[Feature] Request to add events that are called before running datazoom.

[kim1124]

What problem does this feature solve?

It would be nice to add an event that can determine whether to run datazoom before running datazoom. As shown in the screenshot below, if the start and end ranges of datazoom are the same, the meaning of datazoom is lost, so I want to block it.

It will be easier to control if you decide whether to run datazoom based on the return value of the event. It will also help improve usability by allowing you to define tasks that need to be processed before data zooming occurs.

What does the proposed API look like?

echarts.on('beforeDataZoom', (params) => {
  // Set the parameters equal to those of the datazoom handler.
  const _startIdx = params.batch[0].startValue
  const _endIdx = params.batch[0].endValue

  // Run datazoom if the return value is true, and do not run datazoom if false.
  return _startIdx < _endIdx
})

[helgasoft]

Zoom attributes are available at any time, no need for events - Demo Code. 📌 please close issue if problem solved.

[github-actions[bot]]

This issue has been automatically marked as stale because it did not have recent activity. It will be closed in 7 days if no further activity occurs. If you wish not to mark it as stale, please leave a comment in this issue.

[github-actions[bot]]

This issue has been automatically closed because it did not have recent activity. If this remains to be a problem with the latest version of Apache ECharts, please open a new issue and link this to it. Thanks!