Modal pop-up tutorial

Video

Demo

HTML

<!DOCTYPE html>
<html>
    <head>
        <title>Modals</title>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
    </head>
    <body>
        <div class="page">
            <h1>Modals</h1>
            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit...</p>
            <a href="#message1" class="modal-link" >Click here!</a>
            <p>Ut euismod sapien massa, a pulvinar metus condimentum in...</p>
            <a href="#message2" class="modal-link" >Click here as well!</a>
            <p>Sed auctor malesuada quam...</p>
            <p>Fusce vel ipsum eu sem consectetur dignissim at in orci..</p>
            <a href="#message1" class="modal-link" >Click here as well!</a>
        </div>
        <div class="modal-messages" style="display:none;">
            <span id="message1">This is message 1<br/><strong>Some text in bold</strong></span>
            <span id="message2">This is message 2</span>
        </div>
        <!--Elements for the overlay screen-->
        <div class="overlay-outer" id="overlay-outer">
            <div class="overlay-inner" id="overlay-inner">
                <div class="overlay-content" id="overlay-content">
                    <p class="modal-string" id="modal-string">Modal content goes here</p>
                    <button class="close-btn" id="close-btn" title="Close window">X</button>
                </div>
            </div>  
        </div>
    </body>
</html>

CSS

*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
p{
    margin: 10px 0;
}
.page{
    max-width: 700px;
    margin:20px auto;
}
.overlay-outer{
    display: none;
    position:fixed;
    top: 0;
    left: 0;
    width:100%;
    height:100%;
    background: rgba(256,256,256,0.8);
}
.overlay-inner{
    display:table-cell;
    vertical-align:middle;
    text-align:center;
}
.overlay-content{
    display:inline-block;
    background:#eee;
    box-shadow: 1px 1px 3px #444;
    padding: 1rem;
    position:relative;
}
.close-btn{
    position:absolute;
    right: -10px;
    top: -10px;
    padding:5px 8px;
    background:#111;
    color:#fff;
    border:none;
    cursor:pointer;
}

JavaScript

Insert or this code in your document within script tags just before the closing body tag

function pageLoad () {
    //Handler functions for the events
    function openModal (event) {
        event.preventDefault ();
        modalString.innerHTML =  document.querySelector(this.getAttribute('href')).innerHTML;
        overlayOuter.style.display = 'table';
    }
    function closeModal () {
        modalString.innerHTML =  '';
        overlayOuter.style.display = 'none';
    }
    //Reference the DOM elements
    var overlayOuter = document.getElementById('overlay-outer');
    var modalString = document.getElementById('modal-string');
    var closeOverlay = document.getElementById('close-btn');
    var modalLinks = document.querySelectorAll('.modal-link');
    //Attach eventlisteners to the elements
    for (var i = 0; i < modalLinks.length; i++){
        modalLinks[i].addEventListener('click', openModal, false);
    }
    closeOverlay.addEventListener('click', closeModal, false);
}
window.addEventListener('load', pageLoad);

Modal pop-up tutorial

Video

Demo

HTML

CSS

JavaScript

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