AJAX基礎-第3章（3）

最後更新：2018-12-04 來源：互聯網

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將響應解析成XML：

伺服器不一定按ＸＭＬ格式發送響應。只要Content-Type的響應首部設定為text/pain（如果是XML，Content-Type的首部為text/xml）。

XML序言: 定義XML的版本和文檔所用字型的編碼

<?xml version="1.0" encoding="UTF-8"?>

說明：GB2312 （簡體中文），UTF-8是世界通用的語言編碼，.UTF8 是(UNICODE八位交換格式）的簡稱，UNICODE是國際標準，也是ISO標準10646的等價標準。中國大陸簡體中文版非常常用的GB2312/GB18030/GBK系列標準是我國的國家標準，但只能對中文和多數西方文字進行編碼。為了網站的通用性起見，用UTF8編碼是更好的選擇。

xmlHttp.status ==0：

xmlHttp.status＝４表示通過伺服器運行，等於０代表在本機上就可以運行，即使沒有通過伺服器（例如tomcat）

例：parseXML.xml:

<?xml version="1.0" encoding="UTF-8"?>
<states>
    <north>
        <state>Minnesota</state>
        <state>Iowa</state>
        <state>North Dakota</state>
    </north>
    <south>
        <state>Texas</state>
        <state>Oklahoma</state>
        <state>Louisiana</state>
    </south>
    <east>
        <state>New York</state>
        <state>North Carolina</state>
        <state>Massachusetts</state>
    </east>
    <west>
        <state>California</state>
        <state>Oregon</state>
        <state>Nevada</state>
    </west>
</states>

parseXML.html:

<!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" contect="text/xml";charset=UTF-8">
<title>Parsing XML Responses with the W3C DOM</title>
<script type="text/javascript">
var xmlHttp;
var requestType = "";

    xmlHttp.open("GET", "parseXML.xml", true);
    xmlHttp.send(null);
}

function handleStateChange() {
    if(xmlHttp.readyState == 4) {
        if(xmlHttp.status == 200||xmlHttp.status ==0) {
            if(requestType == "north") {
                listNorthStates();
            }
            else if(requestType == "all") {
                listAllStates();
            }
        }
    }
}

function listNorthStates() {
    var xmlDoc = xmlHttp.responseXML;
    var northNode = xmlDoc.getElementsByTagName("north")[0];

    var out = "Northern States";
    var northStates = northNode.getElementsByTagName("state");

    outputList("Northern States", northStates);
}

function listAllStates() {
    var xmlDoc = xmlHttp.responseXML;
    var allStates = xmlDoc.getElementsByTagName("state");

    outputList("All States in Document", allStates);
}

function outputList(title, states) {
    var out = title;
    var currentState = null;
    for(var i = 0; i < states.length; i++) {
        currentState = states[i];
        out = out + "/n- " + currentState.childNodes[0].nodeValue;
    }

    alert(out);
}
</script>
</head>

<body>
    <h1>Process XML Document of U.S. States</h1>
    <br/><br/>
    <form action="#">
        <input type="button" value="View All Listed States" onclick="startRequest('all');"/>
        <br/><br/>
        <input type="button" value="View All Listed Northern States" onclick="startRequest('north');"/>
    </form>
</body>
</html>

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