M的部落格

<script language="javascript">

  function checkInput() {

    window.alert(form1.txt_nApply_dt.value.length);

    window.alert(event.keyCode);

    if (((event.keyCode >= 48) && (event.keyCode <= 57)) || ((event.keyCode >= 96) && (event.keyCode <= 105)) || event.keyCode == 8 || event.keyCode == 9 || event.keyCode == 37 || event.keyCode == 39) {

      window.alert('true');

      //return true;

    }

    else {

      window.alert('false');

      //return false;

      event.keyCode = 0;

    }

  }

</script>

<asp:TextBox ID="txt_nApply_dt" runat="server" Width="60px" MaxLength="8" onkeypress="checkInput();"></asp:TextBox>