代码
<script language="javascript" type="text/javascript">
function CallServer(url) {// xml = new ActiveXObject("Microsoft.XMLHTTP");
// var post = "";
// xml.open("POST", url, false);
// xml.setrequestheader("content-length", post.length);
// xml.setrequestheader("content-type", "application/x-www-form-urlencoded");
// xml.send(post);
// var res = unescape(xml.responseText);
// return res
xmlHttp = GetXmlHttpObject();
if (!xmlHttp || xmlHttp == null) {
alert('browser does not support http request')
return;
}
xmlHttp.open("GET", url, false);
xmlHttp.send(null);
var res = unescape(xmlHttp.responseText);
return res
}function CallServerAsy(url, ID)
{
xmlHttp = GetXmlHttpObject();
if (!xmlHttp || xmlHttp == null) {
alert('browser does not support http request')
return;
}//xmlHttp.onreadystatechange = stateChanged;
//xmlHttp.onreadystatechange = stateChanged(ID);
xmlHttp.onreadystatechange = function() { stateChanged(ID) };
xmlHttp.open("GET", url, true);
xmlHttp.send(null);
}
var xmlHttp;
function showHint(str)
{
if (str.length == 0) {
document.getElementById("TextBoxHint").innerHTML = "";
return;
}var url = "LastNameLookup.aspx"
url = url + "?q" + str;
document.getElementById(
"TextBoxHint").innerHTML = "正在处理……";//同步调用代码
<div>
<h1>Lookup</h1>
<b>Last name:</b><asp:TextBox ID="TextBox1" runat="server" onkeyup="showHint(this.value)"></asp:TextBox>
<p><b><i>Names: </i></b> <span id="TextBoxHint"></span></p>
</div>
LastNameLookup.aspx后台：
代码
System.Threading.Thread.Sleep(10000);
string queryLastName = Request.QueryString.Get(0).ToString();
string returnString = "";
returnString = "<select size=1>";
returnString += "<option>111</option>";
returnString += "<option>222</option>";
returnString += "<option>333</option>";
returnString += "<option>444</option>";
returnString += "<option>555</option>";
returnString += "</select>";
Response.Write(returnString);
Response.End();
注意点：open方法指定get还是post，同步还是异步，异步回调方法的指定和参数传递
后台的Response.End(),否则会把所有网页都返回
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