Files: 5735e273f1d15ee90fb67318abe87d354d52a937 / junk / keyscroll.js
851 bytesRaw
| 1 | module.exports = function keyscroll (container) { |
| 2 | var curMsgEl |
| 3 | |
| 4 | if (!container) return () => {} |
| 5 | |
| 6 | container.addEventListener('click', onActivateChild, false) |
| 7 | container.addEventListener('focus', onActivateChild, true) |
| 8 | |
| 9 | function onActivateChild (ev) { |
| 10 | for (var el = ev.target; el; el = el.parentNode) { |
| 11 | if (el.parentNode === container) { |
| 12 | curMsgEl = el |
| 13 | return |
| 14 | } |
| 15 | } |
| 16 | } |
| 17 | |
| 18 | return function scroll (d) { |
| 19 | selectChild((!curMsgEl || d === 'first') ? container.firstChild |
| 20 | : d < 0 ? curMsgEl.previousElementSibling || container.firstChild |
| 21 | : d > 0 ? curMsgEl.nextElementSibling || container.lastChild |
| 22 | : curMsgEl) |
| 23 | |
| 24 | return curMsgEl |
| 25 | } |
| 26 | |
| 27 | function selectChild (el) { |
| 28 | if (!el) { return } |
| 29 | |
| 30 | ;(el.scrollIntoViewIfNeeded || el.scrollIntoView).call(el) |
| 31 | el.focus() |
| 32 | curMsgEl = el |
| 33 | } |
| 34 | } |
| 35 | |
| 36 |
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