牛棚

AJAX代码示例

<script type="text/javascript" language="javascript">
    var http_request = false;
    function makeRequest() {
  var url = testform.T1.value;
        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>

<form method="POST" action="" name="testform">
    <p><input type="text" name="T1" size="20">
 <p><input type="button" value="查看" name="B3" onclick="makeRequest()"></p>
</form>

（来源http://woooh.com/post/learn_ajax.html）

posted on 2005-11-09 13:12 阿牛 阅读(125) 评论(0)  编辑 收藏 引用