Inserting Controls Dynamically - with Validators Also Added Dynamically

[Jeffrey Todd]

I have successfully created functionality that mostly models what I'm trying
to do - which is dynamically insert controls into a user control (ascx), and
insert validation controls, also dynamically, for some of the inserted
controls.

The controls (e.g., textBoxes) get created correctly and viewstate is
maintained across postbacks, etc - BUT there is an issue with the validation
controls.

The validation controls, themselves are working - EXCEPT that
1. They do their job only during a Postback (i.e., the page must actually
post back in order for validation to occur); that is, client-side validation
is not happening (i.e., it's not preventing a postback when it should).

2. The validation summary control is apparently not working at all. It
should pop up a message box, but it does nothing.

My question is how to resolve/fix these two issues: I want the validation to
occur client-side (in addition to the default server-side validation), and I
want the validation summary control to work.

FWIW here is my code:
Hosting ASCX:
<%@ Control CodeBehind="ucForm1.ascx.cs" Language="c#"
AutoEventWireup="false" Inherits="MyAssembly.ucForm1" %>
<asplaceHolder id="FormPlaceHolder" runat="server"></asplaceHolder>
<table align="center"><tr><td><asp:Button id="btnSave"
EnableViewState="false" CommandName="btnSave" Visible="true" Width="100px"
runat="server" Text="Save"></asp:Button></td></tr></table>

Relevant Code Behind:
The method named InsertDynamicControls() is called from the OnInit() event
ucForm1.

private void InsertDynamicControls () {
Literal spacer = new Literal();
spacer.Text = "&nbsp;";

// This is where I have all the logic that inserts the FORM controls into
the Placeholder
string s = "<table border=2><tr><td>Yo</td><tr><td>";
s += "<asp:TextBox id=\"txtBox1\" EnableViewState=\"false\"
Width=\"300px\" runat=\"server\"></asp:TextBox>";
s += "</td></tr></tr><tr><td>Some Value</td></tr><tr><td>Other
Value</td></tr></table>";

System.Web.UI.Control c = ParseControl(s);

FormPlaceHolder.Controls.Add(c);

RequiredFieldValidator requiredFieldValidator = new
RequiredFieldValidator();
requiredFieldValidator.ControlToValidate = "txtBox1";
requiredFieldValidator.EnableClientScript = true;
requiredFieldValidator.Enabled = true;
requiredFieldValidator.ErrorMessage = "Yo - You gotta enter something
man!";
requiredFieldValidator.ID = "RequiredFieldValidator_Title";
requiredFieldValidator.Text = "*";
requiredFieldValidator.EnableClientScript = true;

FormPlaceHolder.Controls.Add(spacer);

FormPlaceHolder.Controls.Add(requiredFieldValidator);

ValidationSummary validationSummary = new ValidationSummary();
validationSummary.DisplayMode =
System.Web.UI.WebControls.ValidationSummaryDisplayMode.BulletList;
validationSummary.ShowMessageBox = true;
validationSummary.HeaderText = "These things must be fixed before you can
proceed:";
validationSummary.ShowSummary = false;
validationSummary.ID = "validSummary1";
validationSummary.EnableClientScript = true;

FormPlaceHolder.Controls.Add(spacer);
FormPlaceHolder.Controls.Add(validationSummary);
}

Thanks!

 

[Peter Blum]

The overall code looks fine, except you are adding one control (spacer) in
multiple places (which I thought was illegal). So I wonder if the
WebUIValidation.js script file simply isn't loading.

Take a look at this thread for several ideas:
http://forums.asp.net/739537/ShowPost.aspx

--- Peter Blum
www.PeterBlum.com
Email: (e-mail address removed)
Creator of "Professional Validation And More" at
http://www.peterblum.com/vam/home.aspx