ASP+AJAX做类似google的搜索提示(2)

function createXmlHttpRequest()
{
var xmlhttp = null;
try
{
xmlhttp = XMLHttpRequest();
}
catch(e1)
{
try
{
xmlhttp = new ActiveXObject("MSXML2.XMLHTTP");
}
catch(e2)
{
try
{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e3)
{
xmlhttp = false;
alert("创建失败!");
}
}
}

return xmlhttp;
}

function change_key()
{
if (xmlHttp.readyState == 4 || xmlHttp.readyState == 0)
{
var str = document.getElementById("txt_key").value;

xmlHttp.open("get","search.asp?key=" + str ,true);
xmlHttp.onreadystatechange = handSearchRequest; 
xmlHttp.send(null);
}
}

function handSearchRequest()
{
if (xmlHttp.readyState == 4)
{
var div = document.getElementById("search_suggest");
div.innerHTML = "";
var str = xmlHttp.responseText.split("|");

for (var i=0; i<str.length; i++)
{
var suggest = ’<div onmouseover="javascript：suggestOver(this);" ’;
suggest += ’onmouseout="javascript：suggestOut(this);" ’;
suggest += ’onclick="javascript：setSearch(this.innerHTML);" ’;
suggest += ’class="suggest_link">’ + str[i] + ’</div>’;
div.innerHTML += suggest;
}
}
}

function setSearch(div_value)
{
document.getElementById("txt_key").value = div_value;
document.getElementById("search_suggest").className = ’none’;
}
function suggestOver(div_value)
{
div_value.className = ’suggest_link_over’;
}