ember-idle-scheduler

Simple promise wrap around requestIdleCallback and a promise (priority) queue.

--

For more complex logic consider using skyrocket (https://github.com/runspired/skyrocket) and/or igniter (https://github.com/runspired/igniter)

The problem

Simply calling requestIdleCallback from different places in the code can cause that all these callbacks are fired within one same idle frame. This can cause jank, or delay time to interactivity. Calling requestIdleCallback within previous requestIdleCallback ensures that the next logic is executed in next idle frame. But this is not always feasible.

The queue

Wrapping requestIdleCallback in a promise and adding those promises in a promise queue ensures that that different idle frame is received on each call.

Simply inject a service and add a callback to the queue.

  idle: inject.service(),

  _setFoo() {
    this.get('idle').schedule(100).then(() => {
      this.set('foo', this.get('_value'));
    });
  }

requestIdleCallback can be used to delay non essential logic to lower the time to interactivity. Non essential logic can be used for firing up analytics, including external scripts (that are not being used in the current route) or loading content in advance.

In this example, google analytics script is included in first idle frame and a track request is fired in next one.

  getGA(){
    return this.get('idle').schedule(1000).then(() => {
      return $.getScript('https://www.google-analytics.com/analytics.js');
    }).then(() => {
      let gaTrackingId = this.get('gaTrackingId');
      window.ga('create', gaTrackingId, 'auto');
    });
  },

  googleAnalytics: computed(function(){
    return this.getGA();
  }),

  track(cb){
    if(this.get('gaTrackingId')){
      return this.get('googleAnalytics').then(() => {
        return this.get('idle').schedule(1000);
      }).then(cb);
    }
  },

  trackPage(page, title){
    this.track(() => {   
      window.ga('send', {
        hitType: 'pageview',
        page,
        title
      });
    });
  }

Installation

• git clone <repository-url> this repository
• cd ember-idle-scheduler
• npm install

Running

• ember serve
• Visit your app at http://localhost:4200.

Running Tests

• npm test (Runs ember try:each to test your addon against multiple Ember versions)
• ember test
• ember test --server

Building

• ember build

For more information on using ember-cli, visit https://ember-cli.com/.