# Welcome to the Highcharts Maps JS (highmaps) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

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# series.mapline.data.events.dragStart

Callback that fires when starting to drag a point. The mouse event object is passed in as an argument. If a drag handle is used, `e.updateProp` is set to the data property being dragged. The `this` context is the point. See drag and drop options.