Highstock:如何以编程方式对所选值求和并将总和显示给用户 [英] Highstock: how programmatically sum selected values and show the sum to user

问题描述

如何将所选范围内的直线上的点求和以显示给用户?

How Can I sum the points in a line within a selected range in order to be shown to users?

推荐答案

是的，可以通过使用afterSetExtremes函数(

Yes it is possible, by means of using afterSetExtremes function (http://api.highcharts.com/highstock#xAxis.events.afterSetExtremes) which allows to catch "change" range event and run custom function. So then you can interate for all points in serie and limit which of them should be added to sum, by check min/max range value.

http://jsfiddle.net/2WdQw/

afterSetExtremes: function(e) {
                var sum = 0,
                    chartOb = this;

                $.each(chartOb.series[0].data,function(i,point){

                    if(point.x >= chartOb.min && point.x <= chartOb.max)
                        sum += point.y;

                });


                $('#report').html('Sum: '+sum);
            }

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