login.ejs
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<!DOCTYPE html>
<html lang="ko">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Mukho - login form</title>
</head>
<body>
<form action="/register/form" method="post">
<h2>Hello. It's me mukho.</h2>
<a href="http://localhost:3000/main">main</a>
<a href="http://localhost:3000/about">about</a>
<a href="http://localhost:3000/info">info</a><br/>
id : <input type="text" name="ID" required minlength='1' maxlength='20'><br/>
password : <input type="password" name="password" required minlength='1' maxlength='20'><br/> <!-- type password는 입력 값을 *로 표시함-->
</form>
<button class="ajaxsend">Login</button>
<div class="result"></div>
<script>
document.querySelector('.ajaxsend').addEventListener('click', function(){
var ID = document.getElementsByName('ID')[0].value;
var password = document.getElementsByName('password')[0].value;
sendAjax('http://localhost:3000/login', {'ID' : ID, 'password' : password});
})
function sendAjax(url, data){
data = JSON.stringify(data);
var xhr = new XMLHttpRequest();
xhr.open('POST', url);
xhr.setRequestHeader('Content-Type', "application/json"); // 서버로 보낼 때 json type으로 보내겠다.
xhr.send(data);
xhr.addEventListener('load', function(){
var result = JSON.parse(xhr.responseText);
var resultDiv = document.querySelector(".result");
// 웹 반응
if(result.ID){
//resultDiv.innerHTML = "반갑다 "+result.ID;
window.location.href="/main"; // main으로 가라
}
else if(xhr.status === 401) resultDiv.innerHTML = result + "<div class='signup'><a href='/join'>Sign up</a></div>";
else resultDiv.innerHTML = result;
// if(!result.ID) resultDiv.innerHTML = result;
// else if(result.password != password) resultDiv.innerHTML = result;
// else resultDiv.innerHTML = result.ID;
});
};
</script>
</body>
</html>