CODEWITHSUNDEEP
javascripthighcharts
Dónal
Dónal

Reputation: 187399

zoom a Highcharts chart programmatically

In this JSFiddle demo I have 2 Highcharts line charts. When one of the charts is zoomed, the other chart should zoom in on the same area. The code that does this is

xAxis: {
    events: {
        afterSetExtremes: function (event) {
            var index = document.getElementById('container2').dataset.highchartsChart;
            var chartPartner = Highcharts.charts[index];
            chartPartner.xAxis[0].setExtremes(event.min, event.max);
            chartPartner.showResetZoom();
        }
    },
},

wherein container2 is the ID of the DOM element that the other chart is rendered to. This behaviour is almost working, but there are a couple of small problems:

Upvotes: 2

Views: 2110

Answers (1)

Florian Wendelborn
Florian Wendelborn

Reputation: 1757

Your problem is that you called setExtremes in an infinite loop, because you told the "afterSetExtremes" event to trigger another "afterSetExtremes" event. You can prevent that easily by having a state-variable.

That's why I introduced this:

var updating = false;

and changed the last part of the events to that:

if (!updating) {
    updating = true;
    chartPartner.xAxis[0].setExtremes(event.min, event.max);
    chartPartner.showResetZoom();
}

JSFiddle: http://jsfiddle.net/qq4wnyqo/1/

Edit: The original JSFiddle even produced a console error 'maximum call stack size exceeded'. Next time you probably want to look for stuff like that.

Edit: you still need to find a solution for hiding the 'reset zoom' buttons after they're used.

Upvotes: 3

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