CODEWITHSUNDEEP
javascriptamcharts
Zyndoras
Zyndoras

Reputation: 33

Amcharts Serial: How to get current zoom indexes

In the amcharts serial chart you can select a specific area of values to display using this function:

chart.zoomToIndexes(chartData.length - x, chartData.length - 1)

This displays the last x values. However, this selected area can be changed by the user dragging the chart cursor. So if i would want to save the last indexes the chart was zoomed to before leaving the page / doing whatever, how can i get them?

The documentation does not seem to provide any helpful information here...

Upvotes: 1

Views: 3180

Answers (1)

xorspark
xorspark

Reputation: 16012

You probably missed these in the documentation.

startIndex - gives you a read-only value of the current start zoom index.

endIndex - gives you a read-only value of the current end zoom index.

They are accessible through the chart instance. For example, here's how to access them during the zoomed event:

  "listeners": [{
    "event": "zoomed",
    "method": function(e) { 
      console.log('Start zoom index: ', e.chart.startIndex,  'End zoom index: ', e.chart.endIndex);
    }
  }]

Codepen demo

Upvotes: 2

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