<html>
<head>
<script>
/* Author: Kevin
* Date: 2011-10-21
* Description:
* 1. 'num': Only allow to input number 0-9;
* 2. 'alp': Only allow to input alphabet A-Z(a-z);
* 3. 'numalp': Only allow to input both number and alphabet above.
*/
function fnInputCondition(pKind){
var code = event.keyCode;
var invalid = false;
var invalidMsg = "";
pKind = pKind.toUpperCase();
//alert("Kevin test: code = " + code);
if(!fnCheckControl()){
if(pKind == "NUM"){
if(!fnCheckNum()){
invalid = true;
invalidMsg = "只能输入数字!";
}
}else if(pKind == "ALP"){
if(!fnCheckAlphabet()){
invalid = true;
invalidMsg = "只能输入英文字母!";
}
}else if(pKind == "NUMALP"){
if(!(fnCheckNum() || fnCheckAlphabet())){
invalid = true;
invalidMsg = "只能输入数字和英文字母!";
}
}
if(invalid){
event.returnValue = false;
alert(invalidMsg);
}
}
// 检查是否输入控制键
function fnCheckControl(){
// 8对应退格键, 46对应Del键, 37对应向左键， 38对应向上键，39对应向右键， 40对应向下键
// 13对应回车键，20对应大写锁定键, 16对应Shift键, 144对应数码锁定键, 35对应End键，36对应Home键
if((code == 8 || code == 46 || code == 144 || code == 35 || code == 36 ||
code == 37 || code == 38 || code == 39 || code == 40 ||
code == 13 || code == 20 || code == 16)){
return true;
}else{
return false;
}
}
// 检查是否输入数字
function fnCheckNum(){
// 48-57对应键盘0-9， 96-105对应小键盘0-9, 并屏蔽Shift+(0-9)组合键
if (((code>=48 && code<=57) || (code>=96 && code<=105)) && event.shiftKey != true){
return true;
}else{
return false;
}
}
// 检查是否输入字母
function fnCheckAlphabet(){
// 65-90对应A-Z(a-z), 大小写同一个按键
if ((code>=65 && code<=90)){
return true;;
}else{
return false;
}
}
}
</script>
</head>
<body>
<input type="text" id="t_inputQty" maxlength=200 onkeydown="fnInputCondition('alp');"/>
</body>
</html>