CODEWITHSUNDEEP
asp.net
Trista
Trista

Reputation: 57

ASP.NET, how to show the error message of customValidator without postback?

Is there a way to show the error message of customValidator without POSTBACK?

I have used both requiredFieldValidator and customValidator. The fomer can be inline and can show error message without postback. Is this possible for customValidator?

Upvotes: 0

Views: 1214

Answers (2)

Bilal Fazlani
Bilal Fazlani

Reputation: 6967

Option 1 :

Whenever I create a custom validator, I try to create a server and client side validation methods to validate. creating a client side method will avoid unnecessary postback. As a safety measure, server side method should be present.

Example : 

<asp:Textbox id="text1" runat="server" text=""></asp:Textbox>
<asp:CustomValidator id="CustomValidator2" runat="server" 
  ControlToValidate = "text1"
  ErrorMessage = "You must enter at least 8 characters!"
  ClientValidationFunction="validateLength" >
</asp:CustomValidator>
<script type="text/javascript">
  function validateLength(oSrc, args){
   args.IsValid = (args.Value.length >= 8);
}
</script>

Option 2:

It is not always possible to build a client side validation method. There you can use update panel to hide those postbacks.

Upvotes: 1

Samiey Mehdi
Samiey Mehdi

Reputation: 9414

you can use Update Panel ajax to this action without postback.

Upvotes: 1

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