Getting the string version from ajax call

Question

I'm getting an object from an ajax call, but I need the string instead. What should I do instead?

//some code...    

$.ajax({
type: "POST",
url: action,
data: { pictureID: pictureID, comment: comment },
error: function(xhr,status,error){alert(error);},
complete:function(data) {
document.getElementById(outputID).innerHTML = data;           
} //end of complete:function(data)
}); //end of $.ajax({

<?php
echo "test";
?>

[object Object]

test

Answer 1

Change the method from Complete to Success

$.ajax({
   type: "POST",
   url: action,
   data: { pictureID: pictureID, comment: comment },
   error: function(xhr,status,error){alert(error);},
   success:function(data) {
        document.getElementById(outputID).innerHTML = data;           
   } 
}); 

The first argument to the complete function is a jqXHR, not the response