What is the best method for returning the AJAX outcome to the JSP page?

Question

What is the best method for returning the AJAX outcome to the JSP page?

Using AJAX, I am able to post data from my JSP page to my servlet.

$.ajax({                    
    url: 'myServlet?action=FEP',
    type: 'post',
    data: {machine: i, name: txt}, // where i and txt hold certain values
    success: function (data) {
        alert('success');
    }
});

In my Servlet code:

String jspAction = request.getParameter("action");

//...

if(jspAction.equals("FEP")){
    int idMachine = Integer.parseInt(request.getParameter("machine")); 
    String name = request.getParameter("name");
    double value = actions.getValue(idMachine, name); //<-- the value I want to send back to the JSP.
}

The data is sent successfully. However, I am currently unsure of how to return the value back to the JSP page.

javascript ajax jsp servlets

Answer 1

Answer №1

To send a string in response, the code snippet would be as shown below:

response.getWriter().write("Sample String Response");
return null;

If you prefer returning JSON data, there are various libraries available such as: http://www.json.org/

You can achieve this by implementing the following code:

response.setContentType("application/json");
JSONObject jsonObject = new JSONObject();
int anInt = 42;
jsonObject.put("result", anInt);
response.getWriter().write(jsonObject.toString());
return null;

Answer 2

To send a string in response, the code snippet would be as shown below:

response.getWriter().write("Sample String Response");
return null;

If you prefer returning JSON data, there are various libraries available such as: http://www.json.org/

You can achieve this by implementing the following code:

response.setContentType("application/json");
JSONObject jsonObject = new JSONObject();
int anInt = 42;
jsonObject.put("result", anInt);
response.getWriter().write(jsonObject.toString());
return null;

Answer 3

Answer №2

To utilize the code snippet below to output a value:

response.getWriter().write(value);
 return null;

In your ajax success function, you can access the returned value. For more in-depth explanation, check out the link provided

Answer 4

To utilize the code snippet below to output a value:

response.getWriter().write(value);
 return null;

In your ajax success function, you can access the returned value. For more in-depth explanation, check out the link provided

What is the best method for returning the AJAX outcome to the JSP page?

Answer №1

Answer №2

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