ASCII码值控制键盘只能输入某些字符或符号

通过判断ASCII值可限制一些字符和符号的输入，比如只能输入数字和“.”:

<asp:TextBox ID="TxtGuaranteeEndDate2" runat="server" Width="141px"
onkeypress="onlyNumericAndDot()" Style="ime-mode: disabled"></asp:TextBox>

js代码

   
     

    
      
    
       1 
    
      //
    
      验证只能为数字和.
    
      

    
       2 
    
      
    
      function
    
       onlyNumericAndDot()

    
       3 
    
       {

    
       4 
    
       
    
      if
    
      (window.event.keyCode 
    
      !=
    
       
    
      46
    
      )

    
       5 
    
       {

    
       6 
    
       
    
      if
    
       ( 
    
      !
    
      (((window.event.keyCode 
    
      >=
    
       
    
      48
    
      ) 
    
      &&
    
       (window.event.keyCode 
    
      <=
    
       
    
      57
    
      )) 
    
      ||
    
       (window.event.keyCode 
    
      ==
    
       
    
      13
    
      ) 
    
      ||
    
       (window.event.keyCode 
    
      ==
    
       
    
      46
    
      )))

    
       7 
    
       {

    
       8 
    
       window.event.keyCode 
    
      =
    
       
    
      0
    
       ;

    
       9 
    
       }

    
      10 
    
       }

    
      11 
    
       }
   
     

并且要补上Style="ime-mode: disabled"，此属性是屏蔽输入法切换