add an object to an object javascript code example

Example 1: how to add property to object in javascript

var data = {
    'PropertyA': 1,
    'PropertyB': 2,
    'PropertyC': 3
};

data["PropertyD"] = 4;

// dialog box with 4 in it
alert(data.PropertyD);
alert(data["PropertyD"]);

Example 2: js push in object

let obj = {};
let objToAdd1 = { prop1: "1", prop2: "2" };
let objToAdd2 = { prop3: "3", prop4: "4" };

// obj variabile could be empty or not, it's the same
obj = { ...obj, ...objToAdd1 };
obj = { ...obj, ...objToAdd2 };

// Note that i used the spread operator... This syntax is available
// only for the most recent js ES (from ES6 on, if i'm not wrong) :)

console.log(obj);

Example 3: javascript add to object

var element = {}, cart = [];
element.id = id;
element.quantity = quantity;
cart.push(element);

// Array of Objects in form {element: {id: 10, quantity: 10} }
var element = {}, cart = [];
element.id = id;
element.quantity = quantity;
cart.push({element: element});

Example 4: javascript append to object

How about storing the alerts as records in an array instead of properties of a single object ?

var alerts = [ 
    {num : 1, app:'helloworld',message:'message'},
    {num : 2, app:'helloagain',message:'another message'} 
]
And then to add one, just use push:

alerts.push({num : 3, app:'helloagain_again',message:'yet another message'});

Example 5: js add data in object

var element = {}, cart = [];
element.id = id;
element.quantity = quantity;
cart.push(element);