Replace jquery ui's sortable with Sortable.js #2523
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tvdeyen
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This feature doesn't work well. It requires using "Tab" to get focus on an item in the list. After doing that it allows pressing up/down to reorder the list. This feature isn't discoverable to users, so I doubt it has ever been used. It also doesn't exist in any of our other sortable tables in the admin. It could just as be implemented using Sortable.js, which we are moving to from jquery-ui's sortable, but I would not rather not spend the time reimplementing something that doesn't work well and isn't consistent with the rest of the admin. If we want this we need to implement is across all of our sortable lists.
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As per #2469, we are looking to remove jquery ui from the admin.
I initially tried to use html5sortable which is nice and very minimal (2KB min+gz). However, I was unable to get it to work satisfactorily on the taxon tree page. There were also minor issues sorting tables (it would get confused if the rows were dragged too far #right).
I ended up using Sortable.js, which is a little heavier (6KB min+gz), but we get a lot from that. Everything just worked without additional code from us (which even jquery ui sortable needed to fix some problems). Sortable's behaviour should also be more user friendly: it shown nice "ghost" placeholders to where the element is to be dropped, supports touch events, supports scrolling the page, and even animations (which I didn't enable, but worth trying in the future).
This PR starts with some housekeeping:
backend/admin.jsinto it's own file,backend/components/sortable_table.jstaxons.js.coffee, the "Display order" page, to plain JS (see Clarify that we prefer new files to be in JS, not coffee #2376 for justification)taxonomy.js.coffee, the "taxon tree" page, to plain JSBefore converting the three places jquery-ui/sortable was used:
sortable_table.jsThis is the last piece of the puzzle for #2469 "Replace jQuery UI".