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AddHandler not workingthe user to go to the page containing a question they have not answered. The code that creates the LinkButton is called, as well as the AddHandler line (I ran a Debug and saw that it executes this code, and the links are displayed on the page afterwards). However, the eventhandler is not called when the LinkButton is clicked. Here is the code that dynamically generates the LinkButtons as well as the eventhandler I want to be called: 'The code that generates the LinkButtons: Private Sub btnSubmit_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles btnSubmit.Click Me.submitanswers() If Me.completetest() Then 'Code that I use to update my database, not involved in this problem because Me.completetest() returns false Else Me.lblAnswered.Text = String.Format("{0} of 75 Questions Answered (Not Answered: ", CStr(Me.questionsanswered())) Dim myconnection As New SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) Dim cmd As New SqlCommand("", myconnection) Dim qnumreader As SqlDataReader Dim insertafter As Integer = Me.Form.Controls.IndexOf(Me.lblAnswered) + 1 For i As Integer = 1 To 75 cmd.CommandText = String.Format("SELECT questions.questionnumber FROM useranswers INNER JOIN questions ON useranswers.questionid=questions.questionid WHERE questions.questionnumber={0} AND useranswers.testid={1} AND useranswers.userid={2}", i, CStr(Session("testid")), CStr(Session("userid"))) myconnection.Open() qnumreader = cmd.ExecuteReader() If Not qnumreader.Read() Then Dim questionlink As New LinkButton() questionlink.CausesValidation = False questionlink.CommandArgument = i questionlink.CssClass = "answerRED" questionlink.EnableViewState = False questionlink.Text = i & " " AddHandler questionlink.Command, AddressOf Me.QuestionLinkCommand Me.Form.Controls.AddAt(insertafter, questionlink) insertafter += 1 End If myconnection.Close() Next Me.lblCloseParen.Visible = True End If End Sub 'The eventhandler I want to use: Private Sub QuestionLinkCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.CommandEventArgs) Dim myconnection As New SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) Dim cmd As New SqlCommand("SELECT subgroupid FROM questions WHERE questionnumber=" & e.CommandArgument, myconnection) myconnection.Open() Session("subgroupid") = CInt(cmd.ExecuteScalar()) myconnection.Close() End Sub When I run my Application, the code in btnSubmit_Click works as I expect (or at least it looks like it did), but when I click the dynamically created LinkButtons (variable name questionlink), they postback but do not trigger the QuestionLinkCommand method (the QuestionLinkCommand never gets executed when I do a debug session). I cannot figure out why they are not triggering this eventhandler, because I use AddHandler statements when creating the LinkButtons, and the eventhandler has the correct signature. Is there something I am doing wrong? Thanks. Try changing the line
Dim questionlink As New LinkButton() to Dim WithEvents questionlink As New LinkButton() Does that work? Show quote "Nathan Sokalski" wrote: > I have a section of my code that dynamically creates LinkButtons to allow > the user to go to the page containing a question they have not answered. The > code that creates the LinkButton is called, as well as the AddHandler line > (I ran a Debug and saw that it executes this code, and the links are > displayed on the page afterwards). However, the eventhandler is not called > when the LinkButton is clicked. Here is the code that dynamically generates > the LinkButtons as well as the eventhandler I want to be called: > > > 'The code that generates the LinkButtons: > Private Sub btnSubmit_Click(ByVal sender As Object, ByVal e As > System.Web.UI.ImageClickEventArgs) Handles btnSubmit.Click > Me.submitanswers() > If Me.completetest() Then > 'Code that I use to update my database, not involved in this > problem because Me.completetest() returns false > Else > Me.lblAnswered.Text = String.Format("{0} of 75 Questions > Answered (Not Answered: ", CStr(Me.questionsanswered())) > Dim myconnection As New > SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) > Dim cmd As New SqlCommand("", myconnection) > Dim qnumreader As SqlDataReader > Dim insertafter As Integer = > Me.Form.Controls.IndexOf(Me.lblAnswered) + 1 > For i As Integer = 1 To 75 > cmd.CommandText = String.Format("SELECT > questions.questionnumber FROM useranswers INNER JOIN questions ON > useranswers.questionid=questions.questionid WHERE > questions.questionnumber={0} AND useranswers.testid={1} AND > useranswers.userid={2}", i, CStr(Session("testid")), > CStr(Session("userid"))) > myconnection.Open() > qnumreader = cmd.ExecuteReader() > If Not qnumreader.Read() Then > Dim questionlink As New LinkButton() > questionlink.CausesValidation = False > questionlink.CommandArgument = i > questionlink.CssClass = "answerRED" > questionlink.EnableViewState = False > questionlink.Text = i & " " > AddHandler questionlink.Command, AddressOf > Me.QuestionLinkCommand > Me.Form.Controls.AddAt(insertafter, questionlink) > insertafter += 1 > End If > myconnection.Close() > Next > Me.lblCloseParen.Visible = True > End If > End Sub > > 'The eventhandler I want to use: > Private Sub QuestionLinkCommand(ByVal sender As Object, ByVal e As > System.Web.UI.WebControls.CommandEventArgs) > Dim myconnection As New > SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) > Dim cmd As New SqlCommand("SELECT subgroupid FROM questions WHERE > questionnumber=" & e.CommandArgument, myconnection) > myconnection.Open() > Session("subgroupid") = CInt(cmd.ExecuteScalar()) > myconnection.Close() > End Sub > > > When I run my Application, the code in btnSubmit_Click works as I expect (or > at least it looks like it did), but when I click the dynamically created > LinkButtons (variable name questionlink), they postback but do not trigger > the QuestionLinkCommand method (the QuestionLinkCommand never gets executed > when I do a debug session). I cannot figure out why they are not triggering > this eventhandler, because I use AddHandler statements when creating the > LinkButtons, and the eventhandler has the correct signature. Is there > something I am doing wrong? Thanks. > -- > Nathan Sokalski > njsokal***@hotmail.com > http://www.nathansokalski.com/ > > > No, if I add the WithEvents keyword I recieve the message:
'WithEvents' is not valid on a local variable declaration. That was a good suggestion (when I read your reply I thought that might be it), but unfortunately it wasn't. Any other ideas? Thanks. Show quote "Charlie" <c2f***@yahoo.com> wrote in message news:43147344-9CEC-4953-91B5-9BF2FB12532E@microsoft.com... > Try changing the line > > Dim questionlink As New LinkButton() > > to > > Dim WithEvents questionlink As New LinkButton() > > Does that work? > > > "Nathan Sokalski" wrote: > >> I have a section of my code that dynamically creates LinkButtons to allow >> the user to go to the page containing a question they have not answered. >> The >> code that creates the LinkButton is called, as well as the AddHandler >> line >> (I ran a Debug and saw that it executes this code, and the links are >> displayed on the page afterwards). However, the eventhandler is not >> called >> when the LinkButton is clicked. Here is the code that dynamically >> generates >> the LinkButtons as well as the eventhandler I want to be called: >> >> >> 'The code that generates the LinkButtons: >> Private Sub btnSubmit_Click(ByVal sender As Object, ByVal e As >> System.Web.UI.ImageClickEventArgs) Handles btnSubmit.Click >> Me.submitanswers() >> If Me.completetest() Then >> 'Code that I use to update my database, not involved in this >> problem because Me.completetest() returns false >> Else >> Me.lblAnswered.Text = String.Format("{0} of 75 Questions >> Answered (Not Answered: ", CStr(Me.questionsanswered())) >> Dim myconnection As New >> SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) >> Dim cmd As New SqlCommand("", myconnection) >> Dim qnumreader As SqlDataReader >> Dim insertafter As Integer = >> Me.Form.Controls.IndexOf(Me.lblAnswered) + 1 >> For i As Integer = 1 To 75 >> cmd.CommandText = String.Format("SELECT >> questions.questionnumber FROM useranswers INNER JOIN questions ON >> useranswers.questionid=questions.questionid WHERE >> questions.questionnumber={0} AND useranswers.testid={1} AND >> useranswers.userid={2}", i, CStr(Session("testid")), >> CStr(Session("userid"))) >> myconnection.Open() >> qnumreader = cmd.ExecuteReader() >> If Not qnumreader.Read() Then >> Dim questionlink As New LinkButton() >> questionlink.CausesValidation = False >> questionlink.CommandArgument = i >> questionlink.CssClass = "answerRED" >> questionlink.EnableViewState = False >> questionlink.Text = i & " " >> AddHandler questionlink.Command, AddressOf >> Me.QuestionLinkCommand >> Me.Form.Controls.AddAt(insertafter, questionlink) >> insertafter += 1 >> End If >> myconnection.Close() >> Next >> Me.lblCloseParen.Visible = True >> End If >> End Sub >> >> 'The eventhandler I want to use: >> Private Sub QuestionLinkCommand(ByVal sender As Object, ByVal e As >> System.Web.UI.WebControls.CommandEventArgs) >> Dim myconnection As New >> SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) >> Dim cmd As New SqlCommand("SELECT subgroupid FROM questions WHERE >> questionnumber=" & e.CommandArgument, myconnection) >> myconnection.Open() >> Session("subgroupid") = CInt(cmd.ExecuteScalar()) >> myconnection.Close() >> End Sub >> >> >> When I run my Application, the code in btnSubmit_Click works as I expect >> (or >> at least it looks like it did), but when I click the dynamically created >> LinkButtons (variable name questionlink), they postback but do not >> trigger >> the QuestionLinkCommand method (the QuestionLinkCommand never gets >> executed >> when I do a debug session). I cannot figure out why they are not >> triggering >> this eventhandler, because I use AddHandler statements when creating the >> LinkButtons, and the eventhandler has the correct signature. Is there >> something I am doing wrong? Thanks. >> -- >> Nathan Sokalski >> njsokal***@hotmail.com >> http://www.nathansokalski.com/ >> >> >> Put the declaration of questionlink outside of the btnSubmit_Click code
