[GitHub] jeneser edited a comment on issue #8584: legend 中的图例有没有方法做到最少保留一个不被取消选中？

[GitBox <gi...@apache.org>]

jeneser edited a comment on issue #8584: legend 中的图例有没有方法做到最少保留一个不被取消选中？
URL: https://github.com/apache/incubator-echarts/issues/8584#issuecomment-405833055
 
 
   可以[监听](http://echarts.baidu.com/api.html#events.legendselectchanged) [派发](http://echarts.baidu.com/api.html#action.legend) legend事件，hack一下：
   
   ```
   mychart.on('legendselectchanged', params => {
       let selected = params.selected;
       let count = Object.keys(selected).reduce((acc, val) => {
           return acc + (selected[val] ? 1 : 0);
       }, 0);
   
       if (count === 0) {
           mychart.dispatchAction({
               type: 'legendSelect',
               name: params.name
           });
       }
   });
   ```

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