JavaScript

Get the Root of a JSON Document

See more JSON Examples

Demonstrates how to get back to the JSON root object from anywhere in the JSON document. This example uses the following JSON document:

{
  "flower": "tulip",
  "abc":
    {
    "x": [
       { "a" : 1 },
       { "b1" : 100, "b2" : 200 },
       { "c" : 3 }
    ],
    "y": 200,
    "z": 200
    }
}

JavaScript

var success = false;

var json = new CkJsonObject();

var jsonStr = "{\"flower\": \"tulip\",\"abc\":{\"x\": [{ \"a\" : 1 },{ \"b1\" : 100, \"b2\" : 200 },{ \"c\" : 3 }],\"y\": 200,\"z\": 200}}";

success = json.Load(jsonStr);
if (success == false) {
    console.log(json.LastErrorText);
    return;
}

// Get the "abc" object.
var abcObj = new CkJsonObject();
success = json.ObjectOf2("abc",abcObj);
if (success == false) {
    console.log(json.LastErrorText);
    return;
}

// Side note: The JSON of a sub-part of the document can be emitted from any JSON object:
abcObj.EmitCompact = false;
console.log(abcObj.Emit());

// Navigate to the "x" array
var xArray = new CkJsonArray();
abcObj.ArrayOf2("x",xArray);

// Navigate to the 2nd object contained within the array.  This contains members b1 and b2
var bObj = new CkJsonObject();
xArray.ObjectAt2(1,bObj);

// Show that we're at "b1/b2".
// The value of "b1" should be "200"
console.log("b2 = " + bObj.IntOf("b2"));

// Now go back to the JSON doc root:
var docRoot = new CkJsonObject();
bObj.GetDocRoot2(docRoot);

// We'll skip the null check and assume it's non-null...

// Pretty-print the JSON doc from the root to show that this is indeed the root.
docRoot.EmitCompact = false;
console.log(docRoot.Emit());