Modal Popup with HTML, CSS, and jQuery

A modal is a dialog box or popup window that is displayed over the current page. The modal is used to display additional HTML components on the current page without changing/hiding the existing elements. The modal popup is displayed on top of the current page with the backdrop.

In this example code snippet, we will create a modal popup with HTML, CSS, and jQuery.

• A trigger button will open a modal window.
• You can add custom content or elements in the popup body.
• The close button in the popup will close the modal. Also, clicking on the popup background will close the modal automatically.

HTML Code:

<!-- Button to trigger modal -->
<button id="mbtn">Open Modal</button>
    
<!-- The Modal -->
<div id="modalDialog" class="modal">
    <div class="modal-content animate-top">
        <div class="modal-header">
            <h5 class="modal-title">Modal title</h5>
            <button type="button" class="close">
                <span aria-hidden="true">x</span>
            </button>
        </div>
        <div class="modal-body">
            <p>Woohoo, you're reading this text in a modal!</p>
            <p>Modal body content goes here...</p>
        </div>
        <div class="modal-footer">
            <button type="button" class="btn btn-secondary close">Close</button>
            <button type="button" class="btn btn-primary">Save changes</button>
        </div>
    </div>
</div>

jQuery Library:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.6.1/jquery.min.js"></script>

JavaScript Code:

// Get the modal
var modal = $('#modalDialog');

// Get the button that opens the modal
var btn = $("#mbtn");

// Get the <span> element that closes the modal
var span = $(".close");

$(document).ready(function(){
    // When the user clicks the button, open the modal 
    btn.on('click', function() {
        modal.show();
    });
    
    // When the user clicks on <span> (x), close the modal
    span.on('click', function() {
        modal.fadeOut();
    });
});

// When the user clicks anywhere outside of the modal, close it
$('body').bind('click', function(e){
    if($(e.target).hasClass("modal")){
        modal.fadeOut();
    }
});

CSS Code:

.animate-top{
    position:relative;
    animation:animatetop 0.4s
}
@keyframes animatetop{
    from{top:-300px;opacity:0} 
    to{top:0;opacity:1}
}
.modal {
  display: none;
  position: fixed;
  z-index: 1;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: auto;
  background-color: rgba(0, 0, 0, 0.275);
}

.modal-content {
  margin: 5% auto;
  width: 500px;
  max-width: 90%;
  background-color: #fff;
  border: 1px solid rgba(0, 0, 0, 0.175);
  border-radius: .3rem;
  outline: 0;
}
.modal-header {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: start;
    -ms-flex-align: start;
    align-items: flex-start;
    -webkit-box-pack: justify;
    -ms-flex-pack: justify;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid #e9ecef;
    border-top-left-radius: .3rem;
    border-top-right-radius: .3rem;
}
.modal-title {
    margin-bottom: 0;
    line-height: 1.5;
    margin-top: 0;
    font-size: 1.25rem;
}
.modal-header .close {
    float: right;
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1;
    color: #000;
    text-shadow: 0 1px 0 #fff;
    opacity: .5;
    padding: 1rem;
    margin: -1rem -1rem -1rem auto;
    background-color: transparent;
    border: 0;
}
.close:not(:disabled):not(.disabled) {
    cursor: pointer;
}

.modal-body {
    flex: 1 1 auto;
    padding: 1rem;
}
.modal-body p {
    margin-top: 0;
    margin-bottom: 1rem;
}
.modal-footer {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    -webkit-box-pack: end;
    -ms-flex-pack: end;
    justify-content: flex-end;
    padding: 1rem;
    border-top: 1px solid #e9ecef;
}
.modal-footer>*{
    margin: 5px;
}

/* buttons */
.btn {
    display: inline-block;
    font-weight: 400;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    border: 1px solid transparent;
    padding: .375rem .75rem;
    font-size: 1rem;
    line-height: 1.5;
    border-radius: .25rem;
    cursor: pointer;
}
.btn:focus, .btn:hover {
    text-decoration: none;
}
.btn-primary {
    color: #fff;
    background-color: #007bff;
    border-color: #007bff;
}
.btn-primary:hover {
    color: #fff;
    background-color: #0069d9;
    border-color: #0062cc;
}
.btn-secondary {
    color: #fff;
    background-color: #7c8287;
    border-color: #7c8287;
}
.btn-secondary:hover {
    color: #fff;
    background-color: #6c757d;
    border-color: #6c757d;
}