google suggest 下拉菜单实现代码(asp.net版本)

1.suggest.js 复制代码保存为suggest.js在你需要的页面引用就行了
//建立跨浏览器的xmlHttp对象引用
var xmlHttp;
var k=-1;
try
{
xmlHttp=new XMLHttpRequest();
}
catch(e)
{
var XMLHTTP_IDS = new Array('MSXML2.XMLHTTP.5.0','MSXML2.XMLHTTP.4.0','MSXML2.XMLHTTP.3.0','MSXML2.XMLHTTP','Microsoft.XMLHTTP' );
var success = false;
for(var i=0;i<XMLHTTP_IDS.length&&!success;i++)
{
try {
xmlHttp = new ActiveXObject(XMLHTTP_IDS[i]);
success = true;
} catch (e) {}
}
if (!success) {
throw new Error('Unable to create XMLHttpRequest.');
}
}
//得到页面使用的引用变量
function initVars() {
inputField = document.getElementById("FrmChangshang");
nameTable = document.getElementById("name_table");
completeDiv = document.getElementById("popup");
nameTableBody = document.getElementById("name_table_body");
document.getElementById("popup").style.display="block";
}
//ajax前台触发函数
function findNames(event) {
var keyc=(window.navigator.appName=="Microsoft Internet Explorer")?event.keyCode:e.which;
if(keyc!=40 && keyc!=38)
{
if (inputField.value.length > 0)
{
var url = "SearchCompany.aspx?cname=" + inputField.value +"&rnd="+Math.random().toString();
xmlHttp.open("GET", url, true);
xmlHttp.onreadystatechange = callback;
xmlHttp.send(null);
}
else
{
clearNames();
}
}
}
//ajax回调函数
function callback()
{
var names;
if (xmlHttp.readyState == 4) {
if (xmlHttp.status == 200)
{
try
{
names=xmlHttp.responseXML.getElementsByTagName("name");
}
catch(e)
{
completeDiv.style.display="none";
clearNames();
}
k=-1;//重新从第一项开始往下选择
setNames(names);
}
else if (xmlHttp.status == 204)
{
clearNames();
}
}
}
//弹出层位置确定函数
function divsOffset()
{
var inputWidth=inputField.offsetWidth;
var inputHeight=inputField.offsetHeight;
var inputTop=inputField.offsetTop;
var inputLeft=inputField.offsetLeft;
nameTable.style.width=