請求jsp與請求普通文件不通過的地方,請求jsp可能會傳參,比如搜索,用戶名,頁碼這些
html部分:<input type="text" id="txt1" onkeyup="showHint(this.value)" /> 實參:this.value,input中的值
js部分:function showHint(str){.....} str用于接收實參
xmlhttp.open("GET","/ajax/gethint.asp?q="+str,true); asp中的變量q 接收請求asp文件傳送的值:this.vue
此處為后端服務(wù)器腳本,簡單能看懂即可:
<%
response.expires=-1
dim a(30)
'用名字來填充數(shù)組
a(1)="Anna"
a(2)="Brittany"
a(3)="Cinderella"
a(4)="Diana"
a(5)="Eva"
a(6)="Fiona"
a(7)="Gunda"
a(8)="Hege"
a(9)="Inga"
a(10)="Johanna"
a(11)="Kitty"
a(12)="Linda"
a(13)="Nina"
a(14)="Ophelia"
a(15)="Petunia"
a(16)="Amanda"
a(17)="Raquel"
a(18)="Cindy"
a(19)="Doris"
a(20)="Eve"
a(21)="Evita"
a(22)="Sunniva"
a(23)="Tove"
a(24)="Unni"
a(25)="Violet"
a(26)="Liza"
a(27)="Elizabeth"
a(28)="Ellen"
a(29)="Wenche"
a(30)="Vicky"
'獲得來自 URL 的 q 參數(shù)
q=ucase(request.querystring("q"))
'如果 q 大于 0，則查找數(shù)組中的所有提示
if len(q)>0 then
hint=""
for i=1 to 30
if q=ucase(mid(a(i),1,len(q))) then
if hint="" then
hint=a(i)
else
hint=hint & " , " & a(i)
end if
end if
next
end if
'如果未找到提示，則輸出 "no suggestion"
'否則輸出正確的值
if hint="" then
response.write("no suggestion")
else
response.write(hint)
end if
%>
***************this over**************8
AJAX和數(shù)據(jù)庫的動態(tài)通信: 主要是由后端來完成,設(shè)置一個接收參數(shù)又前端傳入
dom編寫同上
ajax服務(wù)器頁面編寫如下:
<% response.expires=-1 sql="SELECT * FROM CUSTOMERS WHERE CUSTOMERID=" sql=sql & "'" & request.querystring("q") & "'" set conn=Server.CreateObject("ADODB.Connection") conn.Provider="Microsoft.Jet.OLEDB.4.0" conn.Open(Server.Mappath("/db/northwind.mdb")) set rs=Server.CreateObject("ADODB.recordset") rs.Open sql,conn response.write("<table>") do until rs.EOF for each x in rs.Fields response.write("<tr><td><b>" & x.name & "</b></td>") response.write("<td>" & x.value & "</td></tr>") next rs.MoveNext loop response.write("</table>") %>
AJAX被用來與XML的交互式通信
當(dāng)服務(wù)器響應(yīng)就緒時，會構(gòu)建一個 HTML 表格，從 XML 文件中提取節(jié)點（元素），最后使用已經(jīng)填充了 XML 數(shù)據(jù)的 HTML 表格來更新 txtCDInfo 占位符：
<html>
<head>
<script type="text/javascript">
function loadXMLDoc(url)
{
var xmlhttp;
var txt,x,xx,i;
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onreadystatechange=function()
{
if (xmlhttp.readyState==4 && xmlhttp.status==200)
{
txt="<table border='1'><tr><th>Title</th><th>Artist</th></tr>";
x=xmlhttp.responseXML.documentElement.getElementsByTagName("CD");
for (i=0;i<x.length;i++)
{
txt=txt + "<tr>";
xx=x[i].getElementsByTagName("TITLE");
{
try
{
txt=txt + "<td>" + xx[0].firstChild.nodeValue + "</td>";
}
catch (er)
{
txt=txt + "<td> </td>";
}
}
xx=x[i].getElementsByTagName("ARTIST");
{
try
{
txt=txt + "<td>" + xx[0].firstChild.nodeValue + "</td>";
}
catch (er)
{
txt=txt + "<td> </td>";
}
}
txt=txt + "</tr>";
}
txt=txt + "</table>";
document.getElementById('txtCDInfo').innerHTML=txt;
}
}
xmlhttp.open("GET",url,true);
xmlhttp.send();
}
</script>
</head>
<body>
<div id="txtCDInfo">
<button onclick="loadXMLDoc('/example/xmle/cd_catalog.xml')">獲得 CD 信息</button>
</div>
</body>
</html>
![]()
over:xml文件
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