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Testing and Issues

You can test this app and submit issues during the testing period of the JavaScript Chart contest.

Entries with serious issues will not be able to win the contest, but even minor issues might be important for overall results.


by rating


Fair Mammoth May 8, 2019 at 12:56
— Overall performance is above average.

— Filtering is slow for graphs #3 and #5 (LG Nexus 5X, Android 8.1).
— Y-scale doesn't disappear after filtering (graph #2)
— Bonus goal is implemented, however parts of the expected animations are missing (e.g. zooming out).

— Pie chart display wrong values (
— The third graph glitches after filtering and zooming out (
iPhone 5S, iOS 12.1; LG Nexus 5X, Android 8.1.
Deleted Account Apr 21, 2019 at 15:43
Error in 3 graph
Windows 8, opera
Pie chart works fine, but the timeline (navigator) for it is wrong.
Chrome 73
wrong percentage on pie, due wrong input data. Data is correct on main view, but is not for pie view
You do not have "zoom out" animation on all graphs.
Deleted Account Apr 25, 2019 at 06:50
Dude, there is a girl in @contests called Elene Vednight, going crazy about you, you better give her a call
Bars: can't focus on most left bar
MBP 2018 15, Mojave, Chrome
Line chart: Y doesn't start from min value but from 0
MBP 2018 15, Mojave, Chrome
Really good performance overall but switching is not quite fast! Have a like from me!
Chrome for Android / Nexus 6p
Deleted Account Apr 18, 2019 at 22:18
It doesn’t stick to bottom
iPhone SE/safari
Shiny Deer Apr 18, 2019 at 22:34
Scale is designed not to just show top-bottom values, but rounded values near bounds. Plus there is some reserved space for points close to viewport to avoid jumps
Shiny Deer Apr 19, 2019 at 12:54
y-axis bounds are aligned to round numbers
Zoom in jumps to the wrong date (+1 day) for line charts and stacked bar charts.
Chrome 73
Stacked: can't focus on most left/right values if trimmer has no full width of preview
MBP 2018 15, Mojave, Chrome
Incorrect X axis behavior (compare the dates on the screenshots), no header animation
Redmi 3 / Android
You have no animation of the appearance and disappearance of buttons and preview zone when zooming.
The red bars are almost invisible on this chart.
Shiny Deer Apr 17, 2019 at 19:21
Because values of red column are too small in comparison with other columns. So data visualization is correct here
On this graph, when zoom, the range of dates should decrease, you have the entire period of all dates available
Shiny Deer Apr 17, 2019 at 19:23
Actually it decreases. You can see it during zoom in animation
Pie scrollbar has to have bar type, not a line.
No snapping to days, months
Long click on buttons does nothing
Shiny Deer Apr 18, 2019 at 20:46
Long tap behavior works as intended. Could you share some screencast?
The long touch / click works well on all charts except the final one (stacked percentage).
Chrome 73
Shiny Deer Apr 19, 2019 at 13:10
Thank you, but that is intentional. Using this behavior for percentage graphs makes no sense. In my opinion
Several problems with pie charts:
when clicking on a date, the pie chart is created for a range of dates rather than a selected date; not sure how the start and end dates of the selection in this case are defined;

it is impossible to select less than 4 days for a pie chart;

I think this is due to misunderstanding of the requirements; But event if we suppose that by design the pie chart should display the sum of values for the selected dates, checking that for 'apples' for 3 Apr - 6 Apr shows that the pie chart value is incorrect. It is unclear how that is calculated.
Chrome 73
Good job!
100% should probably be in the center of the circle (pie chart, 1 serie selected):
background is highlighted after clicks
Moving from point to point is not animated, but this behavior shown on video example provided by telegram (example video #1), means better to implement
The tooltip for standard mode of the percentage chart can sometimes stay displayed when entering the pie chart mode. I noticed that it happens mainly when the tooltip was displayed somewhere in the middle of the chart.
Chrome 73
The date labels (a.k.a. x-axis labels) are pretty much off the related date on the graph. It is almost insignificant for big scale of bar charts, but in other cases - it is very obvious.
Chrome 73
Nobody added any issues yet...