Repeatable Fields

components.close-button.js

import Ember from 'ember';

export default Ember.Component.extend({
	tagName: 'button',
  click() {
    let action = this.get('action');
    
    if (typeof action === 'function') {
    	action();
    }
  }
});

components.repeatable-field.js

import Ember from 'ember';

export default Ember.Component.extend({
  init() {
    this._super(...arguments);
    
    this.set('components', Ember.A([Ember.Object.create({value: ''})]));
  },
  
  didReceiveAttrs() {
    this._super(...arguments);
    this.set('maxRepeats', Math.max(1, parseInt(this.get('max-repeats'), 10)) || 5);
    
    this.set('minRepeats', Math.max(1, parseInt(this.get('min-repeats'), 10)) || 2);
  },
  
  addElementIfNeeded() {
    console.log(this.get('components.length'), this.get('maxRepeats'), this.get('components.lastObject.value'));
    if (this.get('components.length') < this.get('maxRepeats') &&
        Ember.isPresent(this.get('components.lastObject.value'))) {
      this.get('components').pushObject(Ember.Object.create({value:''}));
    }
  },
  
  actions: {
    removeRepetition(idx) {
      this.get('components').removeAt(idx, 1);
      this.addElementIfNeeded();
    },
  	onInput(idx, value) {
      
    },
    onChange(idx, value) {
      this.get('components')
          .objectAt(idx)
      		.set('value', value);
      this.get('onchange')(this.get('components'), idx, value);
      
      this.addElementIfNeeded();
    }
  }
});

components.text-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  init() {
    this._super(...arguments);
    this.set('value', '');
  },
  actions: {
    onInput(value) {
      this.get('oninput')(value);
    },
    onChange(value) {
      this.get('onchange')(value);
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  actions: {
    repeatableFieldChanged() { }
  }
});

helpers.arr.js

import Ember from 'ember';

export function arr(params=[]/*, hash*/) {
  return params.slice(0);
}

export default Ember.Helper.helper(arr);

helpers.is-deletable.js

import Ember from 'ember';

export function isDeletable([value, idx]/*, hash*/) {
  return Ember.isPresent(value) && idx > 0;
}

export default Ember.Helper.helper(isDeletable);

helpers.is-extra-field.js

import Ember from 'ember';

export function isExtraField([idx]/*, hash*/) {
  return idx > 0;
}

export default Ember.Helper.helper(isExtraField);

helpers.is-main-field.js

import Ember from 'ember';

export function isMainField([idx]/*, hash*/) {
  return idx === 0;
}

export default Ember.Helper.helper(isMainField);

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

input:required {
  border-color: red;
}

templates.application.hbs

<h2> A repeatable text field </h2>

{{repeatable-field
	field=(component "text-component")
  max-repeats=maxRepeats
  min-repeats=minRepeats
  onchange=(action "repeatableFieldChanged")}}
<div>

</div>


<br>
<br>

templates.components.close-button.hbs

X

templates.components.repeatable-field.hbs

<h3> Some fieldsets </h3>
{{#each components as |comp idx|}}
  {{component field value=(readonly comp.value)
    oninput=(action "onInput" idx)
    onchange=(action "onChange" idx)
    required=(is-main-field idx)
    afterComponents=(if (is-deletable comp.value idx) (arr (component "close-button" action=(action "removeRepetition" idx))) (arr))
   }} ({{comp.value}})
{{/each}}

<h3> Values </h3>

<ol>
{{#each components as |comp idx|}}
  <li>{{comp.value}}</li>
{{/each}}
</ol>

templates.components.text-component.hbs

<input value={{value}}
       oninput={{action "onInput" value="target.value"}}
       onchange={{action "onChange" value="target.value"}}
       required={{required}}>
       
{{#if afterComponents}}
|
{{/if}}
{{#each afterComponents as |comp|}}
	{{component comp}}
{{/each}}

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0-beta.4",
    "ember-template-compiler": "2.9.0-beta.4"
  },
  "addons": {}
}