一张html静态网页和一张aspx动态网页就构成了Ajax所需要的两张网页。其中html网页中存放javascript代码和html代码,javascript用于和服务器通信而html则用于构成网页页面;剩下的一张aspx页面就是服务器中响应客户端javascript的。
我做了一个简单的例子:aspx动态页面代码中获取客户端文本框(txt)中内容然后将txt中的文本和服务器端时间反应到客户端。说白了,就是"txt文本"+"服务器端"时间。
html网页
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>Javascript</title>
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<script language="javascript" type="text/javascript">
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var xmlHttp = false;
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if (!xmlHttp && typeof XMLHttpRequest != 'undefined') {
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xmlHttp = new XMLHttpRequest();
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}
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function callServer() {
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var txt = document.getElementsByName("txt").item(0).value;
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var url = "Default2.aspx?txt=" + escape(txt);
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xmlHttp.open("GET", url, true);
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xmlHttp.onreadystatechange = updatePage;
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xmlHttp.send(null);
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}
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function updatePage() {
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if (xmlHttp.readyState == 4) {
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var response = xmlHttp.responseText;
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document.getElementById("div1").innerHTML = response;
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}
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}
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</script>
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</head>
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<body>
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<div id="div1" style="background-color: Yellow">test text.</div>
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<input name="txt" value="hello" />
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<input value="提交" type="button" onclick="callServer()" />
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</body>
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</html>
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Default2.aspx中代码
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<%@ Page Language="C#" %>
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<%
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Response.Write(Request["txt"] +": " + System.DateTime.Now.ToString());
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%>
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每次在浏览器点击”提交“按钮,都会显示服务器端时间,无页面刷新。