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CHAPTER 2 JAVASCRIPT SYNTAX
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Person.age If there were functions associated with the Person object say, walk() or sleep() then these would be methods of the object: Person.walk() Person.sleep() Now all these properties and methods are grouped together under one term: Person. To use the Person object to describe a specific person, you would create an instance of Person. An instance is an individual example of a generic object. For instance, you and I are both people, but we are also both individuals. We probably have different properties (our ages may differ, for instance), yet we are both examples of an object called Person. A new instance is created using the new keyword: var jeremy = new Person; This would create a new instance of the object Person, called jeremy. We could use the properties of the Person object to retrieve information about jeremy: jeremy.age jeremy.mood We ve used the imaginary example of a Person object just to demonstrate objects, properties, methods, and instances. In JavaScript, there is no Person object. It is possible for you to create your own objects in JavaScript. These are called user-defined objects. But that s quite an advanced subject that we don t need to deal with for now. Fortunately, JavaScript is like one of those TV chefs who produce perfectly formed creations from the oven, declaring, Here s one I made earlier. JavaScript comes with a range of premade objects that you can use in your scripts. These are called native objects.
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Native objects
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You ve already seen objects in action. Array is an object. Whenever you initialize an array using the new keyword, you are creating a new instance of the Array object: var beatles = new Array(); When you want to find out how many elements are in an array, you do so by using the length property: beatles.length; The Array object is an example of a native object supplied by JavaScript. Other examples include Math and Date, both of which have very useful methods for dealing with numbers and dates respectively. For instance, the Math object has a method called round which can be used to round up a decimal number: var num = 7.561; var num = Math.round(num); alert(num); The Date object can be used to store and retrieve information about a specific date and time. If you create a new instance of the Date object, it will be automatically be prefilled with the current date and time: var current_date = new Date();
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CHAPTER 2 JAVASCRIPT SYNTAX
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The date object has a whole range of methods like getDay(), getHours(), and getMonth() that can be used to retrieve information about the specified date. getDay(), for instance, will return the day of the week of the specified date: var today = current_date.getDay(); Native objects like this provide invaluable shortcuts when you re writing JavaScript.
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Host objects
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Native objects aren t the only kind of premade objects that you can use in your scripts. Another kind of object is supplied not by the JavaScript language itself, but by the environment in which it s running. In the case of the Web, that environment is the web browser. Objects that are supplied by the web browser are called host objects. Host objects include Form, Image, and Element. These objects can be used to get information about forms, images, and form elements within a web page. We re not going to show you any examples of how to use those host objects. There is another object that can be used to get information about any element in a web page that you might be interested in: the document object. For the rest of this book, we are going to be looking at lots of properties and methods belonging to the document object.
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