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1

I have a json file returned on my javascript code. The file looks like this :

{
    "data": [
        {
            "id": "594984240522886",
            "from": {
                "id": "593959083958735",
                "category": "Community",
                "name": "Decoc"
            },
            "name": "Ducks",
            "description": "ducks",
            "link": "http://www.facebook.com/album.php?fbid=594984240522886&id=593959083958735&aid=1073741834",
            "cover_photo": "594984260522884",
            "count": 4,
            "type": "normal",
            "created_time": "2013-06-13T15:12:22+0000",
            "updated_time": "2013-06-13T15:12:40+0000",
            "can_upload": false
        },
        {
            "id": "593963787291598",
            "from": {
                "id": "593959083958735",
                "category": "Community",
                "name": "Decoc"
            },
            "name": "Profile Pictures",
            "link": "http://www.facebook.com/album.php?fbid=593963787291598&id=593959083958735&aid=1073741832",
            "cover_photo": "593963797291597",
            "count": 1,
            "type": "profile",
            "created_time": "2013-06-11T16:52:29+0000",
            "updated_time": "2013-06-11T16:52:31+0000",
            "can_upload": false
        },
        {
            "id": "593963467291630",
            "from": {
                "id": "593959083958735",
                "category": "Community",
                "name": "Decoc"
            },
            "name": "Goats",
            "description": "goats",
            "link": "http://www.facebook.com/album.php?fbid=593963467291630&id=593959083958735&aid=1073741831",
            "cover_photo": "593963477291629",
            "count": 7,
            "type": "normal",
            "created_time": "2013-06-11T16:51:56+0000",
            "updated_time": "2013-06-11T16:52:02+0000",
            "can_upload": false
        },
        {
            "id": "593962700625040",
            "from": {
                "id": "593959083958735",
                "category": "Community",
                "name": "Decoc"
            },
            "name": "Dogs",
            "description": "dogs",
            "link": "http://www.facebook.com/album.php?fbid=593962700625040&id=593959083958735&aid=1073741830",
            "cover_photo": "593962710625039",
            "count": 10,
            "type": "normal",
            "created_time": "2013-06-11T16:50:27+0000",
            "updated_time": "2013-06-11T16:50:37+0000",
            "can_upload": false
        },
        {
            "id": "593961937291783",
            "from": {
                "id": "593959083958735",
                "category": "Community",
                "name": "Decoc"
            },
            "name": "Cows",
            "description": "Cows",
            "link": "http://www.facebook.com/album.php?fbid=593961937291783&id=593959083958735&aid=1073741829",
            "cover_photo": "593961983958445",
            "count": 5,
            "type": "normal",
            "created_time": "2013-06-11T16:48:26+0000",
            "updated_time": "2013-06-11T16:49:32+0000",
            "can_upload": false
        }
    ],
    "paging": {
        "cursors": {
            "after": "NTkzOTYxOTM3MjkxNzgz",
            "before": "NTk0OTg0MjQwNTIyODg2"
        }
    }
}

I would like to loop inside the "data" and see how many different data elements exist(as you see each element has an id , from , name , description..) . How can i do that with javascript?

share|improve this question
    
What have you tried so far ? –  Ani Jun 17 '13 at 16:13
    
google.fr/search?q=manipulate+json –  pataluc Jun 17 '13 at 16:14
    
Look at the length property of the "data" array. –  Elias Zamaria Jun 17 '13 at 16:16
    
What is the main json object name ? you can loop thru using for loop this : for(i=0; i<jsonObj.data.length; i++) –  Ani Jun 17 '13 at 16:17
    
Thank you very much mikez302. Thats indeed what i needed. I was thinking about making foreach loops but this one is 100 times cleaner. –  Jonh Smid Jun 17 '13 at 16:17

1 Answer 1

up vote 1 down vote accepted

You can try the following code:

for(i=0;json.data.length;i++){
    var element = json.data[i];
}

or also in this other way:

for (i in json.data) {
    if (json.data.hasOwnProperty(i)) {
        var element = json.data[i];
    }
}
share|improve this answer
    
Why the if (json.data.hasOwnProperty(i)) ? Your for statement already assign the right value in the i variable, so you don't have to perform check, it will always be true. –  DaFunix Jun 17 '13 at 16:35
    
Thank you for the answer. –  Jonh Smid Jun 17 '13 at 16:35
    
Using for ... in with arrays is generally a bad practice. There is no guarantee that you will get the elements in array order. Array.forEach however, would be a good choice. –  Jeremy J Starcher Jun 17 '13 at 16:39
1  
@DaFunix - hasOwnProperty is used to filter out anything that has been been monkey-patched into the Array.prototype. For instance, if there was a shim to add a forEach or indexOf method. –  Jeremy J Starcher Jun 17 '13 at 16:41

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