[javascript] Ajax 기본

function getHTTPObject(){
 var xmlhttp;
 if (window.XMLHttpRequest){
  xmlhttp = new XMLHttpRequest();
 }else if (window.ActiveXObject){
  xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
 }
 return xmlhttp;
}

var http = getHTTPObject();
var team_auth_Flag = "false";

 

function chk_team(){
 target_name = document.form1.vc_team_name;
  team_auth_Flag = "false";
  http.open("GET", "chk_team.php?vc_team_name="+target_name.value, true); 
  http.onreadystatechange = team_authResponse;
  http.send(null);
}

function team_authResponse(){
 if (http.readyState == 4){
  if (http.status == 200){
   team_auth_Flag = http.responseXML.getElementsByTagName("result")[0].childNodes[0].nodeValue;
   if(team_auth_Flag=="true"){
    alert("true");
   }else{
    alert("false");
   }
  }else{
   alert("error");
  }
 }
}