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	Martin Payne
	Asp.Net User

composite control with RequiredFieldValidator

4/12/2005 11:25:23 AM

0/0

I am trying to create a composite control that contains a RequiredFieldValidator but I'm having a few problems. The CreateChildControls method looks something like this -

Controls.Add(New TextBox())

Dim rfv as New RequiredFieldValidator()

rfv.ControlToValidate = Me.Controls(0).UniqueId

Controls.Add(rfv)

When I run it I get an error -

Unable to find control id 'mff1$ct100' referenced by the 'ControlToValidate property of

mff1$ct100 is the value of the name property of the textbox if I render the page without the RequiredFieldValidator (at which time it renders without issue).

There must be some way of creating a composite control containing a RequiredFieldValidator, what's the secret?

Cheers

Martin

"A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools."

Douglas Adams

	bmains
	Asp.Net User

Re: composite control with RequiredFieldValidator

4/12/2005 11:40:40 AM

0/0

Try using the ID or the ClientID properties instead... There isn't any control ID for the control specifically, because the ID should be TextBox<n>.

Brian

"Trust in the Lord and do what is good; dwell in the land and live securely. Take delight in the Lord, and He will give you your heart's desires" (Psalm 37: 3-4).

	Martin Payne
	Asp.Net User

Re: composite control with RequiredFieldValidator

4/12/2005 12:35:01 PM

0/0

I found my problem, although I'm not sure why. My class was implementing the iNamingContainer template. When I removed that it worked with both UniqueId and ClientId (btw, neither ClientId or ID worked until I removed the iNamingContainer thing).

Thanks for your help. I will muck around with the ability to use multiple instances of my class on the same page tomorrow (I suspect that I will have problems now that the iNamingContainer is gone Sad [:(] ).

Cheers

Martin

"A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools."

Douglas Adams

	hlaford
	Asp.Net User

Re: composite control with RequiredFieldValidator

4/12/2005 2:54:20 PM

0/0

using a validator in a custom control requires the validator and the validated controls be in the same naming container, whether or not that naming container is the custom control. if you remove the INamingContainer interface, you will need to perform the same logic yourself that you get for free: providing unique IDs for child controls. i do just that and all my controls work well; however, i am currently having issues when my controls are embedded in several layers of user controls. i don't know if it's really caused by a lack of a naming container, but there may be some hidden risk to doing things my way.

	master4eva
	Asp.Net User

Re: composite control with RequiredFieldValidator

4/12/2005 8:20:19 PM

0/0

This should work:

<code>
Imports System
Imports System.Web.UI
Imports System.Web.UI.WebControls

Public Class AComposite
    Inherits System.Web.UI.Control
    Implements INamingContainer

    Protected ReadOnly txtSomeTextBox As New TextBox()
    Protected ReadOnly rfvSomeTextBox As New RequiredFieldValidator()

    Protected Overrides Sub CreateChildControls()
        Me.Controls.Add(Me.txtSomeTextBox)
        Me.Controls.Add(Me.rfvSomeTextBox)

        Me.rfvSomeTextBox.ControlToValidate = Me.txtSomeTextBox.ID
    End Sub
End Class
</code>

-- Justin Lovell

	Martin Payne
	Asp.Net User

Re: composite control with RequiredFieldValidator

4/13/2005 3:20:19 AM

0/0

master4eva,

Adding the validator to the controls collection before setting its ControlToValidate property was something I hadn't yet tried. Unfortunately, after trying it I find the same problems. Does it work for you?

Thanks

Martin

"A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools."

Douglas Adams

	master4eva
	Asp.Net User

Re: composite control with RequiredFieldValidator

4/13/2005 5:20:28 PM

0/0

Oops. Forgot one thing. Remember that EnsureChildControls() (which in turn calls the CreateChildControls() method) is only called during OnPreRender - after all the validation logic has fired in the page. The thing is, you have to put your validator on the page before the logic that fires... and there are two locations in the page life cycle to do that: OnInit and OnLoad. So either two will be alright:

Protected Overrides Sub OnInit(e As EventArgs)
   MyBase.OnInit(e)
   Me.EnsureChildControls()
End Sub

' or

Protected Overrides Sub OnLoad(e As EventArgs)
   MyBase.OnLoad(e)
   Me.EnsureChildControls()
End Sub

-- Justin Lovell

	Martin Payne
	Asp.Net User

Re: composite control with RequiredFieldValidator

4/15/2005 2:36:21 AM

0/0

Perfect ! I put it in the OnInit and it works.

Many thanks,

Martin

"A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools."

Douglas Adams

8 Items, 1 Pages 1 |< << Go >> >|

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