206 Part III .Document Objects Reference the event (Hp web site)
206 Part III .Document Objects Reference the event handler to more form elements, predominantly on the Windows operating system because that OS has a user interface clue (the dotted rectangle) when items such as buttons and links receive focus (so that users may act upon them by pressing the keyboard s spacebar). For IE5, the onFocus event handler is available to virtually every HTML element. For most of those elements, however, you cannot use blur and focus unless you assign a value to the TABINDEXattribute of the element s tag. For example, if you assign TABINDEX=1inside a
tag, the user can bring focus to that paragraph (highlighted with the dotted rectangle in Windows) by clicking the paragraph or pressing the Tab key until that item receives focus in sequence. If you plan to use the onFocus event handler on window or text-oriented input elements, be aware that there might be some unexpected and undesirable consequences of scripting for the event. For example, in IE5 (but not IE4), some object almost always has focus. In most cases, the window has focus but loses it when the user clicks an element wired to receive focus. Clicking anywhere on an unwired element brings focus back to the windowobject. Similarly, the interaction between onBlur, onFocus, and the alert dialog box can be problematic with text input elements. IE5.5 adds the onActivate event handler, which fires immediately before the onFocus event handler. You can use one or the other, but there is little need to include both event handlers for the same object unless you temporarily wish to block an item from receiving focus. To prevent an object from receiving focus in IE5.5, include an event.returnValue=false statement in the onActivate event handler for the same object. In older browsers, you can usually get away with assigning onFocus= this.blur() as an event handler for elements such as form controls. However, this is not a foolproof way to prevent a user from changing a control s setting. Unfortunately, there are few reliable alternatives. Example on the CD-ROM Related Items: onActivate, onBlur, onDeactivate event handlers. onHelp NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5 Compatibility The onHelp event handler fires in Windows whenever an element of the document has focus and the user presses the F1 function key on a Windows PC. As of IE5/Mac, the event fires only on the window (in other words, event handler specified in the
tag) and does so via the dedicated Help key on a Mac keyboard. Browser Help menu choices do not activate this event. To prevent the browser s Help window from appearing, the event handler must evaluate to return false (for IE4+) or set the event.returnValue property to false(IE5+). Because the On the CD-ROM elementObject.onHelpYou want to have a cheap webhost for your apache application, then check apache web hosting services.