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↑
Forms >>>
Using the OnKeypress event, you can trap and prevent certain characters (repesented by ASCII decimal codes) from being entered in a form field. Just look up the ASCII code for any other characters you wish to block and add it to the script.
Add the below code to the <body> section of your page:
<script
language="javascript"
type="text/javascript">
ie
=
(document.all)
?
1
:
0;
n
=
!ie;
Comment
=
false;
Email
=
false;
PostalCode
=
false;
function
Go(){
document.onkeypress
=
keyDown;
if
(n)
{
document.captureEvents(Event.KEYPRESS);
}
}
function
keyDown(e)
{
var
keycode;
if
(window.event)
keycode =
window.event.keyCode;
else
if
(e)
keycode =
e.which;
else
return
true;
if
(Comment)
{
if
((keycode
>
32
&&
keycode <
48)
||
(keycode
>
57
&&
keycode <
65)
||
(keycode
>
90
&&
keycode <
97))
{
return
false;
}
}
else
if
(Email)
{
if
(keycode==34
||
keycode==39)
{
return
false;
}
}
else
if
(PostalCode)
{
if
(keycode
<
45
||
keycode >
57)
{
return
false;
}
}
}
</script>
<form
onSubmit="return
false;">
<b>This
field will not accept special characters: (like !@#$%^&* etc)<br></b>
<textarea
rows=2
cols=20
name=comments
onKeyPress="Comment
= true; Email = false; PostalCode = false; Go();"></textarea>
<br>
<br>
This field will not accept double or
single quotes:<br>
<input
type=text
name=txtEmail
onKeypress="Comment
= false; Email = true; PostalCode = false; Go();">
<br>
<br>
This field will only accept numbers:<br>
<input
type=text
name=txtPostalCode
onKeypress="Comment
= false; Email = false; PostalCode = true; Go();">
</form>
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