Access Cascaded JSON in javascript

Question

If I have the following JSON object, how can I access the survey.id (e.g 1) using JavaScript? I'm using Backbone / json.stringify / object.parse

[{
    "class": "org.example.UserBooking",
    "id": 1,
    "booking": {
        "class": "Booking",
        "id": 1
    },
    "profile": {
        "class": "Profile",
        "id": 3
    },
    "survey": {
        "class": "Survey",
        "id": 1
    },
    "tslot": {
        "class": "TimeSlot",
        "id": 5
    }
}]

??

I can't figure out how to access this "survey" id as its cascaded in. If I wanted to access the "id" for example i do:

var obj = $.parseJSON(JSON.stringify(userbooking));

alert(obj.id);

thanks

thanks for your response. When i try the following line:

var obj = JSON.parse(JSON.stringify(userbooking)); alert(obj.Survey.id);

i get the following error:

Uncaught TypeError: Cannot read property 'id' of undefined –

obj.survey.id should work based on this structure, no? – Ohgodwhy Oct 01 '12 at 21:08 — Ohgodwhy, Oct 01 '12 at 21:08
obj[0].survey.id should solve your problem – Anoop Oct 01 '12 at 21:09 — Anoop, Oct 01 '12 at 21:09

Sushanth -- · Accepted Answer · 2012-10-01T21:16:18.507

3

Try accessing the id inside survey like this

 obj[0].survery.id

The json data in the current context is enclosed like this

[ { } ]..

So it's a array of objects , because it's the First object we are trying to access..

It should be obj[0]. and not just obj.

CHECK DEMO

edited Oct 01 '12 at 21:16

answered Oct 01 '12 at 21:09

Sushanth --

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score 0 · Answer 2 · answered Oct 01 '12 at 21:08

0

Don't use jQuery, just use JSON.parse(). Then, get it using obj.survey.id.

var obj = JSON.parse(userbookingstring);
alert(obj[0].survey.id);

answered Oct 01 '12 at 21:08

saml

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Why does he have to use `JSON.parse()`? Seems to already be JSON? – Explosion Pills Oct 01 '12 at 21:09
Hi, thanks for your response. When i try the following line: var obj = JSON.parse(JSON.stringify(userbooking)); alert(obj.Survey.id); i get the following error: Uncaught TypeError: Cannot read property 'id' of undefined – Tyler Evans Oct 01 '12 at 21:11
JavaScript is case-sensitive. 'obj.Survey' is not defined, 'obj.survey' is. – saml Oct 01 '12 at 21:12
still i get the same error:/ Uncaught TypeError: Cannot read property 'id' of undefined – Tyler Evans Oct 01 '12 at 21:13
Also, why are you using JSON.parse(JSON.stringify(userbooking))? That takes an Object, converts it to a JSON string, then converts it back to and Object. That's unnecessary. – saml Oct 01 '12 at 21:14
obj is an Array. you need to access the first element using: obj[0].survey.id – saml Oct 01 '12 at 21:16

Access Cascaded JSON in javascript

2 Answers2