zh/builder/src/echarts3/component/legend/scrollableLegendAction.js

import * as echarts from '../../echarts';
/**
 * @event legendScroll
 * @type {Object}
 * @property {string} type 'legendScroll'
 * @property {string} scrollDataIndex
 */

echarts.registerAction('legendScroll', 'legendscroll', function (payload, ecModel) {
  var scrollDataIndex = payload.scrollDataIndex;
  scrollDataIndex != null && ecModel.eachComponent({
    mainType: 'legend',
    subType: 'scroll',
    query: payload
  }, function (legendModel) {
    legendModel.setScrollDataIndex(scrollDataIndex);
  });
});