score:2

Accepted answer

this is the existing issue in highcharts issue tracker

part of the issue is that shared tooltip shouldn't work on scatter series at all, because they are not sorted and laid out in increasing x order. this should be noted in the docs(link).

score:1

add this line of code:

highcharts.seriestypes.scatter.prototype.nosharedtooltip = false;

it disables hicharts default setting which disables scatter plots from being included in shared/split tooltips. this way you do not have to use spline like others suggest, which cant lead to problems such as tooltip following the spline line.

score:2

according highcharts api http://api.highcharts.com/highcharts#tooltip.shared tooltip shared works only for ordered data and not for pie, scatter, flags etc.

score:4

you could try this http://jsfiddle.net/8qt0d4h0/

the new highcharts can not shared tooltip in pie/scatter/flag, so you could handle the scatter as spline , and set the linewidth equal and set states hover equal 0 too.

$(function () {
    $('#container').highcharts({

        xaxis: {
            categories: ['jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul',
                                     'aug', 'sep', 'oct', 'nov', 'dec']
        },

        tooltip: {
            shared: 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],
            type: 'spline',
            "linewidth": 0,
                        "marker": {
              "enabled": "true",
              "states": {
                "hover": {
                  "enabled": "true"
                }
              },
              "radius": 5
            },
          "states": {
            "hover": {
              "linewidthplus": 0
            }
          },
        }, {
            data: [216.4, 194.1, 95.6, 54.4, 29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5]
        },{
            data: [210.4, 190.1, 90.6, 50.4, 20.9, 70.5, 105.4, 120.2, 140.0, 170.0, 130.6, 140.5]
        }]
    });
});

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