Doormat 👞👡

an alternative way to traverse through your site content 😎

Index

How

The trick is possible by making sections of the page position: fixed and position: absolute whilst setting a height for the container element equal to the combined height of the page sections.

Page sections are given an appropriate top value that gives some buffer space for scrolling and give the parallax like illusion against whichever section is currently position: fixed.

Dependent on the panel mode, as the window is scrolled panels come into or move out of the viewport to either reveal or cover up fixed position content.

Features

Provides alternative way to traverse content
Configurable behavior
Inbound and outbound traversal modes
Panel snapping to either viewport or as a means of traversing panels
API for programmatically traversing content
Responsive
Animated scrolling
Simple to create custom effects/behavior with CSS with many possibilities.
Supports overflowing content in outbound mode(refer to caveats😅)
No dependencies! 🎉
Scroll/Resize optimization via requestAnimationFrame

Browser support

Chrome	Firefox	Safari	Opera	Edge	IE
😄	😄	😄	😄	😄	😄

v5 makes use of requestAnimationFrame, viewport units and the Event API. Most browsers should play nice except Opera Mini 👎. IE support should be fine in version 11.

Usage

To create your doormat.

Include doormat{.min}.js and doormat{.min}.css in your page/bundle.
Create your DOM/Page structure. The containing element needs the classname dm. This could be body. doormat uses panels for each section of content. Therefore, the children of our container need the class dm-pnl. ol and ul make good container elements 😉 A structure like the following is ideal.

  <body>
    <ol class="dm">
      <li class="dm__pnl">Awesome</li>
      <li class="dm__pnl">Site</li>
      <li class="dm__pnl">Content</li>
    </ol>
    <script src="doormat.min.js"/>
  </body>

Invoke the Doormat function passing in desired options(explained below) as a parameter;

document.addEventListener('DOMContentLoaded', function() {
  var myDoormat = new Doormat();
});

Options

{number} snapDebounce - defaults to 150: No need to trigger snapping behavior on every scroll so snapDebounce defines a debouncing duration in ms.
{number} scrollDuration - defaults to 250: Defines the default duration in ms that a panel takes to snap to place or the duration of a programmatic doormat scroll that isn't overridden with the optional parameter.
{string} snapMode - defaults to 'viewport': Defines the "snap" style of Doormat panels. Whether it be viewport style, travel style or disabled with false. Setting to false will mean that users can scroll content so that it doesn't sit flush in the viewport.
{string} mode - defaults to 'outbound': Defines the traversal style. outbound will make panels slide out to the top of the viewport revealing content underneath. inbound will make panels slide in from the bottom covering content.
{number} snapThreshold - defaults to 30: Define the percentage of the viewport that will trigger a "snap". For example, you start scrolling a panel but no more than 30% of the viewport height. You stop scrolling and because snapMode is set to viewport, the panel scrolls back to fit flush with the viewport again 👍

API

{number} activeIndex: Getter for current active panel index. Useful for conditionals where content should only appear at certain times etc.
{Object} active: Getter for current active panel element.
next: Function to scroll to next panel.
prev: Function to scroll to previous panel.
{Array} panels: Getter for panels collection.
reset: Function to reset Doormat instance. Used on viewport changes. Will instantly scroll to top with no animation and set first panel as active.
{number} scrollPos: Getter for current scroll position of instance.
scrollTo({number} scrollPosition, ?{number} speed): Function for scrolling to a specific position within instance. Accepts optional speed parameter in ms.
scrollToPanel({number} panelIndex, ?{number} speed): Function for scrolling to a specific panel. Accepts optional speed parameter in ms.

Events

Doormat offers an even that can be bound to for observing when a new panel becomes active. The event is doormat:update. Consider the following example that can be used for customisation to show controls once scrolled past the first panel 😎

window.addEventListener('doormat:update', (e) => {
  if (doormatInstance.activeIndex > 1)
    document.body.classList.add('show-controls')
  else
    document.body.classList.remove('show-controls')
})

curtain.js?

Unfortunately, curtain.js is no longer maintained and there were reports of issues with newer versions of jQuery.

curtain.js is a more feature rich solution and provides some different behavior and hooks. It does however depend on jQuery.

I was unaware of curtain.js when creating Doormat. Initially, I was experimenting with different implementations of parallax style effects and messing about with viewport units.

My aim with Doormat was to create the effect but keep the solution minimal with no dependencies. It was a result of curiosity and playing with code.

Customisation

UI Effects

One feature I like with Doormat is the ability to create custom effects with relative ease using CSS or conditionally based on the current active panel index of a Doormat instance.

For example, the effects in the above GIF are created by leveraging CSS transitions based on the current active panel of an instance. The important parts are;

.dm-panel__content {
  opacity: 0;
  transform: scale(0);
  transition: opacity .25s ease 0s, transform .25s ease 0s;
}

.dm-panel--active .dm-panel__content {
  opacity: 1;
  transform: scale(1);
}

Caveats

If you use inbound mode, content larger than the viewport will get cut off as opposed to when using outbound mode. Solution? Make the content of the active panel scrollable 🤓

  .dm-panel--active .dm-panel__content {
    overflow: auto;
  }

Roll your own classes

The classes for Doormat are config driven with doormat.config.json. In here you can alter the classnames for elements to your desire.

Important:: If you change the classnames in the config, you will also need to update any reference to them from within the JavaScript source. For example, by altering the classes property on the Doormat class.

Change the config and then run the build task with make build.

Development

Want to play with the code?

Fork and clone or simply clone the repo direct.

 git clone https://github.com/jh3y/doormat.git

Navigate into the repo and run the setup task;
```
 cd doormat
 make setup
```
Run the develop task to get up and running with browser-sync etc.
```
 make develop
```

NOTE:: See all available build tasks by simply running make in the root of the directory 👍

  make

Contributing

Don't hesitate to post an issue or suggestion or get in touch by tweeting me @_jh3y!

License

MIT

jh3y 2017

Images courtesy of Unsplash 🐱

jh3y/doormat

jh3y

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