JavaScript Project - Modal Box

In this tutorial, we will learn how to create a Modal Box with HTML, CSS, and JavaScript.

A modal is a dialog box/popup window that is displayed on top of the current page.

We are going to use vanilla JavaScript to develop this Modal Box.

JavaScript Modal Box

Create a folder called modal as project workspace and we will create all the project files inside this folder.

1. index.html

Let's create index.html and add the following code to it:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Modal</title>
    <!-- font-awesome -->
    <link
      rel="stylesheet"
      href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.14.0/css/all.min.css"
    />
    <!-- styles -->
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <!-- hero -->
    <header class="hero">
      <div class="banner">
        <h1>modal project</h1>
        <button class="btn modal-btn">
          open modal
        </button>
      </div>
    </header>
    <!-- modal -->
    <div class="modal-overlay">
      <div class="modal-container">
        <h3>modal content</h3>
        <button class="close-btn"><i class="fas fa-times"></i></button>
      </div>
    </div>
    <!-- javascript -->
    <script src="script.js"></script>
  </body>
</html>

2. script.js

Let's create a JavaScript file named script.js and add the following JavaScript code to it:

// select modal-btn,modal-overlay,close-btn
// listen for click events on modal-btn and close-btn
// when user clicks modal-btn add .open-modal to modal-overlay
// when user clicks close-btn remove .open-modal from modal-overlay

const modalBtn = document.querySelector(".modal-btn");
const modal = document.querySelector(".modal-overlay");
const closeBtn = document.querySelector(".close-btn");

modalBtn.addEventListener("click", function () {
  modal.classList.add("open-modal");
});
closeBtn.addEventListener("click", function () {
  modal.classList.remove("open-modal");
});

3. style.css

Let's create a CSS file named style.css and add the following CSS code to it:

/*
=============== 
Fonts
===============
*/
@import url("https://fonts.googleapis.com/css?family=Open+Sans|Roboto:400,700&display=swap");

/*
=============== 
Variables
===============
*/

:root {
  /* dark shades of primary color*/
  --clr-primary-1: hsl(205, 86%, 17%);
  --clr-primary-2: hsl(205, 77%, 27%);
  --clr-primary-3: hsl(205, 72%, 37%);
  --clr-primary-4: hsl(205, 63%, 48%);
  /* primary/main color */
  --clr-primary-5: #49a6e9;
  /* --clr-primary-5: rgb(73, 166, 233); */
  /* lighter shades of primary color */
  --clr-primary-6: hsl(205, 89%, 70%);
  --clr-primary-7: hsl(205, 90%, 76%);
  --clr-primary-8: hsl(205, 86%, 81%);
  --clr-primary-9: hsl(205, 90%, 88%);
  --clr-primary-10: hsl(205, 100%, 96%);
  /* darkest grey - used for headings */
  --clr-grey-1: hsl(209, 61%, 16%);
  --clr-grey-2: hsl(211, 39%, 23%);
  --clr-grey-3: hsl(209, 34%, 30%);
  --clr-grey-4: hsl(209, 28%, 39%);
  /* grey used for paragraphs */
  --clr-grey-5: hsl(210, 22%, 49%);
  --clr-grey-6: hsl(209, 23%, 60%);
  --clr-grey-7: hsl(211, 27%, 70%);
  --clr-grey-8: hsl(210, 31%, 80%);
  --clr-grey-9: hsl(212, 33%, 89%);
  --clr-grey-10: hsl(210, 36%, 96%);
  --clr-white: #fff;
  --clr-red-dark: hsl(360, 67%, 44%);
  --clr-red-light: hsl(360, 71%, 66%);
  --clr-green-dark: hsl(125, 67%, 44%);
  --clr-green-light: hsl(125, 71%, 66%);
  --clr-black: #222;
  --ff-primary: "Roboto", sans-serif;
  --ff-secondary: "Open Sans", sans-serif;
  --transition: all 0.3s linear;
  --spacing: 0.25rem;
  --radius: 0.5rem;
  --light-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  --dark-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  --max-width: 1170px;
  --fixed-width: 620px;
}
/*
=============== 
Global Styles
===============
*/

