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Using tasks that perform on property update
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| // Mixin | |
| import { task } from 'ember-concurrency'; | |
| import Mixin from '@ember/object/mixin'; | |
| export default Mixin.create({ | |
| computedTask(keyToWatch, genFunc) { | |
| // Maybe check if this wasn't previously set up | |
| // Ready the task | |
| Ember.defineProperty(this, 'taskToRun', task(genFunc).restartable()); | |
| // Add the observer that performs the task on value update | |
| this.addObserver(keyToWatch, () => { | |
| this.taskToRun.perform(); | |
| }); | |
| // Run the first time | |
| this.taskToRun.perform(); | |
| } | |
| }); |
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| import ComputedTask from 'computed-tasks/mixins/my-comp-task'; | |
| import { timeout } from 'ember-concurrency'; | |
| import { later } from '@ember/runloop'; | |
| import Component from '@ember/component'; | |
| export default Component.extend(ComputedTask, { | |
| mSetupComputedTaskExample() { | |
| this.computedTask('foo', function * () { | |
| yield timeout(1000); | |
| let randomVal = Math.random(); | |
| let fooVal = this.get('foo'); | |
| this.set('newFoo', `fooVal = ${fooVal}, randomVal = ${randomVal}`); | |
| }); | |
| }, | |
| didInsertElement() { | |
| // Initial value | |
| this.set('foo', 'Physics'); | |
| this.mSetupComputedTaskExample(); | |
| // To see it in action | |
| later(this, function(){ | |
| this.set('foo', 'Biology'); | |
| }, 2000); | |
| } | |
| }); |
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