下拉列表跟文本框同步

  //下拉选择，文本输入框同步

        function ShowReasonInTextBox(ddl, txtId) {

            var nowText = ddl.options[ddl.selectedIndex].text;

            if (nowText != "") {

                document.getElementById(txtId).value = nowText;             

            }s

            else {

                document.getElementById(txtId).value = "";

            }

        }

 

//下拉列表

<asp:DropDownList ID="ddlReason0" runat="server"  style="width:600px;"  AutoPostBack="false" onchange="ShowReasonInTextBox(this,'Reason');">

                 </asp:DropDownList>

                 <asp:DropDownList ID="ddlReason1" runat="server" 

                    style="width:600px;"  AutoPostBack="false" onchange="ShowReasonInTextBox(this,'Reason');">

                 </asp:DropDownList>

                 <asp:DropDownList ID="ddlReason2" runat="server" 

                    style="width:600px;"  AutoPostBack="false" onchange="ShowReasonInTextBox(this,'Reason');">

                 </asp:DropDownList>

//多行文本框

<textarea id="Reason" runat="server" style="width: 600px;" class="input" rows="8"></textarea>