selectedRangeButtonIndex: Number

Sets the index of Range Buttons that has to be selected by default.

Default: none
Examples: 1, 2, … 
var stockChart = new CanvasJS.StockChart("container",
{
 .
 .
 rangeSelector: {
   selectedRangeButtonIndex: 2,
   .
   .
 },
 .
 . 
});
stockChart.render();
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