gbrian commented on issue #8694: How to highlight selected data point. URL: https://github.com/apache/incubator-echarts/issues/8694#issuecomment-522036600 In my case to get the effect above, I'm using **itemStyle.opacity** I'm storing local "state" on each series point to know if it's selected. Then applying the style based on the "selected" state. So more or less: ``` var series = this.chartOption.series; var clickSeries = series[event.seriesIndex].data; var entry = clickSeries[ev.dataIndex]; entry.clicked = !entry.clicked; var any = clickSeries.filter(d => d.clicked).length !== 0; series.map(d => d.itemStyle.opcacity = !any || d.clicked ? 1: 0.3); echart.setOption({series}); ```
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