Morphing Modal Window

Morphing Modal Window is a call-to-action button that animates and turns into a full-size modal window.

Modal windows are used to display related content, by hiding temporarily the main content. If we imagine our web page as layers distributed along the z-axis, modal windows are on top.

With this nugget we wanted to spice-up the way we fire the modal window: the button that triggers the action animates and turns into a full-width new page. We tried something similar with the product quick view nugget.

The final result is powered by a combination of CSS transition and transformations, jQuery and Velocity.

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Source: codyhouse.co

1. HTML

The HTML structure is quite basic: a .cd-section element is used to wrap the section content, the action button (.cd-modal-action) and the modal window (.cd-modal).

The .cd-modal-action contains the .btn button, which is used to trigger the action, and the .cd-modal-bg, which is used as modal background.  The modal content is wrapped in the .cd-modal-content element and placed inside the div.cd-modal.

<section class="cd-section">
	<!-- section content here -->
 
	<div class="cd-modal-action">
		<a href="#0" class="btn" data-type="modal-trigger">Fire Modal Window</a>
		<span class="cd-modal-bg"></span>
	</div>
 
	<div class="cd-modal">
		<div class="cd-modal-content">
			<!-- modal content here -->
		</div>
	</div>
 
	<a href="#0" class="cd-modal-close">Close</a>
</section>

.cd-modal-action {
  position: relative;
}
.cd-modal-action .btn {
  width: 12.5em;
  height: 4em;
  background-color: #123758;
  border-radius: 5em;
  transition: color 0.2s 0.3s, width 0.3s 0s;
}
.cd-modal-action .btn.to-circle {
  width: 4em;
  color: transparent;
  transition: color 0.2s 0s, width 0.3s 0.2s;
}
.cd-modal-action .cd-modal-bg {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-2em);
  width: 4em;
  height: 4em;
  background-color: #123758;
  border-radius: 50%;
  opacity: 0;
  visibility: hidden;
  transition: visibility 0s 0.5s;
}
.cd-modal-action .cd-modal-bg.is-visible {
  opacity: 1;
  visibility: visible;
}

At the end of the scale-up animation, the modal window visibility is changed (using the .modal-is-visible class) to reveal its content.

3. EVENTS HANDLING

We used jQuery to evaluate those parameters which are not accessible through CSS: the scale value assigned to the .cd-modal-bg , and its left and top position.

For example, this is how we evaluate the scale value:

var btnRadius = $('.cd-modal-bg').width()/2,
	left = $('.cd-modal-bg').offset().left + btnRadius,
	top = $('.cd-modal-bg').offset().top + btnRadius - $(window).scrollTop(),
	scale = scaleValue(top, left, btnRadius, $(window).height(), $(window).width());
 
function scaleValue( topValue, leftValue, radiusValue, windowW, windowH) {
	var maxDistHor = ( leftValue > windowW/2) ? leftValue : (windowW - leftValue),
		maxDistVert = ( topValue > windowH/2) ? topValue : (windowH - topValue);
	return Math.ceil(Math.sqrt( Math.pow(maxDistHor, 2) + Math.pow(maxDistVert, 2) )/radiusValue);
}