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AJAX技术中的 ajax 不错的应用

出处:互联网 整理: 软晨网（RuanChen.com） 发布: 2009-09-13 浏览: 48 ::

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开始研究Ajax. 第一天 Ajax技术(WEB无刷新提交数据)-

var http_request = false;

function makeRequest(url) {

http_request = false;

if (window.XMLHttpRequest) { // Mozilla, Safari,...
http_request = new XMLHttpRequest();
if (http_request.overrideMimeType) {
http_request.overrideMimeType('text/xml');
}
} else if (window.ActiveXObject) { // IE
try {
http_request = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try {
http_request = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e) {}
}
}

if (!http_request) {
alert('Giving up :( Cannot create an XMLHTTP instance');
return false;
}
http_request.onreadystatechange = alertContents;
http_request.open('GET', url, true);
http_request.send(null);

}

function alertContents() {

if (http_request.readyState == 4) {
if (http_request.status == 200) {
alert(http_request.responseText);
} else {
alert('There was a problem with the request.');
}
}

}
</script>
<span
style="cursor: pointer; text-decoration: underline"
onclick="makeRequest('test.html')">
Make a request
</span>

点击运行可以看到效果:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <script type="text/javascript" language="javascript"> var http_request = false; function makeRequest(url) { http_request = false; if (window.XMLHttpRequest) { // Mozilla, Safari,... http_request = new XMLHttpRequest(); if (http_request.overrideMimeType) { http_request.overrideMimeType('text/xml'); } } else if (window.ActiveXObject) { // IE try { http_request = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { try { http_request = new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {} } } if (!http_request) { alert('Giving up :( Cannot create an XMLHTTP instance'); return false; } http_request.onreadystatechange = alertContents; http_request.open('GET', url, true); http_request.send(null); } function alertContents() { if (http_request.readyState == 4) { if (http_request.status == 200) { var xmldoc = http_request.responseXML; var root_node = xmldoc.getElementsByTagName('root').item(0); alert(root_node.firstChild.data); } else { alert('There was a problem with the request.'); } } } </script> </head> <body> <span style="cursor: pointer; text-decoration: underline" onclick="makeRequest('test.xml')"> Make a request </span> </body>
</html>

[Ctrl+A 全选提示:你可先修改部分代码,再按运行]

开始研究Ajax. 第一天 Ajax技术(WEB无刷新提交数据)-

AJAX技术 中的 ajax 不错的应用

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AJAX技术中的 ajax 不错的应用