How to achieve synchronous sliding effect of rich text with DataZoom in ECharts?

ECharts Charts: Implement synchronous scrolling of rich text and DataZoom

In ECharts charts, when combining rich text and DataZoom components, you often encounter the problem that the rich text tag cannot be updated synchronously after DataZoom slides. This article analyzes this problem and provides solutions.

Problem description: The content displayed by the rich text label in the chart is not dynamically adjusted with the scrolling range of DataZoom, and the content in the initial state is always displayed. This may be because the rich text configuration is not associated with the scope changes of DataZoom.

The following is an example configuration snippet:

 let xlist = [
    {
        // ...Other configuration axisLabel: {
            interval: 0,
            formatter: function (value, index) {
                return `{${index}| } \n{b|${value}}`
            },
            rich: {}
        },
        // ...Other configuration},
    // ...Other axes configuration];

Observe the code, the DataZoom component is configured and tries to update the chart while scrolling, but it doesn't work well. This may be because the DataZoom event did not trigger the rich text re-rendering.

Solution:

In order to synchronize rich text with DataZoom, the following methods can be considered:

1. Event listening: Listen to DataZoom's 'datazoom' event, dynamically update the rich text configuration when the event is triggered. Listen to events using myChart.on('datazoom', function(params){...}) .

2. Optimize formatter function: In formatter function, rich text content is dynamically generated based on the scope of DataZoom. This ensures that rich text content is updated as DataZoom changes.

3. Use the setOption method: After sliding DataZoom, use the setOption method to reset the chart configuration and force refresh the chart to update the rich text display.

For example, update the rich text configuration in the DataZoom event:

 myChart.on('datazoom', function (params) {
    let start = params.start;
    let end = params.end;
    let xAxisData = option.xAxis[0].data;

    // Update rich text for (let i = 0; i = start / 100 * xAxisData.length && i <p> Through the above methods, the problem of rich text and DataZoom scrolling in ECharts can be effectively solved, ensuring that the chart information is consistent with the DataZoom selection range. Please adjust the code according to the actual configuration.</p>

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