On my web form I have a TextBox which I want to perform custom validation on:
<asp:TextBox ID="tbDate" runat="server"></asp:TextBox>
<asp:Button ID="btnSubmit" runat="server" Text="Submit" />
<asp:CustomValidator runat="server" ID="valDate" ControlToValidate="tbDate" onServerValidate="valDate_ServerValidate" ValidateEmptyText="true" ></asp:CustomValidator>
In my code behind, I set the date TextBox's Text in Page_Load, and I have a validation function:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
tbDate.Text = DateTime.Today.ToShortDateString
End Sub
Protected Sub valDate_ServerValidate(source As Object, args As ServerValidateEventArgs)
Dim newDate As DateTime
args.IsValid = DateTime.TryParse(args.Value, newDate)
End Sub
Here's the problem: If I enter a value in the textbox and click the submit button (or hit Enter), the validation function doesn't receive the value that I typed. Instead, inside valDate_ServerValidate, args.Value is set to the textbox's initial value that was set in Page_Load. What's going on here?
You are always overwriting the value, so change
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
tbDate.Text = DateTime.Today.ToShortDateString
End Sub
to
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then tbDate.Text = DateTime.Today.ToShortDateString
End Sub
Related
I've placed some controls in a panels. When the page postback, I'm trying to retrieve the posted values, but only the older value seems to be there.
Protected Sub btnSubmit_Click(sender As Object, e As EventArgs) Handles btnSubmit.Click
Dim _txtFName As TextBox = FindControl("editNamePanel").FindControl("txtFName")
Dim _txtMName As TextBox = FindControl("editNamePanel").FindControl("txtMName")
Dim _txtLName As TextBox = FindControl("editNamePanel").FindControl("txtLName")
End Sub
Even when I hover over the e EventArgs is null. Am I missing something?
EDIT
I'm getting new values when I put the above code in the page load event handler
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
Handles Me.Load
If Page.IsPostBack Then
'The above code here ...
End If
End Sub
Thank for helping
In your aspx
<asp:Panel ID="editNamePanel" runat="server">
<asp:TextBox ID="txtFName" runat="server"></asp:TextBox>
<asp:TextBox ID="txtMName" runat="server"></asp:TextBox>
<asp:TextBox ID="txtLName" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" />
</asp:Panel>
In your code behind
Protected Sub Button1_Click(sender As Object, e As System.EventArgs) Handles Button1.Click
Dim _txtFName As TextBox = txtFName
Dim _txtMName As TextBox = txtMName
Dim _txtLName As TextBox = txtLName
End Sub
I have this in my code behind on my Asp.Net page
Public Class display
Inherits System.Web.UI.Page
Protected Property pID As String
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If (Request.QueryString("id") = "") Then
Response.Redirect("Default.aspx")
Else
pID = Request.QueryString("id")
End If
End Sub
End Class
Now, I want to get the ID to influence items in the code infront when the page loads, so i added this:
<asp:Label ID="Label1" runat="server" Text='<%# pID %>'></asp:Label>
as a test object. when ran 'Label1' is just a blank span. what am i doing wrong?
You don't need <%# pID %>, Just use
Label1.Text = pID
As Label1 is a server control and is accessible in page load.
Change your code as
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If (Request.QueryString("id") = "") Then
Response.Redirect("Default.aspx")
Else
pID = Request.QueryString("id")
Label1.Text = pID
End If
End Sub
EDIT:
I would suggest you to use LinkButton
<asp:LinkButton OnClick="LinkButton_Click" />
CS Code
Sub LinkButton_Click(sender As Object, e As EventArgs)
Response.Redirect(piccom.displayLink(pID))
End Sub
Keep things simple and organized like #saptal is suggesting.
pID = Request.QueryString("id")
Label1.Text = pID
If you need an anchor control you can use the HyperLink control like this on your markup:
<asp:HyperLink ID ="genHyperLink" CssClass="genLink" runat="server" />
code behind:
genHyperLink.NavigateUrl = piccom.displayLink(pID)
I need to bind title to the datasource so the web page title will show depends on the data in datasource.
When i'm using the Formview and the hiddenfield to get the data from datasource the code cannot compile
How to create a script that the pagetitle can be display based on the data in datasource?
<Script runat = "server">
Protected sub Page_load(Byval sender as Object, Byval e As System.eventargs)
Title = Hiddenfield1.value
End sub
</Script>
<asp:FormView ID="FormView2" runat="server" DataSourceID="SqlDataSource1">
<ItemTemplate>
<asp:HiddenField ID="HiddenField1" runat="server" Value= '<%#eval ("PageTitleConstruct") %>' />
</ItemTemplate>
</asp:FormView>
Try this
Sub FormView2_ItemCreated(ByVal sender As Object, ByVal e As EventArgs)
Dim HiddenField1 As HiddenField = CType(FormView2.FindControl("HiddenField1"), HiddenField)
Page.Title = HiddenField1.Value;
End Sub
In the Page_Load function. You'll have to get the value earlier than you are though.
Page.Title = value here.
You should be able to listen for the ItemCreated event, and set the title in that callback.
I have tried the script, but when using the
FormView2_ItemCreated(ByVal sender As Object, ByVal e As EventArgs)
Dim HiddenField1 As HiddenField = CType(FormView2.FindControl("HiddenField1"), HiddenField)
Page.Title = HiddenField1.Value;
End Sub
The page.title value only nothing
But correct if i change the Event to
Private Sub FormView2_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles FormView2.Load
Dim hiddenfield1 As HiddenField = CType(FormView2.FindControl("hiddenfield1"), HiddenField)
Page.Title = hiddenfield1.Value
End Sub
I am trying to allow a user to select a role on createuserwizard from a dropdownlist containing all roles. I dont get errors but user always added to the "Offering Rooms" role no matter what dropdownlist item is selected.
Code:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
roleDropDownList = RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("RoleDropDownList")
roleDropDownList.DataSource = Roles.GetAllRoles()
roleDropDownList.DataBind()
End Sub
Protected Sub RegisterUser_CreatedUser(ByVal sender As Object, ByVal e As EventArgs) Handles RegisterUser.CreatedUser
Roles.AddUserToRole(RegisterUser.UserName, roleDropDownList.SelectedValue)
End Sub
Markup:
<asp:DropDownList ID="RoleDropDownList" runat="server">
</asp:DropDownList>
Html:
<option value="Offering Rooms">Offering Rooms</option>
<option value="Seeking Rooms">Seeking Rooms</option>
You need to add check if this is post back and not bind again:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
roleDropDownList = RegisterUser.CreateUserStep.ContentTemplateContainer.FindControl("RoleDropDownList")
roleDropDownList.DataSource = Roles.GetAllRoles()
roleDropDownList.DataBind()
End If
End Sub
I have 2 radio buttons on a simple web page and If I click one of them the other should be false(i.e checked=false) but it's not working Can anyone point me the mistake I'm doing.I knew it's a silly one but I need to know what's going on?
Here are the radio buttons:
<asp:RadioButton ID="Rb1" runat="server" Text=""/>
<asp:RadioButton ID="Rb2" runat="server" Text=""/>
Onchecked changed event:
Protected Sub Rb1_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles Rb1.CheckedChanged
Rb2.Checked = False
End Sub
Protected Sub Rb2_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles Rb2.CheckedChanged
Rb1.Checked = False
End Sub
You have to set GroupName property and AutoPostBack=True.