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Editorial Team
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Asked: 2026-06-09T10:13:59+00:00

I have this jsp page – <%@page import=java.text.Normalizer.Form%> <!DOCTYPE html PUBLIC -//W3C//DTD HTML 4.01

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I have this jsp page – 

<%@page import="java.text.Normalizer.Form"%>    
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    </head>
    <body>

        <legend>Create new customer</legend>
          <%!
        boolean checkForm(Form theForm)
        {
          // some checks on "theForm" .. 
          return false ; 
        }
        %>
        <form action="CreateCustomerServlet" method="GET" onsubmit=<%=checkForm() %>>
            // form's fields .. 
            <input type="submit" value="Create customer" />
        </form>
        </fieldset>
    </body>
    </html>

What I trying to do is when press on submit it will go to the checkForm function and check the form , and only if checkForm returned true it will go CreateCustomerServlet servlet .

But when I run on server this page and press on submit button I see that it’s ignore from thecheckForm and directly go to CreateCustomerServlet servlet .

I know that to this with javascript is very easy .. but I want to do it with java function .

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1 Answer

  1. Editorial Team

    When the JSP is evaluated, it produces a static HTML page that’s returned to the user. The server won’t be involved in the process again until it receives the form submission. If you do want some server-side behavior executed from the onsubmit handler, you’ll need to do it via AJAX.

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