JSON: Syntax dan How To

March 12, 2016

JSON syntax is derived from JavaScript object notation syntax:

  • Data is in name/value pairs
  • Data is separated by commas
  • Curly braces hold objects
  • Square brackets hold arrays

ok?

Because JSON syntax is derived from JavaScript object notation, very little extra software is needed to work with JSON within JavaScript.

With JavaScript you can create an array of objects and assign data to it, like this:

var employees = [
{“firstName”:”John”, “lastName”:”Doe”},
{“firstName”:”Anna”, “lastName”:”Smith”},
{“firstName”:”Peter”,”lastName”: “Jones”}
];

Bisa diakses dengan cara:

employees[0].firstName + ” “ + employees[0].lastName; // returns John Doe

employees[0][“firstName”] + ” “ + employees[0][“lastName”];

Modifikasi bisa dilakukan dengan mengakses sbb:

employees[0].firstName = “Gilbert”;

employees[“firstName”].firstName = “Gilbert”;

Contoh how to:

<!DOCTYPE html>
<html>
<body>

<h2>Create Object from JSON String</h2>

<p id=”demo”></p>

var text = ‘{“employees”:[‘ +
‘{“firstName”:”John”,”lastName”:”Doe” },’ +
‘{“firstName”:”Anna”,”lastName”:”Smith” },’ +
‘{“firstName”:”Peter”,”lastName”:”Jones” }]}’;

obj = JSON.parse(text);
document.getElementById(“demo”).innerHTML =
obj.employees[1].firstName + ” ” + obj.employees[1].lastName;

</body>
</html>

 

jangan lupa. kuncinya sebetulnya di : document.getElementById(“demo”).innerHTML =

Gampang kan?

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