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fastdom-sequencer

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fastdom-sequencer

A [`fastdom`](http://github.com/wilsonpage/fastdom) extension that prioritises tasks and executes them in 'sequence' for the best possible render performance.

  • 1.0.3
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fastdom-sequencer

A fastdom extension that prioritises tasks and executes them in 'sequence' for the best possible render performance.

  • User interactions are 'protected' from tasks that cause jank
  • Animations/transitions are 'protected' from DOM measurements and mutations that cause jank
  • Clean Promise based API

Usage

var sequencer = require('fastdom-sequencer')

or

<script src="node_modules/fastdom/fastdom.js"></script>
<script src="node_modules/fastdom-sequencer/fastdom-sequencer.js"></script>

API

sequencer#on()

Binds a high-priority interaction that defers any .animate() or .mutate() task that are executed elsewhere in the app. This protects any interaction related UI changes from jank.

sequencer.on(element, 'scroll', function(e) {
  sequencer.mutate(...);
});
sequencer.on(element, 'click', function(e) {
  return sequencer.animate(function() {
    element.classList.add('grow');
    return element;
  });
});
sequencer.on(element, 'click', function(e) {
  return sequencer
    .animate(() => {
      element.classList.add('grow');
      return element;
    })

    .animate(() => {
      element.classList.add('shrink');
      return element;
    })
});
sequencer.off(element, 'click', callback);
  • .animate() or .mutate() tasks inside the .interaction() callbacks are run instantly and not deferred.

sequencer#animate()

Should contain any animation/transition code and return the target element.

sequencer
  .animate(() => {
    element.style.transform = 'translateY(100%)');
    return element;
  })

  .then(() => {
    // transition/animation end
  });
  • Is deferred by any incomplete .on() interactions
  • Run instantly if no .on() interactions are happening
  • Internally run inside sequencer.mutate() as DOM changes will be required to trigger animation

sequencer#mutate()

Should contain any code that is likely to cause document reflow/layout.

sequencer.mutate(() => {
  var li = document.createElement('li');
  list.appendChild(li);
});
  • Is deferred by any incomplete .interactions()
  • Run instantly if no .interactions() are happening
  • Internally run inside sequencer.mutate() as DOM changes will be required to trigger animation

Chaining

Tasks can be chained together so that they happen sequentially.

sequencer
  .measure(() => list.clientHeight)
  .mutate(height => list.appendChild(item))
  .animate(() => {
    item.classList.add('reveal');
    return item;
  })

  .then(() => {
    console.log('all done!');
  });

FAQs

Package last updated on 15 Feb 2016

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