HighchartsXAxisSpecificationProblem

Three example Highstocks HTML files, one works, one is broken by making the data timestamps irregular, and the last shows a failed attempt to fix

Fix in fourth file

See corrected.html

Background

The working version is a slightly modified version of the example Emerson entered for help with a javascript console error 15 (https://stackoverflow.com/questions/46164090/sorting-scatter-highstock-chart-with-multiple-series). Ignoring the console error, we want to the Highstocks navigator on a scatter plot with irregular data timestamps. The working version included here has a large 2D-array 'points' with regular time intervals. The xaxis declaration has a 'data' definition mapping values from 'points'.

data: points.map(function(point) {
  return [point[2]];
}),

the only changes in the broken version is a set of arbitrary deletes from the 'points' array to force the timestamps to be sufficiently irregular to break the date inference provided by Highcharts. (If you delete just a few lines from the working copy's 'points' 2D-array, it still works). In the screen grab 'broken_badTickArray.html.png', you can see the dates are Dec 31, 1969 to Jan 1, 1970 and the tick array data is indecipherable.

The attempted fix (version uploaded only 'representative' of several tries)

Starting with the broken version, several attempts were made to overcome the erroneous date range problem. The screen grab 'works_goodTickArray.html.png' shows that Highcharts boiled down the large number of timestamps to a small set of midnight day boundaries. In the attempted fix version, the following code generators an explicit set of timestamps that are then given as the value for the x-axis data.

var xtd = [];
var apr222017 = 1492819200000;
var may162017 = 1494892800000;
var x = 0;
do {
	xtd[x] = apr222017 + (x * 86400000);
	x++
} while ((apr222017 + (x * 86400000)) < may162017);

When that didn't work, attempted to set 'floor' and 'ceiling'...

// ...
data: xtd,
floor: apr222017,
ceiling: may162017,
// ...

Having no luck with that added...

min: apr222017,
max: may162017,

which didn't help. Nor did removng the floor and ceiling definitions and going only with min/max.

Adding the following also failed: tickPositioner: function() { return xtd; },