json jquery issue

Question

i am using this to get informations from ajax jquery in json formate but it give me error like this 0 =[object object]

$.getJSON("ajax_files/getSingleRow.php?id="+id+"&type="+type, function(json){ 
 $.each(json, function(key, val) {
 //$("#"+key).val(val);
 alert(key+'='+val);
 });
 });

here is my josn string

[{"id":"1","ref":"RH-R-1","name":"","description_demo":"this is desc test"}]

---

Thanks all...here is how my json develops

 while($rw = $oAppl->row($res))
{
 $return[]=array('id'=>$rw['id'],
 'ref'=>$rw['ref'],
 'name'=>$rw['name'],
 'description_demo'=>$rw['description_demo']);
}
 header('Content-type: application/json');
 echo json_encode($return);

• Explosion Pills: Why do you think that is an error?
• Luca Rainone: Your json is an Array with one element that is an object.
• asifsid88: Do alert(json) to see the data you received??
• Anthony Grist: @asifsid88 The alert() function is awful for debugging and displaying information, as they've just discovered, because it doesn't show the properties of objects.

Answer 1

The JSON text consists of an array containing an object.

When you loop over it, you get the first key of the array (0) and then the string serialisation of the object ([Object object]). Then it stops because there is only one entry in the array.

This is not an error. It is expected behaviour given the data you are inputting.

Possibly you want to loop over the object instead, in which case:

var ob = json[0];
$.each(ob, function(key, val) {

Answer 2

That isn't an error, strictly, it's an object. It might contain an error, who knows. But the thing itself is a thing waiting to be accessed (i.e., the value of val) and there's nothing inherently erroneous with it.

Try accessing the members, output the id, name, etc, instead of just dumping the thing in an alert.

Answer 3

Try this:

$.getJSON("ajax_files/getSingleRow.php?id=" + id + "&type=" + type, function (json) {
 $.each(json, function (key, val) {
 // This will only give you the 'ref' value
 alert(key + '=' + val.ref);
 // To loop through all the values
 $.each(val, function (key2, data) {
 alert(key2 + ": " + data);
 });
 });
});

DEMO HERE

Answer 4

Your JSON string is wrapped inside an array. [ {} ] Leave the "[" and "]" out.

Answer 5

Read the propery value of your JSON collection item.

 $.each(json, function(key, item) {
 alert(key+'='+item.id);
 alert(key+'='+item.ref);
 alert(key+'='+item.description_demo);
 });

This should work fine assuming you have no other script errors in your page.

Working sample : http://jsfiddle.net/a4Efx/4/