src/component/legend/legendFilter.ts

import SeriesModel from '../../model/Series';
import GlobalModel from '../../model/Global';
import LegendModel from './LegendModel';

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements.  See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership.  The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License.  You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied.  See the License for the
* specific language governing permissions and limitations
* under the License.
*/

export default function legendFilter(ecModel: GlobalModel) {

    const legendModels = ecModel.findComponents({
        mainType: 'legend'
    }) as LegendModel[];
    if (legendModels && legendModels.length) {
        ecModel.filterSeries(function (series: SeriesModel) {
            // If in any legend component the status is not selected.
            // Because in legend series is assumed selected when it is not in the legend data.
            for (let i = 0; i < legendModels.length; i++) {
                if (!legendModels[i].isSelected(series.name)) {
                    return false;
                }
            }
            return true;
        });
    }

}