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Firefox: Filter Extended Ascii from Form

My appologies if this ends up being a duplicate post. For some reason the
first post never showed up.

I've tried about 300 iterrations of this same ability, and none of them seem
to work in Firefox. Take the following code for example. It WILL stop me
from entering zero into the first text box, but it wont stop me from
entering extended ascii characters (which is the final goal).

Two items of note:
1) Typing ALT+0156 inputs "o". And strangely enough the statusbar text gets
set to "ALT0moz2 ALT0moz2 ALT0moz2". Only 3 ALT sequences show up when I
actually type 4 characters
2)Im working on a laptop that has no true numpad, so the '0' may be a result
of me having to hold down a special function key in order to enable a numpad
overlay.). So the check for altKey is correctly working, but attempting to
cancel the ALT event fails.

Does anyone know what is wrong with this, or have a working example that
stops ALT keypresses / Extended chars in FIREFOX ?
<script type="text/javascript">
if(document.add EventListener){
document.addEve ntListener("key press", HandleEnterKey, true);
}
else{
document.attach Event("onkeypre ss", HandleEnterKey) ;
}
// Handle the enter key for a section of a form, binding it to the provided
submit buton
function HandleEnterKey( event) {
var nav = window.Event ? true : false;
if (nav) {
return NetscapeEventHa ndler_KeyDown(e vent);
} else {
return MicrosoftEventH andler_KeyDown( );
}
}

function NetscapeEventHa ndler_KeyDown(e ) {
if (e.which == 48) {
window.status = window.status + e.which + "moz1 ";
e.returnValue = false;
e.cancel = true;
e.preventDefaul t();
return false;
} else if (e.altKey) {
window.status = window.status + "ALT" + e.which + "moz2 ";
e.returnValue = false;
e.cancel = true;
e.stopPropagati on();
e.preventDefaul t();
return false;
}
return true;
}
</script>
</head>
<body>
<form action="" id="theForm">
<input type="text" id="i1" name="i1" />
</form>
Sep 17 '05 #1
13 7784
bgbauer70 wrote:
[...]

// Handle the enter key for a section of a form, binding it to the provided
submit buton
function HandleEnterKey( event) {
var nav = window.Event ? true : false;
if (nav) {
return NetscapeEventHa ndler_KeyDown(e vent);
} else {
return MicrosoftEventH andler_KeyDown( );
}
}


I don't have a solution, but the following is possibly a better way to
determine appropriate the event model:

function HandleEnterKey( e ) {
if ( e ) {
return NetscapeEventHa ndler_KeyDown( e );
} else if ( window.event ) {
return MicrosoftEventH andler_KeyDown( );
}
}

If you are trying to restrict the characters that can be entered into a
text input, you are probably better off to use a regular expression to
test its value rather than trying to intercept keystrokes.

For example, I can enter a zero into the text input by copying and
pasting - ctrl+v or Edit->Paste - without using the zero key.

[...]

--
Rob
Sep 18 '05 #2
Hi Rob,

Is there a way to regex test based on ascii #? The problem is I just want
to filter out high ascii ( >127 ).
"RobG" <rg***@iinet.ne t.au> wrote in message
news:43******** *************** @per-qv1-newsreader-01.iinet.net.au ...
bgbauer70 wrote:
[...]

// Handle the enter key for a section of a form, binding it to the
provided
submit buton
function HandleEnterKey( event) {
var nav = window.Event ? true : false;
if (nav) {
return NetscapeEventHa ndler_KeyDown(e vent);
} else {
return MicrosoftEventH andler_KeyDown( );
}
}


I don't have a solution, but the following is possibly a better way to
determine appropriate the event model:

function HandleEnterKey( e ) {
if ( e ) {
return NetscapeEventHa ndler_KeyDown( e );
} else if ( window.event ) {
return MicrosoftEventH andler_KeyDown( );
}
}

If you are trying to restrict the characters that can be entered into a
text input, you are probably better off to use a regular expression to
test its value rather than trying to intercept keystrokes.

For example, I can enter a zero into the text input by copying and
pasting - ctrl+v or Edit->Paste - without using the zero key.

[...]

--
Rob

Sep 18 '05 #3
bgbauer70 wrote:
Is there a way to regex test based on ascii #? The problem is I just want
to filter out high ascii ( >127 ).


