Problem parsing JSON responce from server

Question

I'm making a post request to the server and getting back the array of data that I want, but I can't see to access the individual elements and I can't figure out why.

This is the jist of it

$(document).ready(function() {
  $.post("myscript", { Action: "JQueryReq",  },
  function(data){
   alert(data);
  });
});

If I do the above I get back everything I want and it looks like this (in the JS dialog box)

[{"val1":null,"val2":null,"val3":null,"Size":"Inches","valu4":null}]

But if I change

alert(data);

to

alert(data.Size);

I just get "undefined"

I also tried

var myjsonreturn = eval(data);
alert(myjsonreturn.Size);

I also tried

var myjsonreturn = eval('('+data+')');
alert(myjsonreturn.Size);

And every time I get undefined.

What am I doing wrong?

TIA

Please correct your question title to be something a little more informative than "Another" JSON Parsing question. It has something to do with accessing specific elements in JQuery. Please make your title helpful to everyone else with JSON parsing problems. — S.Lott
– S.Lott, Commented Nov 10, 2009 at 19:29

John Millikin · Accepted Answer · 2009-11-10 19:21:03Z

1

What is data? Is it a string? If so, you want to use:

eval('('+data+')')[0].Size;

answered Nov 10, 2009 at 19:21

John Millikin

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Andy Hume · Accepted Answer · 2009-11-10 19:32:48Z

0

Tried this?

alert(data[0].Size)

answered Nov 10, 2009 at 19:32

Andy Hume

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Comments

antti_s · Accepted Answer · 2009-11-13 22:50:16Z

0

What you're getting back as a JSON response is an array with just one cell. Because the array's length is 1 the index will start from the number 0, so you can access the contents like this:

alert(data[0].Size);

Or, if you want to loop through the values with jQuery's .each():

$.each(data[0], function(index, value){
    alert(index + ':' + value);
});

answered Nov 13, 2009 at 22:50

antti_s

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