A simple CSS-driven vanilla Javascript modal plugin.

• Lightweight, no dependencies
• Customizable through CSS
• Works in IE9 and up

Reference the modal stylesheet in the document head

<link rel="stylesheet" href="css/modal.css">

Reference the modal plugin before the body ends

<script src="js/modal.js"></script>

Create a modal element in the document and specify an id

<div class="modal" id="modal-example">
  <div class="modal__window">...</div>
</div>

Create a button element within the modal that has a data-close-modal attribute

<button type="button" data-close-modal>Close modal</button>

Note: You can create as many close buttons within the modal as you like. Any element with a data-close-modal attribute living inside the modal will trigger the closing of the modal when clicked.

Modal element markup example:

<div class="modal" id="modal-example">
  <div class="modal__window">
    <button class="modal__close-btn" type="button" data-close-modal>X</button>
    <div class="modal__header">
       <h2 class="modal__title">Title of modal</h2>
     </div>
     <div class="modal__content">
       <!-- Modal content -->
       <button type="button" data-close-modal>Close modal</button>
     </div>
  </div>
</div>

Outside of the modal, if using a button element to trigger the opening of the modal, define the trigger button and reference the id of the modal as the data-trigger-modal attribute value

<button type="button" data-trigger-modal="modal-example">Trigger Example modal</button>

In your JS, reference the modal element, pass it in as an argument and initialize an instance of the modal

var modalEl = document.getElementById('modal-example');
var modalExample = new Modal(modalEl);
modalExample.init();

Click on the trigger button to open the modal and that's all there is to it!

Additionally, you can open and close a modal using the openModal and closeModal methods

modalExample.openModal();

modalExample.closeModal();