Learning Javascript

Learning programming

Javascript Hierarchy

The window contains frame objects. Then each frame contain a document with image,form,link objects. Form itself contains element objects.

Each object has properties and methods. You manipulate these objects in Javascript by sending commands to them with method invocation of the kind objectname.dothis();. For example document.write("This is HTML generated from Javascript");

The following events are defined:
Abort,Blur,Click,Change,DblClick,DragDrop,Error, Focus, KeyDown, KeyPress, KeyUp, Load, MouseDown, MouseMove, MouseOut, MouseOver, MouseUp, Move, Reset, Resize, Select, Submit, Unload.

Writing a Javascript program that interacts with the user means writing a set of functions and defining them as event handlers with the HTML tag onEventname = 'functionname()';

Another way to associate the function to the event is to define the property of the object associated with the event. objectname.oneventname=functionname;