JavaScript objects

Almost everything you can reference in a javascript program is an "object"

Objects have

• properties (some settable, others read-only)
• methods (subroutines; things the object can do)
• event handlers
• sub-objects (creating an object hierarchy)

The main JavaScript object hierarchy:

• navigator
• window
  • location
  • history
  • document (subobjects correspond to tags)
    • anchors
    • images
    • forms
    • links

Examples:

document.write	method associated with document object
navigator.appName	property of navigator object (readonly)
window.document.forms[0]. elements[1].value	value of the 2nd field in the first form of the document (r/w property)
document.forms[0]. email.value	value of "email" element in first form

JavaScript events