Validation

[shriram iyer]

Hi,

i have a form to capture user data.If user enters "null" in all the fields and submits the page,how to validate it using jsp.

Cheers,

[Bear Bibeault]

A user cannot enter null. I assume you mean leave it blank?

In any case, are you asking about client-side validation? If so, you'd use JavaScript.

If server-side, use Java in the servlet (not JSP) to which you submit the form. You should always validate on the server even if you perform client-side validation.

[Jerome Gao]

If you want to verify in the client,
example:
<script> var validateIsNull=function(){ var isSubmitForm = false; if(conditions){ isSubmitForm = true; } return isSubmitForm; } </script> <input type="submit" onClick="return validateIsNull()">
Of course, the server is to verify, regardless of in the client is validated!