[原创]利用DropDownlist来控制Textbox输入数字的精度

     

  function  check()
         {
           var  dot = document.all( " dll_Precision_Type " ).value;
          //  alert(dot);
          var  tv = document.all( " txb_Price_Type " ).value;
          if  (isNaN(tv))
         alert( " 此处应为数字类型 " );
          else
          {
            var  t = tv.substring(tv.indexOf( " . " ) + 1 ).length;
            if  (t != dot) { alert( " 你的输入精度不够！ " );  return ;}
          }
         
         }

< body  MS_POSITIONING ="GridLayout" >
         < form  id ="Form1"  method ="post"  runat ="server" >
             < asp:DropDownList  id ="dll_Precision_Type"  style ="Z-INDEX: 101; LEFT: 8px; POSITION: absolute; TOP: 56px"
                runat ="server" >
                 < asp:ListItem  Value ="2" > 2位小数 </ asp:ListItem >
                 < asp:ListItem  Value ="3" > 3位小数 </ asp:ListItem >
             </ asp:DropDownList >
             < asp:textbox  id ="txb_Price_Type"  runat ="server"  CssClass ="edit" ></ asp:textbox >
            
         </ form >
 </body>

  Private   Sub Page_Load() Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        txb_Price_Type.Attributes.Add("onblur", "javascript:check();")
    End Sub