web.WebClientPrint.CreateScript()%>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button"
Height="156px" Width="156px" />
<asp:Button ID="Button2" runat="server" onclick="Button2_Click" Text="Button" Height="156px" Width="156px"/>
<asp:Button ID="Button3" runat="server" onclick="Button3_Click" Text="Button"
Height="156px" Width="156px"/>
<asp:Button ID="Button4" runat="server" onclick="Button4_Click" Text="Button"
Height="156px" Width="156px"/>
<asp:Button ID="Button5" runat="server" onclick="Button5_Click" Text="Button"
Height="156px" Width="156px"/>
</form>
</body>
</html>
I thought of changing filetwo() variable to clientprintjob cpj2...
What you need is to make a function called PrintDoc() that receives the path of the file to print as a parameter. The signature should look like this:
Private Sub PrintDoc(path as String)
End Sub
You only need this function once and no need for sub fileone() and sub filetwo() ... up to filefive(). You just need this one sub called PrintDoc(path as String)
Then you need 5 buttons, each with their own _Click() event and in that event handler you call the PrintDoc procedure by passing a different param everytime.
Hope this helps.
Good luck!
Related
so i want to have a button the changes the text of a label when i click it and it says page not available, but when i comment out the update panel it atleast shows up.
<form id="form1" runat="server">
<asp:ScriptManager ID="s1" runat = "server"></asp:ScriptManager>
<div>
<h1>UpDaTe PaNeL tEsT PaGe</h1>
start text : Hello <br />
updated text: World<br />
<hr />
<asp:UpdatePanel ID="p1" runat="server">
<ContentTemplate>
<asp:Button ID="Button1" runat="server" Text="Update" OnClick="updateLabel" Height="29px" Width="110px"/> -->
Text: <asp:Label ID="Label1" runat="server" Text="hello"></asp:Label>
</ContentTemplate>
</asp:UpdatePanel>
</div>
</form>
codebehind
Public Class aaaa
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
End Sub
Function updatelabel() As String
Label1.Text = "World"
End Function
End Class
The previous answer is correct. The handler for the Label Click event needs the sender as Object and the e as EventArgs parameters. If you do not put them, your updateLabeL() function will not be a valid match for the event handler.
You can remove the OnClick from the button and Try the classic method of handling events.
So your code will be... ( Sorry I'm posting it via app so it might not be in code view )
Protected Sub ChangeLabel(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Label1.text = "TextGoesHere"
End Sub
I have a page that queries a DB and displays information for a number of printers. I have several sections that I would like to update at different intervals client-side using AJAX (at least this is best solution my research has come up with). I can get AJAX itself to work with the common "Show the time" example without any issues.
My problem is that the IDs if the sections I want to update (I've tried span, asp:label, div...> are generated with the server side code and ends up something like "Label1", "Label2"...
Every time I try to update the text inside one of these generated labels I get "'Label1' is not declared. It may be inaccessible due to its protection level". Everything is within a form tag, everything is "runat="server"". I feel like I'm just missing a setting, or a reference to something. So far I haven't been able to narrow my searching enough to get a useful answer.
I've lurked around here for years and have always been able to find a solution. This has me stumped though.
