sending array as json to php script : returns empty array

Question

i'm trying to send a form inputs as array to a php script

function submit_form(){
    var arr  =  [];
    var key, val ;
    $('#form input').each(function(){

        key = $(this).attr('id');
        val = $(this).val();
        arr[key] = val;

    })
    alert(arr['username']); // check to see if array is not empty

    var jsondata =  JSON.stringify(arr); 

    $.post(base_url+'profile/edit_profile/<?php echo $profile_username; ?>' , {data : jsondata }, function(){
    })
}

on the php script

$data =  json_decode($_post['data']);
var_dump($data);
exit;

and here is the result

array (size=0)
  empty

Have you tried turning {data: ...} into {"data": ...}?

Waleed Khan
– Waleed Khan

2012-07-21 19:10:37 +00:00
Commented Jul 21, 2012 at 19:10 — Waleed Khan
– Waleed Khan, Commented Jul 21, 2012 at 19:10

user1106925 · Accepted Answer · 2012-07-21 19:11:23Z

3

You're using an Array when you should be using an Object.

var obj = {};
var key, val ;
$('#form input').each(function(){

    key = $(this).attr('id');
    val = $(this).val();
    obj[key] = val;

});

JSON methods will ignore non-numeric properties of Arrays.

Although instead of using id attributes, use name, and then use .serialize().

var data = $('#form input').serialize();

answered Jul 21, 2012 at 19:11

user1106925

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2 Comments

max Over a year ago

thanx , i thought using serialize whould give me a string of "k&v" pears and it used for GET method ?

user1106925 Over a year ago

@max: If you want an object structure, you can use serializeArray(), which will give you an array of objects.

hakre · Accepted Answer · 2012-07-21 19:12:45Z

0

This needs basic debugging first. Before you decode the data, dump it so you do ensure that the data is correct:

$data =  $this->input->post('data');
var_dump($data);
$array = json_decode($data);
var_dump($array);
exit;

Lessons to learn:

Do one step after the other. The more stupid the better.
Before and after each step, verify the data.

answered Jul 21, 2012 at 19:12

hakre

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