Ajax 코딩 절차

* Ajax 코딩 절차

① XMLHttpRequest 생성

② HttpProtocol 구성

③ Callback Function 지정

④ Request.send(data/null)

⑤ Callback Function 구현

* 예제

var request = null;
        
function createRequest(){
    try{
        request = new XMLHttpRequest();
    }catch(trymicrosoft){
        try{
            request = new ActiveXObject("Msxml2.XMLHTTP");
        }catch(othermicrosoft){
            try{
                request =new ActiveXObject("Microsoft.XMLHTTP");
            }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.onreadystatechange = updatePage;
    
    request.send(null);
}