Several basic methods to extend jQuery keyboard events_jquery

/* ================================================== ==============================
Desc: Extended method for keyboard events

Called by:

Auth: Big weather
Date: 2009-10-30
============================ ================================================== ===
Change History
========================================== =========================================
Date: Author: Description:
-------- -------- -------------------

====== ================================================== ========================
Copyright (C) 1992-2009 Hongye Corporation
============ ================================================== ===================

Preliminary knowledge
1. Number 0 key value 48. Number 9 key value 57
2.a Key value 97..z key value 122; A key value 65..Z key value 90
3. Key value 43; - key value 45;. key value 46; backspace 8; tab key value 9;
4.event is global in IE and is a temporary object in Firefox, and parameters need to be passed
*/

jQuery.extend({
/*========= ================================================== ================
Function description: Get the value of the key
Calling method:
jQuery.getKeyNum(event);
*/
getKeyNum:function(e){
var keynum;
if(window.event){ // IE
keynum = event.keyCode;
}
else if(e.which){ // Netscape/Firefox/Opera
keynum = e.which;
}
return keynum;
},
/*============== ================================================== ===========
Function description: Determine whether it is an integer, restrict the edit box to only input numbers
Calling method:

Problems to be solved:
The tab key does not work in Firefox.
*/
isInt:function(e){
var keynum = this.getKeyNum(e);
if(keynum >= 48 && keynum <= 57 || keynum == 8 ){//Backspace under firefox needs to be judged 8
return true;
}
return false;
},
/*============= ================================================== ============
Function description: Determine whether it is a decimal. Limit the edit box to only numbers and one decimal point.
Calling method:

*/
isFloat:function(txt,e) {
var keynum = this.getKeyNum(e);
if(keynum == 46){//Input decimal point
if(txt.value.length == 0){
return false;
}else if(txt.value.indexOf('.') >= 0){
return false;
}else{
return true;
}
}
if(this.isInt(e)){
return true;
}
return false;
}
});