Datasets; part of the IE10 compatibility viacrucis

[gabrielmontagne]

Description

Makes the grid revert to data-whatever-attribute when node.dataset is not available.

Motivation and Context

The grid doesn't pretend to run everywhere -- it's the responsibility of the app in which this is to be embedded to cater for transpilations, perspirations and polyfillings which, we'd guess, are needed not only for this component.

But while most of the modern JS usage can be fixed at build time using something like babel-polyfill, some things remain run time pastimes.

At The Office™️ we had two problems that forced us to lay hands on our pre-compiled code (actually only one main problem, IE10 support, but... )

1. D3v4 dispatch of native dom events in IE -- we had to add a good old polyfill to our app.
2. The dataset incompatibility, which cannot really be addressed "once and for all", but needed to be, sad but true, embedded on the grid.

Hence this PR.

Smarter people might find a nicer solution. Please?
Anyways, for now, if you don't mind....

How Was This Tested?

To properly test this we created a (still offline) fully webpacked build with polyfills, etc. to run this on IE.
Nothing we can easily upload to a block

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change follows the style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have read the contribution guidelines
• I have added tests to cover my changes
• All new and existing tests passed

[gabrielmontagne]

@grancalavera ... so far like this goes the var.

[Poetro]

There are polyfills for ES5 browsers like element-dataset, so I don't think it is necessary to hack around this.

[gabrielmontagne]

I'll take it for a spin -- tho... well, let's see : )

[gabrielmontagne]

Yeah, tried that out, even the one you suggested -- but, as I feared, until JS Proxies are supported -- that is, never for good old IE, there is no way that doing node.dataset.heyPeter = 5 can be turned into <node data-hey-peter="5" />

So, I think, we should bring in this ponyfill in until -- ?

[cristiano-belloni]

Also, I'd be wary of bringing in a polyfill using proxies. Might be my superstition, but I heard they're slow as hell (is hell slow?)

[cristiano-belloni]

LGTM

[gabrielmontagne]

hell is slow; I've seen it: F12 => Emulation => 10