Jsp rorm submitted twice problem

Question

Hi all,
I have developed a application using jsp. And I am facing problem in submitting the form. When i click the submit button(only once) i am calling a java script to submit to next jsp. But the request sent twice to the servlet engine for a single click. How to avoid this.
Please help me to eliminate this twice form submit.
I am attaching my code to understand where the problem--
<PRE>
<FORM NAME="ECRDurationUserData" onSubmit="processSubmit()">
<INPUT type=SUBMIT value="Generate Report" name="generateReport" Title="Select Parameters for Generating Report, then Click..>">
<script LANGUAGE="JavaScript">
<!--
function processSubmit()
     document.ECRDurationUserData.action="<%=codebase%>/ext/reports/outputforms/ecrdurresult.jsp";
          document.ECRDurationUserData.method="POST";
          document.ECRDurationUserData.submit();
-->
</SCRIPT>
</PRE>

Answer 1

When you click the submit button (type="submit"), it submits the form. Then your processSubmit function is also submitting the form. It's not a good idea to submit the form via a script, at least in this case. The processSubmit function should return a boolean to tell the form to submit...
<FORM NAME="ECRDurationUserData" onSubmit="return processSubmit();">
<INPUT type=SUBMIT value="Generate Report" name="generateReport" Title="Select Parameters for Generating Report, then Click..>">
<script LANGUAGE="JavaScript">
<!--
function processSubmit() {
   document.ECRDurationUserData.action="<%=codebase%>/ext/reports/outputforms/ecrdurresult.jsp";
   document.ECRDurationUserData.method="POST";
   return true;
-->
</SCRIPT>And unless you are doing something special in processSubmit to set the action and method for the form dynamically based on other form selections, you should be just doing this:
<FORM NAME="ECRDurationUserData" method="POST" action="<%=codebase%>/ext/reports/outputforms/ecrdurresult.jsp" >
<INPUT type=SUBMIT value="Generate Report" name="generateReport" Title="Select Parameters for Generating Report, then Click..>">But I assume you are actually going to change the form action based on other form field selections.