[GitHub] flyingzl commented on issue #4576: echarts如何禁用最后一个legend的点击事件？

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

flyingzl commented on issue #4576: echarts如何禁用最后一个legend的点击事件？
URL: https://github.com/apache/incubator-echarts/issues/4576#issuecomment-429719323
 
 
   @VAEAZE 写这样一个函数就行
   
   ```javascript
    /**
     * Echarts中有多图列时，保证Echarts图表至少有一个lenged处于选中状态
     * @parm chart Echarts实例
     */
   const contraintEchartHaveOneVisibleLegend = chart => {
           chart.on('legendselectchanged', function(params) {
               const option = this.getOption()
               const selectedLegends = params.selected
               const keys = Object.keys(selectedLegends)
               const currentLegend = params.name
               if (!keys.filter(key => selectedLegends[key]).length) {
                   option.legend[0].selected[currentLegend] = true
               }
               this.setOption(option)
           })
       }
   }
   ```
   
   

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