Question

I wanted to know how its possible to call a javascript function , as soon as one presses the “return(enter” key,just as in chat systems

Answer 1

window.onkeypress = function(e)
{
 switch(e.keyCode e.which) //[2]
 {
  case NUMPAD_ENTER_KEY_CODE: //[1]
  case ENTER_KEY_CODE:
   doSomething();
   return false;
  default:
   if (window.console) console.log(e.keyCode e.which); //[2]
   return true;
 }
}

this is then expandable to work for any number of key codes. You can also try the onKeyDown or onKeyUp events.

Remember to replace ENTER_KEY_CODE with the actual key code (32?). This should print out the keyCodes of any keys that are not enter so that you can figure out their keyCodes.

Edit:
[1] I forgot to mention you may want to detect the numpad-enter keycode.
[2] I forgot that onkeypress uses e.which to store the keyCode