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CSS Image Dialog (Image Modal)

We will use CSS styles for creating image dialog and hide it by default. We will then use javascript to show or hide the image dialog (image modal).

Image Dialog

First, use CSS to create a modal window (dialog box), and hide it by default.

Then, use a JavaScript to show the modal window and to display the image inside the modal, when a user clicks on the image:

Image Modal

Here, we use CSS to create a modal (dialog box) that is hidden by default.

We use JavaScript to trigger the modal and to display the current image inside the modal when it is clicked on. Also note that we use the value from the image's "alt" attribute as an image caption text inside the modal.

Road to life

Example

<!DOCTYPE html>
<html>
<head>
<style>
#myImg {
display: block;
margin: 10px auto;
border-radius: 20px;
cursor: pointer;
transition: 0.3s;
}

#myImg:hover {opacity: 0.7;}

/* The Modal (background) */
.modal {
display: none; /* Hidden by default */
position: fixed; /* Stay in place */
z-index: 1; /* Sit on top */
padding-top: 100px; /* Location of the box */
left: 0;
top: 0;
width: 100%; /* Full width */
height: 100%; /* Full height */
overflow: auto; /* Enable scroll if needed */
background-color: rgb(0,0,0); /* Fallback color */
background-color: rgba(0,0,0,0.9); /* Black w/ opacity */
}

/* Modal Content (image) */
.modal-content {
margin: auto;
display: block;
width: 80%;
max-width: 700px;
}

/* Caption of Modal Image */
#caption {
margin: auto;
display: block;
width: 80%;
max-width: 700px;
text-align: center;
color: #ccc;
padding: 10px 0;
height: 150px;
}

/* Add Animation */
.modal-content, #caption {
animation-name: zoom;
animation-duration: 0.6s;
}

@keyframes zoom {
from {transform: scale(0.1)}
to {transform: scale(1)}
}

/* The Close Button */
.close {
position: absolute;
top: 15px;
right: 35px;
color: #f1f1f1;
font-size: 40px;
font-weight: bold;
transition: 0.3s;
}

.close:hover,
.close:focus {
color: #bbb;
text-decoration: none;
cursor: pointer;
}

/* 100% Image Width on Smaller Screens */
@media only screen and (max-width: 700px){
.modal-content {
width: 100%;
}
}
</style>
</head>
<body>

<div style="padding: 25px; text-align: center">

<h2>Image Modal</h2>

<p>Here, we use CSS to create a modal (dialog box) that is hidden by default.</p>
<p>We use JavaScript to trigger the modal and to display the current image inside the modal when it is clicked on. Also note that we use the value from the image's "alt" attribute as an image caption text inside the modal.</p>

</div>

<img id="myImg" src="img_road.jpg" alt="Road to life" width="400" height="auto">

<!-- The Modal -->
<div id="myModal" class="modal">
<span class="close">&times;</span>
<img class="modal-content" id="img01">
<div id="caption"></div>
</div>

<script>
// Get the modal
var modal = document.getElementById('myModal');

// Get the image and insert it inside the modal - use its "alt" text as a caption
var img = document.getElementById('myImg');
var modalImg = document.getElementById("img01");
var captionText = document.getElementById("caption");
img.onclick = function(){
modal.style.display = "block";
modalImg.src = this.src;
captionText.innerHTML = this.alt;
}

// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];

// When the user clicks on <span> (x), close the modal
span.onclick = function() {
modal.style.display = "none";
}
</script>

</body>
</html>

Example Explained

  • #myImg:hover {opacity: 0.7;} - This changed the opacity of image to 0.7 (70%), when the mouse comes over it.
  • @keyframes zoom { from {transform: scale(0.1)} to {transform: scale(1)} } - This animation chnages the size scale of elements from 0.1 to 1. @keyframes are used to add animations at intevals to the element.

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