json - create json object id based upon variable

Question

Is there a way to create a JSON object ID with a variable?

var json_result = [];
var id = 20;
json_result.push({id: {parentId: parentId, position: position}});

This results into a json object with the value 'id' as the id. I want to achieve to have the value '20' as the key.

EDIT: Include solution:

var json_result = {};
var id = 20;
json_result[id] = {parentId: parentId, position: position};

Now you can access parentId and position like this:

json_result[20].position
json_result[20].parentId

That's a JavaScript object, not a JSON object.

gen_Eric
– gen_Eric

2012-07-30 14:56:37 +00:00
Commented Jul 30, 2012 at 14:56 — gen_Eric
– gen_Eric, Commented Jul 30, 2012 at 14:56

Jon · Accepted Answer · 2012-07-30 14:55:36Z

4

You cannot write such an object literal (it's not a "JSON object" by the way; just a plain Javascript object), but you can do it like this:

var o = {};
o[id] = {parentId: parentId, position: position};
json_result.push(o);

answered Jul 30, 2012 at 14:55

Jon

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3 Comments

Thomas Kremmel Over a year ago

Thanks. This works. But I thought I should be able to access the value then like this: console.log(json_result[20]); But it does not work. Any idea what I have to change? Basically I want to access the parentid and position of the id 20 without looping over the entire array.

Jon Over a year ago

@TomTom: When you are pushing o into json_result you are not giving it a key equal to id. If you want to do that, simply use o as your json_result and remove all references to the original json_result (which is an array; you don't want that, based on the comment).

Thomas Kremmel Over a year ago

Thanks, now I got it. Included the solution in my question.

Tom · Accepted Answer · 2012-07-30 14:56:46Z

1

var json_result = [];
var id = 20;
var obj = {};
obj[id] = "something";
json_result.push(obj);

answered Jul 30, 2012 at 14:56

Tom

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Comments

jonathan.cone · Accepted Answer · 2012-07-30 14:56:56Z

0

This is one of the reasons the JSON spec says that keys should be strings. Your JSON should really look like this:

{
  "20": {
    "parentId": ..., 
    "position": ...}
}

... or similar. Check out http://json.org/example.html

answered Jul 30, 2012 at 14:56

jonathan.cone

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1 Comment

gen_Eric Over a year ago

He's trying to figure out how to get the 20 to be the key. Also, the OP really meant JavaScript object, not JSON object.

codebox · Accepted Answer · 2012-07-30 14:57:25Z

0

Yes, you can do it like this:

var obj = {};
obj[id] = {parentId: parentId, position: position};
json_result.push(obj);

answered Jul 30, 2012 at 14:57

codebox

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