javascript - Dynamically draw marker on last point in highcharts - Stack Overflow

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I want to draw a marker on the last point. Data source is dynamic. Have a look at following code

$(function() {

    $("#btn").click(function() {
        var l = chart.series[0].points.length;
        var p = chart.series[0].points[l - 1];
        p.marker = {
            symbol: 'square',
            fillColor: "#A0F",
            lineColor: "A0F0",
            radius: 5
        };
        a = 1;
        chart.series[0].points[l - 1] = p;
        chart.redraw(false);

    });



    var ix = 13;
    var a = 0;

    var chart = new Highcharts.Chart({
        chart: {
            renderTo: 'container',
            events: {
                load: function() {
                    var series = this.series[0];
                    setInterval(function() {
                        ix++;
                        var vv = 500 + Math.round(Math.random() * 40);
                        chart.series[0].data[0].remove();
                        var v;
                        if (a == 1) v = {
                            y: vv,
                            x: ix,
                            marker: {
                                symbol: 'square',
                                fillColor: "#A0F",
                                lineColor: "A0F0",
                                radius: 5
                            }
                        }
                        else v = {
                            y: vv,
                            x: ix
                        }

                        a = 0;

                        series.addPoint(v);
                    }, 1500);
                }
            }
        },
        plotOptions: {
            series: {}
        },

        series: [{
            data: [500, 510, 540, 537, 510, 540, 537, 500, 510, 540, 537, 510, 540, 537]}]
    });
});

/

On button click event I am trying to draw marker on last point which is already added to chart.

Is there a way to do that??

I want to draw a marker on the last point. Data source is dynamic. Have a look at following code

$(function() {

    $("#btn").click(function() {
        var l = chart.series[0].points.length;
        var p = chart.series[0].points[l - 1];
        p.marker = {
            symbol: 'square',
            fillColor: "#A0F",
            lineColor: "A0F0",
            radius: 5
        };
        a = 1;
        chart.series[0].points[l - 1] = p;
        chart.redraw(false);

    });



    var ix = 13;
    var a = 0;

    var chart = new Highcharts.Chart({
        chart: {
            renderTo: 'container',
            events: {
                load: function() {
                    var series = this.series[0];
                    setInterval(function() {
                        ix++;
                        var vv = 500 + Math.round(Math.random() * 40);
                        chart.series[0].data[0].remove();
                        var v;
                        if (a == 1) v = {
                            y: vv,
                            x: ix,
                            marker: {
                                symbol: 'square',
                                fillColor: "#A0F",
                                lineColor: "A0F0",
                                radius: 5
                            }
                        }
                        else v = {
                            y: vv,
                            x: ix
                        }

                        a = 0;

                        series.addPoint(v);
                    }, 1500);
                }
            }
        },
        plotOptions: {
            series: {}
        },

        series: [{
            data: [500, 510, 540, 537, 510, 540, 537, 500, 510, 540, 537, 510, 540, 537]}]
    });
});

http://jsfiddle/9zNUP/

On button click event I am trying to draw marker on last point which is already added to chart.

Is there a way to do that??

• javascript
• charts
• highcharts

Share Improve this question Follow edited Nov 22, 2012 at 18:28 Jugal Thakkar 13.5k44 gold badges6363 silver badges8181 bronze badges asked Jun 18, 2012 at 13:20 ManjoorManjoor 4,1991010 gold badges4444 silver badges6969 bronze badges 1

• If any answer helped, please vote/mark it accordingly – Jugal Thakkar Commented Aug 6, 2012 at 21:29

Add a ment  | 

1 Answer 1

Sorted by: Reset to default 9

 $("#btn").click(function() {
    var l = chart.series[0].points.length;
    var p = chart.series[0].points[l - 1];
    p.update({
        marker: {
            symbol: 'square',
            fillColor: "#A0F",
            lineColor: "A0F0",
            radius: 5
        }
    });
    a = 1;

});

solution @ http://jsfiddle/jugal/zJZSx/

Also tidied up your code a little, removed the removal of point before adding one at the end, highcharts supports it inbuilt with the third param to addPoint as true, which denotes shift series, which removes first point and then adds the given point.

I didn't really understand what the a vv etc were, but well i didn't bother much either. I think this is enough based on what you asked for.

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