---- Example -----
The end goal is to have better control of when and how specific elements are updated. This is using the Timer tutorial demo. In my application I would be assigning IDs for the labels based on a record ID from a query (i.e. ID = "Mach" & MID)
The original code that works as posted:
<form id="form1" runat="server">
<div>
<!-- Ajax button code start -->
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:Button ID="Button1" runat="server" Text="Ajax - Button" onclick="Button1_Click" />
</ContentTemplate>
</asp:UpdatePanel>
<!-- Ajax button code end -->
<br /><br />
<!-- Non - Ajax button code start -->
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>
<asp:Button ID="Button2" runat="server" Text="Non - Ajax - Button" onclick="Button2_Click" />
<!-- Non - Ajax button code end -->
</div>
</form>
And the Code Behind
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Label1.Text = DateTime.Now.ToString()
Label2.Text = DateTime.Now.ToString()
End Sub
Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Label1.Text = DateTime.Now.ToString()
Label2.Text = DateTime.Now.ToString()
End Sub
It seems to me the follow should work the same way:
<form id="form1" runat="server">
<div>
<% Call Generated()%>
</div>
</form>
Code Behind:
Public Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Label1.Text = DateTime.Now.ToString()
Label2.Text = DateTime.Now.ToString()
End Sub
Public Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Label1.Text = DateTime.Now.ToString()
Label2.Text = DateTime.Now.ToString()
End Sub
Public Sub Generated()
Dim str As String
str = "<div>"
str = str & ("<asp:ScriptManager ID=""ScriptManager1"" runat=""server"" />")
str = str & ("<asp:UpdatePanel ID=""UpdatePanel1"" runat=""server"">")
str = str & ("<ContentTemplate>")
str = str & ("<asp:Label ID=""Label1"" runat=""server"" Text=""Label""></asp:Label>")
str = str & ("<asp:Button ID=""Button1"" runat=""server"" Text=""Ajax - Button"" onclick=""Button1_Click"" />")
str = str & ("</ContentTemplate>")
str = str & ("</asp:UpdatePanel>")
str = str & ("<br /><br />")
str = str & ("<asp:Label ID=""Label2"" runat=""server"" Text=""Label""></asp:Label>")
str = str & ("<asp:Button ID=""Button2"" runat=""server"" Text=""Non - Ajax - Button"" onclick=""Button2_Click"" />")
str = str & ("</div>")
End Sub
I'm working on some .NET code in visual studio web developer and I'm having an issue. When I double click on a button in design view, instead of loading a subprocedure, all it does is highlight this: <asp:Button ID="btnEnter" runat="server" Text="Enter" onclick="btnEnter_Click" />
When I try to run that just to see what happens, I get this error:
Line 8: <asp:Button ID="btnEnter" runat="server"
Compiler Error Message: BC30456: 'btnEnter_Click' is not a member of 'ASP.default_aspx'.
If I erase the onclick="btnEnter_Click" and run it, it works. Either way though, when I double click the button / element, shouldn't it create a subprocedure for me that looks something like?
Protected Sub TextBox1_TextChanged(sender As Object, e As EventArgs)
End Sub
I've tried entering that manaully but the keywords don't turn blue or any sort of color, and when I run it, it just shows up as text on the webform with my other elements. Here is all I have so far:
<%# Page Title="Home Page" Language="VB"%>
<form id="form1" runat="server">
<asp:Label ID="Label1" runat="server" Text="Enter a person's name below"></asp:Label>
<p>
<asp:TextBox ID="txtStudentName" runat="server"></asp:TextBox>
</p>
<p>
<asp:Button ID="btnEnter" runat="server"
Text="Enter" onclick="btnEnter_Click" />
</p>
<p>
<asp:Button ID="btnDisplay" runat="server" Text="Display all and exit" />
</p>
<p>
<asp:Label ID="lbl2" runat="server" Text=" "></asp:Label>
</p>
<p>
<asp:Label ID="lbl3" runat="server" Text=" "></asp:Label>
</p>
<p>
<asp:Label ID="lbl4" runat="server" Text=" "></asp:Label>
</p>
<p>
<asp:Label ID="lbl5" runat="server" Text=" "></asp:Label>
</p>
</form>
Edit:
When I enter my code inside the default.aspx.vb file, it highlights keywords and such, but it can't reference the elements I created in the design view.
