Creating a 2d associative array javascript (same as a php assoc array)

Question

I am trying to create an array in javascript which will allow me to access data like this:

var name = infArray[0]['name'];

however I cant seem to get anything to work in this way. When i passed out a assoc array from php to javascript using json_encode it structured the data in this way. The reason why i have done this is so i can pass back the data in the same format to php to execute an update sql request.

If you just serialize the array, pass it to the other PHP file and then unserialize it, you will have an easier time of it. The intermediate Javascript conversion doesn't seem necessary. — DevlshOne
– DevlshOne, Commented Aug 5, 2013 at 18:47
@DevlshOne: JSON is a serialization format also, just a different one. — gen_Eric
– gen_Eric, Commented Aug 5, 2013 at 18:48
I don't quite understand what you mean, I have 2 arrays containing information which i need to pass back into php with the id from the information array taken out of php? — user2572475
– user2572475, Commented Aug 5, 2013 at 18:48
@RocketHazmat. I know what JSON is. LOL. If he's just sending it to another PHP file to process it in the database, there's no reason to make a Javascript Object out of it. — DevlshOne
– DevlshOne, Commented Aug 5, 2013 at 18:49

gen_Eric · Accepted Answer · 2013-08-05 18:47:44Z

4

JavaScript doesn't have associative arrays. It has (numeric) arrays and objects.

What you want is a mix of both. Something like this:

var infArray = [{
    name: 'Test',
    hash: 'abc'
}, {
    name: 'something',
    hash: 'xyz'
}];

Then you can access it like you show:

var name = infArray[0]['name']; // 'test'

or using dot notation:

var name = infArray[0].name; // 'test'

answered Aug 5, 2013 at 18:47

gen_Eric

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2 Comments

user2572475 Over a year ago

Thank you so much for all your answers, have been stuck stupidly on this for too long (guess sleep is needed) How would you do this so its empty and then you can populate it in a for loop ?

gen_Eric Over a year ago

Glad I could help! :-D

Matěj Pokorný · Accepted Answer · 2013-08-05 18:49:28Z

2

simply var infArray = [{name: 'John'}, {name: 'Greg'}] ;-)

answered Aug 5, 2013 at 18:49

Matěj Pokorný

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Comments

kwarunek · Accepted Answer · 2013-08-05 18:48:38Z

0

JavaScript doesn't have assoc arrays. Anything to any object declared as obj['somthing'] is equal to obj.something - and it is a property. Moreover in arrays it can be a bit misleading, so any added property won't changed array set try obj.length.

answered Aug 5, 2013 at 18:48

kwarunek

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Anuj · Accepted Answer · 2016-10-22 03:44:10Z

0

JavaScript do not have 2D associative array as such. But 2d associative array can be realized through below code:

var myArr = { K1: {
    K11: 'K11 val',
    K12: 'K12 Val'
    },
    K2: {
    K21: 'K21 Val',
    K22: 'K22 Val'
    }
};
alert(myArr['K1']['K11']);
alert(myArr['K1']['K12']);
alert(myArr['K2']['K21']);
alert(myArr['K2']['K22']);

answered Oct 22, 2016 at 3:44

Anuj

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