Why is parsing a jSON response to a jQUERY ajax request not working
- by Ankur
I know there are several similar questions on SO, I have used some of them to get this far. I am trying to list a set of urls that match my input values. I have a servlet which takes some input e.g. "aus" in the example below and returns some output using out.print() e.g. the two urls I have shown below.
EXAMPLE
Input: "aus"
Output: [{"url":"http://dbpedia.org/resource/Stifel_Nicolaus"},{"url":"http://sempedia.org/ontology/object/Australia"}]
Which is exactly what I want. I have seen that firebug doesn't seem to have anything in the response section despite having called out.print(jsonString); and it seems that out.print(jsonString); is working as expected which suggests that the variable 'jsonString' contains the expected values.
However I am not exactly sure what is wrong.
-------- The jQuery ---------
$(document).ready(function() {
$("#input").keyup(function() {
var input = $("#input").val();
//$("#output").html(input);
ajaxCall(input);
});
});
function ajaxCall(input) {
// alert(input);
$.ajax({
url: "InstantSearchServlet",
data: "property="+input,
beforeSend: function(x) {
if(x && x.overrideMimeType) {
x.overrideMimeType("application/j-son;charset=UTF-8");
}
},
dataType: "json",
success: function(data) {
for (var i = 0, len = datalength; i < len; ++i) {
var urlData = data[i];
$("#output").html(urlData.url);
}
}
});
}
------ The Servlet that calls the DAO class - and returns the results -------
public class InstantSearchServlet extends HttpServlet{
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
System.out.println("You called?");
response.setContentType("application/json");
PrintWriter out = response.getWriter();
InstantSearch is = new InstantSearch();
String input = (String)request.getParameter("property");
System.out.println(input);
try {
ArrayList<String> urllist;
urllist = is.getUrls(input);
String jsonString = convertToJSON(urllist);
out.print(jsonString);
System.out.println(jsonString);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private String convertToJSON(ArrayList<String> urllist) {
Iterator<String> itr = urllist.iterator();
JSONArray jArray = new JSONArray();
int i = 0;
while (itr.hasNext()) {
i++;
JSONObject json = new JSONObject();
String url = itr.next();
try {
json.put("url",url);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
jArray.put(json);
}
String results = jArray.toString();
return results;
}
}
