JAVASCRIPT TUTORIALS - Javascript - Objects

Javascript - Objects

Example:


var str = document.title;

Example:


document.write("This is test");

The


var employee = new Object();
var books = new Array("C++", "Perl", "Java");
var day = new Date("August 15, 1947");

Example 1:


<html>
<head>
<title>User-defined objects</title>
<script type="text/javascript">
var book = new Object();   // Create the object
    book.subject = "Perl"; // Assign properties to the object
    book.author  = "Mohtashim";
</script>
</head>
<body>
<script type="text/javascript">
   document.write("Book name is : " + book.subject + "<br>");
   document.write("Book author is : " + book.author + "<br>");
</script>
</body>
</html>

Example 2:


<html>
<head>
<title>User-defined objects</title>
<script type="text/javascript">
function book(title, author){
    this.title = title; 
    this.author  = author;
}
</script>
</head>
<body>
<script type="text/javascript">
   var myBook = new book("Perl", "Mohtashim");
   document.write("Book title is : " + myBook.title + "<br>");
   document.write("Book author is : " + myBook.author + "<br>");
</script>
</body>
</html>

Example:


<html>
<head>
<title>User-defined objects</title>
<script type="text/javascript">

// Define a function which will work as a method
function addPrice(amount){
    this.price = amount; 
}

function book(title, author){
    this.title = title; 
    this.author  = author;
    this.addPrice = addPrice; // Assign that method as property.
}

</script>
</head>
<body>
<script type="text/javascript">
   var myBook = new book("Perl", "Mohtashim");
   myBook.addPrice(100);
   document.write("Book title is : " + myBook.title + "<br>");
   document.write("Book author is : " + myBook.author + "<br>");
   document.write("Book price is : " + myBook.price + "<br>");
</script>
</body>
</html>

Syntax:


with (object){
    properties used without the object name and dot
}

Example:


<html>
<head>
<title>User-defined objects</title>
<script type="text/javascript">

// Define a function which will work as a method
function addPrice(amount){
    with(this){
       price = amount; 
    }
}
function book(title, author){
    this.title = title; 
    this.author  = author;
    this.price = 0;
    this.addPrice = addPrice; // Assign that method as property.
}
</script>
</head>
<body>
<script type="text/javascript">
   var myBook = new book("Perl", "Mohtashim");
   myBook.addPrice(100);
   document.write("Book title is : " + myBook.title + "<br>");
   document.write("Book author is : " + myBook.author + "<br>");
   document.write("Book price is : " + myBook.price + "<br>");
</script>
</body>
</html>