push to multidimensional array Javascript

Question

I have the following code:

    data_array =  {
                      full_name: 'fullname',
                      items: [],
                      address_full: 'address'
                  };

        first = {
            'data-opPrice'  : '1a',
            'data-stdPrice' : '1b',
            'state'         : '1c'
        };
        second = {
            'data-opPrice'  : '2a',
            'data-stdPrice' : '2b',
            'state'         : '2c'
        };          
        data_array.items.push(first);
        data_array.items.push(second);

    alert(data_array['items'][1].data-opPrice);

I would expect to get the alert "2a". But nothing happens. Why?

What does the console say?

James Montagne
– James Montagne

2013-01-04 19:36:34 +00:00
Commented Jan 4, 2013 at 19:36 — James Montagne
– James Montagne, Commented Jan 4, 2013 at 19:36
fiddle jsfiddle.net/nuclearghost/t9c7L

Mark Meyer
– Mark Meyer

2013-01-04 19:37:15 +00:00
Commented Jan 4, 2013 at 19:37 — Mark Meyer
– Mark Meyer, Commented Jan 4, 2013 at 19:37

James Montagne · Accepted Answer · 2013-01-04 19:38:20Z

4

It's because of the - in data-opPrice. - is subtraction.

alert(data_array['items'][1]['data-opPrice']);

http://jsfiddle.net/t9c7L/1/

answered Jan 4, 2013 at 19:38

James Montagne

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Comments

David G · Accepted Answer · 2013-01-04 19:37:13Z

1

You probably want:

data_array.items[1]['data-opPrice'];

answered Jan 4, 2013 at 19:37

David G

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Comments

asgoth · Accepted Answer · 2013-01-04 19:38:33Z

0

Try

alert(data_array['items'][1]['data-opPrice']);

because otherwise it's an operation ( data minus opPrice)

answered Jan 4, 2013 at 19:38

asgoth

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Comments

Emrah Mehmedov · Accepted Answer · 2013-01-04 19:41:48Z

0

use this:

data_array.items[1]['data-opPrice']

answered Jan 4, 2013 at 19:41

Emrah Mehmedov

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Alessandro G. · Accepted Answer · 2013-01-04 19:48:23Z

0

use the naming conventions and don't use dash (minus) on properties name.

So follow these rules: http://javascript.crockford.com/code.html

and then write a code like this:

data_array =  {
                  full_name: 'fullname',
                  items: [],
                  address_full: 'address'
              };

    first = {
        'dataOpPrice'  : '1a',
        'dataStdPrice' : '1b',
        'state'         : '1c'
    };
    second = {
        'dataOpPrice'  : '2a',
        'dataStdPrice' : '2b',
        'state'         : '2c'
    };          
    data_array.items.push(first);
    data_array.items.push(second);

alert(data_array.items[1].dataOpPrice);

answered Jan 4, 2013 at 19:48

Alessandro G.

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