Synchronized charts example with Highstock crashes with "Cannot read property 'category' of undefined" - highcharts

Question

I want the functionality of the "Synchronized charts" example, but with Highstock. But when trying to accomplish this, I get "highstock.src.js:9991 Uncaught TypeError: Cannot read property 'category' of undefined"
This also holds directly for the example: http://www.highcharts.com/demo/synchronized-charts doesn't work when converted to Highstock: http://jsfiddle.net/9gq47g0w/
(Since StackOverflow demands me to post some code along with the fiddle, here's from Highstock, noting the point where it crashes with **):
/**
* Refresh the tooltip's text and position.
* #param {Object} point
*/
refresh: function (point, mouseEvent) {
...
// shared tooltip, array is sent over
if (shared && !(point.series && point.series.noSharedTooltip)) {
...
textConfig = {
x: ** point[0].category, ** <- here!
y: point[0].y
};
...
}
...
},

Answer 1

Here you can find an example of synchronized highstock charts:
http://jsfiddle.net/vw77cooj/20/
This example is using custom functions for synchronizing extremes and tooltips on charts:
function syncExtremes(e) {
var thisChart = this.chart;
if (e.trigger !== 'syncExtremes') { // Prevent feedback loop
Highcharts.each(Highcharts.charts, function(chart) {
if (chart !== thisChart) {
if (chart.xAxis[0].setExtremes) { // It is null while updating
chart.xAxis[0].setExtremes(e.min, e.max, undefined, false, {
trigger: 'syncExtremes'
});
}
}
});
}
}
$('#container').bind('mousemove touchmove touchstart', function(e) {
Highcharts.each(Highcharts.charts, function(chart) {
event = chart.pointer.normalize(e.originalEvent);
point = chart.series[0].searchPoint(event, true);
if (point) {
point.onMouseOver(); // Show the hover marker
chart.tooltip.refresh(point); // Show the tooltip
chart.xAxis[0].drawCrosshair(event, point); // Show the crosshair
}
});
});
In case of having multiple series on your chart you may change function responsible for synchronizing your tooltip:
function syncTooltip(container, p) {
var i = 0,
j = 0,
data,
series,
points = [];
for (; i < chartSummary.length; i++) {
if (container.id != chartSummary[i].container.id) {
series = chartSummary[i].series
Highcharts.each(series, function(s) {
Highcharts.each(s.data, function(point) {
if (point.x === p && point.series.yAxis.options.index !== 1) {
points.push(point)
}
})
});
chartSummary[i].tooltip.refresh(points);
}
};
}
http://jsfiddle.net/ZArZM/316/

Answer 2

For a nice working example on Highstock, please follow this example with MouseOver and MouseOut:
var onMouseOver = function onMouseOver() {
var x = this.x,
interactedChart = this.series.chart,
points = [],
charts = Highcharts.charts,
each = Highcharts.each;
each(charts, function(chart) {
if (chart !== interactedChart) {
each(chart.series, function(series) {
each(series.data, function(point) {
if (point.x === x && point.series.yAxis.options.index !== 1) {
points.push(point)
}
})
});
each(points, function(p) {
p.setState('hover');
});
chart.tooltip.refresh(points);
}
});
}
http://jsfiddle.net/ska1r5wq/
You can avoid many tooltip issues from examples provided on the web.
Source : https://github.com/highcharts/highcharts/issues/6595