discourse/app/assets/javascripts/admin/addon/components/value-list.hbs

{{#if this.collection}}
  <div class="values">
    {{#each this.collection as |value index|}}
      <div data-index={{index}} class="value">
        <DButton
          @action={{action "removeValue"}}
          @actionParam={{value}}
          @icon="times"
          @class="remove-value-btn btn-small"
        />

        <Input
          title={{value}}
          @value={{value}}
          class="value-input"
          {{on "focusout" (fn (action "changeValue") index)}}
        />

        {{#if this.showUpDownButtons}}
          <DButton
            @action={{action "shift" -1 index}}
            @icon="arrow-up"
            @class="shift-up-value-btn btn-small"
          />
          <DButton
            @action={{action "shift" 1 index}}
            @icon="arrow-down"
            @class="shift-down-value-btn btn-small"
          />
        {{/if}}
      </div>
    {{/each}}
  </div>
{{/if}}

<ComboBox
  @valueProperty={{null}}
  @nameProperty={{null}}
  @value={{this.newValue}}
  @content={{this.filteredChoices}}
  @onChange={{action "selectChoice"}}
  @options={{hash allowAny=true none=this.noneKey}}
/>