Sending array through post jquery [duplicate]

Question

I now this question has been asked before but I am trying to work this out since this morning and I can't get it right.

I have a global variable named items

I have a .ajax request that I need to send the contents of the items array

Items is like this

items = new Array();

for (var i = 0; i < 10; i++)
{
   //just populating the list
   var item = [];

   item['some_stuff'] = 'string';
   item['some_int'] = 373;

   items.push(item);

}

//here is the request

    if (items.length > 0)
    {   
        $.ajax({
                type : "POST",
                url  : "/grad1/adaugaComanda.php",
                data : { "stuff" : items},
                success : function (data){

                    alert(data);
                //  window.location = '/dashboard.php?categ=5&sel=1';

                }
                });
    }

//

The request is executed but data is not sent. I tried to use JSON.stringify on the array but it returns empty ([[]]).

Any ideas what I am doing wrong ?

You'll need to define the array as var item = {}.

Sani Huttunen
– Sani Huttunen

2014-05-16 12:50:14 +00:00
Commented May 16, 2014 at 12:50 — Sani Huttunen
– Sani Huttunen, Commented May 16, 2014 at 12:50

Quentin · Accepted Answer · 2014-05-16 12:50:05Z

3

   //just populating the list
   var item;

This declares a variable called item but does not give it a value to it so it is undefined

   item['some_stuff'] = 'string';

This attempts to assign a value to the some_stuff property of undefined. This isn't allowed, so JS will throw an exception and script execution will cease.

You aren't making a request at all, because your script isn't getting far enough to do that.

You need to assign an object to item:

var item = {}

You have edited your question so your code now reads:

var item = [];

You still need to use a plain object here ({} not []). Array objects should only have numeric indexes. jQuery will ignore named properties on an array when serializing it.

answered May 16, 2014 at 12:50

Quentin

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6 Comments

opc0de Over a year ago

Is there a way I can convert the array into a object ?

Quentin Over a year ago

@ring0 — possibly, but I'm not certain and all the potential approaches I can think of are horrible. You really should use an object in the first place. An array is simply the wrong data structure to use in the first place.

Manwal Over a year ago

i think var item = new Array(); will also work.

Quentin Over a year ago

@Manwal — No. It won't. Named properties on arrays will not be serialized.

opc0de Over a year ago

Thanks man it really gave me a headache. The internet is full of missleading information including stackoverflow.

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