I must be doing something wrong. I can't seem to execute my CustomValidator's ServerValidate method.
I've got a Visual Basic ASP.NET page with a CustomValidator...
<asp:TextBox ID="TextBox1" runat="server" />
<asp:CustomValidator ID="CustomValidator1" runat="server"
ControlToValidate="TextBox1"
ErrorMessage="Friendly message goes here."
Display="Dynamic" />
<asp:Button ID="Button1" runat="server"
Text="Submit"
CausesValidation="True" />
For this test, I've got the validation set to always fail...
Sub CustomValidator1_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs) Handles CustomValidator1.ServerValidate
args.IsValid = False
End Sub
But, when the button is clicked, the CustomValidator1_ServerValidate() method never executes!
Protected Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Page.Validate()
If Page.IsValid Then
'it executes the code here!
End If
End Sub
Not even if I explicitly validate that control...
CustomValidator1.Validate() 'does nothing?
What am I doing wrong?
Add the property:
ValidateEmptyText="True"
Are you putting the validator control submit button in the same validation group?
Firstly, You seem to be missing the OnServerValidate attribute in your markup above.
Secondly, I would check to ensure that CustomValidator1_ServerValidate has been set up as an eventhandler for the ServerValidate event for Textbox1. I have had occasions where I have changed the name of the validate method in the markup and code-behind, but the IDE has not auto updated the subscribing method name passed to the eventhandler delegate
I know it's a daft question (or might sound like it!). But have you actually entered or changed the value in the textbox? I think the validator won't trigger without the contents of the textbox changing.
Related
So I wanted to make my textbox in asp.net to postback every time a text it typed onto it but i cant seem to figure out how. Does any one knows? here is the code of the event handler
Private Sub TextBox2_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles txtFiltrarNomeUtente.TextChanged
If chkFiltroUtente.Checked And Me.cbxLocal.Text <> "" Then
Me.loadFormInfo()
End If
End Sub
and the textbox
<asp:TextBox ID="txtFiltrarNomeUtente" runat="server" AutoPostBack="true">
so any ideas on how to do it? thanks
You need to add the OnTextChanged event to TextBox txtFiltrarNomeUtente.
<asp:TextBox ID="txtFiltrarNomeUtente" runat="server" AutoPostBack="true" OnTextChanged="TextBox2_TextChanged"></asp:TextBox>
I have encountered a problem with a page we have, and have narrowed down a sample like so:
ASPX:
<div>
<asp:DropDownList ID="ddlSomething" runat="server"
CausesValidation="true" AutoPostBack="true">
<asp:ListItem>One</asp:ListItem>
<asp:ListItem>Two</asp:ListItem>
</asp:DropDownList>
<asp:Button ID="btnFilter" runat="server" Text="Filter" />
</div>
Code:
Partial Class ValTest
Inherits System.Web.UI.Page
Protected Sub btnFilter_Click(sender As Object, e As EventArgs) Handles btnFilter.Click
BindGrid()
End Sub
Protected Sub ddlSomething_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ddlSomething.SelectedIndexChanged
BindGrid()
End Sub
Private Sub BindGrid()
If (Page.IsValid) Then
'Do something that takes a little time here
System.Threading.Thread.Sleep(2000)
Response.Write("Done")
End If
End Sub
End Class
Note that the dropdown list has autopostback set to true and causesvalidation set to true.
Now, if I change the dropdown list and let the page load, it works without issue. Similarly, if I just click the button, then it works ok. However, if I change the dropdown list and then, before the page has totally reloaded, click the button, then I get this error:
Page.IsValid cannot be called before validation has taken place. It should be queried in the event handler for a control that has CausesValidation=True and initiated the postback, or after a call to Page.Validate.
Now, I can fix this by putting a Page.Validate() in front of my check for Page.IsValid, however I am curious if anybody can explain why this is happening. I am expecting two postbacks to have been sent, each causing validation, and each should have worked...
ASP.net 4.5, just in case it makes a difference.