Partial Class _Default
Inherits System.Web.UI.Page
End Class
Class Lab1
Protected Sub TextBox1_TextChanged(sender As Object, e As EventArgs)
End Sub
Public Const length As Integer = 3
Shared counter2 As Integer = 0
Public Shared studentList As String() = New String(2) {}
Protected Sub btnEnter_Click(sender As Object, e As EventArgs)
Label1.Text = "Enter a person's name"
Dim studentName As [String] = txtStudentName.Text
If studentList.Length <= length Then
If txtStudentName.Text <> "" Then
Dim match As [Boolean] = True
Dim i As Integer = 0
While counter2 >= i
If studentList(i) IsNot Nothing Then
If studentList(i).ToUpper() = txtStudentName.Text.ToUpper() Then
match = False
Label1.Text = "This name has already been used"
End If
End If
i += 1
End While
If match = True Then
studentList(counter2) = txtStudentName.Text
counter2 += 1
End If
End If
End If
End Sub
End Class
Your Page declaration seems to say you are using inline style:
<%# Page Title="Home Page" Language="VB"%>
Which means your code is/should be within aspx file itself in a script runat="server" tag:
<%# Page Language="VB" %>
<!DOCTYPE html>
<script runat="server">
Protected Sub Button1_Click(sender As Object, e As EventArgs)
'Do something
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
</div>
</form>
</body>
</html>
However, your other code indicates you seem to want to use code-behind model, where you have .vb files (e.g. foo.aspx.vb)
The Page is declared like this for web sites (for web applications it will say CodeBehind="foo.aspx.vb"):
<%# Page Language="VB" AutoEventWireup="false" CodeFile="foo.aspx.vb" Inherits="foo" %>
You will find a foo.asp.vb file in your project
it's class name will be the name of your file (foo)
your code should be scoped to this class (I'm not sure what Class Lab1 in your post above is for....
foo.aspx.vb:
Partial Class foo
Inherits System.Web.UI.Page
Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
'Do something
End Sub
End Class
The "fix" is for you to:
choose which model you want to write code: inline or code-behind
declare the Page appropriately
for inline, your code will be in the aspx file itself
for code-behind, your code will live, and should be encapsulated within the Class file of the page.
The Page declaration actually says so:
CodeFile="foo.aspx.vb" is the file where the code is
Inherits="foo" is the Partial Class in the file (Partial Class foo)
Try this
Private Sub btnEnter_Click(sender As Object, e As System.EventArgs) Handles btnEnter.Click
End Sub
Here, btnEnter_Click is your event name and use the Handles keyword at the end of a procedure declaration to cause it to handle events raised by an object variable
I know this flavor of question has been asked multiple times, but I've spent hours sifting through answers that don't match or don't work and I'm at wits end.
Background: I have a situation where I want to evaluate a record to make sure it fits a specific set of criteria. If it fits the criteria, raise an alert message for confirmation from the user. I do not want to raise the popup unless the criteria matches.
Pseudocode of what I want to accomplish:
User enters information in multiple fields
User clicks "Save" (cmdUpdate)
within the "Save" click function it checks to see if the same record already exists
in the database (e.g. this is a duplicate).
If it's not a duplicate continue with the save function
If it's a duplicate prompt the user for confirmation to save the dup.
I can't get the popup to display before/after the postback. I've tried a hack workaround of setting a session value to maintain the state. The value tests positive in the prerender and does call the modalpopupextender.show but it never fires successfully to the screen. I'm not opposed to switching to a javascript solution if someone has a better method but I have to do the check for duplicates in the asp.net code behind.
