[GitHub] dan5000 commented on issue #4990: Question: Dynamically change data existing data on Zoom event

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

dan5000 commented on issue #4990: Question: Dynamically change data existing data on Zoom event
URL: https://github.com/apache/incubator-echarts/issues/4990#issuecomment-397446582
 
 
   Another way to do it is using the current chart instance` xAxis[0].rangeStart/rangeEnd`
   Then filter the original data array against the xAxis times. This only works for timeseries, just thought someone might find it useful. Here's an example:
    
   ```  
   //
   const DATA = [[1319846400000, 0.0911189678976507], [1319932800000, 0.088428855674535],…]
   
   onDataZoom(zoom, chart) {
       const option = chart.getOption()
   
       const start = option.xAxis[0].rangeStart
       const end = option.xAxis[0].rangeEnd
       const cropped = DATA.filter(r => r[0] > start && r[0] < end)
       const rezipped = this.loess(cropped)
       option.series[10].data = rezipped
       chart.setOption(option)
     }```

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