looping through json in javascript

Question

"obj" : {

"a" : [
      { "name" : "value" },
      { "name" : "value" },
      { "name" : "value }
     ],
"b" : [
      { "name" : "value" },
      { "name" : "value" },
      { "name" : "value" }
      ]
};

I have my json structured similarly to this in that "a" and "b" are objects that contain arrays which also contain objects. I'm not very good with iteration/loops. I mainly would like to get the value of "name". any help? THANKS IN ADVANCE!

Answer 1

var foo = JSON.parse(json);

for(var i in foo){
    for(var y = 0; y < foo[i].length; y++)
        alert(foo[i][y].name);
}

https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/JSON/parse

Answer 2

You can use forEach :

Object.keys( json.obj ).forEach(function ( key ) {
    json.obj[ key ].forEach(function ( obj ) {
        // retrieve obj.name here
    });
});

Live demo: http://jsfiddle.net/4Mrkp/

Answer 3

Using underscore.js ->

var obj = {

"a" : [
      { "name" : "value" },
      { "name" : "value" },
      { "name" : "value" }
     ],
"b" : [
      { "name" : "value" },
      { "name" : "value" },
      { "name" : "value" }
      ]
};

var names = _.chain(obj).values().flatten().pluck('name').value();