CODEWITHSUNDEEP
c#javascripthighcharts
Ebikeneser
Ebikeneser

Reputation: 2364

Retrieve first and last values on HighChart

I am working with HighCharts, in particular the line graph.

Using an Aspx button click I wish to retrieve the values of the first and last points on the graph.

When I click on a particular point I can retrieve the value like -

click: function() {

                    X = Highcharts.dateFormat('%A, %b %e, %Y, %H:%M', this.x);
                    Y = this.y;
                    document.getElementById('MainContent_dateTB').value = X;
                    document.getElementById('MainContent_countTB').value = Y;

                   }

Because the graph has a zoom function, this means the first and last point values can be different, so when a user clicks on the Aspx button (not the point on the graph), I need to retrieve the values of the current first and last values on the page.

Upvotes: 0

Views: 282

Answers (1)

SteveP
SteveP

Reputation: 19093

You should try the 'getExtremes' api call.

http://api.highcharts.com/highcharts#Axis.getExtremes()

yextremes = chart.yAxis[0].getExtremes();
xextremes = chart.yAxis[0].getExtremes();
yMax = yextremes.dataMax;
xMax = xextremes.dataMax;
yMin = yextremes.dataMin;
xMin = xextremes.dataMin;

Once you have the min/max x value, you can look through your series data looking for the first/last point within that range.

Upvotes: 1

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