一个Ajax实例（成本项目）
前端代码：
<script type="text/javascript" language="javascript">
function getHttpRequestObject()//创建xmlhttprequest对象
{
var xmlhttp;//定义变量，用来创建xmlhttprequest对象
if (!xmlhttp && typeof XMLHttpRequest != 'undefined')// 创建xmlhttprequest,ajax开始
{
try
{
xmlhttp = new XMLHttpRequest();//非IE浏览器，用xmlhttprequest对象创建
}
catch (e)
{
xmlhttp = false;
}
}
else
{
try
{
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");//IE浏览器用activexobject对象创建
}
catch (e)
{
try {
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");//IE浏览器用activexobject对象创建
}
catch(e)
{
xmlhttp = false;
}
}
}
return xmlhttp;
}
function setMenuVisible(isVisible)//菜单是否显示
{
if(isVisible == true)
{
document.getElementById("divmenu").style.display = "inline";//显示菜单
var obj=document.getElementById("txtGroupName");//获取菜单要显示的地方（HTML元素）
var left=obj.offsetLeft;//获得obj控件距离左边或上层控件的位置
var top=obj.offsetTop;//获得obj控件距离上边或上层控件的位置
while(obj!=document.body)//循环获得obj控件在页面的绝对位置
{
left +=obj.offsetLeft;
top +=obj.offsetTop;
obj=obj.offsetParent ;
}
document.getElementById("divmenu").style.top=document.getElementById("txtGroupName").offsetHeight +top+document.body.offsetTop;
document.getElementById("divmenu").style.left=left+document.body.offsetLeft;
}
else
{
document.getElementById("divmenu").style.display = "none";
}
}
var req;
function onComplete()
{
var strGroupName=document.getElementById("txtGroupName").value.replace(/^\s+|\s+$/g,"");
if(strGroupName!="")
{
var url;
url ="CreaditUserAdd.aspx"+"?action=query&groupName="+escape(strGroupName);
req = getHttpRequestObject();//获得XmlHttpRequset对象
req.onreadystatechange = processRequest;//请求状态发生变化，回调函数
req.open("GET",url,true);
req.send(null);//发送请求
}
}
function fillSuggest(name)
{
document.getElementById("txtGroupName").value = name;
setMenuVisible(false);
GroupChange(name);
}
function processRequest()//回调函数
{
if(req.readyState == 4)//接收成功
{
setMenuVisible(false);
if(req.status == 200)
{
var names = req.responseXML.getElementsByTagName("Names")[0].selectNodes("Name");
clearMenu();
if(names.length > 0)
{
var newDivHtml = "";
for(var i=0;i<names.length;i++)
{
newDivHtml += "<div style=\"width:150px; align:center; background-color:White; border-right: #cccccc 1px solid;z-index:2; border-left: #cccccc 1px solid;display:\"inline\";\" onMouseOver=\"this.style.background ='#ddefff'\" onMouseOut=\"this.style.background ='#FFFFFF'\" onclick=\"fillSuggest('"+names[i].text+"')\">"+names[i].text+"</div>";
}
document.getElementById("divmenu").innerHTML = newDivHtml;
setMenuVisible(true);
}
}
else
{
clearMenu();
}
}
}
function clearMenu()
{
document.getElementById("divmenu").innerHTML = " ";
//position:absolute;
}
function GroupChange(name)
{
var strGroupName;
if(name==null)
strGroupName=document.getElementById("txtGroupName").value.replace(/^\s+|\s+$/g,"");
else
strGroupName=name;
if(strGroupName!="")
{
var url;
url ="CreaditUserAdd.aspx"+"?action=getSize&groupName="+escape(strGroupName);
req = getHttpRequestObject();
req.onreadystatechange = setGroupSize;
req.open("GET",url,true);
req.send(null);
}
}
///设置集团规模
function setGroupSize()
{
if(req.readyState == 4&&req.status == 200&&req.statusText == "OK")
{
if(req.responseText!="")
{
document.getElementById("txtGroupSize").value=req.responseText;
}
}
}
//信用类型改变
function dplType_change()
{
if(document.getElementById("dplType").value=="1006000003")
{
document.getElementById("trGroup").style.display="inline";
document.getElementById("rfvGroupName").enabled=true;
}
else
{
document.getElementById("trGroup").style.display="none";
document.getElementById("rfvGroupName").enabled=false;
}
}
</script>
<input type="text" style="width: 150px;" runat="server" id="txtGroupName" onchange="GroupChange()"
onkeyup="onComplete()" />
<asp:DropDownList ID="ddlSalePan" runat="server" Width="150px"></asp:DropDownList>
后端代码：
#region 模糊查询集团
if (null != Request.QueryString["groupName"] && Request["action"] == "query")
{
Response.ContentType = "text/xml";
Response.AppendHeader("Cache-Control", "no-cache");
Response.Write(GetSuggestInfo(Request.QueryString["groupName"].Trim()));
Response.End();
}
#endregion
#region 获得集团规模
if (null != Request.QueryString["groupName"] && Request["action"] == "getSize")
{
Response.Clear();
Response.Write(CM_CREDIT_USER.getGroupSize(Request["groupName"]));
Response.End();
}
#endregion
#region 保持客户端控件的属性
if (dplType.SelectedValue == "1006000003")
{
if (txtGroupName.Name.Trim() != "")
{
txtGroupSize.Attributes["value"] = CM_CREDIT_USER.getGroupSize(txtGroupName.Value.Trim());
}
trGroup.Style["display"] = "inline";
rfvGroupName.Enabled = true;
}
else
{
trGroup.Style["display"] = "none";
rfvGroupName.Enabled = false;
}
#endregion
Business层：
#region GetSuggestInfo
public string GetSuggestInfo(string strname)
{
XmlDocument doc = new XmlDocument();
XmlNode rootnode = doc.CreateNode(XmlNodeType.Element, "Names", "");
doc.AppendChild(rootnode);
DataSet ds = QueryGroupFromBbossByName(strname);
if (ds != null && ds.Tables[0].Rows.Count<1000)
{
foreach (DataRow objRow in ds.Tables[0].Rows)
{
XmlNode subnode = doc.CreateNode(XmlNodeType.Element, "Name", "");
subnode.InnerText = objRow["customer_name"].ToString();
doc.ChildNodes[0].AppendChild(subnode);
}
}
return doc.InnerXml;
}
#endregion
#region getGroupSize
/// <summary>
/// 根据集团名称获得集团规模
/// </summary>
/// <param name="strGroupName">集团名称</param>
/// <returns>集团规模</returns>
public static string getGroupSize(string strGroupName)
{
string strReturn = "";
DataSet ds = new CM_GROUP_COST().GetGroupInfoFromBboss(strGroupName);
if (ds != null && ds.Tables[0].Rows.Count != 0)
{
if (ds.Tables[0].Rows[0]["CUSTOMER_SIZE"] == DBNull.Value)
return "";
int nGroupSize = Convert.ToInt32(ds.Tables[0].Rows[0]["CUSTOMER_SIZE"]);
switch (nGroupSize)
{
case 1:
strReturn = "A 类";
break;
case 2:
strReturn = "B 类";
break;
case 3:
case 4:
strReturn = "C 类";
break;
default:
strReturn = "";
break;
}
}
return strReturn;
}
#endregion
