PFold: Paper-Like Unfolding Effect

From our sponsor: Market smarter with Mailchimp's automated messaging tools.

PFold is a very experimental jQuery plugin that makes it possible to open elements in a paper-like unfolding effect. An element can be unfolded in 3D in order to reveal some other content. The idea is to have several levels of folding, where each step of opening will double the element size, hence imitating a folded paper being opened.

A couple of options are available, such as the unfolding direction for each step and the number of folding steps.

For browsers that don’t support CSS 3D transforms or transitions, there will be a simple fallback, i.e. the larger content appears.

For using the plugin, the following structure is expected:

<div id="uc-container" class="uc-container">
	<div class="uc-initial-content">
		<!-- initial content -->
	</div>
	<div class="uc-final-content">
		<!-- final content -->
	</div>
</div>

The final content’s size will depend on the initial content’s size (set in the CSS), the folding directions and the number of folding steps. For example, having an initial element of 200px width and height, a folding direction of bottom and left and two folding steps will create a final area of 400px in width and height.

The plugin can be called like this:

$( '#uc-container' ).pfold();

Options

The following options are available:

// the options
$.PFold.defaults = {
	// perspective value
	perspective : 1200,

	// each folding step's speed
	speed : 450,

	// each folding step's easing 
	easing : 'linear',

	// delay between each (un)folding step (ms)
	folddelay : 0,

	// number of times the element will fold
	folds : 2,

	// the direction of each unfolding step
	folddirection : ['right','top'],

	// use overlays to simulate a shadow for each folding step 
	overlays : true,

	// the main container moves (translation) in order to keep its initial position 
	centered : false,

	// allows us to specify a different speed for the container's translation
	// values range : [0 - 1] 
	// if 0 the container jumps immediately to the final position (translation).
	// this is only valid if centered is true
	containerSpeedFactor : 1,

	// easing for the container transition
	// this is only valid if centered is true
	containerEasing : 'linear',

	// callbacks
	onEndFolding : function() { return false; },
	onEndUnfolding : function() { return false; }
};

Check out the three demos with different configurations:

• Demo 1: Three folding steps with the directions left, bottom and right
• Demo 2: Two folding steps with different directions of folding according to the grid position
• Demo 3: Same as demo 2, item will be centered on its original position