Transition between CSS states, no matter how they are positioned!

No dependencies, only 1.3Kb when minified! Uses CSS animations.

$ npm install welderjs

Bower

$ bower install welderjs

// Include the library
<script src="js/welder.js" charset="utf-8"></script>

// Initialize the library with options
var globalOpts = {
  duration: 400
}
welder.init(globalOpts);

// Transition an element to a new state
var el = document.querySelector('#weldMe');
welder.transition(el, 'newState', options);

This library can transition elements between CSS states by simply switching a data attribute. By default, welder uses data-state, but this is configurable. After initializing the library, simply call weld.transition(...) and give it the string of the new state to transition to this state.

Both upon initializing and requesting a transition, welder can be configured as follows. If an option is not given upon requesting a transition, either the default value or the value set upon initializing will be used.

var globalOpts = {
  delay: 50,                   // Delay in ms before transition occurs. Default (recommended): 50
  duration: 400,               // Duration of transition in ms. Default: 400
  easing: 'ease-out',          // CSS transition easing. Default: 'ease-out'
  dataAttribute: 'data-state'  // The attribute used to switch between states. Default: 'data-state'
}
welder.init(globalOpts);

/* ... */

var el = document.querySelector('#weldMe');

var opts = {
  delay: 50,                    // Delay in ms before transition occurs. Default (recommended): 50
  duration: 400,                // Duration of transition in ms. Default: 400
  easing: 'ease-out',           // CSS transition easing. Default: 'ease-out'
  dataAttribute: 'data-state',  // The attribute used to switch between states. Default: 'data-state'
  relativeTo: document.querySelector('...')   // The reference for the transition (see below). Default: null
}

welder.transition(el, 'newState', opts);

When you set the relativeTo option to anything other than an empty string (it's default value), welder will use the corresponding node instead of the viewport as the point of reference for the transition. This is particularly handy when scrolling might occur while the transition is playing.

The way it works is that the transition element will have absolute positioning instead of the default fixed positioning. Please keep in mind that for this to work, the reference (preferably the parent node) has relative, absolute or fixed positioning.

Feeling inspired? Please contribute! Currently in need of demos and testing.

• Testing
• Ability to transition between states using classes

MIT License © Yarmo Mackenbach