Custom validator inside DataGrid

[Stephan Bour]

Hi,
I need to validate a text box in a datagrid nested inside a datalist. All I
need is to validate that any text is entered in the textbox. However, a
requiredfieldva lidator would not do because I want to perform the validation
only on the datagrid rows where a check box is checked.

Part of the datagrid:

<asp:TemplateCo lumn HeaderText="C #">
<ItemTemplate >
<asp:TextBox Width="50" MaxLenght="5" TextMode="Singl eLine" ID="Cnumber"
runat="server" />
<asp:CustomVali dator id="CNumNotNull "
ControlToValida te="Cnumber"
Display="Static "
InitialValue=""
OnServerValidat e = "Validate"
ErrorMessage="P lease enter a C Number"
runat="server">
*
</asp:CustomValid ator>
</ItemTemplate>
</asp:TemplateCol umn>

<asp:TemplateCo lumn HeaderText="Sel ect" ItemStyle-HorizontalAlign ="Center">
<ItemTemplate >
<asp:CheckBox ID="chkSelectIn Progress" runat="server" />
</ItemTemplate>
</asp:TemplateCol umn>

However, the "Validate" script doesn't appear to run:

void Validate (object source,
System.Web.UI.W ebControls.Serv erValidateEvent Args e) {
e.IsValid = false;

DataGrid GridHolder;
foreach (DataListItem NewListItem in InProgressList. Items) {
GridHolder = NewListItem.Fin dControl("InPro gressGrid") as DataGrid;
foreach (DataGridItem NewGridItem in GridHolder.Item s) {
CheckBox chkSelectInProg ress =
(CheckBox)NewGr idItem.Cells[6].Controls[1];
TextBox CNumber = (TextBox)NewGri dItem.Cells[5].Controls[1];

if (chkSelectInPro gress.Checked == true) {
String Test = e.Value;
if (Test.Length > 0) {
e.IsValid = true;
}
}
}
}
}

Any suggestions?
Thanks,
Stephan.

[Peter Blum]

I can offer you a commercial solution that includes full client-side
validation support. My product, "Profession al Validation And More", is a
replacement to Microsoft's validators that overcomes its many limitations.
What you've asked for is one of the most important limitations: the ability
to have a validator disable itself when some other condition (like a
checkbox) isn't right. All the validators in Professional Validation And
More include the Enabler property, where you define the condition.

Here's what the ASP.NET text of my RequiredTextVal idator with the Enabler on
the CheckBox would look like:
<asp:checkbox id=checkbox1 runat=server>Ch eckMe</asp:checkbox>
<asp:textbox id=textbox1 runat=server />
<vam:RequiredTe xtValidator id=RTV1 runat=server ErrorMessage="R equired"
ControlIDToEval uate="TextBox1" >
<EnablerContain er>
<vam:CheckState Condition ControlIDToEval uate="checkbox1 " Checked=true
/>
</EnablerContaine r>
</vam:RequiredTex tValidator>

Aside from the Enabler, you get client-side validation on many more
browsers, 17 validators, and Validation Groups. Learn more at
http://www.peterblum.com/vam/home.aspx.

--- Peter Blum
www.PeterBlum.com
Email: PL****@PeterBlu m.com

"Stephan Bour" <sb***@niaid.ni h.gov> wrote in message
news:BC2D800A.D DD8%sb***@niaid .nih.gov...

Hi,
I need to validate a text box in a datagrid nested inside a datalist. All I need is to validate that any text is entered in the textbox. However, a
requiredfieldva lidator would not do because I want to perform the validation only on the datagrid rows where a check box is checked.

Part of the datagrid:

<asp:TemplateCo lumn HeaderText="C #">
<ItemTemplate >
<asp:TextBox Width="50" MaxLenght="5" TextMode="Singl eLine" ID="Cnumber"
runat="server" />
<asp:CustomVali dator id="CNumNotNull "
ControlToValida te="Cnumber"
Display="Static "
InitialValue=""
OnServerValidat e = "Validate"
ErrorMessage="P lease enter a C Number"
runat="server">
*
</asp:CustomValid ator>
</ItemTemplate>
</asp:TemplateCol umn>

<asp:TemplateCo lumn HeaderText="Sel ect" ItemStyle-HorizontalAlign ="Center"> <ItemTemplate >
<asp:CheckBox ID="chkSelectIn Progress" runat="server" />
</ItemTemplate>
</asp:TemplateCol umn>

However, the "Validate" script doesn't appear to run:

void Validate (object source,
System.Web.UI.W ebControls.Serv erValidateEvent Args e) {
e.IsValid = false;

DataGrid GridHolder;
foreach (DataListItem NewListItem in InProgressList. Items) {
GridHolder = NewListItem.Fin dControl("InPro gressGrid") as DataGrid; foreach (DataGridItem NewGridItem in GridHolder.Item s) {
CheckBox chkSelectInProg ress =
(CheckBox)NewGr idItem.Cells[6].Controls[1];
TextBox CNumber = (TextBox)NewGri dItem.Cells[5].Controls[1];
if (chkSelectInPro gress.Checked == true) {
String Test = e.Value;
if (Test.Length > 0) {
e.IsValid = true;
}
}
}
}
}

Any suggestions?
Thanks,
Stephan.