(JavaScript) JSON: Miscellaneous Operations

Demonstrates a variety of JSON API methods. This example uses the following JSON document:

{
   "alphabet": "abcdefghijklmnopqrstuvwxyz",
   "sampleData" : {
           "pi": 3.14,
	   "apple": "juicy",
	   "hungry": true,
	   "withoutValue": null,
           "answer": 42
          
	}
}

Note: This example requires Chilkat v11.0.0 or greater.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

var success = false;

var json = new CkJsonObject();
json.EmitCompact = false;

// Assume the file contains the data as shown above..
success = json.LoadFile("qa_data/json/sample2.json");
if (success == false) {
    console.log(json.LastErrorText);
    return;
}

// Get the "sampleData" object:
var sampleData = new CkJsonObject();
json.ObjectOf2("sampleData",sampleData);

// Demonstrate BoolAt and BoolOf
console.log("hungry: " + sampleData.BoolOf("hungry"));
console.log("hungry: " + sampleData.BoolAt(2));

// StringOf returns the value as a string regardless of it's actual type:
console.log("pi: " + sampleData.StringOf("pi"));
console.log("answer: " + sampleData.StringOf("answer"));
console.log("withoutValue: " + sampleData.StringOf("withoutValue"));
console.log("hungry: " + sampleData.StringOf("hungry"));

// Demonstrate IsNullOf / IsNullAt
console.log("withoutValue is null? " + sampleData.IsNullOf("withoutValue"));
console.log("withoutValue is null? " + sampleData.IsNullAt(3));
console.log("apple is null? " + sampleData.IsNullOf("apple"));
console.log("apple is null? " + sampleData.IsNullAt(1));

// IntOf
console.log("answer: " + sampleData.IntOf("answer"));

// SetNullAt, SetNullOf
// Set "pi" to null
success = sampleData.SetNullAt(0);
// Set "answer" to null
success = sampleData.SetNullOf("answer");

// Show the changes:
console.log(json.Emit());

// Restore pi and apple:
success = sampleData.SetNumberAt(0,"3.14");
success = sampleData.SetNumberOf("answer","42");

// Show the changes:
console.log(json.Emit());

// Add a null value named "afterApple" just after "apple"
success = sampleData.AddNullAt(2,"afterApple");

// Add a boolean value just after "pi"
success = sampleData.AddBoolAt(1,"afterPi",false);

// Examine the changes..
console.log(json.Emit());