block, in the general declarations area... public withevents questionlink as New LinkButton() inside your codeblock, remove the dim questionlink line. you could also scope the linkbutton as public or friend. does that work? Show quote "Nathan Sokalski" wrote: > No, if I add the WithEvents keyword I recieve the message: > > 'WithEvents' is not valid on a local variable declaration. > > That was a good suggestion (when I read your reply I thought that might be > it), but unfortunately it wasn't. Any other ideas? Thanks. > -- > Nathan Sokalski > njsokal***@hotmail.com > http://www.nathansokalski.com/ > > "Charlie" <c2f***@yahoo.com> wrote in message > news:43147344-9CEC-4953-91B5-9BF2FB12532E@microsoft.com... > > Try changing the line > > > > Dim questionlink As New LinkButton() > > > > to > > > > Dim WithEvents questionlink As New LinkButton() > > > > Does that work? > > > > > > "Nathan Sokalski" wrote: > > > >> I have a section of my code that dynamically creates LinkButtons to allow > >> the user to go to the page containing a question they have not answered. > >> The > >> code that creates the LinkButton is called, as well as the AddHandler > >> line > >> (I ran a Debug and saw that it executes this code, and the links are > >> displayed on the page afterwards). However, the eventhandler is not > >> called > >> when the LinkButton is clicked. Here is the code that dynamically > >> generates > >> the LinkButtons as well as the eventhandler I want to be called: > >> > >> > >> 'The code that generates the LinkButtons: > >> Private Sub btnSubmit_Click(ByVal sender As Object, ByVal e As > >> System.Web.UI.ImageClickEventArgs) Handles btnSubmit.Click > >> Me.submitanswers() > >> If Me.completetest() Then > >> 'Code that I use to update my database, not involved in this > >> problem because Me.completetest() returns false > >> Else > >> Me.lblAnswered.Text = String.Format("{0} of 75 Questions > >> Answered (Not Answered: ", CStr(Me.questionsanswered())) > >> Dim myconnection As New > >> SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) > >> Dim cmd As New SqlCommand("", myconnection) > >> Dim qnumreader As SqlDataReader > >> Dim insertafter As Integer = > >> Me.Form.Controls.IndexOf(Me.lblAnswered) + 1 > >> For i As Integer = 1 To 75 > >> cmd.CommandText = String.Format("SELECT > >> questions.questionnumber FROM useranswers INNER JOIN questions ON > >> useranswers.questionid=questions.questionid WHERE > >> questions.questionnumber={0} AND useranswers.testid={1} AND > >> useranswers.userid={2}", i, CStr(Session("testid")), > >> CStr(Session("userid"))) > >> myconnection.Open() > >> qnumreader = cmd.ExecuteReader() > >> If Not qnumreader.Read() Then > >> Dim questionlink As New LinkButton() > >> questionlink.CausesValidation = False > >> questionlink.CommandArgument = i > >> questionlink.CssClass = "answerRED" > >> questionlink.EnableViewState = False > >> questionlink.Text = i & " " > >> AddHandler questionlink.Command, AddressOf > >> Me.QuestionLinkCommand > >> Me.Form.Controls.AddAt(insertafter, questionlink) > >> insertafter += 1 > >> End If > >> myconnection.Close() > >> Next > >> Me.lblCloseParen.Visible = True > >> End If > >> End Sub > >> > >> 'The eventhandler I want to use: > >> Private Sub QuestionLinkCommand(ByVal sender As Object, ByVal e As > >> System.Web.UI.WebControls.CommandEventArgs) > >> Dim myconnection As New > >> SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) > >> Dim cmd As New SqlCommand("SELECT subgroupid FROM questions WHERE > >> questionnumber=" & e.CommandArgument, myconnection) > >> myconnection.Open() > >> Session("subgroupid") = CInt(cmd.ExecuteScalar()) > >> myconnection.Close() > >> End Sub > >> > >> > >> When I run my Application, the code in btnSubmit_Click works as I expect > >> (or > >> at least it looks like it did), but when I click the dynamically created > >> LinkButtons (variable name questionlink), they postback but do not > >> trigger > >> the QuestionLinkCommand method (the QuestionLinkCommand never gets > >> executed > >> when I do a debug session). I cannot figure out why they are not > >> triggering > >> this eventhandler, because I use AddHandler statements when creating the > >> LinkButtons, and the eventhandler has the correct signature. Is there > >> something I am doing wrong? Thanks. > >> -- > >> Nathan Sokalski > >> njsokal***@hotmail.com > >> http://www.nathansokalski.com/ > >> > >> > >> > > > Nathan,
Here is a simple sample of dynamicly creating textboxes with events. Will you be so kind if you send next time problems to these newsgroup to show a simple sample instead of almost a complete sample. We want to help you, however not doing a daytime job by investigating parts which are not relevant to your question. Cor
Show quote
On Oct 1, 9:38 pm, "Nathan Sokalski" <njsokal***@hotmail.com> wrote: You apparently aren't to familiar with the programming modal of> I have a section of my code that dynamically creates LinkButtons to allow > the user to go to the page containing a question they have not answered. The > code that creates the LinkButton is called, as well as the AddHandler line > (I ran a Debug and saw that it executes this code, and the links are > displayed on the page afterwards). However, the eventhandler is not called > when the LinkButton is clicked. Here is the code that dynamically generates > the LinkButtons as well as the eventhandler I want to be called: > > 'The code that generates the LinkButtons: > Private Sub btnSubmit_Click(ByVal sender As Object, ByVal e As > System.Web.UI.ImageClickEventArgs) Handles btnSubmit.Click > Me.submitanswers() > If Me.completetest() Then > 'Code that I use to update my database, not involved in this > problem because Me.completetest() returns false > Else > Me.lblAnswered.Text = String.Format("{0} of 75 Questions > Answered (Not Answered: ", CStr(Me.questionsanswered())) > Dim myconnection As New > SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) > Dim cmd As New SqlCommand("", myconnection) > Dim qnumreader As SqlDataReader > Dim insertafter As Integer = > Me.Form.Controls.IndexOf(Me.lblAnswered) + 1 > For i As Integer = 1 To 75 > cmd.CommandText = String.Format("SELECT > questions.questionnumber FROM useranswers INNER JOIN questions ON > useranswers.questionid=questions.questionid WHERE > questions.questionnumber={0} AND useranswers.testid={1} AND > useranswers.userid={2}", i, CStr(Session("testid")), > CStr(Session("userid"))) > myconnection.Open() > qnumreader = cmd.ExecuteReader() > If Not qnumreader.Read() Then > Dim questionlink As New LinkButton() > questionlink.CausesValidation = False > questionlink.CommandArgument = i > questionlink.CssClass = "answerRED" > questionlink.EnableViewState = False > questionlink.Text = i & " " > AddHandler questionlink.Command, AddressOf > Me.QuestionLinkCommand > Me.Form.Controls.AddAt(insertafter, questionlink) > insertafter += 1 > End If > myconnection.Close() > Next > Me.lblCloseParen.Visible = True > End If > End Sub > > 'The eventhandler I want to use: > Private Sub QuestionLinkCommand(ByVal sender As Object, ByVal e As > System.Web.UI.WebControls.CommandEventArgs) > Dim myconnection As New > SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) > Dim cmd As New SqlCommand("SELECT subgroupid FROM questions WHERE > questionnumber=" & e.CommandArgument, myconnection) > myconnection.Open() > Session("subgroupid") = CInt(cmd.ExecuteScalar()) > myconnection.Close() > End Sub > > When I run my Application, the code in btnSubmit_Click works as I expect (or > at least it looks like it did), but when I click the dynamically created > LinkButtons (variable name questionlink), they postback but do not trigger > the QuestionLinkCommand method (the QuestionLinkCommand never gets executed > when I do a debug session). I cannot figure out why they are not triggering > this eventhandler, because I use AddHandler statements when creating the > LinkButtons, and the eventhandler has the correct signature. Is there > something I am doing wrong? Thanks. > -- > Nathan Sokalski > njsokal...@hotmail.comhttp://www.nathansokalski.com/ ASP.NET? You need to use AddHandler to add the event listener before the child control's event are handled (like in the Load event of the Page), otherwise the dynamic event won't exist when it's time to process it. By the way, if you search the newsgroups before posting you could find the answer on your own.... http://groups.google.com/group/microsoft.public.dotnet.framework.aspnet/search?hl=en&group=microsoft.public.dotnet.framework.aspnet&q=dynamic+control+event&qt_g=Search+this+group Thanks, Seth Rowe The only way I can come up with to run this code in the Load event is to
create a Hidden control and have btnSubmit (the Button I am clicking to cause the postback) assign it a value using JavaScript prior to doing the postback. This would work, but I was hoping to not need to have extra Controls for things like this. Is there a more efficient way, or am I stuck with using an extra Hidden control? Thanks. Show quote "rowe_newsgroups" <rowe_em***@yahoo.com> wrote in message news:1191321765.473720.158010@19g2000hsx.googlegroups.com... > On Oct 1, 9:38 pm, "Nathan Sokalski" <njsokal***@hotmail.com> wrote: >> I have a section of my code that dynamically creates LinkButtons to allow >> the user to go to the page containing a question they have not answered. >> The >> code that creates the LinkButton is called, as well as the AddHandler >> line >> (I ran a Debug and saw that it executes this code, and the links are >> displayed on the page afterwards). However, the eventhandler is not >> called >> when the LinkButton is clicked. Here is the code that dynamically >> generates >> the LinkButtons as well as the eventhandler I want to be called: >> >> 'The code that generates the LinkButtons: >> Private Sub btnSubmit_Click(ByVal sender As Object, ByVal e As >> System.Web.UI.ImageClickEventArgs) Handles btnSubmit.Click >> Me.submitanswers() >> If Me.completetest() Then >> 'Code that I use to update my database, not involved in this >> problem because Me.completetest() returns false >> Else >> Me.lblAnswered.Text = String.Format("{0} of 75 Questions >> Answered (Not Answered: ", CStr(Me.questionsanswered())) >> Dim myconnection As New >> SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) >> Dim cmd As New SqlCommand("", myconnection) >> Dim qnumreader As SqlDataReader >> Dim insertafter As Integer = >> Me.Form.Controls.IndexOf(Me.lblAnswered) + 1 >> For i As Integer = 1 To 75 >> cmd.CommandText = String.Format("SELECT >> questions.questionnumber FROM useranswers INNER JOIN questions ON >> useranswers.questionid=questions.questionid WHERE >> questions.questionnumber={0} AND useranswers.testid={1} AND >> useranswers.userid={2}", i, CStr(Session("testid")), >> CStr(Session("userid"))) >> myconnection.Open() >> qnumreader = cmd.ExecuteReader() >> If Not qnumreader.Read() Then >> Dim questionlink As New LinkButton() >> questionlink.CausesValidation = False >> questionlink.CommandArgument = i >> questionlink.CssClass = "answerRED" >> questionlink.EnableViewState = False >> questionlink.Text = i & " " >> AddHandler questionlink.Command, AddressOf >> Me.QuestionLinkCommand >> Me.Form.Controls.AddAt(insertafter, questionlink) >> insertafter += 1 >> End If >> myconnection.Close() >> Next >> Me.lblCloseParen.Visible = True >> End If >> End Sub >> >> 'The eventhandler I want to use: >> Private Sub QuestionLinkCommand(ByVal sender As Object, ByVal e As >> System.Web.UI.WebControls.CommandEventArgs) >> Dim myconnection As New >> SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) >> Dim cmd As New SqlCommand("SELECT subgroupid FROM questions WHERE >> questionnumber=" & e.CommandArgument, myconnection) >> myconnection.Open() >> Session("subgroupid") = CInt(cmd.ExecuteScalar()) >> myconnection.Close() >> End Sub >> >> When I run my Application, the code in btnSubmit_Click works as I expect >> (or >> at least it looks like it did), but when I click the dynamically created >> LinkButtons (variable name questionlink), they postback but do not >> trigger >> the QuestionLinkCommand method (the QuestionLinkCommand never gets >> executed >> when I do a debug session). I cannot figure out why they are not >> triggering >> this eventhandler, because I use AddHandler statements when creating the >> LinkButtons, and the eventhandler has the correct signature. Is there >> something I am doing wrong? Thanks. >> -- >> Nathan Sokalski >> njsokal...@hotmail.comhttp://www.nathansokalski.com/ > > You apparently aren't to familiar with the programming modal of > ASP.NET? You need to use AddHandler to add the event listener before > the child control's event are handled (like in the Load event of the > Page), otherwise the dynamic event won't exist when it's time to > process it. > > By the way, if you search the newsgroups before posting you could find > the answer on your own.... > > http://groups.google.com/group/microsoft.public.dotnet.framework.aspnet/search?hl=en&group=microsoft.public.dotnet.framework.aspnet&q=dynamic+control+event&qt_g=Search+this+group > > Thanks, > > Seth Rowe >
Show quote
On Oct 2, 11:55 am, "Nathan Sokalski" <njsokal***@hotmail.com> wrote: It seems to me after briefly reading your code segment you are only> The only way I can come up with to run this code in the Load event is to > create a Hidden control and have btnSubmit (the Button I am clicking to > cause the postback) assign it a value using JavaScript prior to doing the > postback. This would work, but I was hoping to not need to have extra > Controls for things like this. Is there a more efficient way, or am I stuck > with using an extra Hidden control? Thanks. > -- > Nathan Sokalski > njsokal...@hotmail.comhttp://www.nathansokalski.com/ > > "rowe_newsgroups" <rowe_em***@yahoo.com> wrote in message > > news:1191321765.473720.158010@19g2000hsx.googlegroups.com... > > > On Oct 1, 9:38 pm, "Nathan Sokalski" <njsokal***@hotmail.com> wrote: > >> I have a section of my code that dynamically creates LinkButtons to allow > >> the user to go to the page containing a question they have not answered. > >> The > >> code that creates the LinkButton is called, as well as the AddHandler > >> line > >> (I ran a Debug and saw that it executes this code, and the links are > >> displayed on the page afterwards). However, the eventhandler is not > >> called > >> when the LinkButton is clicked. Here is the code that dynamically > >> generates > >> the LinkButtons as well as the eventhandler I want to be called: > > >> 'The code that generates the LinkButtons: > >> Private Sub btnSubmit_Click(ByVal sender As Object, ByVal e As > >> System.Web.UI.ImageClickEventArgs) Handles btnSubmit.Click > >> Me.submitanswers() > >> If Me.completetest() Then > >> 'Code that I use to update my database, not involved in this > >> problem because Me.completetest() returns false > >> Else > >> Me.lblAnswered.Text = String.Format("{0} of 75 Questions > >> Answered (Not Answered: ", CStr(Me.questionsanswered())) > >> Dim myconnection As New > >> SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) > >> Dim cmd As New SqlCommand("", myconnection) > >> Dim qnumreader As SqlDataReader > >> Dim insertafter As Integer = > >> Me.Form.Controls.IndexOf(Me.lblAnswered) + 1 > >> For i As Integer = 1 To 75 > >> cmd.CommandText = String.Format("SELECT > >> questions.questionnumber FROM useranswers INNER JOIN questions ON > >> useranswers.questionid=questions.questionid WHERE > >> questions.questionnumber={0} AND useranswers.testid={1} AND > >> useranswers.userid={2}", i, CStr(Session("testid")), > >> CStr(Session("userid"))) > >> myconnection.Open() > >> qnumreader = cmd.ExecuteReader() > >> If Not qnumreader.Read() Then > >> Dim questionlink As New LinkButton() > >> questionlink.CausesValidation = False > >> questionlink.CommandArgument = i > >> questionlink.CssClass = "answerRED" > >> questionlink.EnableViewState = False > >> questionlink.Text = i & " " > >> AddHandler questionlink.Command, AddressOf > >> Me.QuestionLinkCommand > >> Me.Form.Controls.AddAt(insertafter, questionlink) > >> insertafter += 1 > >> End If > >> myconnection.Close() > >> Next > >> Me.lblCloseParen.Visible = True > >> End If > >> End Sub > > >> 'The eventhandler I want to use: > >> Private Sub QuestionLinkCommand(ByVal sender As Object, ByVal e As > >> System.Web.UI.WebControls.CommandEventArgs) > >> Dim myconnection As New > >> SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) > >> Dim cmd As New SqlCommand("SELECT subgroupid FROM questions WHERE > >> questionnumber=" & e.CommandArgument, myconnection) > >> myconnection.Open() > >> Session("subgroupid") = CInt(cmd.ExecuteScalar()) > >> myconnection.Close() > >> End Sub > > >> When I run my Application, the code in btnSubmit_Click works as I expect > >> (or > >> at least it looks like it did), but when I click the dynamically created > >> LinkButtons (variable name questionlink), they postback but do not > >> trigger > >> the QuestionLinkCommand method (the QuestionLinkCommand never gets > >> executed > >> when I do a debug session). I cannot figure out why they are not > >> triggering > >> this eventhandler, because I use AddHandler statements when creating the > >> LinkButtons, and the eventhandler has the correct signature. Is there > >> something I am doing wrong? Thanks. > >> -- > >> Nathan Sokalski > >> njsokal...