I currently practicing HTML/CSS/DOM(JS) and more focusing on DOM right now. For now, I try to clone the instagram for studying HTML/CSS/DOM. In the DOM part(js), when I try to use event(EventListener), I am curious that "If the other project or Website need so many EventListener,Do I have to declare name.addEventListener("event name", function()) every-time? Can I declare the EventListener at the body or wrapper(div-class) and using event.target, so I don't need to be declared EventListener several times?" I am sorry if I explain so weird and messy. I tried to explain my brain storming thought. I will share my code just in case
This is HTML
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>
Westagram!
</title>
<link rel="stylesheet" href="style/login.css" type="text/css">
<link rel="stylesheet" href="style/common.css" type="text/css">
<!-- <link rel="stylesheet" href="js/login.js"> -->
</head>
<body>
<!-- 아래 모든 div들을 포함하는 제일 상위 Container -->
<div class="wrapper">
<div class="logo">
<p class="westagram">Westagram</p>
</div>
<!-- 로그인 섹션 -->
<div class="login-container">
<div class="id">
<input type="text" id="text" placeholder="Phone number, username, or email" />
</div>
<div class="pw">
<input type="password" id="password" placeholder="Password">
</div>
<div class="bt">
<button class="login-btn">Log in
</button>
</div>
</div>
<!-- 비밀번호 찾는 섹션 -->
<div class="click">
<a class="find-password">Forgot Password</a>
</div>
</div>
<script src="js/login.js"></script>
</html>
This is CSS file
*{
padding: 0;
margin: 0;
text-decoration: none;
list-style: none;
box-sizing: border-box;
}
@font-face {
font-family: instagramFont;
src: url("../src/westagram.ttf") format("opentype");
}
.wrapper {
margin: 250px 250px 0px 250px;
padding: 30px;
display: flex;
flex-direction: column;
justify-content: space-between;
align-items: center;
border: solid 1px #D3D3D3;
width: 500px;
height: 500px;
}
.wrapper .login-container {
width: 400px;
height: 500px;
}
.wrapper .login-container .id{
margin-top: 70px;
}
#text {
width: 100%;
height: 45px;
border: solid 1px #D3D3D3;
border-radius: 5px;
padding-left: 15px;
}
#password {
width: 100%;
height: 45px;
border: solid 1px #D3D3D3;
border-radius: 5px;
padding-left: 15px;
}
.wrapper .login-container .bt .login-btn{
width: 100%;
height: 45px;
border: solid 1px #D3D3D3;
border-radius: 5px;
/*background-color: #ff000;*/
background-color: #B2DFFC;
cursor: pointer;
/*padding-left: 15px;*/
}
.wrapper .login-container .pw {
margin-top: 10px;
margin-bottom: 10px;
}
.wrapper .login-container.bt {
}
.westagram {
font-size : 60%;
font-family: instagramFont;
font-size: 5rem;
}
This is JS code
let id = document.querySelector("#text");
let password = document.querySelector("#password");
let loginButton = document.querySelector(".login-btn")
function active() {
if(id.value.length > 0 && password.value.length > 0){
loginButton.style.backgroundColor='#0095F6';
} else {
loginButton.style.backgroundColor='#B2DFFC'
}
}
id.addEventListener("keyup", active)
password.addEventListener("keyup", active)
I really appreciate your help in advance!