Вы используете общую библиотеку Echarts без компонента VisualMap, см. build build :) Замените в пути от echarts-en.common.js до echarts-en.js, и VisualMap будет работать. Для компонента вам нужно установить calculable на true, если вы хотите показать маркеры.
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"min_val": 0,
"max_val": 8041
};
const div = document.createElement('div');
div.id = 'plot';
div.style.width = '500px';
div.style.height = '200px';
document.body.appendChild(div);
const plot = echarts.init(div);
const option = {
xAxis: {
scale: true,
name: "G",
nameLocation: "middle",
nameGap: 30,
nameTextStyle: {
fontSize: 16
},
splitLine: false
},
yAxis: {
scale: true,
name: "D",
nameTextStyle: {
fontSize: 16
},
splitLine: false
},
visualMap: {
min: data.min_val,
max: data.max_val,
dimension: 1,
orient: "vertical",
right: "10%",
top: "center",
itemWidth: "10px",
itemHeight: "80px",
text: ["H", "L"],
calculable: false,
realtime: false,
hoverLink: false,
inRange: {
color: ["#f2c31a", "#24b7f2"]
},
textStyle: {
fontSize: 16
}
},
series: [{
symbolSize: 1,
data: data.data,
type: "line",
large: true,
areaStyle: {
color: {
type: 'linear',
x: 0,
y: 0,
x2: 0,
y2: 1,
colorStops: [{
offset: 0,
color: "#24b7f2"
},
{
offset: 1,
color: "#f2c31a"
}
]
}
}
}]
};
option.series[0].lineStyle = Object.assign({}, option.series[0].areaStyle);
option.series[0].lineStyle.opacity = 0.05;
option.series[0].itemStyle = Object.assign({}, option.series[0].areaStyle);
option.series[0].itemStyle.opacity = 0.05;
plot.setOption(option);
<script src="https://cdnjs.cloudflare.com/ajax/libs/echarts/4.7.0/echarts-en.js"></script>