framework/js/lib/components/select-input.js

import Component from 'flarum/component'
import icon from 'flarum/helpers/icon';

export default class SelectInput extends Component {
  view(ctrl) {
    return m('span.select-input', [
      m('select.form-control', {onchange: m.withAttr('value', this.props.onchange.bind(ctrl)), value: this.props.value}, [
        Object.keys(this.props.options).map(key => m('option', {value: key}, this.props.options[key]))
      ]),
      icon('sort')
    ])
  }
}