Markup:
<asp:UpdatePanel ID="upMainContent" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="False" >
<ContentTemplate>
<asp:Label ID="lblDummy" runat="server" EnableViewState="false" Style="display: none;" />
<asp:Panel ID="pnlConfirmation" runat="server" Width="400px" Style="display: none;" CssClass="ModalPopupFront">
<div ID="Div1" runat="server" class="PopupHeader" style="width:400px;"> Duplicate Record</div>
<br />
<asp:Label ID="lblConfirmationMessage" runat="server" Text="This record has already exists.<br/> Are you sure you want to save a duplicate entry?"></asp:Label><br />
<br />
<div style="text-align:right;">
<asp:Button ID="btnSaveAnyway" runat="server" Text="Save" OnClick="btnSaveAnyway_Click" />
<asp:Button ID="btnCancelSave" runat="server" Text="Cancel" OnClick="btnCancelSave_Click" />
</div>
</asp:Panel>
<ajax:ModalPopupExtender ID="mpeSaveConfirmation" runat="server" Enabled="False"
TargetControlID="lblDummy" PopupControlID="pnlConfirmation"
BackgroundCssClass="modalBackground" DropShadow="true"
CancelControlID="btnCancelSave"
RepositionMode="RepositionOnWindowResizeAndScroll" PopupDragHandleControlID="pnlConfirmation" Drag="true">
</ajax:ModalPopupExtender>
<!-- all the input fields/misc content -->
<asp:Button id="cmdUpdate" runat="server" CausesValidation="true" OnClick="cmdUpdate_Click" Text="Save" ValidationGroup="vg1" ToolTip="Save the current record" TabIndex="102" />
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="ddlStateId" EventName="SelectedIndexChanged" />
<asp:AsyncPostBackTrigger ControlID="ddlCountyId" EventName="SelectedIndexChanged" />
</Triggers>
</asp:UpdatePanel>
Code behind:
Protected Sub Page_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreRender
'...
If GetSessionValue("HackWorkaround") Then
mpeSaveConfirmation.Enabled = True
mpeSaveConfirmation.Show()
End If
End Sub
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
'...
If not Page.IsPostBack Then
SetSessionValue("HackWorkaround", False)
End if
'...
End Sub
Protected Sub cmdUpdate_Click(ByVal sender As Object, ByVal e As System.EventArgs)
If tbOpTill.NewRecordIdenticalToLast() And tbOpRecord.NewRecordIdenticalToLast() Then
SetSessionValue("HackWorkaround", True)
Else
SetSessionValue("HackWorkaround", False)
SetSessionValue("LastOpRecordIDSaved", tbOpRecord.OpRecordId)
Dim isEdit As Boolean = ResetOpRecord("Till", tbOpTill)
SmartRedirect("Optill/oprecord_edit.aspx")
End If
End Sub
Protected Sub btnSaveAnyway_Click(ByVal sender As Object, ByVal e As System.EventArgs)
SetSessionValue("HackWorkaround", False)
mpeSaveConfirmation.Enabled = False
mpeSaveConfirmation.Hide()
'Duplicate record exists, but the customer wants to save anyway.
DoSave()
Dim isEdit As Boolean = ResetOpRecord("Till", tbOpTill)
SmartRedirect("Optill/oprecord_edit.aspx")
End Sub
Protected Sub btnCancelSave_Click(ByVal sender As Object, ByVal e As System.EventArgs)
SetSessionValue("HackWorkaround", False)
mpeSaveConfirmation.Enabled = False
mpeSaveConfirmation.Hide()
'do nothing and return to the screen.
End Sub
Your issue is here:
<ajax:ModalPopupExtender ID="mpeSaveConfirmation" runat="server" Enabled="False"
Protected Sub btnSaveAnyway_Click(ByVal sender As Object, ByVal e As System.EventArgs)
SetSessionValue("HackWorkaround", False)
**mpeSaveConfirmation.Enabled = False**
mpeSaveConfirmation.Hide()
Make it true in code behind. and sync hide show accordingly. Also i can see in your code at some places you are using Style="display:none". So if you want to display you need use HtmlStyleWriter.Display,"block". If you use Visible true false in that case it will not work. I mean to say, that where ever you are using visible true false, in codebehind you have to use similar. If you are using style, then in codebehind you have to use the same.
Well I have a strange problem.
I have a page with 2 DropDownLists on it and a custom web-user-control. The custom web user control has an UpdatePanel within it, and an Ajax Timer control within the UpdatePanel to periodically update a listing of stuff.
