Form Validation using HTML, CSS & JavaScript
Introduction
Hello, today we’re going to learn how to use HTML, CSS & JavaScript to create a Form Validation. By following these instructions, you can simply make this Form Validation in HTML, CSS & JavaScript. Simply by adhering to the procedures mentioned below, you will be able to develop this amazing Form Validation.
Let us understand how an Form Validation contributes, Earlier when we used to fill up the form there was no check or verification on the input to see whether the details belong to the user itself or it is fake or stolen from someone. So to make it authenticate or see whether the input is correct or not we will see the use of form validator in this project.
Project Description
Step 1
The HTML (Hypertext Markup Language) will help us to create the structure for the list with some necessary attributes and elements to make Form Validation Project.
Step 2
Then we will use CSS (Cascading Stylesheet) which will help us to style or design the project with suitable padding and alignment in the Form Validation Project.
Portfolio Website using HTML and CSS (Source Code)
Step 3
At last we will use JS (JavaScript) which will add a logic to make the Form Validation Project functioning from the user end.
I hope you have got an idea about the project.
HTML Code for Form Validation
<html> <head> <title>Form Validation</title> <meta name="viewport" content="width=device-width, initial-scale=1" /> <!-- Google Fonts --> <link href="https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600&display=swap" rel="stylesheet" /> <!-- Stylesheet --> <link rel="stylesheet" href="style.css" /> </head> <body> <div class="container"> <form autocomplete="off"> <h4>Create Your Account</h4> <div class="input-section"> <label>First Name <span class="required-color">*</span></label> <input type="text" placeholder="Enter First Name" id="first-name-input" required /> <span id="first-name-error" class="hide required-color error-message" >Invalid Input</span > <span id="empty-first-name" class="hide required-color error-message" >First Name Cannot Be Empty</span > </div> <div class="input-section"> <label>Last Name <span class="required-color">*</span></label> <input type="text " placeholder="Enter Last Name" id="last-name-input" required /> <span id="last-name-error" class="hide required-color error-message" >Invalid Input</span > <span id="empty-last-name" class="hide required-color error-message"> Last Name Cannot Be Empty </span> </div> <div class="input-section"> <label>Email <span class="required-color">*</span></label> <input type="email" placeholder="Enter Email" id="email" required /> <span id="email-error" class="hide required-color error-message" >Invalid Email</span > <span id="empty-email" class="hide required-color error-message" >Email Cannot Be Empty</span > </div> <div class="input-section"> <label>Phone <span class="required-color">*</span></label> <input type="text" placeholder="Enter Phone Number" id="phone" required /> <span id="phone-error" class="hide required-color error-message" >Phone Number Should Have 10 Digits</span > <span id="empty-phone" class="hide required-color error-message"> Phone cannot be empty </span> </div> <div class="input-section"> <label>Password <span class="required-color">*</span></label> <input type="password" placeholder="Enter Password" id="password" required /> <span id="password-error" class="hide required-color error-message"> Passwords Should Have Letter, Special symbols, Numbers And Length >= 8 </span> <span id="empty-password" class="hide required-color error-message"> Password Cannot Be Empty </span> </div> <div class="input-section"> <label>Confirm Password <span class="required-color">*</span></label> <input type="password" id="verify-password" placeholder="Confirm Password" required /> <span id="verify-password-error" class="hide required-color error-message" >Should Be Same As Previous Password</span > <span id="empty-verify-password" class="hide required-color error-message" >Password Cannot Be Empty</span > </div> <button id="submit-button">Sign Up</button> </form> </div> <!-- Script --> <script src="script.js"></script> </body> </html>
First we’ll start with creating the structure of the Form Validation project for that as you can see the above code we have used all the necessary elements & attributes to setup the structure. Let us know code the CSS part to add styling and aligned the tags.
CSS Code for Form Validation
* { padding: 0; margin: 0; box-sizing: border-box; font-family: "Poppins", sans-serif; } body { background-color: #3164ff; } .container { width: 90vw; max-width: 600px; padding: 2em 1.5em; background-color: #ffffff; margin: 1em auto; border-radius: 0.5em; } h4 { font-size: 1.5em; } .input-section { margin: 0.5em 0; } label, .error-message { display: block; font-size: 1em; } label { margin-bottom: 0.5em; font-weight: 500; } .error-message { margin-top: 0.2em; } input, button { display: block; outline: none; width: 100%; padding: 0.5em; border-radius: 0.3em; } input { padding: 1em 0.5em; border: 1.5px solid #d0d0d0; } button { font-size: 1em; background-color: #3164ff; border: none; color: #ffffff; padding: 0.8em 0; margin-top: 2em; } .required-color { color: #ff4747; } .error { border-color: #ff4747; } .valid { border-color: #37a137; } .hide { display: none; } @media only screen and (max-width: 450px) { .container { font-size: 14px; } }
Second comes the CSS code, which is mentioned above in that we have styled for the structure we have padded as well as aligned the Form Validation project so that it is properly situated and doesn’t get messy with suitable CSS elements. Now we have created the structure using HTML and styled the webpage using CSS its time to add the functionality using JavaScript in this project.
