如何以编程方式清除echarts中的笔刷选择

Question

I'm using echarts library . I'm creating histograms with bar charts, and using brush selection to highlight bars. Also I want to programmatically select / unselect bars. Following echarts documentation and examples, I understand that this kind of actions are done by using chart.dispatchAction but no brush action is documented or showed. The only related things documented is an option ( brush.removeOnClick ) which, only if brush.brushMode === 'single' allows to clear the brush selection on click. How is it possible to programmatically create / clear brush selections? thanks

Answer 1

There is an undocumented brush action;

Usage example:

Clear brush with the command clear :

chart.dispatchAction({
  type: 'brush',
  command: 'clear',
  areas: [],
});

Create a brush selection (at least in a bar chart with axisType === 'category' ) with:

chart.dispatchAction({
  type: 'brush',
  areas: [
    {
      brushType: 'lineX',
      xAxisIndex: 0,
      coordRange: [from, to],
    },
  ],
});

Where coordRange is an array of 2 axis ticks indexes.

There are a lot of undocumented things in echarts.