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.NET Forum / ASP.NET / General / December 2007Validating CheckBoxes on the ClientSide
I've not been able to get a Check box to client side validated on postback. with my changes I can get it to work on the serverside ok but not on the client. I have created a new control as below:- [ValidationProperty("ValidationValue")] public class ValidifiableCheckBox: CheckBox { public string ValidationValue{ get { return (this.checked ? bool.TrueString : string.Empty); } } } this gives me a CheckBox that the Validators will except (rather than throwing an exception about not being able to validate them), If I use it with a RequiredFieldValidator, the Serverside events valdiation works however it doesn't seem to trap it on the client, my page code is bellow: - <myControls:ValidifiableCheckBox ID="cbAgree" runat="server"/> <asp:RequiredFiledValidator ID="rfvAgree" runat="server" ControlToValidate="cbAgree" ErrorMessage="Oh Dear" Text="*"/> <asp:ValidationSummary ID="vsAgree" runat="server" ShowMessageBox="true" ShowSummary="false"/> Any ideas? Why did microsoft not make the CheckBox control validatable? Well a checkbox is basically either checked or unchecked so having the special case were the user has to check the checkbox were likely not MS top priority (my understainding is that you want to display a checkbox that is necessarily checked). Also I would try a compareValidator rather than a requiredfield validator (you want the value to be true, "on" or whatever else is used for a checked box, if the box is unchecked it doesn't mean IMO that a value hasn't been provided but that the value provided by the user is just "false"). Finally if you have to create your own validator, see for example http://aspnet.4guysfromrolla.com/articles/073102-1.aspx. Server validation is fine but AFAIK you have to provide client side validation code if you want to validate this client side (server side code runs server side and can't be run or won't be transformed automatically for the client side handling). -- Patrice > I've not been able to get a Check box to client side validated on > postback. with my changes I can get it to work on the serverside ok but [quoted text clipped - 25 lines] > > Why did microsoft not make the CheckBox control validatable? Thanks for your response, Whilst waiting for a response I've already investigated the custom validator, however, when I try to get the "args.Value" in my clientside code I always get the value "on" regardless of state. Here is my code from my custom validator can you spot any errors? protected void Page_Load(object sender, EventArgs e){ string csValidFunc = "function ClientValidateVCB(source, args){" + Environment.NewLine + " args.IsValid = (args.Value == '" + bool.TrueString + "');" + Environment.NewLine + "}"; ClientScript.RegisterClientScriptBlock(this.GetType(), "ClientValidateVCB", csValidFunc, true); } protected void cvAgree_ServerValidate(object source, ServerValidateEventArgs args) { args.IsValid = (args.Value == bool.TrueString); } > Well a checkbox is basically either checked or unchecked so having the > special case were the user has to check the checkbox were likely not MS top [quoted text clipped - 45 lines] >> >>Why did microsoft not make the CheckBox control validatable? Hi MC, As for ASP.NET CheckBox control, it does be a particular one which can not be used directly by any built-in validators except the CustomValidator control. Also, even for custom validator, you still need to particularly customize the validation function(client script). Here is a forum article which provide an example on how to use custom valiator to validate checkbox: #Control 'CheckBox1' referenced by the ControlToValidate property http://www.syncfusion.com/FAQ/aspnet/WEB_c18c.aspx#q464q and another article provide good example on impleneting custom validator: #Implementing custom validation in ASP.NET with the CustomValidator class http://www.kuam.com/techtalk/customvalidatorclass.htm Sincerely, Steven Cheng Microsoft MSDN Online Support Lead This posting is provided "AS IS" with no warranties, and confers no rights. -------------------- >Date: Thu, 13 Dec 2007 13:08:24 +0000 >From: mc <mc@community.nospam> [quoted text clipped - 68 lines] >>> >>>Why did microsoft not make the CheckBox control validatable? Thanks for that, this was the solution I stumbled across myself. However I was hoping that I would be able to work with args.Value, and have clean generic functions is there not anything I could do with my inherited control to make it correctly validatable? Is there a bug or issue within asp.net which means the "Team" couldn't make the CheckBox validatable? Thanks MC > Hi MC, > [quoted text clipped - 133 lines] >>>> >>>>Why did microsoft not make the CheckBox control validatable? Thanks for your reply MC, So far this seems a limitation due to the existing CheckBox control's implementation. I suggest you post this issue to the product feedback center so that the product team can receive feedback on this: http://connect.microsoft.com/feedback/default.aspx?SiteID=210 Sincerely, Steven Cheng Microsoft MSDN Online Support Lead This posting is provided "AS IS" with no warranties, and confers no rights. -------------------- >Date: Fri, 14 Dec 2007 09:23:14 +0000 >From: mc <mc@community.nospam> [quoted text clipped - 34 lines] >> >> This posting is provided "AS IS" with no warranties, and confers no rights. IMO the problem is that the checkbox input control doesn"t have a value property. What is the bool variable you are referring to ? IMO you should use somewhere the checked property (and you'll have to get this value by yourself). -- Patrice > Thanks for your response, Whilst waiting for a response I've already > investigated the custom validator, however, when I try to get the [quoted text clipped - 69 lines] >>> >>>Why did microsoft not make the CheckBox control validatable? bool is not a variable. It is a reference to the static field "TrueString" of the bool type. See here for a full explanation. http://msdn2.microsoft.com/en-us/library/system.boolean.truestring(VS.71).aspx The theory of my first post is that the control below, should give you a check box with the correct value defined. so it can be used in the validators. It works server side but client side it fails. [ValidationProperty("ValidationValue")] public class ValidifiableCheckBox : CheckBox { public string ValidationValue{ get { return (this.checked ? bool.TrueString : string.Empty); } } } it could also be validly defined as: - [ValidationProperty("Wibble")] public class CheckBoxWithValue : CheckBox { public string Wibble{ get { return (this.checked ? bool.TrueString : string.Empty); } } } If in the ServerValidate you access args.Value you will get the output of Wibble, however this doesn't change the client side functionality which always just returns "on". regardless of checked state. > IMO the problem is that the checkbox input control doesn"t have a value > property. What is the bool variable you are referring to ? [quoted text clipped - 78 lines] >>>> >>>>Why did microsoft not make the CheckBox control validatable? Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. 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