When I "drop-down" one of the DropDownLists and hover over (not click on) an option while the Timer control within the UpdatePanel asynchronously posts back to the server, the DropDownList "autopostbacks" to the server!
I'm trying to figure out why an asynchronous postback would cause the DropDownList to act as if I selected/clicked on an option so that I can find a way around this issue.
Now it's really simple to reproduce this problem.
Create a Web User control called "TimerUpdatedListing"...this is the ASPX code markup for the web user control:
<%# Control Language="vb" AutoEventWireup="false" CodeBehind="TimerUpdatedListing.ascx.vb" Inherits="MyNamespace.TimerUpdatedListing" %>
<div style="width: 150px; height: 150px; overflow: auto; border: solid 1px navy;">
<asp:UpdatePanel ID="anUpdatePanel" runat="server">
<ContentTemplate>
<asp:Repeater ID="aRepeater" runat="server">
<ItemTemplate>
<div style="border-bottom: solid 1px #EEC900; margin: 3px; padding: 2px;">
Id:
<%#Eval("Id")%>
<br />
Time:
<%#Eval("Time")%>
</div>
</ItemTemplate>
</asp:Repeater>
<asp:Timer ID="aTimer" runat="server" Interval="2000">
</asp:Timer>
</ContentTemplate>
</asp:UpdatePanel>
</div>
This is the VB.NET server side code for the web user control:
Public Partial Class TimerUpdatedListing
Inherits System.Web.UI.UserControl
Private _aListOFThings As List(Of Things)
Private Sub aTimer_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles aTimer.Tick
If Session("_aListOfThings") Is Nothing Then
_aListOFThings = New List(Of Things)
Else
_aListOFThings = CType(Session("_aListOfThings"), List(Of Things))
End If
If _aListOFThings.Count > 9 Then
_aListOFThings = New List(Of Things)
End If
_aListOFThings.Add(New Things((_aListOFThings.Count + 1).ToString, Now.ToString("hh:mm:ss")))
Session("_aListOfThings") = _aListOFThings
aRepeater.DataSource = _aListOFThings
aRepeater.DataBind()
End Sub
Private Class Things
Private _time As String
Private _id As String
Public Property Time() As String
Get
Return _time
End Get
Set(ByVal value As String)
_time = value
End Set
End Property
Public Property ID() As String
Get
Return _id
End Get
Set(ByVal value As String)
_id = value
End Set
End Property
Public Sub New(ByVal id As String, ByVal time As String)
_id = id
_time = time
End Sub
End Class
End Class
Now, in an ASPX page called WebForm1.aspx, add 2 DropDownLists and the web user control:
<%# Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm1.aspx.vb" Inherits="MyNamespace.WebForm1" %>
<%# Register Src="TimerUpdatedListing.ascx" TagName="TimerUpdatedListing" TagPrefix="uc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Test</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true">
<asp:ListItem Text="1" Value="1" />
<asp:ListItem Text="2" Value="2" />
<asp:ListItem Text="3" Value="3" />
<asp:ListItem Text="4" Value="4" />
<asp:ListItem Text="5" Value="5" />
</asp:DropDownList>
<asp:Label ID="selectedValue1" runat="server"></asp:Label>
<br />
<asp:DropDownList ID="DropDownList2" runat="server" AutoPostBack="true">
<asp:ListItem Text="a" Value="a" />
<asp:ListItem Text="b" Value="b" />
<asp:ListItem Text="c" Value="c" />
<asp:ListItem Text="d" Value="d" />
<asp:ListItem Text="e" Value="e" />
</asp:DropDownList>
<asp:Label ID="selectedValue2" runat="server"></asp:Label>
<br />
<br />
<uc1:TimerUpdatedListing ID="TimerUpdatedListing1" runat="server" />
</div>
</form>
</body>
</html>
Here is the VB.NET server side code for the WebForm1.aspx page:
Public Partial Class WebForm1
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If String.IsNullOrEmpty(Request.Params("ddl1")) = False Then
selectedValue1.Text = Request.Params("ddl1")
End If
If String.IsNullOrEmpty(Request.Params("ddl2")) = False Then
selectedValue2.Text = Request.Params("ddl2")
End If
End Sub
Private Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged
Response.Redirect(Request.Url.LocalPath + "?ddl1=" + DropDownList1.SelectedValue.ToString, True)
End Sub
Private Sub DropDownList2_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList2.SelectedIndexChanged
Response.Redirect(Request.Url.LocalPath + "?ddl2=" + DropDownList2.SelectedValue.ToString, True)
End Sub
End Class
Thanks,
-Frinny
Here is an example of using triggers to trigger your update panel. Put the timer.tick event as a trigger and see what happens
http://www.asp.net/ajax/tutorials/understanding-asp-net-ajax-updatepanel-triggers
PS: I don't think the timer has to be included within the update panel. I actually build my timers in the codebehind and keep them out of the markup all together.
