How to dynamically adjust the yAxis.nameGap and left offset of the echarts chart based on yAxis data?

Dynamic adjustment of ECharts chart yAxis.nameGap and left offset

In the ECharts chart, overlapping yAxis name and data value is a common problem, especially when the range of yAxis data value changes greatly. This article introduces how to dynamically adjust yAxis.nameGap and left offset based on yAxis data to improve the readability of the chart.

The following figure shows the problem of overlapping yAxis name and data value:

(This should be replaced with the actual picture representing the example picture)

This problem can be effectively solved by dynamically calculating the maximum yAxis value and adjusting yAxis.nameGap according to the maximum value. For example:

 // Get the maximum yAxis value (assuming the data has been loaded into option.yAxis[0].data)
const yAxisMaxVal = Math.max(...option.yAxis[0].data);

// Dynamically set yAxis.nameGap according to the maximum value
option.yAxis[0].nameGap = yAxisMaxVal > 1000000 ? 100 : (yAxisMaxVal > 10000 ? 75 : 50);

// (Optional) Adjust the left offset according to the maximum value, for example:
const leftOffset = yAxisMaxVal > 1000000 ? 120 : (yAxisMaxVal > 10000 ? 100 : 80);
option.grid = { ...option.grid, left: leftOffset };


//Re-render the chart using the updated option myChart.setOption(option);

This code first gets the maximum value in option.yAxis[0].data . Then, use the ternary operator to dynamically set yAxis.nameGap based on the maximum value. At the same time, the code also provides an optional left-side offset adjustment, dynamically adjusting grid.left attribute according to the maximum value, further optimizing the chart layout. Remember to place this code after the chart data is loaded. According to actual conditions, the value interval and corresponding values ​​of nameGap and left can be adjusted to achieve the best visual effect.

This method ensures that the yAxis name and data value are always kept at the right spacing, improving the clarity and aesthetics of the chart. Please note that this is just an example, and it may need to be adjusted according to data characteristics and chart style in actual applications.

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