50+ HTML, CSS & JavaScript Projects With Source Code
JavaScript Code for Form Validation
//First Name let firstNameInput = document.getElementById("first-name-input"); let firstNameError = document.getElementById("first-name-error"); let emptyFirstNameError = document.getElementById("empty-first-name"); //Last name let lastNameInput = document.getElementById("last-name-input"); let lastNameError = document.getElementById("last-name-error"); let emptyLastNameError = document.getElementById("empty-last-name"); //Phone let phoneInput = document.getElementById("phone"); let phoneError = document.getElementById("phone-error"); let emptyPhoneError = document.getElementById("empty-phone"); //Email let emailInput = document.getElementById("email"); let emailError = document.getElementById("email-error"); let emptyEmailError = document.getElementById("empty-email"); //Password let passwordInput = document.getElementById("password"); let passwordError = document.getElementById("password-error"); let emptyPasswordError = document.getElementById("empty-password"); //Verify Password let verifyPasswordInput = document.getElementById("verify-password"); let verifyPasswordError = document.getElementById("verify-password-error"); let emptyVerifyPasswordError = document.getElementById("empty-verify-password"); //Submit let submitButton = document.getElementById("submit-button"); //Valid let validClasses = document.getElementsByClassName("valid"); let invalidClasses = document.getElementsByClassName("error"); //Password Verification const passwordVerify = (password) => { const regex = /^(?=.+[a-z])(?=.+[A-Z])(?=.+[0-9])(?=.+[\$\%\^\&\!@\#\*\(\)\+\=`~\?\>\<])/; return regex.test(password) && password.length >= 8; }; //Text verification (if input contains only text) const textVerify = (text) => { const regex = /^[a-zA-Z]{3,}$/; return regex.test(text); }; //Phone number verification const phoneVerify = (number) => { const regex = /^[0-9]{10}$/; return regex.test(number); }; //Email verification const emailVerify = (input) => { const regex = /^[a-z0-9_]+@[a-z]{3,}\.[a-z\.]{3,}$/; return regex.test(input); }; //For empty input - accepts(input,empty error for that input and other errors) const emptyUpdate = ( inputReference, emptyErrorReference, otherErrorReference ) => { if (!inputReference.value) { //input is null/empty emptyErrorReference.classList.remove("hide"); otherErrorReference.classList.add("hide"); inputReference.classList.add("error"); } else { //input has some content emptyErrorReference.classList.add("hide"); } }; //For error styling and displaying error message const errorUpdate = (inputReference, errorReference) => { errorReference.classList.remove("hide"); inputReference.classList.remove("valid"); inputReference.classList.add("error"); }; //For no errors const validInput = (inputReference) => { inputReference.classList.remove("error"); inputReference.classList.add("valid"); }; //First name firstNameInput.addEventListener("input", () => { if (textVerify(firstNameInput.value)) { //If verification returns true firstNameError.classList.add("hide"); validInput(firstNameInput); } else { //for false errorUpdate(firstNameInput, firstNameError); //empty checker emptyUpdate(firstNameInput, emptyFirstNameError, firstNameError); } }); //Last name lastNameInput.addEventListener("input", () => { if (textVerify(lastNameInput.value)) { lastNameError.classList.add("hide"); validInput(lastNameInput); } else { errorUpdate(lastNameInput, lastNameError); emptyUpdate(lastNameInput, emptyLastNameError, lastNameError); } }); //Phone phoneInput.addEventListener("input", () => { if (phoneVerify(phoneInput.value)) { phoneError.classList.add("hide"); validInput(phoneInput); } else { errorUpdate(phoneInput, phoneError); emptyUpdate(phoneInput, emptyPhoneError, phoneError); } }); //Email emailInput.addEventListener("input", () => { if (emailVerify(emailInput.value)) { emailError.classList.add("hide"); validInput(emailInput); } else { errorUpdate(emailInput, emailError); emptyUpdate(emailInput, emptyEmailError, emailError); } }); //Password passwordInput.addEventListener("input", () => { if (passwordVerify(passwordInput.value)) { passwordError.classList.add("hide"); validInput(passwordInput); } else { errorUpdate(passwordInput, passwordError); emptyUpdate(passwordInput, emptyPasswordError, passwordError); } }); //Verify password verifyPasswordInput.addEventListener("input", () => { if (verifyPasswordInput.value === passwordInput.value) { verifyPasswordError.classList.add("hide"); validInput(verifyPasswordInput); } else { errorUpdate(verifyPasswordInput, verifyPasswordError); emptyUpdate(passwordInput, emptyVerifyPasswordError, verifyPasswordError); } }); //Submit button submitButton.addEventListener("click", () => { if (validClasses.length == 6 && invalidClasses.length == 0) { alert("Success"); } else { alert("Error"); } });
Last stage of the project the JavaScript in which we have added the logical and coded as per the requirement with some conditions. In this code each input is defined which is built in the HTML code and given a name so that it can be called in terms of JavaScript. In the verification part we have defined when to show the message to validate each field. Let us see the Final Output of the project Form Validation using HTML, CSS & JavaScript (Source Code).
Output
Live Preview of Form Validation using HTML, CSS & JavaScript
See the Pen
Form by Harsh Sawant (@harshh9)
on CodePen.
We have Successfully created our Form Validation using HTML, CSS & JavaScript (Source Code). You can use this project for your personal needs and the respective lines of code are given with the code pen link mentioned above.
If you find out this Blog helpful, then make sure to search code with random on google for Front End Projects with Source codes and make sure to Follow the Code with Random Instagram page.
Code Idea – codingartist
Written By – Harsh Sawant
Code By – @harshh9