Validator message disappeared after post back -- asp.net building controls

asp.net building controls : Validator message disappeared after post back

HipHop
12/22/2006 3:25:36 PM

Hi,
I have a compositecontrol contain a textbox (txtPhoneNumber) and a
RegularExpressionValidator.
I tested in a page, the validation seems work fine until post back, the
validation message disappeared after post back while the text in the phone
number still remain the invalid format.

Could anybody please help me.
Thanks.

wawang NO[at]SPAM online.microsoft.com
12/25/2006 12:00:00 AM

Hi HipHop,

Which control caused the post back? Is its CausesValidation set to true?

Based on my test code:

namespace myns
{
public class Class1 : CompositeControl
{
private TextBox m_txtPhoneNumber;
private RegularExpressionValidator m_vldPhoneNumber;

protected override void CreateChildControls()
{
Controls.Clear();

m_txtPhoneNumber = new TextBox();
m_txtPhoneNumber.ID = "txtPhoneNumber";
Controls.Add(m_txtPhoneNumber);

m_vldPhoneNumber = new RegularExpressionValidator();
m_vldPhoneNumber.ID = "vldPhoneNumber";
m_vldPhoneNumber.ValidationExpression = @"\d+";
m_vldPhoneNumber.ControlToValidate = "txtPhoneNumber";
m_vldPhoneNumber.ErrorMessage = "Invalid phone number";
m_vldPhoneNumber.EnableClientScript = true;
Controls.Add(m_vldPhoneNumber);
}
}
}

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"
Inherits="_Default" %>
<%@ Register TagPrefix="c" Namespace="myns" Assembly="__code" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<c:Class1 ID="c1" runat="server" />
<asp:Button ID="Button1" runat="server" CausesValidation="False"
OnClick="Button1_Click"
Text="Button" /></div>
</form>
</body>
</html>

This reproduces the exact issue you described. However, this is expected
since the button's CausesValidation is turned off and the validation will
not occur.

If this is not your case, would you please post your code here? Thanks.

Merry Christmas and Happy New Year!

Sincerely,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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wawang NO[at]SPAM online.microsoft.com
12/28/2006 11:33:29 AM

Hi HipHop,

I am interested in this issue. Would you mind letting me know the result of
the suggestions? If you need further assistance, feel free to let me know.
I will be more than happy to be of assistance.

Have a great day!

Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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HipHop
1/4/2007 3:14:29 PM

Walter, Thank you for your answer. However, I don't have buttons, all I have
is another textbox which causevalidation set to false, but AutoPostBack set
to true in order to trigger TextChanged event.

Here is my code for Conposite Control EmailTextBox (Let's use Email instead
of PhoneNumber),
====================begin of EmailTextBox =====
using System;

using System.Collections.Generic;

using System.Text;

using System.ComponentModel;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Drawing;

namespace EnterpriseLibrary.WebControls

{

[DefaultProperty("Value")]

[ToolboxData("<{0}:ncEmailTextBox runat=server></{0}:ncEmailTextBox>")]

public class ncEmailTextBox : CompositeControl

{

private TextBox txtEmail = new TextBox();

private RegularExpressionValidator VldtrEmail;

[Bindable(true)]

[Category("Appearance")]

[DefaultValue("")]

[Localizable(true)]

public string Value

{

get

{

return txtEmail.Text;

}

set

{

EnsureChildControls();

txtEmail.Text = value;

}

}

protected override void CreateChildControls()

{

txtEmail.ID = this.ID + "_Email";

txtEmail.Width = 140;

VldtrEmail = new RegularExpressionValidator();

VldtrEmail.ID = this.ID + "_VldtrEmail";

VldtrEmail.ControlToValidate = txtEmail.ID;

VldtrEmail.ValidationExpression =
@"^([0-9a-zA-Z]+[-._+&])*[0-9a-zA-Z]+@([-0-9a-zA-Z]+[.])+[a-zA-Z]{2,6}$";

VldtrEmail.Text = "Invalid email format.";

VldtrEmail.Display = ValidatorDisplay.Static;

this.Controls.Add(txtEmail);

this.Controls.Add(VldtrEmail);

base.CreateChildControls();

}

public override void RenderControl(System.Web.UI.HtmlTextWriter writer)

{

writer.RenderBeginTag(HtmlTextWriterTag.Table);

writer.RenderBeginTag(HtmlTextWriterTag.Tr);

writer.RenderBeginTag(HtmlTextWriterTag.Td);

txtEmail.RenderControl(writer);

VldtrEmail.RenderControl(writer);

writer.RenderEndTag(); // td

writer.RenderEndTag(); // tr

writer.RenderBeginTag(HtmlTextWriterTag.Tr);

writer.RenderBeginTag(HtmlTextWriterTag.Td);

writer.RenderEndTag();//td

writer.RenderEndTag();//tr

writer.RenderEndTag(); // table

}

protected override void Render(HtmlTextWriter writer)

{

base.Render(writer);

}

}

}

============ end of EmailTextBox ==================

Code for the Page:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="play.aspx.cs"
Inherits="play" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >

<head runat="server">

<title>Untitled Page</title>

</head>

<body>

<form id="form1" runat="server">

<table>

<tr><td>Composite Control Email:</td><td><nc:ncEmailTextBox ID="Email"
runat="server" /></td></tr>

<tr><td>Some TextBox with AutoPostBack:</td><td><asp:TextBox ID="TextBox1"
runat="server" AutoPostBack="true"
OnTextChanged="TextBox1_TextChanged"></asp:TextBox></td></tr>

</table>

</form>

</body>

</html>

[quoted text, click to view]

wawang NO[at]SPAM online.microsoft.com
1/5/2007 2:55:04 AM

Hi HipHop,

To make the validator work in or before a postback, the control who will
cause the postback must have CausesValidation set to true. Would you please
set the TextBox's CausesValidation to true and test it again:

<asp:TextBox ID="TextBox1" runat="server" CausesValidation="true"
AutoPostBack="true" OnTextChanged="TextBox1_TextChanged"></asp:TextBox></td>

I've tested it on my side using your code, if the CausesValidation is set
to true, the page will not be posted back since client-side validation is
enabled and the validation result is false, therefore it prevents the page
being posted back.

Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
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HipHop
1/8/2007 11:07:46 AM

Thanks, it works. But what if I have a calendar that required a post back to
trigger the server event, the error message will disappear after a post
back.
Of course it will come back if user did not correct them and push the summit
button which I check if the page is valid.
Is this the only way?

[quoted text, click to view]

wawang NO[at]SPAM online.microsoft.com
1/9/2007 8:52:08 AM

Hi HipHop,

I've done some research (using Reflector to dig into the implementation of
Calendar and Button controls), unfortunately it's not possible to extend
the Calendar to support CausesValidation function as in Button.

In the Button, it uses customized PostBackOptions to indicate that the
generated javascript to postback the page will validate the page first. The
Calendar control's relevant functions are private and not possible to
override.

Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

==================================================
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
==================================================

This posting is provided "AS IS" with no warranties, and confers no rights.

wawang NO[at]SPAM online.microsoft.com
1/11/2007 11:12:10 AM

Hi Hiphop,

Not sure if you've seen my previous reply. Please feel free to let me know
if you want more information on it. Thanks.

Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

==================================================
When responding to posts, please "Reply to Group" via your newsreader so
that others may learn and benefit from your issue.
==================================================

This posting is provided "AS IS" with no warranties, and confers no rights.

HipHop
1/17/2007 9:52:28 AM

Hi, Walter,
Thank you for your help. I guess I will leave it for now.

[quoted text, click to view]

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