test/dynamic-splitNumber.html

<!DOCTYPE html>
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<html>
    <head>
        <meta charset="utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1" />
        <script src="lib/simpleRequire.js"></script>
        <script src="lib/config.js"></script>
        <script src="lib/jquery.min.js"></script>
        <script src="lib/facePrint.js"></script>
        <script src="lib/testHelper.js"></script>
        <script src="lib/draggable.js"></script>
        <link rel="stylesheet" href="lib/reset.css" />
    </head>
    <body>
        <style>
            .test-title {
                background: #146402;
                color: #fff;
            }
        </style>


        <div id="main0"></div>


        <script>

            var chart;
            var myChart;
            var option;

            require([
                'echarts'/*, 'map/js/china' */
            ], function (echarts) {

                var option = {
                    xAxis: [{
                        type: 'category',
                        axisLine: { show: false },
                        axisTick: { show: false },
                        axisLabel: {
                            rotate: 45,
                            margin: 12,
                        },
                        data: ['asd','bb','cc'],
                    }],

                    yAxis: {
                        nameTextStyle: {
                        color: '#aaa',
                        },
                        nameGap: 35,
                        type: 'value',
                        axisTick: { show: false },
                        axisLine: { show: false }
                    },

                    grid: {
                        left: 40,
                        right: 10,
                        bottom: 50,
                        top: 10,
                        containLabel: true,
                        show: true,
                        borderWidth: 0,
                    },

                    series: [{
                        type: 'bar',
                        data: [
                            12, 44, 53
                        ]
                    }]
                };

                var chart = testHelper.create(echarts, 'main0', {
                    title: 'drag and minimize y, check dynamic splitNumber',
                    option: option
                });

                draggable.init(
                    document.querySelector('#main0 .test-chart'),
                    chart,
                    {throttle: 70, onDrag: onDrag}
                );

                function onDrag() {
                    var height = chart.getHeight();
                    var splitNumber = height < 200
                        ? 2
                        : height < 300
                        ? 4
                        : null;
                    console.log(height, splitNumber);
                    chart.setOption({
                        yAxis: {splitNumber: splitNumber}
                    });
                    chart.resize();
                }
            });

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