Building Custom Modals in JavaScript Using Data Attributes

by abhijeetsonawane

HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <!-- Modal 1 container -->
<div class="modal" id="custom-modal1">
    <!-- Modal content -->
    <div class="modal-content">
        <!-- Modal header -->
        <div class="modal-header">
            <h4 class="modal-title">Modal 1 Title</h4>
            <!-- Close modal -->
            <span class="close" data-modal-hide="custom-modal1">&times;</span>
        </div>
        <!-- Modal body -->
        <div class="modal-body">
            <p>
            Lorem, ipsum dolor sit amet consectetur adipisicing elit.
            Consectetur harum reiciendis iusto dolore maxime aliquam alias. Rem
            aliquam minima excepturi.
            </p>
        </div>
    </div>
</div>
<button class="btn-primary" data-modal-show="custom-modal1">
      Open Modal 1
</button>
<!-- Modal 2 container -->
<div class="modal" id="custom-modal2">
    <!-- Modal content -->
    <div class="modal-content">
        <!-- Modal header -->
        <div class="modal-header">
            <h4 class="modal-title">Modal 2 Title</h4>
            <!-- Close modal -->
            <span class="close" data-modal-hide="custom-modal2">&times;</span>
        </div>
        <!-- Modal body -->
        <div class="modal-body">
            <p>
            Lorem, ipsum dolor sit amet consectetur adipisicing elit.
            Consectetur harum reiciendis iusto dolore maxime aliquam alias. Rem
            aliquam minima excepturi.
            </p>
        </div>
    </div>
</div>
<button class="btn-primary" data-modal-show="custom-modal2">
    Open Modal 2
</button>

</body>
</html>

CSS

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
}

.modal-content {
    background: #fff;
    border-radius: 5px;
    padding: 20px;
    text-align: center;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 350px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    margin: 0;
    font-size: 20px;
}

.close {
    color: #aaa;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
}
.modal-body {
    padding-top: 5px;
    font-size: 16px;
}

.btn-primary {
    background-color: #008CBA;
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    border-radius: 8px;
    cursor: pointer;
}

JavaScript

// Open modal function
function openModal(modalId) {
  const modal = document.querySelector(`#${modalId}`);
  modal.style.display = "block";
}

// Close modal function
function closeModal(modalId) {
  const modal = document.querySelector(`#${modalId}`);
  modal.style.display = "none";
}

// Open modal when trigger button is clicked
document.querySelectorAll("[data-modal-show]").forEach((triggerButton) => {
  triggerButton.addEventListener("click", () => {
    const modalId = triggerButton.getAttribute("data-modal-show");
    openModal(modalId);
  });
});

// Close modal when close button is clicked
document.querySelectorAll("[data-modal-hide]").forEach((closeButton) => {
  closeButton.addEventListener("click", () => {
    const modalId = closeButton.getAttribute("data-modal-hide");
    closeModal(modalId);
  });
});