*,
::after,
::before {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: var(--ff-secondary);
  background: var(--clr-grey-10);
  color: var(--clr-grey-1);
  line-height: 1.5;
  font-size: 0.875rem;
}
ul {
  list-style-type: none;
}
a {
  text-decoration: none;
}
img:not(.logo) {
  width: 100%;
}
img {
  display: block;
}

h1,
h2,
h3,
h4 {
  letter-spacing: var(--spacing);
  text-transform: capitalize;
  line-height: 1.25;
  margin-bottom: 0.75rem;
  font-family: var(--ff-primary);
}
h1 {
  font-size: 3rem;
}
h2 {
  font-size: 2rem;
}
h3 {
  font-size: 1.25rem;
}
h4 {
  font-size: 0.875rem;
}
p {
  margin-bottom: 1.25rem;
  color: var(--clr-grey-5);
}
@media screen and (min-width: 800px) {
  h1 {
    font-size: 4rem;
  }
  h2 {
    font-size: 2.5rem;
  }
  h3 {
    font-size: 1.75rem;
  }
  h4 {
    font-size: 1rem;
  }
  body {
    font-size: 1rem;
  }
  h1,
  h2,
  h3,
  h4 {
    line-height: 1;
  }
}
/*  global classes */

.btn {
  text-transform: uppercase;
  background: transparent;
  color: var(--clr-black);
  padding: 0.375rem 0.75rem;
  letter-spacing: var(--spacing);
  display: inline-block;
  transition: var(--transition);
  font-size: 0.875rem;
  border: 2px solid var(--clr-black);
  cursor: pointer;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
  border-radius: var(--radius);
}
.btn:hover {
  color: var(--clr-white);
  background: var(--clr-black);
}
/* section */
.section {
  padding: 5rem 0;
}

.section-center {
  width: 90vw;
  margin: 0 auto;
  max-width: 1170px;
}
@media screen and (min-width: 992px) {
  .section-center {
    width: 95vw;
  }
}
main {
  min-height: 100vh;
  display: grid;
  place-items: center;
}
/*
=============== 
Modal
===============
*/
.hero {
  min-height: 100vh;
  background: url("./hero.jpeg") center/cover no-repeat;
  display: grid;
  place-items: center;
}
.banner {
  background: var(--clr-white);
  padding: 4rem 0;
  border-radius: var(--radius);
  box-shadow: var(--light-shadow);
  text-align: center;
  width: 90vw;
  max-width: var(--fixed-width);
}
.modal-btn {
  margin-top: 2rem;
  background: var(--clr-primary-5);
  border-color: var(--clr-primary-5);
  color: var(--clr-white);
}
.modal-btn:hover {
  background: transparent;
  color: var(--clr-primary-5);
}
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(73, 166, 233, 0.5);
  display: grid;
  place-items: center;
  transition: var(--transition);
  visibility: hidden;
  z-index: -10;
}
/* OPEN/CLOSE MODAL */
.open-modal {
  visibility: visible;
  z-index: 10;
}
.modal-container {
  background: var(--clr-white);
  border-radius: var(--radius);
  width: 90vw;
  height: 30vh;
  max-width: var(--fixed-width);
  text-align: center;
  display: grid;
  place-items: center;
  position: relative;
}
.close-btn {
  position: absolute;
  top: 1rem;
  right: 1rem;
  font-size: 2rem;
  background: transparent;
  border-color: transparent;
  color: var(--clr-red-dark);
  cursor: pointer;
  transition: var(--transition);
}
.close-btn:hover {
  color: var(--clr-red-light);
  transform: scale(1.3);
}

Open index.html in Browser

Let's open the index.html file in the browser and you will be able to see the following screen:


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