echarts 如何保持显示 y轴的竖线？不因 移出图表 而消失

Question

如图，现在有需求，就是显示当前选中的这条线不消失，一直显示。现在的情况是，当鼠标移出当前表区域后，该线条就消失了。

Answer 1

Echarts 貌似没这样的配置项。

我写了个另类的方法可以试试

// 鼠标退出
myChart.on('mouseout', function (params) {
    setBrush(params.name)
});

// 设置竖线
function setBrush(focus) {
    myChart.dispatchAction({
        type: 'brush',
        areas: [
            {
                brushType: 'lineX',
                coordRange: [focus, focus],
                xAxisIndex: 0
            }
        ]
    });
}

完整实例代码：

var upColor = '#00da3c';
var downColor = '#ec0000';


function splitData(rawData) {
    var categoryData = [];
    var values = [];
    var volumes = [];
    for (var i = 0; i < rawData.length; i++) {
        categoryData.push(rawData[i].splice(0, 1)[0]);
        values.push(rawData[i]);
        volumes.push([i, rawData[i][4], rawData[i][0] > rawData[i][1] ? 1 : -1]);
    }

    return {
        categoryData: categoryData,
        values: values,
        volumes: volumes
    };
}

function calculateMA(dayCount, data) {
    var result = [];
    for (var i = 0, len = data.values.length; i < len; i++) {
        if (i < dayCount) {
            result.push('-');
            continue;
        }
        var sum = 0;
        for (var j = 0; j < dayCount; j++) {
            sum += data.values[i - j][1];
        }
        result.push(+(sum / dayCount).toFixed(3));
    }
    return result;
}

$.get('data/asset/data/stock-DJI.json', function (rawData) {

    var data = splitData(rawData);

    myChart.setOption(option = {
        backgroundColor: '#fff',
        animation: false,
        legend: {
            bottom: 10,
            left: 'center',
            data: ['Dow-Jones index', 'MA5', 'MA10', 'MA20', 'MA30']
        },
        tooltip: {
            trigger: 'axis',
         
           // backgroundColor: 'rgba(245, 245, 245, 0.8)',
            borderWidth: 1,
            borderColor: '#ccc',
            padding: 10,
            textStyle: {
                color: '#000'
            },
         
            // extraCssText: 'width: 170px'
        },
        axisPointer: {
            link: {xAxisIndex: 'all'},
            label: {
                backgroundColor: '#777'
            }
        },
        toolbox: {
            feature: {
                dataZoom: {
                    yAxisIndex: false
                },
                brush: {
                    type: ['lineX', 'clear']
                }
            }
        },
        brush: {
            xAxisIndex: 'all',
            brushLink: 'all',
            outOfBrush: {
                colorAlpha: 1
            }
        },
        visualMap: {
            show: false,
            seriesIndex: 5,
            dimension: 2,
            pieces: [{
                value: 1,
                color: downColor
            }, {
                value: -1,
                color: upColor
            }]
        },
        grid: [
            {
                left: '10%',
                right: '8%',
                height: '50%'
            },
            {
                left: '10%',
                right: '8%',
                top: '63%',
                height: '16%'
            }
        ],
        xAxis: [
            {
                type: 'category',
                data: data.categoryData,
                scale: true,
                boundaryGap : false,
                axisLine: {onZero: false},
                splitLine: {show: false},
                splitNumber: 20,
                min: 'dataMin',
                max: 'dataMax',
                axisPointer: {
                    z: 100
                }
            },
            {
                type: 'category',
                gridIndex: 1,
                data: data.categoryData,
                scale: true,
                boundaryGap : false,
                axisLine: {onZero: false},
                axisTick: {show: false},
                splitLine: {show: false},
                axisLabel: {show: false},
                splitNumber: 20,
                min: 'dataMin',
                max: 'dataMax'
                // axisPointer: {
                //     label: {
                //         formatter: function (params) {
                //             var seriesValue = (params.seriesData[0] || {}).value;
                //             return params.value
                //             + (seriesValue != null
                //                 ? '\n' + echarts.format.addCommas(seriesValue)
                //                 : ''
                //             );
                //         }
                //     }
                // }
            }
        ],
        yAxis: [
            {
                scale: true,
                splitArea: {
                    show: true
                }
            },
            {
                scale: true,
                gridIndex: 1,
                splitNumber: 2,
                axisLabel: {show: false},
                axisLine: {show: false},
                axisTick: {show: false},
                splitLine: {show: false}
            }
        ],
        dataZoom: [
            {
                type: 'inside',
                xAxisIndex: [0, 1],
                start: 98,
                end: 100
            },
            {
                show: true,
                xAxisIndex: [0, 1],
                type: 'slider',
                top: '85%',
                start: 98,
                end: 100
            }
        ],
        series: [
            {
                name: 'Dow-Jones index',
                type: 'candlestick',
                data: data.values,
                itemStyle: {
                    normal: {
                        color: upColor,
                        color0: downColor,
                        borderColor: null,
                        borderColor0: null
                    }
                },
         
            },
            {
                name: 'MA5',
                type: 'line',
                data: calculateMA(5, data),
                smooth: true,
                lineStyle: {
                    normal: {opacity: 0.5}
                }
            },
            {
                name: 'MA10',
                type: 'line',
                data: calculateMA(10, data),
                smooth: true,
                lineStyle: {
                    normal: {opacity: 0.5}
                }
            },
            {
                name: 'MA20',
                type: 'line',
                data: calculateMA(20, data),
                smooth: true,
                lineStyle: {
                    normal: {opacity: 0.5}
                }
            },
            {
                name: 'MA30',
                type: 'line',
                data: calculateMA(30, data),
                smooth: true,
                lineStyle: {
                    normal: {opacity: 0.5}
                }
            },
            {
                name: 'Volume',
                type: 'bar',
                xAxisIndex: 1,
                yAxisIndex: 1,
                data: data.volumes
            }
        ]
    }, true);


    // 鼠标退出
    myChart.on('mouseout', function (params) {
        setBrush(params.name)
    });
    
    // 设置竖线
    function setBrush(focus) {
        myChart.dispatchAction({
            type: 'brush',
            areas: [
                {
                    brushType: 'lineX',
                    coordRange: [focus, focus],
                    xAxisIndex: 0
                }
            ]
        });
    }
    

});