ASP NET Custom Validator Client side Server Side validation not firing

Question

This has not happened to me before  but for some reason both the client and server side validation events are not being triggered    lt asp TextBox ID  TextBoxDTownCity  runat  server  CssClass  contactfield    gt   lt asp CustomValidator ID  CustomValidator2  runat  server  EnableClientScript  true      ErrorMessage  Delivery Town or City required      ClientValidationFunction  TextBoxDTownCityClient       ControlToValidate  TextBoxDTownCity      OnServerValidate  TextBoxDTownCity Validate  Display  Dynamic   gt   lt  asp CustomValidator gt    Server-side validation event   protected void TextBoxDTownCity Validate object source  ServerValidateEventArgs args        args IsValid   false      Client-side validation event   function TextBoxDCountyClient sender  args        args IsValid   false      alert  test        I thought at the least the Server Side validation would fire but no   this has never happened to me before   This has really got me stumped   I looked at the output and ASP NET is recognizing the client side function   ASP NET JavaScript output   var ctl00 ctl00 content content CustomValidator2   document all   document all  ctl00 ctl00 content content CustomValidator2     document getElementById  ctl00 ctl00 content content CustomValidator2     ctl00 ctl00 content content CustomValidator2 controltovalidate    ctl00 ctl00 content content TextBoxDTownCity    ctl00 ctl00 content content CustomValidator2 errormessage    Delivery Town or City required    ctl00 ctl00 content content CustomValidator2 display    Dynamic    ctl00 ctl00 content content CustomValidator2 evaluationfunction    CustomValidatorEvaluateIsValid    ctl00 ctl00 content content CustomValidator2 clientvalidationfunction    TextBoxDTownCityClient     Rendered custom validator    lt span id  ctl00 ctl00 content content CustomValidator2  style  color Red display none   gt Delivery Town or City required lt  span gt     Can any one shed some light as to why both client and server side validation would not be firing   Edit  Typo I pasted in the wrong function  problem still the same  Just another update to the last comment  where by the TextBox cannot be empty   I tested this out and it is not true   On a blank page the CustomValidator fired my client side validation function fine without a value    lt asp TextBox ID  TextBox1  runat  server    gt   lt asp CustomValidator ID  CustomValidator1  runat  server   ErrorMessage  CustomValidator  ClientValidationFunction  TextBoxDAddress1Client  gt  lt  asp CustomValidator gt   lt asp Button ID  Button1  runat  server  Text  Button  onclick  Button1 Click    gt

User · Answer

Thanks for that info on the ControlToValidate LukeH!

What I was trying to do in my code was to only ensure that some text field A has some text in the field when text field B has a particular value. Otherwise, A can be blank or whatever else. Getting rid of the ControlToValidate="A" in my mark up fixed the issue for me.

Cheers!

User · Answer

Your CustomValidator will only fire when the TextBox isn t empty   If you need to ensure that it s not empty then you ll need a RequiredFieldValidator too      Note  If the input control is empty    no validation functions are called and   validation succeeds  Use a   RequiredFieldValidator control to   require the user to enter data in the   input control    EDIT   If your CustomValidator specifies the ControlToValidate attribute  and your original example does  then your validation functions will only be called when the control isn t empty   If you don t specify ControlToValidate then your validation functions will be called every time   This opens up a second possible solution to the problem  Rather than using a separate RequiredFieldValidator  you could omit the ControlToValidate attribute from the CustomValidator and setup your validation functions to do something like this   Client Side code  Javascript    function TextBoxDCountyClient sender  args        var v   document getElementById   lt   TextBoxDTownCity ClientID  gt    value      if  v                  args IsValid   false      field is empty           else              do your other validation tests here              Server side code  C     protected void TextBoxDTownCity Validate      object source  ServerValidateEventArgs args        string v   TextBoxDTownCity Text      if  v    string Empty                args IsValid   false      field is empty           else                  do your other validation tests here

User · Answer

Client-side validation was not being executed at all on my web form and I had no idea why   It turns out the problem was the name of the javascript function was the same as the server control ID     So you can t do this      lt script gt    function vld sender  args    args IsValid   true     lt  script gt   lt asp CustomValidator runat  server  id  vld  ClientValidationFunction  vld    gt    But this works    lt script gt    function validate vld sender  args    args IsValid   true     lt  script gt   lt asp CustomValidator runat  server  id  vld  ClientValidationFunction  validate vld    gt    I m guessing it conflicts with internal  NET Javascript

User · Answer

Server-side validation won t fire if client-side validation is invalid  the postback is not send   Don t you have some other validation that doesn t pass   The client-side validation is not executed because you specified ClientValidationFunction  TextBoxDTownCityClient  and this will look for a function named TextBoxDTownCityClient as validation function  but the function name should be TextBoxDAddress1Client   as you wrote

User · Answer

Use this    lt asp CustomValidator runat  server  id  vld  ValidateEmptyText  true   gt    To validate an empty field   You don t need to add 2 validators

User · Answer

Also check that you are not using validation groups as that validation wouldnt fire if the validationgroup property was set and not explicitly called via   Page Validate  Insert validation group name here

User · Answer

Did you verify that the control causing the post back has CausesValidation set to tru and that it does not have a validation group assigned to it   I m not sure what else might cause this behavior

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