利用ASP + XML 架设在线考试系统
<-------------此程序非本人原创-------->
使用这个在线的考试系统，我们能处理任何类型在线测试。 尽管我们一般是用传统方式实现，读者非常希望将。
如果从总体上考虑。 所有问题都储存在服务器( 它可能在数据库里) 里面的的xml 文件里。 用户准备花费考试，然后用户测试的通体将通过微软的XML HTTP 组件传送到浏览器。 使用同一个XML HTTP 组件，每当用户请求一个问题的时候，那些问题内容被从服务器解释并且显示在页上。 对用户的任何问题，你所选择的答案会被储存在客户端。
一次考试的持续时间是5 分钟。 没有回答不了，你可以使用NEXT回答下洋问题。 一旦用户启动考试，所有问题目录将来自服务器。 所给问题的Id 每请求到服务器以来在内目录在客户拿给并且给服务器派内储存。 服务器将返回问题内容，符合问题Id，从xml 文件。 当用户选择任何一个答案时，体制将在那些应答表里储存和在在客户边里的选择表里。 用户最后已经选择的正确的答案，应答表用来并不地检查。 选择表在那里是以便系统将自动选择用户已经选择了的选择 ( 例如用户点击以前的按钮) 考试将结束或者用户点击终结按钮或者首先来，时间( 例如5 分钟) 结束。 关于终结，系统将计算并不右边答案的并且展示它。 那些以下的文件被在在线的考试系统里使用：
OLExam.html
<html>
<script>
var objXmlHTTP,objXmlDOM;
var aQuest; //to store question ids
var aAnswer = new Array(); // to track the result
var aSelected = new Array(); // to store user's response
var count = 0; //to store the current question no
var ansSel = 0; //to store user's selection
var ExamDuration = 5 * 60 ; // 5 minutes
var timerID; //to store the setInterval fun's id
var radIndex = -1; //to store the selected radio's index
//constructor like function
//here XML objects are created and
//No of questions as well as question ids list
//are fetched from the server.
function init(){
objXmlHTTP = new ActiveXObject("Microsoft.XMLHTTP");
objXmlDOM = new ActiveXObject("Microsoft.XMLDOM");
objXmlHTTP.open("POST","OLExam.asp?Action=Start",false);
objXmlHTTP.send("");
temp =objXmlHTTP.ResponseText;
aQuest = temp.split(",");
//initialize the user's answers list
for(i=0;i<aQuest.length; i++){
aAnswer[i] = 0; // 0 for wrong; 1 for right answer
aSelected[i] = -1; // to store the radio's index
}
if(count < aQuest.length) {
url = "OLExam.asp?Action=NextQ&QNo=" + aQuest[count];
objXmlHTTP.open("POST", url ,false);
objXmlHTTP.send("");
objXmlDOM.loadXML(objXmlHTTP.ResponseText);
//parse the response content fetched from the server
//and display the question
parseQ();
}
//change the Start button's caption and its click event
document.frm.btnFinish.value = "Finish the Exam";
document.frm.btnFinish.onclick = showResult; //function
//start the timer
timerID = setInterval("timer()",1000);
}
function getPreQ() {
//update the user's answers list
checkAnswer();
//decrement the question no - i.e. to previous Question
count--;
//stop the timer
clearInterval(timerID);
//fetch the question for the aQuest[count] id
url = "OLExam.asp?Action=NextQ&QNo=" + aQuest[count];
objXmlHTTP.open("POST",url ,false);
objXmlHTTP.send("");
objXmlDOM.loadXML(objXmlHTTP.ResponseText);
//parse the response content fetched from the server
//and display the question
parseQ();
//start the timer
timerID = setInterval("timer()",1000);
}
function getNextQ() {
//update the user's answers list
checkAnswer();
//increment the question no - i.e. to next Question
count++;
//stop the timer
clearInterval(timerID);
url = "OLExam.asp?Action=NextQ&QNo=" + aQuest[count];
objXmlHTTP.open("POST", url ,false);
objXmlHTTP.send("");
objXmlDOM.loadXML(objXmlHTTP.ResponseText);
//parse the response content fetched from the server
//and display the question
parseQ();
//start the timer
timerID = setInterval("timer()",1000);
}
function parseQ(){
//fetch the question from theXML Object
//format the display
strOut = "<table border=0 align=center width=80%>";
strOut += "<tr><td colspan=2><b>";
strOut += "Question No: " + (count+1) + " of ";
strOut += aQuest.length + "</b></td></tr>";
strOut += "<tr><td colspan=2> </td></tr>";
temp = objXmlDOM.selectSingleNode("data/qtext").text;
strOut += "<tr><td colspan=2><b>"+temp+"</b></td></tr>";
strOut += "<tr><td colspan=2> </td></tr>";
Nodes = objXmlDOM.selectNodes("data/choice");
for(i=0;i<Nodes.length;i++){
strOut += "<tr><td align=center width=10%>";
strOut += "<input type=radio name=ansUsr ";
strOut += " onClick='ansSel=" + (i+1);
strOut += ";radIndex=" + i + "' ";
strOut += "value=" + (i+1) + "></td><td>";
strOut += Nodes.item(i).text + "</td></tr>";
}
//set ansNo (hidden field) to the actual answer
temp = objXmlDOM.selectSingleNode("data/answer").text;
document.frm.ansNo.value = temp;
strOut += "<tr><td colspan=2> </td></tr>";
strOut += "<tr><td colspan=2>";
if(count != 0 ){
strOut += "<input type=button value=Previous ";
strOut += " onClick='getPreQ()'> ";
}
if(count < aQuest.length-1){
strOut += " <input type=button value=Next";
strOut += " onClick='getNextQ()'>";
}
strOut += "</td></tr></table>";
//set the strOut content to <P> tag named QArea
QArea.innerHTML = strOut;
//set the default value to ansSel
ansSel = 0;
radIndex = -1;
//check the radio if user has selected previously
if (aSelected[count] != -1) {
radIndex = aSelected[count];
ansSel = radIndex + 1;
document.frm.ansUsr[radIndex].checked = true;
}
}
function checkAnswer(){
//store the selected radio's index
aSelected[count] = radIndex;
//if the user selection matches the actual answer
if (ansSel == document.frm.ansNo.value)
aAnswer[count] = 1;
else
aAnswer[count] = 0;
}
function showResult() {
rights = 0;
//stop the timer
clearInterval(timerID);
//update the user's answers list
checkAnswer();
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