ASP.NET实现License Key输入功能的小例子

 

这个演示，在输入时，是不需要与服务端交互，只有全部输入完毕之后，用户点铵钮才进行验证。因此在这里，写javascript来实现即可。

js:

<script type="text/javascript">
        function jumptonexttextbox(currenttxtbox, nexttextboxid) {
            if (currenttxtbox.value.length >= 5) {
                document.getelementbyid(nexttextboxid).focus();
            }
        }
    </script>

html code:

  license key:
            <asp:textbox id="number1" runat="server" onkeyup="jumptonexttextbox(this, 'number2')" width="65"></asp:textbox>
            -
        <asp:textbox id="number2" runat="server" onkeyup="jumptonexttextbox(this, 'number3')" width="65"></asp:textbox>
            -
        <asp:textbox id="number3" runat="server" onkeyup="jumptonexttextbox(this, 'number4')" width="65"></asp:textbox>
            -
        <asp:textbox id="number4" runat="server" onkeyup="jumptonexttextbox(this, 'number5')" width="65"></asp:textbox>
            -
        <asp:textbox id="number5" runat="server" maxlength ="5" width="65"></asp:textbox>