(JavaScript) Modify Parts of JSON Document

Demonstrates how to modify parts of a JSON document. This example uses the following JSON document:

{
   "fruit": [
      	{
         "kind": "apple",
	 "count": 24,
	 "fresh": true,
	 "extraInfo": null,
	 "listA": [ "abc", 1, null, false ],
	 "objectB": { "animal" : "monkey" }
      	},
	{
         "kind": "pear",
	 "count": 18,
	 "fresh": false,
	 "extraInfo": null
	 "listA": [ "xyz", 24, null, true ],
	 "objectB": { "animal" : "lemur" }
	}
    ],
    "list" : [ "banana", 12, true, null, "orange", 12.5, { "ticker": "AAPL" }, [ 1, 2, 3, 4, 5 ] ],
    "alien" : true
}

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();

// Load the JSON from a file.
success = json.LoadFile("qa_data/json/modifySample.json");
if (success == false) {
    console.log(json.LastErrorText);
    return;
}

// This example will not check for errors (i.e. null / false / 0 return values)...

// Get the "list" array:

var listA = new CkJsonArray();

json.ArrayOf2("list",listA);

// Modify values in the list.

// Change banana to plantain
success = listA.SetStringAt(0,"plantain");

// Change 12 to 24
success = listA.SetIntAt(1,24);

// Change true to false
success = listA.SetBoolAt(2,false);

// Is the 3rd item null?
var bNull = listA.IsNullAt(3);

// Change "orange" to 32.
success = listA.SetIntAt(4,32);

// Change 12.5 to 31.2
success = listA.SetNumberAt(5,"31.2");

// Replace the { "ticker" : "AAPL" } object with { "ticker" : "GOOG" }
// Do this by deleting, then inserting a new object at the same location.
success = listA.DeleteAt(6);
var tickerObj = new CkJsonObject();
listA.AddObjectAt2(6,tickerObj);

success = tickerObj.AppendString("ticker","GOOG");

// Replace "[ 1, 2, 3, 4, 5 ]" with "[ "apple", 22, true, null, 1080.25 ]"
success = listA.DeleteAt(7);
var aa = new CkJsonArray();
listA.AddArrayAt2(7,aa);

success = aa.AddStringAt(-1,"apple");
success = aa.AddIntAt(-1,22);
success = aa.AddBoolAt(-1,true);
success = aa.AddNullAt(-1);
success = aa.AddNumberAt(-1,"1080.25");

// Get the "fruit" array
var aFruit = new CkJsonArray();
json.ArrayAt2(0,aFruit);

// Get the 1st element:
var appleObj = new CkJsonObject();
aFruit.ObjectAt2(0,appleObj);

// Modify values by member name:
success = appleObj.SetStringOf("fruit","fuji_apple");
success = appleObj.SetIntOf("count",46);
success = appleObj.SetBoolOf("fresh",false);
success = appleObj.SetStringOf("extraInfo","developed by growers at the Tohoku Research Station in Fujisaki");

// Modify values by index:

var pearObj = new CkJsonObject();
aFruit.ObjectAt2(1,pearObj);

success = pearObj.SetStringAt(0,"bartlett_pear");
success = pearObj.SetIntAt(1,12);
success = pearObj.SetBoolAt(2,false);
success = pearObj.SetStringAt(3,"harvested in late August to early September");

json.EmitCompact = false;
console.log(json.Emit());