Javascript problem with keyCodes for Delete and '.'

Hi all,
I have a javascript to limit the text entry in a text area after the size reaches 300
(only thing that should be allowed is left arrow,up arrow, right arrow 39,down arrow,delete and backspace ) when i wrote the following script it works fine in firefox but in IE there is a problem. The problem comes in IE from the fact that the keyboard code and the character code overlap each other, and the character code for the period character is 46. It just so happens that the keyboard code for the delete key is also 46. so it allows period which has to be prevented! any help will be appreciated.

And thanks in advance

function stopTyping(field, event, size)
{
var txt = field.value;
var re = /\r\n/g
txt = txt.replace(re, "\n");
if(txt.length >= size)
{
/*
left arrow 37
up arrow 38
right arrow 39
down arrow 40
delete 46
backspace 8
*/
// check for the shift key as well
// This is required as in IE SHIFT+% will return a code of 37...
if(event.shiftKey)
{
return false;
}
else
{
if (event.keyCode != 8 && event.keyCode != 46
&& event.keyCode != 38 && event.keyCode != 39
&& event.keyCode != 40 && event.keyCode != 37)
{
return false;
}
}
}
}

Aug 10 '07 #1

Subscribe Post Reply

11702

epots9

1,351

Expert 1GB

using

Expand|Select|Wrap|Line Numbers

<body onkeydown="alert(event.keyCode);" >

in ie7 and firefox 2.0.0.6 i got:

Expand|Select|Wrap|Line Numbers

 
. -> 190

delete -> 46

del -> 110

Aug 10 '07 #2

gouthambu

using

Expand|Select|Wrap|Line Numbers

<body onkeydown="alert(event.keyCode);" >

in ie7 and firefox 2.0.0.6 i got:

Expand|Select|Wrap|Line Numbers

. -> 190

delete -> 46

del -> 110

Just curious to know is "onKeyPress" that i'm using creating problems with the key code

Thanks in advance,
Goutham

Aug 13 '07 #3

xNephilimx

213

Expert 100+

There's a difference between Firefox and IE when retriving character codes.
In IE, to get the character code with the onkeypress handler you use keyCode, but in Firefox you should use charCode to get it.

Read this http://www.quirksmode.org/js/keys.html#link1
Read the whole article too, it's very useful

May be your problem has something to do with this

Kind regards,
The_Nephilim

Just curious to know is "onKeyPress" that i'm using creating problems with the key code

Thanks in advance,
Goutham

Aug 13 '07 #4

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