Highcharts event handler after finishing redraw

user_629797 0
Viewed 1499

I am trying to show the total of the Y axis as a subtitle for a HighStock chart. This is initially accomplished by summing up the point.y value of all the series, inside the "load" event like so:

chart: {
    events: {
        load: function () {
            var chart = this,
                series = chart.series,
                seriesSum = 0;
            series.forEach(function (series) {
                series.data.forEach(function (point) {
                    seriesSum += point.y
                })
            })
            this.update({
                subtitle: { text: 'TOTAL:  ' + seriesSum }
            });
        },
    }
}

Now I need to update the TOTAL amount after the chart has been redrawn after changing the timeframe using either the Navigator or the Range Selector. I know there is a "redraw" event, but that will end me up in an infinite loop. Which event should I be tack onto?

highcharts
2 Answers

You can use the redraw event, and just not redraw within a pending redraw. For example:

chart: {
    events: {
        redraw: function () {
            this.update({
                subtitle: { text: 'TOTAL:  ' + seriesSum }
            }, false);
        }
    }
}

Note the false parameter to the Chart.update function to prevent further redrawing (infinite loop).

See this JSFiddle demonstration using Highcharts and the redraw event.

user_27329910

You can use update method with redraw flag in redraw event, but you must set right conditions to not to fall into an infinite loop:

var redrawEnabled = true;

var chart = Highcharts.chart('container', {
    chart: {
        zoomType: 'x',
        events: {
            redraw: function() {
                if (redrawEnabled) {
                    var sum = 0;
                    redrawEnabled = false;

                    Highcharts.each(this.series[0].points, function(point) {
                        if (point.isInside) {
                            sum += point.y;
                        }
                    });

                    this.update({
                        subtitle: {
                            text: sum
                        }
                    });

                    redrawEnabled = true;
                }
            }
        }
    },
    series: [{
        data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
    }]
});

Live demo: http://jsfiddle.net/BlackLabel/dewumkz6/

user_89513770
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