只让输入数字的输入框(javascript)

 javascript小玩意,只让输入数字的输入框<body><script>function JHshNumberText(){if ( !(((window.event.keyCode >= 48) &;amp;&;amp; (window.event.keyCode <= 57)) || (window.event.keyCode == 13) || (window.event.keyCode == 46) || (window.event.keyCode == 45))){window.event.keyCode = 0 ;}} </s cript><form name=frm><input type=text name=test value="" onKeypress="JHshNumberText()"><input type=button name=submit value=submit></form></body>   

 

说明
1 只能输入0到9和小数点
2 只能粘贴数字
3 不能拖动内容进来
4 禁止使用输入法 

 

 

 

<html>
<head>
<meta http-equiv="content-Type" content="text/html;charset=gb2312">
<title>js 只能输入数字和小数点</title>
<script language="JavaScript" type="text/javascript">
 function clearNoNum(obj)
 {
  //先把非数字的都替换掉,除了数字和.
  obj.value = obj.value.replace(/[^\d.]/g,"");
  //必须保证第一个为数字而不是.
  obj.value = obj.value.replace(/^\./g,"");
  //保证只有出现一个.而没有多个.
  obj.value = obj.value.replace(/\.{2,}/g,".");
  //保证.只出现一次,而不能出现两次以上
  obj.value = obj.value.replace(".","$#$").replace(/\./g,"").replace("$#$",".");
 }
 </script>
</head>
<body>
<!--把下面代码加到<body>与</body>之间-->
只能输入数字和小数点的文本框:<input id="input1" onkeyup="clearNoNum(this)">
</body>
</html>

 

 

 

  1. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">  
  2. <html>  
  3.   <head>  
  4.     <title>输入框只能输入数字</title>  
  5.   </head>  
  6.      
  7.   <body>  
  8.     <input type="text" name="num" id="num" onkeypress="return keypress(event)">  
  9.     <script type="text/javascript">  
  10.        function keypress(e){   
  11.         ee = e ? e : window.event ? event : null;   
  12.          var keyNum = event.keyCode;   
  13.          var keyChar = String.fromCharCode(keyNum);   
  14.          var regDig = /\d/g;   
  15.          if(regDig.test(keyChar) || keyChar == ""){   
  16.            return true;   
  17.          }   
  18.          var regDot = /\./g;   
  19.          if (regDot.test(keyChar) && !regDot.test(document.getElementById("num").value)){   
  20.            return true;   
  21.          }   
  22.          return false;   
  23.        }   
  24.     </script>  
  25.   </body>  
  26. </html>  

 

posted @ 2010-05-20 12:07  gllg  阅读(419)  评论(0编辑  收藏  举报