Question

I’m going to implement a searching function for a sms managing system, where the user can enter a name(keyword) and get relevant information.

This is the code that i wrote in “InstantSMS.jsp”

---

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

        var keyword = $("#customerName").val();
        $.ajax({

            type : "GET",
            url : "SearchingClass",
            data : {
                key : keyword
            }

        }).success(function() {

            $.getJSON('SearchingClass', function(data) {

              $("#resultTable").html(data.messageRes);
            });


        })

        .error(function(request, error) {

            $().toastmessage('showWarningToast', "Error! ");
        });

    });

---

Here the ‘SearchingClass’ is the name of the servlet.
this is the code of ‘SearchingClass.java’

---

protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

    String keyword = request.getParameter("key");
    SmsMessagesService search = new SmsMessagesService();
    ArrayList<Customers> result = new ArrayList<Customers>();
    System.out.println("For testing Keyword is  ::: "+keyword);

    result = search.searchCustomer(keyword);
    String table = "in here i'll generate a code to draw a table using html"

    Map<String, Object> data = new HashMap<String, Object>();
        data.put("messageRes", table);


    // Write response data as JSON.
    response.setContentType("application/json");
    response.setCharacterEncoding("UTF-8");
    response.getWriter().write(new Gson().toJson(data));    
}

protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

    doGet(request,response);

}

---

Now the problem is after i press the search button the searching process or the doGet method run 2 times.

In 1st run output
“For testing Keyword is ::: john ”
2nd run
“For testing Keyword is ::: “

I think that the 2nd run is happening because of “$.getJSON()” method.
How to avoid this ?

How can i use $.getJSON() method only to get the “String table” but not to run the “doGet()” method ?

Is there another way to get a string from servlet to jsp using ajax ?

Can i pass this keyword using $.getJSON() method ?

Thank you !

Answer 1

You can use shorthand AJAX call.

var keyword = $("#customerName").val();

$.get("SearchingClass", {key:$keyword}, function(data) {

            $("#resultTable").html(data.messageRes);
        });