JavaScript Examples Bible - UserWorks Technologies

window.onbeforeunload = verifyClose
Chapter 2 ✦ Window and Frame Objects (Chapter 16)
onBeforeUnload Event Handler
Use this button to navigate to the previous page:
Go Back
onHelp
NN2 NN3 NN4 NN6 IE3/J1 IE3/J2 IE4 IE5 IE5.5
Compatibility ✓ ✓ ✓
Example
The following script fragment can be embedded in the IE5-only modeless dialog
box code in Listing 16-44 to provide context-sensitive help within the dialog box.
Help messages for only two of the form elements are shown here, but in a real application
you add messages for the rest.
function showHelp() {
switch (event.srcElement.name) {
case “bgColor” :
alert(“Choose a color for the main window\’s background.”)
break
case “name” :
alert(“Enter your first name for a friendly greeting.”)
break
default :
alert(“Make preference settings for the main page styles.”)
}
event.returnValue = false
}
window.onhelp = showHelp
Because this page’s help focuses on form elements, the switch construction
cases are based on the name properties of the form elements. For other kinds of
pages, the id properties may be more appropriate.
189
windowObject.onHelp