Hey friends, today in this blog you will learn How To Create Login Form Validation Using HTML CSS & JavaScript. In the previous blog, I explained how to create a login registration page using advanced CSS and HTML. and now it’s time to validate the login form using JavaScript.
What is Validation Login Page?
The validation of the HTML form consists in verifying that the identification information entered by the user – E-mail, Username, Password is valid and correct or not. The user will not have access to the reserved page until they enter a valid email and password. And, The shaking effect in this login form means that when the user clicks on the login button without entering the email and password, the input boxes shake to inform the user that these fields are not, they can be empty.
Introduction Of Our Validation Login Page.
In our login validation form in HTML and Js, as you can see in the preview image, there is a login form that contains the login text, two input fields, a connection, etc. . At first, these login errors are not displayed, but when the user clicks the login button without entering the email and password, these errors are displayed with a jerking effect.
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To Create Login Form Validation Using HTML CSS & JavaScript follow these Steps:
To create this program: ( Login Form Validation )
Step 1
Initially you need to create two files one HTML (.html) and another CSS file (.css). After creating these files, just paste the following codes into your VS IDE code sample and create an HTML file called index.html and paste the indicated codes into your HTML file (.html) Remember, you must create a file with the extension. HTML.
<!DOCTYPE html>
<!-- Code by CodeWithNepal - codewithnepal -->
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Login Form validation using HTML CSS & JS | CodeWithNepal</title>
<link rel="stylesheet" href="style.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.3/css/all.min.css"/>
</head>
<body>
<div class="wrapper">
<header>Login Form</header>
<form action="#">
<div class="field email">
<div class="input-area">
<input type="text" placeholder="Email Address">
<i class="icon fas fa-envelope"></i>
<i class="error error-icon fas fa-exclamation-circle"></i>
</div>
<div class="error error-txt">Email can't be blank</div>
</div>
<div class="field password">
<div class="input-area">
<input type="password" placeholder="Password">
<i class="icon fas fa-lock"></i>
<i class="error error-icon fas fa-exclamation-circle"></i>
</div>
<div class="error error-txt">Password can't be blank</div>
</div>
<div class="pass-txt"><a href="#">Forgot password?</a></div>
<input type="submit" value="Login">
</form>
<div class="sign-txt">Not yet member? <a href="#">Signup now</a></div>
</div>
<script src="script.js"></script>
</body>
</html>Step 2
And, create a CSS file named style.css and paste the indicated codes into your CSS file. Remember, you must create a .css file.
@import url('https://fonts.googleapis.com/css2?family=Poppins:[email protected];500;600&display=swap');
*{
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: "Poppins", sans-serif;
}
body{
width: 100%;
height: 100vh;
display: flex;
align-items: center;
justify-content: center;
background: #3853bf;
}
::selection{
color: #fff;
background: #3853bf;
}
.wrapper{
width: 380px;
padding: 40px 30px 50px 30px;
background: #fff;
border-radius: 5px;
text-align: center;
box-shadow: 10px 10px 15px rgba(0,0,0,0.1);
}
.wrapper header{
font-size: 35px;
font-weight: 600;
}
.wrapper form{
margin: 40px 0;
}
form .field{
width: 100%;
margin-bottom: 20px;
}
form .field.shake{
animation: shake 0.3s ease-in-out;
}
@keyframes shake {
0%, 100%{
margin-left: 0px;
}
20%, 80%{
margin-left: -12px;
}
40%, 60%{
margin-left: 12px;
}
}
form .field .input-area{
height: 50px;
width: 100%;
position: relative;
}
form input{
width: 100%;
height: 100%;
outline: none;
padding: 0 45px;
font-size: 18px;
background: none;
caret-color: #5372F0;
border-radius: 5px;
border: 1px solid #bfbfbf;
border-bottom-width: 2px;
transition: all 0.2s ease;
}
form .field input:focus,
form .field.valid input{
border-color: #5372F0;
}
form .field.shake input,
form .field.error input{
border-color: #dc3545;
}
.field .input-area i{
position: absolute;
top: 50%;
font-size: 18px;
pointer-events: none;
transform: translateY(-50%);
}
.input-area .icon{
left: 15px;
color: #bfbfbf;
transition: color 0.2s ease;
}
.input-area .error-icon{
right: 15px;
color: #dc3545;
}
form input:focus ~ .icon,
form .field.valid .icon{
color: #5372F0;
}
form .field.shake input:focus ~ .icon,
form .field.error input:focus ~ .icon{
color: #bfbfbf;
}
form input::placeholder{
color: #bfbfbf;
font-size: 17px;
}
form .field .error-txt{
color: #dc3545;
text-align: left;
margin-top: 5px;
}
form .field .error{
display: none;
}
form .field.shake .error,
form .field.error .error{
display: block;
}
form .pass-txt{
text-align: left;
margin-top: -10px;
}
.wrapper a{
color: #5372F0;
text-decoration: none;
}
.wrapper a:hover{
text-decoration: underline;
}
form input[type="submit"]{
height: 50px;
margin-top: 30px;
color: #fff;
padding: 0;
border: none;
background: #5372F0;
cursor: pointer;
border-bottom: 2px solid rgba(0,0,0,0.1);
transition: all 0.3s ease;
}
form input[type="submit"]:hover{
background: #2c52ed;
}Step 3
Last, create a JavaScript file with the name of script.js and paste the given codes into your JavaScript file. Remember, you’ve to create a file with a .js extension.
const form = document.querySelector("form");
eField = form.querySelector(".email"),
eInput = eField.querySelector("input"),
pField = form.querySelector(".password"),
pInput = pField.querySelector("input");
form.onsubmit = (e)=>{
e.preventDefault(); //preventing from form submitting
//if email and password is blank then add shake class in it else call specified function
(eInput.value == "") ? eField.classList.add("shake", "error") : checkEmail();
(pInput.value == "") ? pField.classList.add("shake", "error") : checkPass();
setTimeout(()=>{ //remove shake class after 500ms
eField.classList.remove("shake");
pField.classList.remove("shake");
}, 500);
eInput.onkeyup = ()=>{checkEmail();} //calling checkEmail function on email input keyup
pInput.onkeyup = ()=>{checkPass();} //calling checkPassword function on pass input keyup
function checkEmail(){ //checkEmail function
let pattern = /^[^ ][email protected][^ ]+\.[a-z]{2,3}$/; //pattern for validate email
if(!eInput.value.match(pattern)){ //if pattern not matched then add error and remove valid class
eField.classList.add("error");
eField.classList.remove("valid");
let errorTxt = eField.querySelector(".error-txt");
//if email value is not empty then show please enter valid email else show Email can't be blank
(eInput.value != "") ? errorTxt.innerText = "Enter a valid email address" : errorTxt.innerText = "Email can't be blank";
}else{ //if pattern matched then remove error and add valid class
eField.classList.remove("error");
eField.classList.add("valid");
}
}
function checkPass(){ //checkPass function
if(pInput.value == ""){ //if pass is empty then add error and remove valid class
pField.classList.add("error");
pField.classList.remove("valid");
}else{ //if pass is empty then remove error and add valid class
pField.classList.remove("error");
pField.classList.add("valid");
}
}
//if eField and pField doesn't contains error class that mean user filled details properly
if(!eField.classList.contains("error") && !pField.classList.contains("error")){
window.location.href = form.getAttribute("action"); //redirecting user to the specified url which is inside action attribute of form tag
}
}Output
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