一個簡單的AJAX實現(HELLO AJAX)

來源:互聯網
上載者:User

用戶端部分:

 

<html>

<head>
    <meta http-equiv="Content-Type" content="text/html"/>
    <script language="javascript">
        var ajax;
        function createAjax()
        {
            if(window.ActiveXObject)
            {
                try
                {
                    return new ActiveXObject("Msxm12.XMLHTTP");
                }
                catch(e)
                {
                    try
                    {
                        return new
                                ActiveXObject("Microsoft.XMLHTTP");
                    }
                    catch(e2)
                    {
                        return null;
                    }
                }
            }
            else if(window.XMLHttpRequest)
            {
                return new XMLHttpRequest();
            }
            else
            {
                return null;
            }
        }
        function onRcvData()
        {
            if(ajax.readyState==4)
            {
                if(ajax.status==200)
                {
                    var content=document.getElementById('content');
                    content.innerHTML=ajax.responseText;
                }
                else
                {
                    alert("error");
                }
            }
        }
        function ajaxSendRequest(uri)
        {
            ajax=createAjax();
            if(!ajax)
            {
                alert("no");
                return 0;
            }
            
            ajax.onreadystatechange=onRcvData;
            ajax.open("GET",uri,true);
            ajax.send("");
        }
    </script>
<title>Hello AJAX</title>

</head>

<body>
    <div id="content"></div>
    <br>
    <input type="button" value="Hello" 
        onclick="ajaxSendRequest('http://localhost:8080/test/hello.jsp')">
</body>

</html>

 

伺服器端部分(hello.jsp)

 

<html>
    <head>
        <title>hellp</title>
    </head>
    <body>
       <%
          out.println("HELLO AJAX");
       %>
    </body>
</html>

 

 

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