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<html>
    <head>
        <meta charset="utf-8">
        <script src="lib/esl.js"></script>
        <script src="lib/config.js"></script>
        <link rel="stylesheet" href="lib/reset.css" />
    </head>
    <body>
        <style>
            #chart1, #chart2 {
                width: 50%;
                height: 500px;
                float: left;
            }
    </style>
        (1) hover on chart1: should no error.
        (2) <button onclick="loadChart2();">Load chart2</button>
        (3) hover on chart1 and chart2: should no error.

        <div>
            <div class="chart" id="chart1"></div>
            <div class="chart" id="chart2"></div>
        </div>
        <script>


            require([
                'echarts'
                // 'echarts/chart/scatter',
                // 'echarts/component/legend',
                // 'echarts/component/grid',
                // 'echarts/component/visualMap',
                // 'echarts/component/tooltip'
            ], function (echarts) {

                var chart1 = echarts.init(document.getElementById('chart1'));
                var chart2 = echarts.init(document.getElementById('chart2'));

                echarts.connect([chart1, chart2]);

                var data1 = [];

                var symbolCount = 6;

                for (var i = 0; i < 100; i++) {
                    data1.push([
                        Math.random() * 5,
                        Math.random() * 4,
                        Math.random() * 20,
                        Math.round(Math.random() * (symbolCount - 1))
                    ]);
                }

                chart1.setOption({
                    legend: {
                        top: 50,
                        data: ['scatter']
                    },
                    tooltip: {
                        formatter: '{c}'
                    },
                    grid: {
                        top: '26%',
                        bottom: '26%'
                    },
                    xAxis: {
                        type: 'value',
                        splitLine: {
                            show: false
                        }
                    },
                    yAxis: {
                        type: 'value',
                        splitLine: {
                            show: false
                        }
                    },
                    visualMap: [
                        {
                            realtime: false,
                            left: 'right',
                            orient: 'horizontal',
                            // selectedMode: 'single',
                            selectedMode: 'multiple',
                            backgroundColor: '#eee',
                            dimension: 2,
                            selected: [],
                            min: 0,
                            max: 24,
                            precision: 0,
                            splitNumber: 0,
                            calculable: true,
                            inRange: { // visual for short cut
                                color: ['#006edd', '#e0ffff']
                            }
                        }
                    ],
                    series: [
                        {
                            name: 'scatter',
                            type: 'scatter',
                            symbolSize: 30,
                            data: data1
                        }
                    ]
                });


                window.loadChart2 = function () {
                    chart2.setOption({
                        legend: {
                            top: 50,
                            data: ['scatter']
                        },
                        tooltip: {
                            formatter: '{c}'
                        },
                        grid: {
                            top: '26%',
                            bottom: '26%'
                        },
                        xAxis: {
                            type: 'value',
                            splitLine: {
                                show: false
                            }
                        },
                        yAxis: {
                            type: 'value',
                            splitLine: {
                                show: false
                            }
                        },
                        visualMap: [
                            {
                                left: 'right',
                                // selectedMode: 'single',
                                selectedMode: 'multiple',
                                orient: 'horizontal',
                                backgroundColor: '#eee',
                                dimension: 2,
                                selected: [],
                                min: 0,
                                max: 24,
                                precision: 0,
                                splitNumber: 0,
                                calculable: true,
                                inRange: { // visual for short cut
                                    color: ['#006edd', '#e0ffff']
                                }
                            }
                        ],
                        series: [
                            {
                                name: 'scatter',
                                type: 'scatter',
                                symbolSize: 30,
                                data: data1
                            }
                        ]
                    });
                }


            });

        </script>
    </body>
</html>