ChartActions.js

import Reflux from 'reflux';

const ChartActions = Reflux.createActions([
  /**
   * Sets a point to be higlighted in charts
   * @param point {Object} - the data point to be highlighted
   */
  'highlight'
]);

export default ChartActions;

ChartStore.js

import Reflux from 'reflux';
import ChartActions from '../actions/ChartActions';

const ChartStore = Reflux.createStore({
  listenables: ChartActions,

  // store the newly highlighted point and broadcast the change
  onHighlight(point) {
    this.highlight = point;
    this.update();
  },

  // broadcast the currently highlighted point
  update() {
    this.trigger({
      highlight: this.highlight
    });
  }
});

export default ChartStore;