동기와 비동기의 차이를 request.readyState 메소드를 통하여 확인해보자.
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<!DOCTYPE html>
<html>
<head>
<meta charset="EUC-KR">
<script type="text/javascript">
var request = null;
function createRequest(){
try{
request = new XMLHttpRequest();
//Debug..
//alert ("XMLHttpRequest() 로 request instance생성완료");
}catch(trymicrosoft){
try{
request = new ActiveXObject("Msxml2.XMLHTTP");
//Debug..
//alert ("ActiveXObject(Msxml2.XMLHTTP) 로 request instancet생성완료");
}catch(othermicrosoft){
try{
request =new ActiveXObject("Microsoft.XMLHTTP");
//Debug..
//alert ("new ActiveXObject(Microsoft.XMLHTTP) 로 request instancet생성완료");
}catch(failed){
request = null;
}
}
}
if( request == null ){
alert ("request객체 생성시 error 발생함.");
}
}
function getSold(){
createRequest();
var url = "calcServerAjax.jsp";
request.open("GET",url,true); //비동기
//request.open("GET",url,false); //동기
request.onreadystatechange = updatePage;
console.log("==> 1. request.readyState : "+request.readyState);
request.send(null);
console.log("==> 2. request.readyState : "+request.readyState);
console.log("==> 3. request.readyState : "+request.readyState);
console.log("==> 4. request.readyState : "+request.readyState);
}
function updatePage(){
console.log("====> updatePage() : "+request.readyState);
}
</script>
</head>
<body>
<h1> 판매 보고서</h1>
<table>
<tr>
<th>판매된 상품 갯수</th>
<td><span id="sold">100</span></td>
</tr>
<tr>
<th>상품 단가</th>
<td><span id="price">100</span>원</td>
</tr>
</table>
<h2>총 매출금액 : <span id="cash">100,00원</span></h2>
<form method="POST" action="calcServerNormal.jsp">
<input type="submit" value="판매보고서 다시보기(기존방식)">
</form>
<form>
<input type="button" value="판매보고서 다시보기(ajax적용)" onClick="javascript:getSold()">
</form>
</body>
</html>
|
cs |
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