Created
July 25, 2018 22:46
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Minimal RxJS + Flux drag-and-drop to reorder POC
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| <!doctype html> | |
| <html lang=en> | |
| <head> | |
| <meta charset=utf-8> | |
| <title>rx-drag-to-reorder</title> | |
| <style> | |
| #container { | |
| width: 30em; | |
| } | |
| .list { | |
| list-style-type: none; | |
| padding-left: 0; | |
| } | |
| .list li { | |
| display: block; | |
| height: 2em; | |
| background-color: lightgreen; | |
| margin: 0.5em 0; | |
| transition: margin-bottom 0.2s ease-in-out; | |
| } | |
| .list li.dragged { | |
| background-color: orangered; | |
| } | |
| .list li.hovered { | |
| margin-bottom: 2.5em; | |
| } | |
| .list li:first-child.hovered:before { | |
| content: ""; | |
| display: block; | |
| height: 2em; | |
| background-color: lightblue; | |
| border: 2px dashed red; | |
| } | |
| .list li.hovered:after { | |
| content: ""; | |
| display: block; | |
| height: 2em; | |
| background-color: lightblue; | |
| border: 2px dashed red; | |
| margin-top: 1em; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="container"></div> | |
| <!-- <script src="rx.all.min.js"></script> --> | |
| <!-- <script src="rx.dom.min.js"></script> --> | |
| <!-- <script src="lodash.min.js"></script> --> | |
| <script src="https://unpkg.com/rx@4.1.0/dist/rx.all.min.js"></script> | |
| <script src="https://unpkg.com/rx-dom@7.0.3/dist/rx.dom.min.js"></script> | |
| <script src="https://unpkg.com/lodash@4.17.4/lodash.min.js"></script> | |
| <script src="index.js"></script> | |
| </body> | |
| </html> |
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| const listItems = ['foo', 'bar', 'baz', 'qux', 'quux', 'quuz', 'corge', | |
| 'grault', 'garply', 'waldo', 'fred', 'plugh', 'xyzzy', 'thud'] | |
| const render = el => content => { el.innerHTML = content }; | |
| // ---------------------------------------------------------------------------- | |
| const Dispatcher = new Rx.Subject(); | |
| Dispatcher.onCompleted = () => {}; | |
| const send = (tag, arg) => ev => Dispatcher.onNext({ | |
| tag, | |
| data: typeof arg === 'function' ? arg(ev) : arg, | |
| }) | |
| // ---------------------------------------------------------------------------- | |
| const list = Dispatcher.filter(x => x.tag === 'LIST') | |
| .startWith(listItems) | |
| const dragIdx = Dispatcher.filter(x => x.tag === 'ENTER') | |
| .pluck('data') | |
| .first() | |
| .merge(Rx.Observable.never()) | |
| .startWith(null) | |
| .takeUntil(Dispatcher.filter(x => x.tag === 'DRAGEND')) | |
| .repeat() | |
| const hoverIdx = Dispatcher.filter(x => x.tag === 'ENTER') | |
| .pluck('data') | |
| .startWith(null) | |
| .takeUntil(Dispatcher.filter(x => x.tag === 'DRAGEND')) | |
| .repeat() | |
| .distinctUntilChanged() | |
| const listOrdered = Dispatcher.filter(x => x.tag === 'DRAGEND') | |
| .pluck('data') | |
| .withLatestFrom([ | |
| list, | |
| dragIdx.filter(x => x != null), | |
| hoverIdx.filter(x => x != null), | |
| ]) | |
| .merge(list.take(1)) | |
| .scan((list, [, , dragIdx, dropIdx]) => { | |
| const val = list[dragIdx] | |
| list.splice(dragIdx, 1) | |
| list.splice(dropIdx, 0, val) | |
| return list | |
| }) | |
| const app = Rx.Observable.combineLatest([ | |
| listOrdered, | |
| hoverIdx, | |
| dragIdx, | |
| ], (xs, hoverIdx, dragIdx) => ''.concat( | |
| '<ul class="list">', xs.map((x, xIdx) => `<li | |
| draggable="true" | |
| class="${xIdx === hoverIdx ? 'hovered' : ''} ${xIdx === dragIdx ? 'dragged' : ''}" | |
| ondragend="send('DRAGEND', ${xIdx})(event)" | |
| ondragenter="send('ENTER', ${xIdx})()" | |
| > | |
| ${x}</li>`).join('\n'), | |
| '</ul>', | |
| )); | |
| // ---------------------------------------------------------------------------- | |
| const sub1 = Dispatcher | |
| .subscribe(x => console.log('N', x), x => console.log('E', x)); | |
| const sub2 = app | |
| .subscribe(render(document.querySelector('#container'))) |
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