How do I reference a nested array within my JSON data?

Question

I need assistance in accessing a nested array located my JSON Data Set. Here is the first entry of my top-level JSON array:

{
    "pingFeed": [{
        "header": "Get Drinks?",
        "picture": "images/joe.jpg",
        "location": "Tartine's, SF",
        "time": "Tomorrow Night",
        "name": "Joe Shmoe",
        "pid":
        "123441121",
        "description": "Let's drop some bills, yal!",
        "comments": [{
            "author": "Joe S.",
            "text": "I'm Thirsty"
        },
        {
            "author": "Adder K.",
            "text":
            "Uber Narfle"
        },
        {
            "author": "Sargon G.",
            "text": "taeber"
        },
        {
            "author": "Randy T.",
            "text": "Powdered Sugar"
        },
        {
            "author": "Salvatore D.",
            "text":
            "Chocolate with Sprinkles"
        },
        {
            "author": "Jeff T.",
            "type": "Chocolate"
        },
        {
            "author": "Chris M.",
            "text": "Maple"
        }],
        "joined": false,
        "participants": [
        "Salvatore G.", "Adder K.", "Boutros G."],
        "lat": 37.25,
        "long": 122,
        "private": true
    }]
}

I would like to know how I can access the comments and participants data using the following notation:

for (var k = 0; k < pingFeed.length ; k++) {
    console.log(pingFeed[k].comments);
    console.log(pingFeed[k].participants);
 }

Currently this form of dot notation is working for the other entries in the JSON array... I am looking to return all of these data as Strings.

Tartine is a great restaurant, sorry I couldn't resist.

JP Silvashy
– JP Silvashy

2010-09-13 23:05:27 +00:00
Commented Sep 13, 2010 at 23:05 — JP Silvashy
– JP Silvashy, Commented Sep 13, 2010 at 23:05

palswim · Accepted Answer · 2010-09-13 22:58:46Z

1

I'm not sure quite what you're looking to do, but perhaps this will point you in the right direction:

for (var k = 0; k < pingFeed.length; k++) {
    for (var i = 0; i < pingFeed[k].comments.length; i++) {
        var oComments = pingFeed[k].comments[i];
        console.log( oComments.author + ": " + oComments.text );
    }
    console.log(pingFeed[k].participants.join(", "));
}

answered Sep 13, 2010 at 22:58

palswim

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Felix Kling · Accepted Answer · 2010-09-13 23:03:45Z

1

Well, comments and participants are arrays, so you can access them like normal arrays, e.g.:

for (var k = 0; k < pingFeed.length ; k++) {
    var comments = pingFeed[k].comments;
    for(var i = 0, length = comments.length; i < length; ++i) {
        console.log(comments[i]);
    }
}

edited Sep 13, 2010 at 23:03

answered Sep 13, 2010 at 22:58

Felix Kling

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Comments

Nikita Rybak · Accepted Answer · 2010-09-13 22:56:18Z

0

There's nothing wrong with your code: pingFeed[k].comments will return array and pingFeed[k].comments[0] will return first comment from that array.

Try here
http://jsfiddle.net/U8udd/

answered Sep 13, 2010 at 22:56

Nikita Rybak

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