I have the following button:
<asp:ImageButton ID="imgbtnEditInfo" runat="server" ImageUrl="~/images/EditInformation.png" AlternateText="EditInformation" CommandName="EditDetails" CommandArgument="<%# Container.DataItemIndex %>" OnClick="lnkEdit_Click" Enabled="true" />
I have the following method but looks like it is not hitting the method:
Protected Sub lnkEdit_Click(ByVal sender As Object, ByVal e As System.EventArgs)
End Sub
Wondering if I am missing something. I put a breakpoint on the Protected Sub lnkEdit_Click but on click of the imagebutton I do not go there.
You're working with Data Controls (GridView or DataList etc). To respond to the button/linkbutton/imagebutton events, you must have to handle the parent - data control's events.
Without seeing more of your page it is hard to say. A couple things to check:
Is the ImageButton inside a <form runat="server">?
Have you compared your page to the VB sample at ImageButton Class to see if anything might have been missed?
I have an ASP.Net page, which displays a list of options to the user. When they select from the list, it does a post back and queries a sql server. The results are displayed in a listview below the options in an update panel. Below is a snippet of the ItemTemplate:
<asp:LinkButton Text="Save IT" OnCommand="SaveIt" CommandArgument="<%# Container.DataItemIndex %>" runat="server" />
The DataItemIndex does not appear, so my commandargument is empty. However, the object sender is the button, which shows the item.
Why is the index item not appearing in the CommandArgument?
Could it be the post back? If so, why would it be the post back? Is there a way around it?
Edit:
Sorry, from my attempts to solve it before, I posted bad code, but it still isn't appearing.
Resolution:
I found another work around in that the sender of the OnCommand is the link button, which has the CommandArgument. I will chalk this issue up to be an issue with multiple postbacks and javascript.
You can't use the <%= %> syntax inside properties on a tag with a runat="server" attribute. I'm surprised the code will even run. :)
UPDATE:
You probably want to use the ItemDataBound event on the repeater, find the linkbutton and set the CommandArgument property.
Not very elegant, but here's a VB.NET sample.
Private Sub Repeater1_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles Repeater1.ItemDataBound
Select Case e.Item.ItemType
Case ListItemType.Item, ListItemType.AlternatingItem
Dim b As LinkButton = e.Item.FindControl("btn")
b.CommandArgument = e.Item.ItemIndex
b.DataBind()
End Select
End Sub
You're not setting it
You possibly want
<%# Container.DataItemIndex %>
or
<%= Container.DataItemIndex %>
:)
Try
<asp:LinkButton Text="Save IT" OnCommand="SaveIt" CommandArgument="<%# Container.DataItemIndex %>" runat="server" />
You were missing the "#" sign.
This site really helped me with this problem: http://forums.asp.net/t/1671316.aspx
The issue I ran into was that I was being passed null arguments in the commandargument when I clicked on the button a second time. As the post above explains, this is because commandargument is only set in the databind event. So, to fix this, include a databind event in the page_load sub
Ex. (VB)
Private Sub BindSelectButtons()
'Purpose: bind the data to the select buttons for commandargument to be used
Dim i As Integer
For i = 0 To gridview1.Rows.Count - 1
gridview1.Rows(i).Cells(8).FindControl("btnID").DataBind()
Next
End Sub
Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
'Rebind select buttons so that the commandargument refreshes
BindSelectButtons()
End Sub
Make sure View State is enabled
e.Row.EnableViewState = true;
How do I enable a check_change for a checkbox in VB.
Here is what I have so far.
Code Behind:
Protected Sub CheckBoxCash_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles CheckBoxCash.CheckedChanged
Label1.Text = "Cash"
End Sub
Front end code:
<asp:Label ID="Label1" runat="server" Text="Empty"></asp:Label>
<asp:CheckBox ID="CheckBoxPoints" runat="server" Checked="True" />
It looks like you're not doing anything that specifically requires a postback here. In that case, I'd skip the postback entirely an do it more like this:
<asp:Label ID="Label1" runat="server" Text="Empty"></asp:Label>
<asp:CheckBox ID="CheckBoxPoints" runat="server" Checked="True" onclick="document.getElementById('Label1').value = 'Cash';" />
Of course, that's the simple version. Production code would also involve checking the label's clientid property in case these controls ever end up inside a naming container (like an asp:panel or gridview). I'd also look for a fallback for when javascript is not enabled, but in this case the Check_Changed server event depends on javascript to fire anyway.
I figured it out, I forgot to set the postback to true