Question

This question is related to the previous one, when I click over an anchor

<a href="#" id="Email">send email</a>

it calls servlet using json

   $("#Email").click(function() {

    var option={
        "action":"sendEmail"
    };
    $.getJSON('StudentManagementServlet',option, function(hasEmail) {
        if(hasEmail == false){
            // //view form to let user enter his email
            $("#CommViaEmail").fadeIn("normal");   
        }
    });
});

in servlet I handle the request

 if (action != null && action.equals("sendEmail")) {

    //open connection to db
    con.setAutoCommit(false);
    String email = ParentManagement.getParentEmail(con, stdNo);
    if (email != null) {
        String commResult = createAccountAndSendEmail(con, parentNo, email);
        request.setAttribute("result", commResult);
        request.setAttribute("incp", "ResultPage");
         RequestDispatcher dispatcher = request.getRequestDispatcher("/index.jsp");
        dispatcher.forward(request, response);  //doesn't make forward!!!!!
        System.out.println(">>send email DONE!!");
        con.commit();
        return;
    } else {
        boolean hasEmail = false;
        String json = new Gson().toJson(hasEmail);
        response.setContentType("application/json");
        response.setCharacterEncoding("UTF-8");
        response.getWriter().write(json);

    }
}

The problem here is if user has an email, then I send an email but request dosn’t forward to result page, even the print statement is printed ” System.out.println(“>>send email DONE!!”);” ??

Answer 1

You need to let JS/jQuery do that job. Let the servlet write true as JSON result and in JS do

if (hasEmail) {
    window.location = 'index.jsp';
} else {
    $("#CommViaEmail").fadeIn("normal");   //view form to let user enter his email
}

Or when you want to control the URL yourself, add the new location to the JSON

Map<String, Object> data = new HashMap<String, Object>();
data.put("hasEmail", true);
data.put("location", "index.jsp");
// ...

with

..., function(data) {
    if (data.hasEmail) {
        window.location = data.location;
    } else {
        $("#CommViaEmail").fadeIn("normal");   //view form to let user enter his email
    }
}