ember-modifier-manager-polyfill

This addon provides a polyfill for implementing element modifier managers as described in emberjs/rfcs#373.

Compatibility

• Completely inert when running ember-source 3.8 or higher
• Tested against ember-source v2.12, v2.16, v2.18, v3.4, v3.5, v3.6, v3.7 in CI

Installation

ember install ember-modifier-manager-polyfill

Usage

At this point the best documentation is likely still the the RFC itself, but here are a few simple examples (shamelessly stolen from another modifier RFC emberjs/rfcs#353):

Performance Marking

<section id="about-us" {{performance 'mark' 'about-page'}}>
  <h1>About Us</h1>
  {{!-- snip --}}
</section>

// app/modifiers/performance.js
import Ember from 'ember';
 
export default Ember._setModifierManager(
  () => ({
    createModifier() {},
 
    installModifier(_instance, _element, args) {
      let [type, name] = args.positional;
 
      performance[type](name);
    },
 
    updateModifier() {},
    destroyModifier() {},
  }),
  class PerformanceModifier {}
);

jQuery Widget

<input type="date" {{datepicker changeMonth=true changeYear=true}} />

// app/modifiers/datepicker.js
import Ember from 'ember';
import $ from 'jquery';
 
export default Ember._setModifierManager(
  () => ({
    createModifier() {
      return { element: null };
    },
 
    installModifier(state, element, args) {
      let options = Object.assign({ minDate: 20, maxDate: '+1M +10D' }, args.named);
 
      // setup state bucket for use in destroyModifier
      state.element = element;
      state.options = options;
 
      $(this.element).datepicker(options);
    },
 
    updateModifier() {},
    destroyModifier(state) {
      $(state.element).datepicker(state.options);
    },
  }),
  class DatepickerModifier {}
);

Page View Tracking

<section {{track-impression eventCategory="Post"}}>
  <header>Chad liked a post</header>
  <img src="cat.jpg">
  {{!-- Snip --}}
<section>

// app/modifiers/track-impression.js
import Ember from 'ember';
 
export default Ember._setModifierManager(
  owner => ({
    createModifier() {
      return { element: null, observer: null };
    },
 
    installModifier(state, element, args) {
      let ga = owner.lookup('service:ga');
      let { eventCategory } = args.named;
 
      let interSectionObserver = new IntersectionObserver(entries => {
        entries.forEach(entry => ga.send('event', 'impression', eventCategory));
      });
 
      // setup state bucket for use in destroyModifier
      state.element = element;
      state.observer = interSectionObserver;
    },
 
    updateModifier() {},
    destroyModifier(state) {
     state.observer.unobserve(state.element);
    },
  }),
  class TrackImpressionModifier {}
);

License

This project is licensed under the MIT License.