Accepted answer

a little late to this (radarchart author here).

The short answer is that this is a bug. I've made an issue: and will report back when fixed.

Longer answer is in two bits. radarchart only just got updated to use the latest chart.js version (version 2.4.0) so the syntax you would need to update to get the version 2 syntax.

However, the way the optional arguments are nested now means that this still won't work.

The cleanest way to fix it will be in the proposed API changes for the version 1 release. However, if I can add support for it in the mean time I'll post here to update you.

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