how to parse an associative array through json in javascript

Question

I have a 2-D php array which i am encoding through JSON. My 2d array in php is something like this:

$array['A'][12] = 8;
$array['A'][8] = 21;

$array['B'][17] = 19;
$array['B'][9] = 12;

when I do echo json_encode($array); and alert this as Ajax xmlhttp.responsetext i get this in my alert box : {"A":{"12":"8","8":"21"},"B":{"17":"19","9":"12"}}

which is absolutely fine. Now i need to parse it in javascript so i used the JSON.parse() function. The problem is when i access the A and B fields of the string. I get this in my alert boxes: Object object. How to parse this associative array? I am a beginner in AJAX and JSON so please help.

B is an object as well as A, you'll need to write response.A["12"] to get "8" — Carlo Moretti
– Carlo Moretti, Commented Sep 18, 2012 at 12:06

Armel Larcier · Accepted Answer · 2012-09-18 12:06:07Z

3

var array = JSON.parse(yourResponseData);

array.A // Object
array.A['12'] //8

You can't access the key '12' via the dot syntax becase no variable name can start with a number.

answered Sep 18, 2012 at 12:06

Armel Larcier

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5 Comments

Mohit Srivastava Over a year ago

but when i do this var parsedJSON = JSON.parse(xmlHttp.responseText); alert(parsedJSON.A[8]); i get 'undefined' in alert box :(

ke20 Over a year ago

Use quotes or it will be consider as the eighth element: alert(parsedJSON.A["8"]);

Mohit Srivastava Over a year ago

is there a way through which i can store all the keys of the object A and object B in 2 different variables ?

Armel Larcier Over a year ago

You mean like var a = array.A, b = array.B; ??? Or just the keys? Try for(key in array.A){console.log(array.A[key]);}

Mohit Srivastava Over a year ago

I mean i want to store all the keys of object A (namely 12 and 8) in a variable

zhujy_8833 · Accepted Answer · 2012-09-18 23:37:40Z

0

You can use console.log() rather than alert() to see the complete structure of that parsed json object. You can easily retrieve the value by using . notation or [] brackets: For example:

var returned = JSON.parse(tran.responseText);
console.log(returned['A']['8']); //which should give you '21' based on your case

answered Sep 18, 2012 at 23:37

zhujy_8833

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