@hotmail.comhttp://www.nathansokalski.com/ > > > You apparently aren't to familiar with the programming modal of > > ASP.NET? You need to use AddHandler to add the event listener before > > the child control's event are handled (like in the Load event of the > > Page), otherwise the dynamic event won't exist when it's time to > > process it. > > > By the way, if you search the newsgroups before posting you could find > > the answer on your own.... > > >http://groups.google.com/group/microsoft.public.dotnet.framework.aspn... > > > Thanks, > > > Seth Rowe creating one LinkButton. A simple approach would then be to add the LinkButton at design time with it's Visible property set to false and only show the LinkButton when it's necessary, and then hide it again in it's event handler. Also, be sure to set EnableViewState to true to preserve the Visible state on postbacks. Something like: /////////////// Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click Me.LinkButton1.Visible = True End Sub Protected Sub LinkButton1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles LinkButton1.Click Try '// My other code I want to run Finally Me.LinkButton1.Visible = False End Try End Sub ////////////// P.S. It's easier on the responders if you just provide a short, easy to read sample that demonstrates your problem. It's a pain to decipher out the unrelated junk to just get to the problem. Thanks, Seth Rowe > It seems to me after briefly reading your code segment you are only Nevermind, after rereading your post I now notice the For loop I> creating one LinkButton. previously missed so disregard my post. > P.S. It's easier on the responders if you just provide a short, easy As you can now see, useless clutter leads to pointless responses.> to read sample that demonstrates your problem. It's a pain to decipher > out the unrelated junk to just get to the problem. Thanks, Seth Rowe No, I am not just creating one LinkButton. If you missed it, the code that
creates the LinkButton is inside the loop that starts with: For i As Integer = 1 To 75 There may, in some cases, only be one LinkButton, but depending on the specific case there could be anywhere from 1-75 LinkButtons. If there were never going to be more than about 5, I would probably do what you said and simply change the properties, but that is unfortunately not the case here. Show quote "rowe_newsgroups" <rowe_em***@yahoo.com> wrote in message news:1191344444.881002.20590@n39g2000hsh.googlegroups.com... > On Oct 2, 11:55 am, "Nathan Sokalski" <njsokal***@hotmail.com> wrote: >> The only way I can come up with to run this code in the Load event is to >> create a Hidden control and have btnSubmit (the Button I am clicking to >> cause the postback) assign it a value using JavaScript prior to doing the >> postback. This would work, but I was hoping to not need to have extra >> Controls for things like this. Is there a more efficient way, or am I >> stuck >> with using an extra Hidden control? Thanks. >> -- >> Nathan Sokalski >> njsokal...@hotmail.comhttp://www.nathansokalski.com/ >> >> "rowe_newsgroups" <rowe_em***@yahoo.com> wrote in message >> >> news:1191321765.473720.158010@19g2000hsx.googlegroups.com... >> >> > On Oct 1, 9:38 pm, "Nathan Sokalski" <njsokal***@hotmail.com> wrote: >> >> I have a section of my code that dynamically creates LinkButtons to >> >> allow >> >> the user to go to the page containing a question they have not >> >> answered. >> >> The >> >> code that creates the LinkButton is called, as well as the AddHandler >> >> line >> >> (I ran a Debug and saw that it executes this code, and the links are >> >> displayed on the page afterwards). However, the eventhandler is not >> >> called >> >> when the LinkButton is clicked. Here is the code that dynamically >> >> generates >> >> the LinkButtons as well as the eventhandler I want to be called: >> >> >> 'The code that generates the LinkButtons: >> >> Private Sub btnSubmit_Click(ByVal sender As Object, ByVal e As >> >> System.Web.UI.ImageClickEventArgs) Handles btnSubmit.Click >> >> Me.submitanswers() >> >> If Me.completetest() Then >> >> 'Code that I use to update my database, not involved in >> >> this >> >> problem because Me.completetest() returns false >> >> Else >> >> Me.lblAnswered.Text = String.Format("{0} of 75 Questions >> >> Answered (Not Answered: ", CStr(Me.questionsanswered())) >> >> Dim myconnection As New >> >> SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) >> >> Dim cmd As New SqlCommand("", myconnection) >> >> Dim qnumreader As SqlDataReader >> >> Dim insertafter As Integer = >> >> Me.Form.Controls.IndexOf(Me.lblAnswered) + 1 >> >> For i As Integer = 1 To 75 >> >> cmd.CommandText = String.Format("SELECT >> >> questions.questionnumber FROM useranswers INNER JOIN questions ON >> >> useranswers.questionid=questions.questionid WHERE >> >> questions.questionnumber={0} AND useranswers.testid={1} AND >> >> useranswers.userid={2}", i, CStr(Session("testid")), >> >> CStr(Session("userid"))) >> >> myconnection.Open() >> >> qnumreader = cmd.ExecuteReader() >> >> If Not qnumreader.Read() Then >> >> Dim questionlink As New LinkButton() >> >> questionlink.CausesValidation = False >> >> questionlink.CommandArgument = i >> >> questionlink.CssClass = "answerRED" >> >> questionlink.EnableViewState = False >> >> questionlink.Text = i & " " >> >> AddHandler questionlink.Command, AddressOf >> >> Me.QuestionLinkCommand >> >> Me.Form.Controls.AddAt(insertafter, questionlink) >> >> insertafter += 1 >> >> End If >> >> myconnection.Close() >> >> Next >> >> Me.lblCloseParen.Visible = True >> >> End If >> >> End Sub >> >> >> 'The eventhandler I want to use: >> >> Private Sub QuestionLinkCommand(ByVal sender As Object, ByVal e As >> >> System.Web.UI.WebControls.CommandEventArgs) >> >> Dim myconnection As New >> >> SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) >> >> Dim cmd As New SqlCommand("SELECT subgroupid FROM questions >> >> WHERE >> >> questionnumber=" & e.CommandArgument, myconnection) >> >> myconnection.Open() >> >> Session("subgroupid") = CInt(cmd.ExecuteScalar()) >> >> myconnection.Close() >> >> End Sub >> >> >> When I run my Application, the code in btnSubmit_Click works as I >> >> expect >> >> (or >> >> at least it looks like it did), but when I click the dynamically >> >> created >> >> LinkButtons (variable name questionlink), they postback but do not >> >> trigger >> >> the QuestionLinkCommand method (the QuestionLinkCommand never gets >> >> executed >> >> when I do a debug session). I cannot figure out why they are not >> >> triggering >> >> this eventhandler, because I use AddHandler statements when creating >> >> the >> >> LinkButtons, and the eventhandler has the correct signature. Is there >> >> something I am doing wrong? Thanks. >> >> -- >> >> Nathan Sokalski >> >> njsokal...@hotmail.comhttp://www.nathansokalski.com/ >> >> > You apparently aren't to familiar with the programming modal of >> > ASP.NET? You need to use AddHandler to add the event listener before >> > the child control's event are handled (like in the Load event of the >> > Page), otherwise the dynamic event won't exist when it's time to >> > process it. >> >> > By the way, if you search the newsgroups before posting you could find >> > the answer on your own.... >> >> >http://groups.google.com/group/microsoft.public.dotnet.framework.aspn... >> >> > Thanks, >> >> > Seth Rowe > > It seems to me after briefly reading your code segment you are only > creating one LinkButton. A simple approach would then be to add the > LinkButton at design time with it's Visible property set to false and > only show the LinkButton when it's necessary, and then hide it again > in it's event handler. Also, be sure to set EnableViewState to true to > preserve the Visible state on postbacks. > > Something like: > > /////////////// > Protected Sub Button1_Click(ByVal sender As Object, ByVal e As > System.EventArgs) Handles Button1.Click > Me.LinkButton1.Visible = True > End Sub > > Protected Sub LinkButton1_Click(ByVal sender As Object, ByVal e As > System.EventArgs) Handles LinkButton1.Click > Try > '// My other code I want to run > Finally > Me.LinkButton1.Visible = False > End Try > End Sub > ////////////// > > P.S. It's easier on the responders if you just provide a short, easy > to read sample that demonstrates your problem. It's a pain to decipher > out the unrelated junk to just get to the problem. > > Thanks, > > Seth Rowe > Nathan,
I gave you a link for a windowsform, because you were talking about a form in my idea, but beside that there is as well a sample about a page. This is a kind of calendar finding a date on a webpage. http://www.vb-tips.com/ASPNetDynamicButton.aspx Cor Nathan Sokalski wrote:
> I have a section of my code that dynamically creates LinkButtons to <snip>> allow the user to go to the page containing a question they have not > answered. The code that creates the LinkButton is called, as well as > the AddHandler line (I ran a Debug and saw that it executes this > code, and the links are displayed on the page afterwards). However, > the eventhandler is not called when the LinkButton is clicked. Here > is the code that dynamically generates the LinkButtons as well as the > eventhandler I want to be called: You have to tell it to AutoPostBack. Incidentally, you can use "With" to save a bit of typing:- > If Not qnumreader.Read() Then With questionlink> Dim questionlink As New LinkButton() .CausesValidation = False .CommandArgument = i .CssClass = "answerRED" .EnableViewState = False .Text = i & " " .AutoPostBack = True End With > AddHandler questionlink.Command, AddressOf HTH> Me.QuestionLinkCommand > Me.Form.Controls.AddAt(insertafter, questionlink) > insertafter += 1 > End If Andrew This is a LinkButton, it does not need or have an AutoPostBack property. And
