[Solved]-Get notice when a Highcharts chart is change after change the window size-Highcharts

The chart redraw event fires when the chart div resizes http://api.highcharts.com/highcharts#chart.events.redraw

events: {
            redraw: function () {
                alert("redrawing chart");
            }
        }

Note, this fires for other reasons as well e.g. when you add a datapoint, or modify series options etc.