How can I get attribute of ajax response

Question

resp.getWriter().write("msg=1?id=" + l1); 

in the below code I can get responseText but how can I get the attribute of response text.

ajax code:

function updatecategories(cu) {
  var r1 = new XMLHttpRequest();
  r1.onreadystatechange = function() {
    if (r1.readyState == 4 && r1.status == 200) {
      if (r1.responseText = "1") {
        // how to get id from the response.
      }
    }
  };
  r1.open("GET", "../category_update?action=catu&cu=" + cu, true);
  r1.send();
}

Answer 1

You can set small information into the response header as name-value pairs. That way it's easier to retrieve.

Set the response header

response.setHeader("msg", "1");
response.setHeader("id", l1); //value must be a String.

Retrieve the information

if (r1.readyState == 4 && r1.status == 200) {
    var msg = r1.getResponseHeader("msg");
    var id = r1.getResponseHeader("id");
}

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Side note: when setting information into the response header make sure you always use a unique name . Avoid using names like

• status
• date
• content-length
• content-type

since they are already reserved.