A string method:
String.charCode At(index)
Returns the decimal Unicode value, but for most characters it's the same
as AASCI.
Mick
Sep 18 '05 #4
bgbauer70 wrote:
Hi Rob,

Is there a way to regex test based on ascii #? The problem is I just want
to filter out high ascii ( >127 ).


There is no such thing as "high ascii" - it stops at 127, there are no
ASCII characters beyond it. As Mick suggests, you could use the Unicode
value to discriminate or you could make a regular expression that tests
for the 95 displayable ASCII characters. I think the former is simpler.

There is a relevant thread here in c.i.a.html:

<URL:http://groups.google.c o.uk/group/comp.infosystem s.www.authoring .html/browse_frm/thread/aa2508a3174597d 5/9d5f6ded0144e4c 8?q=high-ascii+character &rnum=1&hl=en#9 d5f6ded0144e4c8 >

An an excellent piece on HTML character encoding here:

<URL:http://ppewww.ph.gla.a c.uk/~flavell/charset/checklist>
[...]
--
Rob
Sep 18 '05 #5

"RobG" <rg***@iinet.ne t.au> wrote in message
news:1m******** *********@news. optus.net.au...
bgbauer70 wrote:
Hi Rob,

Is there a way to regex test based on ascii #? The problem is I just
want to filter out high ascii ( >127 ).


There is no such thing as "high ascii" - it stops at 127, there are no
ASCII characters beyond it.


This is just not true. The extended ASCII character set has 255.
Sep 19 '05 #6
ASM
bgbauer70 wrote:
"RobG" <rg***@iinet.ne t.au> wrote in message
news:1m******** *********@news. optus.net.au...
bgbauer70 wrote:
Hi Rob,

Is there a way to regex test based on ascii #? The problem is I just
want to filter out high ascii ( >127 ).


There is no such thing as "high ascii" - it stops at 127, there are no
ASCII characters beyond it.

This is just not true. The extended ASCII character set has 255.


here(*) :
http://www.miakinen.net/vrac/c08/charsets
I see ASCII with 126 carateres
and (extended ASCII ?) charset : CP437
with 255 caracteres

(*) use alternative css 'Tableaux en pixels'
--
Stephane Moriaux et son [moins] vieux Mac
Sep 19 '05 #7
To filter out, you could perhaps filter out from >126 as 127 is unused.

The reg exp woud be:-

var r=/[\x7F-\xFF]*/g;
s=s.replace(r," ");

Sep 19 '05 #8
Baconbutty wrote:
To filter out, you could perhaps filter out from >126 as 127 is unused.

The reg exp woud be:-

var r=/[\x7F-\xFF]*/g;
s=s.replace(r," ");

Good, but this replaces control characters too (\x0 - \x1f )
Mick
Sep 19 '05 #9
bgbauer70 wrote:
"RobG" <rg***@iinet.ne t.au> wrote in message
news:1m******** *********@news. optus.net.au...
bgbauer70 wrote:
Hi Rob,

Is there a way to regex test based on ascii #? The problem is I just
want to filter out high ascii ( >127 ).

There is no such thing as "high ascii" - it stops at 127, there are no
ASCII characters beyond it.

This is just not true. The extended ASCII character set has 255.


There are a vast array of extended ASCII sets, IBM alone developed over
three hundred of them[1], but none of them are standards. The following
reference seems a pretty good history:

<URL: http://en.wikipedia.org/wiki/ASCII >

ASCII consists of 128 characters mapped to a decimal range of 0 to 127
inclusive. Because it's been around for over 40 years, it's been
bastardised many times but:

"...most widely-used form uses the ANSI X3.4-1986 definition, also
standardized as ECMA-6, ISO/IEC 646:1991 International Reference
Version, ITU-T Recommendation T.50 (09/92), and Request for Comments
RFC 20."

In other words, the ASCII 7 bit character set has been standardised by a
number of official international standards-setting organisations[2].

I'm happy to be proven wrong, but you'll need to find a reference to an
official standard for 'the extended ASCII character set' to do it.
1.
<URL:
http://www-03.ibm.com/servers/eserve...codepages.html


2.
Standard ECMA-6:
<URL:
http://www.ecma-international.org/pu...T/Ecma-006.pdf >

--
Rob
Sep 19 '05 #10

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