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ember-render-helpers

CI npm version Download Total Ember Observer Score Ember Versions ember-cli Versions code style: prettier dependencies devDependencies

@ember/render-modifiers as template helpers: {{did-insert}}, {{did-update}}, {{will-destroy}}

The original idea came from this Pre-RFC.

Installation

ember install ember-render-helpers

Usage

Example

Clicking the Toggle button will toggle the isVisible flag. When it switches to true, onDidInsert will be called, because the {{did-insert}} helper is inserted. When it switches to false, onWillDestroy will be called, because the {{will-destroy}} helper is removed.

Clicking the Random button will set randomValue to a new random value. Every time this happens, while isVisible is true, onDidUpdate will be called, because one of the parameters passed to the {{did-update}} helper was updated.

Clicking the Random button does not cause {{did-insert}} or {{will-destroy}} to call onDidInsert and onWillDestroy, since these helpers are not triggered by parameter updates.

{{#if this.isVisible}}
  {{did-insert   this.onDidInsert   1 2 3 this.randomValue foo="bar" qux="baz"}}
  {{will-destroy this.onWillDestroy 1 2 3 this.randomValue foo="bar" qux="baz"}}
  {{did-update   this.onDidUpdate   1 2 3 this.randomValue foo="bar" qux="baz"}}
{{/if}}

<button {{on "click" this.toggleVisibility}}>Toggle</button>
<button {{on "click" this.rollTheDice}}>Random</button>
import { action } from '@ember/object';
import Component from '@glimmer/component';
import { tracked } from '@glimmer/tracking';

export default class extends Component {
  @tracked isVisible = false;

  @tracked randomValue?: number;

  @action
  toggleVisibility() {
    this.isVisible = !this.isVisible;
  }

  @action
  rollTheDice() {
    this.randomValue = Math.random();
  }

  @action
  onDidInsert(positional: unknown[], named: Record<string, unknown>) {
    console.log({ positional, named });
    // => { positional: [1, 2, 3, 0.1337...], named: { foo: 'bar', qux: 'baz' } }
  }

  @action
  onWillDestroy(positional: unknown[], named: Record<string, unknown>) {
    console.log({ positional, named });
    // => { positional: [1, 2, 3, 0.1337...], named: { foo: 'bar', qux: 'baz' } }
  }

  @action
  onDidUpdate(positional: unknown[], named: Record<string, unknown>) {
    console.log({ positional, named });
    // => { positional: [1, 2, 3, 0.1337...], named: { foo: 'bar', qux: 'baz' } }
  }
}