Ajax代码片段

<script type="text/javascript">
                             var xmlhttp;
                             var _result="False";
        function createXMLHttprequest() {
            if (window.ActiveXObject) {
                xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
            }
            else if (window.XMLHttpRequest) {
                xmlhttp = new XMLHttpRequest();
            }
        }
        

        function inData() {
            createXMLHttprequest();
            xmlhttp.open("GET", "http://www.cnblogs.com/AJAX/CheckEmpID.ashx?val=" + $("#<% =txtCode.ClientID%>).val(), true);
            xmlhttp.onreadystatechange = getData;
            xmlhttp.send(null);
          
        }

        function getData() {
            if (xmlhttp.readyState == 4) {
                if (xmlhttp.status == 200) {
                    var result = xmlhttp.responseText;
                    if (result == "True") {
                         $("#errMsg").html("");
                        _result = true;
                    }
                    else {
                        $("#errMsg").html("该员工号不存在，请认真填写员工号！");
                        $("#errMsg").css("color", "red");
                        _result = false;               
                    }
                }
            }

        }
        function CheckEmpCode() {
        return _result;
    }
        </script>
-----------------------------------------

 

<table class="table_edit">
 <tr class="traf"><td colspan="2"><asp:Label ID="lblTitle" runat="server" Text="Label"></asp:Label></td></tr>
 <tr>
 <td class="tdal">员工号：</td>
 <td class="tdar">
  <asp:TextBox id="txtCode" runat="server" CssClass="inpStr"></asp:TextBox> <div id="errMsg" >
                </div>
 </td></tr>
 <tr>
 
 <td class="tdal">个人缴纳养老保险部分：</td>
 <td class="tdar">
  <asp:TextBox id="txtPerEnInsurance" runat="server" CssClass="inpStr"></asp:TextBox>
 </td></tr>
 <tr>
 <td class="tdal">个人缴纳失业保险部分：</td>
 <td class="tdar">
  <asp:TextBox id="txtPerUnInsurance" runat="server" CssClass="inpStr"></asp:TextBox>
 </td></tr>
 
 <td class="tdal">公司缴纳养老保险部分：</td>
 <td class="tdar">
  <asp:TextBox id="txtComEnInsurance" runat="server" CssClass="inpStr"></asp:TextBox>
 </td></tr>
 <tr>
 <td class="tdal">公司缴纳失业保险部分：</td>
 <td class="tdar">
  <asp:TextBox id="txtComUnInsurance" runat="server" CssClass="inpStr"></asp:TextBox>
 </td></tr>
    <tr>
 <td class="tdal">添加人：</td>
 <td class="tdar">
  <asp:TextBox id="txtAddUser" runat="server" CssClass="inpStr"></asp:TextBox>
 </td></tr>
 <tr>
 <td class="tdal">添加时间：</td>
 <td class="tdar">
  <asp:TextBox id="txtAddTime" runat="server" ReadOnly="true"  onfocus="WdatePicker()" CssClass="inpDate"></asp:TextBox>
 </td></tr>
 <tr>
 <td class="tdal">备注：</td>
 <td class="tdar">
  <asp:TextBox id="txtNote" runat="server" CssClass="inpStr"></asp:TextBox>
 </td></tr>
</table>
<div class="div_button">
            <asp:Button ID="btn_ok" runat="server" Text="确定" OnClick="btn_ok_Click"></asp:Button>
        </div>