Hướng dẫn tạo form bằng javascript

body {
font-family: Arial, sans-serif;
background-color: #cecece;
}
a {
color: #00bd00;
}
* {
box-sizing: border-box;
}
.register {
width: 500px;
padding: 16px;
margin: 0 auto;
background-color: white;
}
input[type=text], input[type=password] {
width: 100%;
padding: 15px;
margin: 5px 0 22px 0;
display: inline-block;
border: none;
background: #f1f1f1;
}
input[type=text]:focus, input[type=password]:focus {
background-color: #ddd;
outline: none;
}
hr {
border: 1px solid #f1f1f1;
margin-bottom: 25px;
}
.submit {
background-color: #0900bd;
color: white;
padding: 15px 18px;
margin: 8px 0;
border: none;
cursor: pointer;
width: 100%;
opacity: 0.9;
}
.submit:hover {
opacity: 1;
}
.login {
background-color: #ffffff;
text-align: center;
}

function validate[] {
var u = document.getElementById["username"].value;
var p1 = document.getElementById["password"].value;
var p2 = document.getElementById["password-repeat"].value;
 
if[u== ""] {
alert["Vui lòng nhập tên!"];
return false;
}
if[p1 == ""] {
alert["Vui lòng nhập mật khẩu!"];
return false;
}
if[p2 == ""] {
alert["Vui lòng xác minh mật khẩu!"];
return false;
}
 
alert["Xin hãy điền đúng thông tin!"]
 
return true;
}

or use your email for registration Sign Up

See demo: Here

@import url['//fonts.googleapis.com/css?family=Montserrat:400,800'];

* {
    box-sizing: border-box;
}

body {
    background: #f6f5f7;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    font-family: 'Montserrat', sans-serif;
    height: 100vh;
    margin: -20px 0 50px;
}

h2 {
    font-weight: bold;
    margin: 0;
}

h2 {
    text-align: center;
}

p {
    font-size: 14px;
    font-weight: 100;
    line-height: 20px;
    letter-spacing: 0.5px;
    margin: 20px 0 30px;
}

span {
    font-size: 12px;
}

a {
    color: #333;
    font-size: 14px;
    text-decoration: none;
    margin: 15px 0;
}

button {
    border-radius: 20px;
    border: 1px solid #FF4B2B;
    background-color: #FF4B2B;
    color: #FFFFFF;
    font-size: 12px;
    font-weight: bold;
    padding: 12px 45px;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: transform 80ms ease-in;
}

button:active {
    transform: scale[0.95];
}

button:focus {
    outline: none;
}

button.ghost {
    background-color: transparent;
    border-color: #FFFFFF;
}

form {
    background-color: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: 0 50px;
    height: 100%;
    text-align: center;
}

input {
    background-color: #eee;
    border: none;
    padding: 12px 15px;
    margin: 8px 0;
    width: 100%;
}

.container {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 14px 28px rgba[0, 0, 0, 0.25],
        0 10px 10px rgba[0, 0, 0, 0.22];
    position: relative;
    overflow: hidden;
    width: 768px;
    max-width: 100%;
    min-height: 480px;
}

.form-container {
    position: absolute;
    top: 0;
    height: 100%;
    transition: all 0.6s ease-in-out;
}

.sign-in-container {
    left: 0;
    width: 50%;
    z-index: 2;
}

.container.right-panel-active .sign-in-container {
    transform: translateX[100%];
}

.sign-up-container {
    left: 0;
    width: 50%;
    opacity: 0;
    z-index: 1;
}

.container.right-panel-active .sign-up-container {
    transform: translateX[100%];
    opacity: 1;
    z-index: 5;
    animation: show 0.6s;
}

@keyframes show {

    0%,
    49.99% {
        opacity: 0;
        z-index: 1;
    }

    50%,
    100% {
        opacity: 1;
        z-index: 5;
    }
}

.overlay-container {
    position: absolute;
    top: 0;
    left: 50%;
    width: 50%;
    height: 100%;
    overflow: hidden;
    transition: transform 0.6s ease-in-out;
    z-index: 100;
}

.container.right-panel-active .overlay-container {
    transform: translateX[-100%];
}

.overlay {
    background: #FF416C;
    background: -webkit-linear-gradient[to right, #FF4B2B, #FF416C];
    background: linear-gradient[to right, #FF4B2B, #FF416C];
    background-repeat: no-repeat;
    background-size: cover;
    background-position: 0 0;
    color: #FFFFFF;
    position: relative;
    left: -100%;
    height: 100%;
    width: 200%;
    transform: translateX[0];
    transition: transform 0.6s ease-in-out;
}

.container.right-panel-active .overlay {
    transform: translateX[50%];
}

.overlay-panel {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    padding: 0 40px;
    text-align: center;
    top: 0;
    height: 100%;
    width: 50%;
    transform: translateX[0];
    transition: transform 0.6s ease-in-out;
}

.overlay-left {
    transform: translateX[-20%];
}

.container.right-panel-active .overlay-left {
    transform: translateX[0];
}

.overlay-right {
    right: 0;
    transform: translateX[0];
}

.container.right-panel-active .overlay-right {
    transform: translateX[20%];
}

.social-container {
    margin: 20px 0;
}

.social-container a {
    border: 1px solid #DDDDDD;
    border-radius: 50%;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    margin: 0 5px;
    height: 40px;
    width: 40px;
}

footer {
    background-color: #222;
    color: #fff;
    font-size: 14px;
    bottom: 0;
    position: fixed;
    left: 0;
    right: 0;
    text-align: center;
    z-index: 999;
}

footer p {
    margin: 10px 0;
}

footer i {
    color: red;
}

footer a {
    color: #3c97bf;
    text-decoration: none;
}

javascript

    
        const signUpButton = document.getElementById['signUp'];
        const signInButton = document.getElementById['signIn'];
        const container = document.getElementById['container'];

        signUpButton.addEventListener['click', [] => {
            container.classList.add['right-panel-active'];
        }];

        signInButton.addEventListener['click', [] => {
            container.classList.remove['right-panel-active'];
        }];
    

See demo: Here

Kết luận: Dù bạn là một lập trình thiên về cái nào đi chăng nữa thì đây cũng là một ví dụ rất đáng để xem và tham khảo.

• Fanpage: TIPJS [tip javascript]

Ref-Source: Originally published at  www.florin-pop.com.