Jquery get array details

Question

I'm having trouble getting a response back from a Jquery ajax call...

(It's a script to authenticate a user, and needs to return their name and user ID. My understanding was that I could encode it as JSON and get the data in the format below.

It is returning an error of "undefined" for the alert().

The javascript

$.ajax({
 type: "POST",
 url: "myURL.php",
 data: {username: username, password: password},
 success: function(results) {
  //THIS IS WHERE THE PROBLEM IS
  alert('Hi '+results.name); //Should be "Hi Basil Fawlty"
  }
});

The PHP (myURL.php)

//This comes from a SQL call that returns the following name
json_encode(array(
 'id'=>1,
 'name'=>'Basil Fawlty'
));

Any help or ideas on where I am going wrong would be greatly appreciated!

Thanks.

Solution: The solution was adding a dataType.

Answer 1

You're missing dataType: "json":

$.ajax({
 type: "POST",
 url: "myURL.php",
 dataType: "json",
 data: {username: username, password: password},
 success: function(results) {
  //THIS IS WHERE THE PROBLEM IS
  alert('Hi '+results.name); //Should be "Hi Basil Fawlty"
  }
});

Another (less verbose) alternative is jQuery.getJSON if you know you are getting JSON.

Answer 2

Make sure to set your dataType to JSON so you get the response object in the success method, like this:

$.ajax({
 type: "POST",
 url: "myURL.php",
 dataType: "json",
 data: {username: username, password: password},
 success: function(results) {
  alert('Hi '+results.name);
 }
});

Details for dataType can be found here.

Alternatively, you can do this:

$.getJSON( "myURL.php", {username: username, password: password}, 
  function(results) {
    alert('Hi '+results.name);
});

Answer 3

my guess is that you are expecting JSON but you are getting a string.

Answer 4

You either need to specify a dataType in the request like so:

$.ajax({
 type: "POST",
 url: "myURL.php",
 data: {username: username, password: password},
 dataType: "json", 
 success: function(results) {
  //THIS IS WHERE THE PROBLEM IS
  alert('Hi '+results.name); //Should be "Hi Basil Fawlty"
  }
});

or you can set the content type from php using

header( "Content-Type: application/json" );

Answer 5

If you are using jQuery < 1.4, you must specify dataType: "json".

As of 1.4, dataType defaults to:

Intelligent Guess (xml, json, script, or html)

But this requires that the response header contains the string "json". So you'll want to send:

header('Content-type: application/json');

This newly added flexibility with dataType allows handlers to respond to multiple returned types.

If the problem continues, you'll want to alert the entire response alert(results); to see what's actually being returned.

Lot of similar answers here. Not sure who started it but whoever did no doubt invaded Poland.