button click in html for jsp - html

Question

I have the following coding in JSP which work when a JSP page is loaded:
<%
String sportugues = request.getParameter("port");
String senglish = request.getParameter("engl");
String sfuncgram = request.getParameter("funcgram");
//Integer snsyn = Integer.valueOf(request.getParameter("nsyninp"));
Usuario usu = new Usuario();
usu.setPortugues(sportugues);
usu.setEnglish(senglish);
usu.setFuncgram(sfuncgram);
//usu.setNsyn(snsyn);
UsuarioDao usudDao = new UsuarioDao();
usudDao.cadastroStudyAlfaDireita(usu);
%>
But I want it to work only when I click a HTML button like:
<button onclick="">JSP Command</button>
The button and the JSP coding must be in the same JSP page.

Answer 1

You can wrap your code that you need to load when click in a condition that check isButtonClick, then assign to onClick a function to update it
<c:set var="isButtonClicked" value="false" />
<c:if test="${isButtonClicked}">
<%
String sportugues = request.getParameter("port");
String senglish = request.getParameter("engl");
String sfuncgram = request.getParameter("funcgram");
//Integer snsyn = Integer.valueOf(request.getParameter("nsyninp"));
Usuario usu = new Usuario();
usu.setPortugues(sportugues);
usu.setEnglish(senglish);
usu.setFuncgram(sfuncgram);
//usu.setNsyn(snsyn);
UsuarioDao usudDao = new UsuarioDao();
usudDao.cadastroStudyAlfaDireita(usu);
%>
</c:if>
<button onClick="function(){<c:set var="isButtonClicked" value="${!isButtonClicked}"} />