How to set Invalid Style on server side

[Li Zhou]

Can someone help me how t set invalid style in server side.  My code as as following.  When validate through client side, textbox style is set to invalid style(CssClass="InvalidTextBox") if validation fails.  Similarlly I want to do the validation in server side just in case client side validation does not go through.  How to set to Invalid style in server side ?

<

 

telerik:RadTextbox ID="Email" runat="server">

 

    <

 

EmptyMessageStyle CssClass="EmptyTextBox" />

 

 

 

 

 

    <EnabledStyle CssClass="EnabledTextBox" />

 

 

 

 

 

    <FocusedStyle CssClass="FocusedTextBox" />

 

 

 

 

 

    <HoveredStyle CssClass="HoveredTextBox" />

 

 

 

 

 

    <InvalidStyle CssClass="InvalidTextBox" />

 

 

 

</telerik:RadTextbox>
<

 

asp:CustomValidator runat="server" EnableClientScript="true" controltovalidate="Email" id="ev" ClientValidationFunction="ClientValidate" OnServerValidate="ServerValidate" />

 

function

 

ClientValidate(sender, args)
{

 

 

     var email = $find("<%= email.ClientID %>");

 

 

        if (! validate(email.get_value())) 
       {

 

            email._invalid =

true;

 

            email.updateCssClass();

            args.IsValid =

false;

 

        }

}

 

protected void ServerValidate(object source, ServerValidateEventArgs args)

 

{

 

    args.IsValid = validate(email.Text);

 

 

    if (!args.IsValid)

 

    {

 

        //how to set invalid style for email RadTextBox ????

 

 

    }
}

 

[Dimo]

Hi Li Zhou,

Probably the easiest way to achieve the desired behavior is to use an additional asp:HiddenField control to pass a flag to the client, then use the RadTextBox' Load client event, check the flag value, set the _invalid client property and execute updateCssClass(), as in the ClientValidate function.

http://www.telerik.com/help/aspnet-ajax/input_clientsideonload.html

Afterwards, the _invalid property value can be changed in the ValueChanged RadTextBox client event handler.

http://www.telerik.com/help/aspnet-ajax/input_clientsideonvaluechanged.html

Greetings,
Dimo
the Telerik team

[Rafal]

Can this please be added to the back end at some point? it should have been there to begin with....
Thanks
Rafal

[Tsvetina]

Hello Rafal,

Adding such functionality could introduce a lot of conflicts with custom client-side validation of the controls or validation from other parts of the page . There are many possible scenarios all of which could hardly be handled in order to implement such feature. Currently a scenario requiring not that much custom code does not outweigh the effort and limitations of trying to make this a built-in feature.

Regards,
Tsvetina
the Telerik team