How to Loop Through a JavaScript Object

Question

I used

console.log(response);

and got the following in console (in Firebug). How do I loop through to check if "LMNOPQ" exists?

data        [Object { name="Excel in ABCD", category="Book", id="327361517327399", more...}, Object { name="LMNOPQ", category="Product/service", id="175625882542984", more...}, Object { name="UVWXYZ", category="Book", id="260641707360118", more...}, 7 more...]
            0       Object { name="Excel in ABCD", category="Book", id="327361517327399", more...}
            category        "Book"
            created_time        "2012-04-04T05:31:04+0000"
            id      "327361517327399"
            name        "Excel in ABCD"
            1       Object { name="LMNOPQ", category="Product/service", id="175625882542984", more...}
            2       
Object { name="UVWXYZ", category="Book", id="260641707360118", more...}

Then as suggested by Baptiste Pernet, I tried the following:

for(var i in response) {
    console.log(response[i].name);//gives me undefined
    console.log(response[i]);//gives me another object (it is nested, check below)
}

[Object { name="Excel in ABCD", category="Book", id="327361517327399", more...}, Object { name="LMNOPQ", category="Product/service", id="175625882542984", more...}, Object { name="UVWXYZ", category="Book", id="260641707360118", more...},

How do I get this name now? I'm stuck at:

console.log(response[i]);

What should I write in order to get the properties of nested objects? Another loop?

You may Use jsonpath library

kirilloid
– kirilloid

2012-04-05 07:47:15 +00:00
Commented Apr 5, 2012 at 7:47 — kirilloid
– kirilloid, Commented Apr 5, 2012 at 7:47
Give us the url of the jsonp please

mplungjan
– mplungjan

2012-04-05 08:14:16 +00:00
Commented Apr 5, 2012 at 8:14 — mplungjan
– mplungjan, Commented Apr 5, 2012 at 8:14

Baptiste Pernet · Accepted Answer · 2012-04-05 14:03:40Z

2

You should try to use JSON.stringify(response) and then this site to visualize the result. It is far more standard than the format you provide.

From what you gave, it seems that you have a member called data that contains an array (again, I am not sure because you didn't provide a good format to describe you javascript object).

So let's try

for(var i in response.data) {
  if (response.data[i].name == 'LMOPQ') {
    return true
  }
}

return false;

edited Apr 5, 2012 at 14:03

answered Apr 5, 2012 at 7:38

Baptiste Pernet

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8 Comments

Royi Namir Over a year ago

nice.... but isnt it a strange syntax ? data [Object { what does the Object word doing there ?

Baptiste Pernet Over a year ago

I think this is the FF console log, it says that it is an array of object data[Object{...}, Object{...}, ...]

practitioner Over a year ago

yes Baptiste Pernet, its FF console log. I'll try this and get back

Baptiste Pernet Over a year ago

well, I used like, because you wrote 'like' in your question... in console.log(response[like]);

practitioner Over a year ago

Apologies, thats my mistake, it was just console.log(response);

|

Rituparna Kashyap · Accepted Answer · 2012-04-05 07:41:04Z

-1

you can use

for (var prop in Object) {
    if(prop == "LMNOPQ") {
        // Do something
    }
}

or you can use if( response[like].hasOwnProperty("LMNOPQ") ) alternatively.

answered Apr 5, 2012 at 7:41

Rituparna Kashyap

1,50713 silver badges19 bronze badges

3 Comments

practitioner Over a year ago

Well, I'm fetching facebook likes by a user who has authenticated us already and checking if my page exists in it.

practitioner Over a year ago

FB.api('/me/likes, function(response) { for(var i in response[like]) { console.log(response[like][i].name); } });

practitioner Over a year ago

extremely sorry for the confusion, it was just console.log(response); that logged everything I mentioned in my question, originally.

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