How do I prevent default behaviour for an event in Opera?

Robert S · Jul 29, 2006

I am using the following to prevent the Enter key from submitting my
form (this would have undesirable results):

(index.html)
<body onkeydown="rejectEnter( event )">

(functions.js)
function rejectEnter( oEvent )
{
if ( 13 == oEvent.keyCode )
{
try
{
oEvent.preventDefault();
}
catch ( oError )
{
oEvent.returnValue = false;
}
}
}

This works fine in Firefox, IE6 and Konqueror, but it does not reject
the keypress in Opera (9.0). Is there an easy way of doing this in
Opera using code similar to the above?

It looks like it execultes the line "oEvent.preventDefault();", but it
does not have the desired effect.

Martin Honnen · Jul 29, 2006

Robert S wrote:

This works fine in Firefox, IE6 and Konqueror, but it does not reject
the keypress in Opera (9.0). Is there an easy way of doing this in
Opera using code similar to the above?

Try to use preventDefault in onkeypress and not in onkeydown, that might
help.

Robert S · Jul 29, 2006

Try to use preventDefault in onkeypress and not in onkeydown, that might

help.

This seems to work:

form action="recipients.php" method="post" onkeypress="rejectEnter(
event )">

I've experimented with a few things - its hard to know what
consistently works. Sometimes when I make a small change to
functions.js it stops working. Think I'll leave it alone now.

Philipp · Jul 30, 2006

Did you already try just returning false?

function rejectEnter( oEvent )
{
if ( 13 == oEvent.keyCode )
{
try
{
oEvent.preventDefault();
}
catch ( oError )
{
oEvent.returnValue = false;
}
return false;
}
}

RobG · Jul 31, 2006

Robert said:
I am using the following to prevent the Enter key from submitting my
form (this would have undesirable results):

Why not use onsubmit and a form validation routine?

(index.html)
<body onkeydown="rejectEnter( event )">

(functions.js)
function rejectEnter( oEvent )
{
if ( 13 == oEvent.keyCode )
{
try
{
oEvent.preventDefault();
}
catch ( oError )
{
oEvent.returnValue = false;
}
}
}

try..catch is really just a kludge where nothing better is available,
feature detection is all the rage so why not use it:

function rejectEnter(oEvent)
{
if ('number' == typeof oEvent.keyCode
&& 13 == oEvent.keyCode){
if ('function' == typeof oEvent.preventDefault){
oEvent.preventDefault();
} else {
oEvent.returnValue = false;
}
}
return false;
}

This works fine in Firefox, IE6 and Konqueror, but it does not reject
the keypress in Opera (9.0). Is there an easy way of doing this in
Opera using code similar to the above?

Presumably users are familiar with the fact that pressing 'enter' will
sumbit the form, why change the browser's default behaviour and confuse
them? Use an onsubmit handler and cancel the submit if they havn't
finished filling in the form.

It looks like it execultes the line "oEvent.preventDefault();", but it
does not have the desired effect.

Returning false from an onsubmit handler should work more reliably than
attempting to cancel default behaviour by intercepting key presses
(noting that client-side validation is helpful but unreliable).

Robert S · Aug 1, 2006

function rejectEnter(oEvent)

{
if ('number' == typeof oEvent.keyCode
&& 13 == oEvent.keyCode){
if ('function' == typeof oEvent.preventDefault){
oEvent.preventDefault();
} else {
oEvent.returnValue = false;
}
}
return false;
}

Thanks. This seems to work. The page is for internal office work, so
the fact that the Enter key doesn't work won't be a major problem.

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How do I prevent default behaviour for an event in Opera?

Robert S

Martin Honnen

Robert S

Philipp

RobG

Robert S

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