Json object for nested class

Question

I want to create a json object in javascript/jquery. For this Class A i want its json object.

Class A
{
string test1;
B b1;
}

Class B
{
string test2;
List< C> collectionOfCType;
}

Class C
{
  int h;int w;
}

Inside my js- I am able to get json object having value of test1 of A but b1 value is showing undefined.

var A=
    {
        "test1": "abc",
        "b1": B
    }

var B =
    {
        "test2": "def",
        ... so on ..
     }

Please help!

Is b1 supposed to be an instance of B? Where do you construct these objects, where does the string "abc" come from? — Bergi
– Bergi, Commented Nov 20, 2013 at 13:30

Guilherme Soares · Accepted Answer · 2013-11-20 12:45:26Z

3

You need change the order because when you declare var A the variable B even isn`t defined

var B =
    {
        "test2": "def",
        ... so on ..
     }

var A=
    {
        "test1": "abc",
        "b1": B
    }

answered Nov 20, 2013 at 12:45

Guilherme Soares

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Comments

Adassko · Accepted Answer · 2013-11-20 12:45:47Z

0

just do:

var A=
    {
        "test1": "abc",
        "b1":
        {
            "test2": "def",
            "collectionOfCType":
                [
                    {
                        "h": 100,
                        "w": 200
                    },
                    {
                        "h": 50,
                        "w": 80
                    }
                ]
        }
    }

answered Nov 20, 2013 at 12:45

Adassko

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Comments

stackunderflow · Accepted Answer · 2013-11-20 13:30:42Z

Here's a way to model and debug this:

I encapsulated the code in a function scope so that it cannot step on global variable A, B, and C.

Also added exception reporting to catch some syntax errors when playing with changes to the code.

As you move the order of declarations you will find that you can get partially initialized data structures, as @Guilherme pointed out before me.

Also, the quoting of properties is not necessary in JavaScript, JSON.stringify will do so for you.

Code

(function() {
    try {
        var C = {
            h: 4,
            w: 3
        };
        var cArray = [
            C, 
            C, 
            C];
        var B = {
            test2: "def",
            arrayOfC: cArray
        };
        var A = {
            test1: "abc",
            b1: B
        };
        console.log(JSON.stringify(A, null, 2));
        // window.alert(JSON.stringify(A, null, 2));
    } catch (exception) {
        console.error(exception.stack);
    }
})();

Output

{
  "test1": "abc",
  "b1": {
    "test2": "def",
    "arrayOfC": [
      {
        "h": 4,
        "w": 3
      },
      {
        "h": 4,
        "w": 3
      },
      {
        "h": 4,
        "w": 3
      }
    ]
  }
}

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