take note that in my original post I stated that it does do a PostBack, it just doesn't trigger the eventhandler I attempted to assign it. Show quote "Andrew Morton" <a**@in-press.co.uk.invalid> wrote in message news:u3WOjJOBIHA.5360@TK2MSFTNGP03.phx.gbl... > Nathan Sokalski wrote: >> I have a section of my code that dynamically creates LinkButtons to >> allow the user to go to the page containing a question they have not >> answered. The code that creates the LinkButton is called, as well as >> the AddHandler line (I ran a Debug and saw that it executes this >> code, and the links are displayed on the page afterwards). However, >> the eventhandler is not called when the LinkButton is clicked. Here >> is the code that dynamically generates the LinkButtons as well as the >> eventhandler I want to be called: > > <snip> > > You have to tell it to AutoPostBack. Incidentally, you can use "With" to > save a bit of typing:- > >> If Not qnumreader.Read() Then >> Dim questionlink As New LinkButton() > With questionlink > .CausesValidation = False > .CommandArgument = i > .CssClass = "answerRED" > .EnableViewState = False > .Text = i & " " > .AutoPostBack = True > End With >> AddHandler questionlink.Command, AddressOf >> Me.QuestionLinkCommand >> Me.Form.Controls.AddAt(insertafter, questionlink) >> insertafter += 1 >> End If > > HTH > > Andrew > Nathan Sokalski wrote:
> This is a LinkButton, it does not need or have an AutoPostBack My mistake.> property. > And take note that in my original post I stated that it What errors are highlighted if you use Option Strict On? I ask because in > does do a PostBack, it just doesn't trigger the eventhandler I > attempted to assign it. the handler you have > Dim cmd As New SqlCommand("SELECT subgroupid FROM questions which would give an error about not being able to use & with the > WHERE questionnumber=" & e.CommandArgument, myconnection) e.CommandArgument /object/, so there may be other errors you haven't spotted. Andrew asp.net pages are stateless. you rendered the linkbuton and added to
handler on the click event. but when the user links on th button and the asp.net is run again, the page does create th linkbutton and add the handler, so the event is ignored. your code needs to remember it added the linkbutton and handler during previous postback and recreate the linkbutton and handler during the oninit event. you can save your state in session or viewstate. -- bruce (sqlwork.com) Nathan Sokalski wrote: Show quote > I have a section of my code that dynamically creates LinkButtons to allow > the user to go to the page containing a question they have not answered. The > code that creates the LinkButton is called, as well as the AddHandler line > (I ran a Debug and saw that it executes this code, and the links are > displayed on the page afterwards). However, the eventhandler is not called > when the LinkButton is clicked. Here is the code that dynamically generates > the LinkButtons as well as the eventhandler I want to be called: > > > 'The code that generates the LinkButtons: > Private Sub btnSubmit_Click(ByVal sender As Object, ByVal e As > System.Web.UI.ImageClickEventArgs) Handles btnSubmit.Click > Me.submitanswers() > If Me.completetest() Then > 'Code that I use to update my database, not involved in this > problem because Me.completetest() returns false > Else > Me.lblAnswered.Text = String.Format("{0} of 75 Questions > Answered (Not Answered: ", CStr(Me.questionsanswered())) > Dim myconnection As New > SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) > Dim cmd As New SqlCommand("", myconnection) > Dim qnumreader As SqlDataReader > Dim insertafter As Integer = > Me.Form.Controls.IndexOf(Me.lblAnswered) + 1 > For i As Integer = 1 To 75 > cmd.CommandText = String.Format("SELECT > questions.questionnumber FROM useranswers INNER JOIN questions ON > useranswers.questionid=questions.questionid WHERE > questions.questionnumber={0} AND useranswers.testid={1} AND > useranswers.userid={2}", i, CStr(Session("testid")), > CStr(Session("userid"))) > myconnection.Open() > qnumreader = cmd.ExecuteReader() > If Not qnumreader.Read() Then > Dim questionlink As New LinkButton() > questionlink.CausesValidation = False > questionlink.CommandArgument = i > questionlink.CssClass = "answerRED" > questionlink.EnableViewState = False > questionlink.Text = i & " " > AddHandler questionlink.Command, AddressOf > Me.QuestionLinkCommand > Me.Form.Controls.AddAt(insertafter, questionlink) > insertafter += 1 > End If > myconnection.Close() > Next > Me.lblCloseParen.Visible = True > End If > End Sub > > 'The eventhandler I want to use: > Private Sub QuestionLinkCommand(ByVal sender As Object, ByVal e As > System.Web.UI.WebControls.CommandEventArgs) > Dim myconnection As New > SqlConnection(System.Configuration.ConfigurationManager.AppSettings("connectionstring")) > Dim cmd As New SqlCommand("SELECT subgroupid FROM questions WHERE > questionnumber=" & e.CommandArgument, myconnection) > myconnection.Open() > Session("subgroupid") = CInt(cmd.ExecuteScalar()) > myconnection.Close() > End Sub > > > When I run my Application, the code in btnSubmit_Click works as I expect (or > at least it looks like it did), but when I click the dynamically created > LinkButtons (variable name questionlink), they postback but do not trigger > the QuestionLinkCommand method (the QuestionLinkCommand never gets executed > when I do a debug session). I cannot figure out why they are not triggering > this eventhandler, because I use AddHandler statements when creating the > LinkButtons, and the eventhandler has the correct signature. Is there > something I am doing wrong? Thanks.  |
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