Handle JSON server response in javascript

Question

I've seen many similar issues, but they didn't provide answer for my question. My Server form JSON string and put it into response:

List<String> list = getSomeList();
JSONArray jsArray = new JSONArray(list);
System.out.println(jsArray);
response.setContentType("application/json");
response.getWriter().write(jsArray.toString());

But in my javascript handle function when I alert response, it alert ALL page!

function handleResponse(){    
 if(http.readyState == 4 && http.status == 200){  
  var response = http.responseText;
   if(response){ 
     alert(response); //alert all page!
     var list = JSON.parse(response.toJSON()); //doesn't work! 
 }       
}

Question: how could I separate only jsArray in javascript?

P.S. As I understand, my JSON.parse(response.toJSON()) doesn't work because response contain the whole page?

in debug: jsArray - JSONArray jsArray.toString - "["Harkiv","Kiev","Lviv"]" — VB_
– VB_, Commented Apr 4, 2013 at 19:29
I don't know java, but try closing your response writer right after writing your jsArray. It's probably something like response.getWriter().close(); Client-side, JSON.parse() should be sufficient. No need to do response.toJSON() — Bart
– Bart, Commented Apr 4, 2013 at 19:32
response.getWriter().close() - Yes, it is what I want. Thank you ) — VB_
– VB_, Commented Apr 4, 2013 at 19:36

Bart · Accepted Answer · 2013-04-04 19:40:15Z

1

Disclaimer: I don't know java.

Server-side, the problem is probably that your response is not closed after writing your JSON Array, allowing other (html) text to be written. Try this:

response.setContentType("application/json");
response.getWriter().write(jsArray.toString());
response.getWriter().close();

Client-side, responseText is a string, and strings don't have a toJSON() function defined.

var list = JSON.parse(http.responseText);

should suffice.

answered Apr 4, 2013 at 19:40

Bart

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