test/lines-mergeOption.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/facePrint.js"></script>
        <script src="lib/testHelper.js"></script>
        <link rel="stylesheet" href="lib/reset.css" />
    </head>
    <body>
        <style>
            .test-title {
                background: #146402;
                color: #fff;
            }
        </style>


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

        <script>

            // See <https://github.com/apache/incubator-echarts/issues/12836>

            var chart;
            var myChart;
            var option;

            require([
                'echarts'
            ], function (echarts) {
                option = {
                    xAxis: {
                        type: 'category',
                        data: ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
                    },
                    yAxis: [
                        {
                            scale: true,
                        },
                    ],
                    series: [
                        {
                            data: [1320, 1800],
                            type: 'line'
                        },
                        {
                            type: 'lines',
                            coordinateSystem: 'cartesian2d',
                            data: [{
                                coords: [
                                    ['Tue', 1500],
                                    ['Thu', 1800]
                                ]
                            }, {
                                coords: [
                                    ['Fri', 1600],
                                    ['Sat', 1400]
                                ]
                            }]
                        }
                    ]
                };

                chart = myChart = testHelper.create(echarts, 'main0', {
                    title: ['lines series should not disappear after `chart.setOption({})`'],
                    option: option,
                    info: option,
                    button: {
                        text: 'Click to setOption({})',
                        onClick: function () {
                            myChart.setOption({});
                        }
                    }
                });
            });

        </script>

    </body>
</html>