[GitHub] [incubator-echarts] EfkanKnz edited a comment on issue #8694: How to highlight selected data point.

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

EfkanKnz edited a comment on issue #8694: How to highlight selected data point.
URL: https://github.com/apache/incubator-echarts/issues/8694#issuecomment-510525854
 
 
   Hi, for those who might have the same issue (but with **LINE echarts**), I found an alternative to "highlight" a selected point. I use `markPoint` option.
   
   When we click on a point on the chart, we create a new mark with the coordinates (x,y) of this point itself.
   
   Angular files:
   
   **component.html**
   ```
   <div
     echarts
     class="echart"
     [autoResize]="true"
     [options]="chartOption"
     (chartClick)="onChartClick($event)"
     (chartInit)="onChartInit($event)"
   >
   </div>
   ```
   
   **component.ts**
   ```
   onChartInit(ec: any): void {
     this.echartsInstance = ec;
   }
   
   onChartClick(event: any): void {
     if (event) {
       this.resetAllMarkPoint();
   
       /* My structure is like this
       this.chartOption.series = [
         {
           name: 'firstLine',
           type: 'line',
           symbolSize: 4,
           smooth: true,
           markPoint: { data: [] },
           data: [[1, 10],[2,20],[3,30]],
           connectNulls: true
         }
       ];
       */
   
       this.chartOption.series[event.seriesIndex]['markPoint'].data = [
         { value: event.value[1], xAxis: event.dataIndex, yAxis: event.value[1] }
       ];
       this.refresh();
     }
   }
   
   resetAllMarkPoint(): void {
     this.chartOption.series.forEach(element => {
       element['markPoint'].data = [];
     });
   }
   
   refresh(): void {
     if (this.echartsInstance) {
       this.echartsInstance.setOption(this.chartOption, true);
     }
   }
   ```
   
   **component.scss**
   ```
   .echart {
     height: 400px;
   }
   ```
   
   Maybe it can help someone ;)

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