I attempted two different solutions to this problem.
The first thing I did was to check the Request.Params("__EVENTTARGET") to see if it matched the DropDownList. If it matched then I would call the Response.Redirect() method.
For example:
Public Partial Class WebForm1
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If String.IsNullOrEmpty(Request.Params("ddl1")) = False Then
selectedValue1.Text = Request.Params("ddl1")
End If
If String.IsNullOrEmpty(Request.Params("ddl2")) = False Then
selectedValue2.Text = Request.Params("ddl2")
End If
End Sub
Private Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged
Dim ctrlNameThatCausedPostback As String = Request.Params("__EVENTTARGET")
If String.IsNullOrEmpty(ctrlNameThatCausedPostback) = False AndAlso Page.FindControl(ctrlNameThatCausedPostback) Is DropDownList1 Then
Response.Redirect(Request.Url.LocalPath + "?ddl1=" + DropDownList1.SelectedValue.ToString, True)
End If
End Sub
Private Sub DropDownList2_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList2.SelectedIndexChanged
Dim ctrlNameThatCausedPostback As String = Request.Params("__EVENTTARGET")
If String.IsNullOrEmpty(ctrlNameThatCausedPostback) = False AndAlso Page.FindControl(ctrlNameThatCausedPostback) Is DropDownList2 Then
Response.Redirect(Request.Url.LocalPath + "?ddl2=" + DropDownList2.SelectedValue.ToString, True)
End If
End Sub
End Class
I noticed that this didn't always work. There were times when I selected an option in the DropDownList and the Redirect wouldn't take place because the timer tick and the selected index changed event happened at the same time.
So the second approach I took was to check to see if the page is in an asynchronous postback to the server. If it was, then I knew that it was the timer tick event taking place and that the Redirect shouldn't occur.
For example:
Public Partial Class WebForm1
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If String.IsNullOrEmpty(Request.Params("ddl1")) = False Then
selectedValue1.Text = Request.Params("ddl1")
End If
If String.IsNullOrEmpty(Request.Params("ddl2")) = False Then
selectedValue2.Text = Request.Params("ddl2")
End If
End Sub
Private Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged
If ScriptManager.GetCurrent(Me.Page).IsInAsyncPostBack = False Then
Response.Redirect(Request.Url.LocalPath + "?ddl1=" + DropDownList1.SelectedValue.ToString, True)
End If
End Sub
Private Sub DropDownList2_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList2.SelectedIndexChanged
If ScriptManager.GetCurrent(Me.Page).IsInAsyncPostBack = False Then
Response.Redirect(Request.Url.LocalPath + "?ddl2=" + DropDownList2.SelectedValue.ToString, True)
End If
End Sub
End Class
This helped, and the likelihood that the Redirect would occur properly was better than the previous approach; however, it still isn't 100%.
-Frinny