| 1 | /* select.js — the searchable-select enhancement, rastrillo.js's sibling |
| 2 | on the same rules: first-party, dependency-free, inert by default. Only |
| 3 | a <select> opting in with data-rst-select is enhanced, and it stays a |
| 4 | real <select> in the page, so everything works with scripts off. |
| 5 | |
| 6 | The PURE half (ranking a query, what leaving the box commits, which |
| 7 | blanks are prompts) has no DOM or state and is exported to Node behind |
| 8 | a guard, so ui/select_node.mjs pins it without a browser. The rest sits |
| 9 | behind the `document` guard. App-owned once scaffolded. Converged with |
| 10 | Tito Go's searchselect, whose country picker taught most of it. |
| 11 | |
| 12 | Vocabulary, on the <select>: |
| 13 | data-rst-select mirror a filterable ARIA 1.2 combobox |
| 14 | onto it |
| 15 | data-rst-select="false" never; stay a native select |
| 16 | data-rst-select-filter the search box's placeholder |
| 17 | data-rst-select-results live-region text, {n} substituted |
| 18 | data-rst-select-result-one live-region text for exactly one |
| 19 | data-rst-select-no-matches the row shown when nothing matches |
| 20 | On an <option>, all optional: |
| 21 | data-rst-name / data-rst-desc a name and a quieter description, when |
| 22 | the option's text is "Name (desc)" |
| 23 | data-rst-short what the CLOSED box shows once this is |
| 24 | picked ("+44"), for a narrow box |
| 25 | data-rst-lead a decorative glyph before the row and |
| 26 | the box (a flag); never the only thing |
| 27 | saying which option this is |
| 28 | data-rst-terms more words the search matches (an ISO |
| 29 | code, "+971") that the row does not print |
| 30 | data-rst-first leads its ties in an exact search |
| 31 | data-rst-prompt a blank that asks rather than answers |
| 32 | ("Country") |
| 33 | An <hr> between two options is drawn as a divider, hidden while |
| 34 | searching. An <optgroup> becomes a labelled group; a search ranks |
| 35 | across groups and hides their headings, and clearing it puts every |
| 36 | row back in its own group. |
| 37 | |
| 38 | Content added after load is enhanced when the page dispatches |
| 39 | rst:select-scan on document ({detail: {root}} to look only there). |
| 40 | |
| 41 | field-select.html emits the strings from the base catalog |
| 42 | (rastrillo.ui.select_*) on attributes: the browser has no catalog. */ |
| 43 | (function () { |
| 44 | "use strict"; |
| 45 | |
| 46 | // fold is what a query and an option are compared as: lower case, with the |
| 47 | // accents taken off and a curly apostrophe read as a straight one, so "cote" |
| 48 | // and "cote d'ivoire" find "Côte d’Ivoire" and "osterreich" finds |
| 49 | // "Österreich" — someone on a keyboard without the letter still gets there. |
| 50 | const fold = (s) => |
| 51 | String(s || "").normalize("NFD").replace(/\p{M}/gu, "").replace(/[\u2018\u2019]/g, "'").toLowerCase().trim(); |
| 52 | |
| 53 | // rank says how well one option answers a query, lower being better, or -1 |
| 54 | // for no match at all. An option is {name, text, terms}: name is the words |
| 55 | // the row leads with, text the whole string (name and desc), terms the extra |
| 56 | // words it answers to. 0 is an exact hit (typing "gb" or "+44" or the whole |
| 57 | // name); 1 is the start of the name; 2 the start of one of its later words, |
| 58 | // or of a term; 3 is anywhere in the text. The start of the name outranks the |
| 59 | // start of a later word, so "sudan" is Sudan before South Sudan and "guinea" |
| 60 | // is Guinea before Equatorial Guinea. A term is matched from its start with |
| 61 | // or without a leading "+", so "971" finds +971 as surely as "+971" does. |
| 62 | // folded is an option's words read once, as rank compares them: an option |
| 63 | // may carry them precomputed (select.js does, so a keystroke over 240 |
| 64 | // countries folds only the query), or they are read here. Everything rank |
| 65 | // derives from an option's own words is read here too — the name without |
| 66 | // its trailing bracket, the words it splits into, the terms without their |
| 67 | // "+" — so a keystroke does no string work on an option at all. |
| 68 | const plain = (t) => t.replace(/^\+/, ""); |
| 69 | const folded = (o) => { |
| 70 | if (o.folded) return o.folded; |
| 71 | const name = fold(o.name); |
| 72 | const terms = (o.terms || []).map(fold).filter(Boolean); |
| 73 | return { |
| 74 | name, |
| 75 | text: fold(o.text), |
| 76 | terms, |
| 77 | // A trailing bracket is a gloss on the name, not part of it: somebody who |
| 78 | // types "india" whole has named "India (+91)" exactly. |
| 79 | bareName: name.replace(/\s*\([^()]*\)$/, ""), |
| 80 | words: name.split(/[\s\-’'(),.]+/).filter(Boolean), |
| 81 | plainTerms: terms.map(plain), |
| 82 | }; |
| 83 | }; |
| 84 | |
| 85 | // ranked is rank for a query already folded, which is how order asks: once |
| 86 | // per keystroke, not once per option. |
| 87 | const ranked = (o, q) => { |
| 88 | if (!q) return 0; |
| 89 | const bare = q.replace(/^\+/, ""); |
| 90 | const f = folded(o); |
| 91 | const name = f.name; |
| 92 | const terms = f.terms; |
| 93 | const plains = f.plainTerms; |
| 94 | // A term typed whole, with or without its "+": "44" is +44 exactly. |
| 95 | if (name === q || f.bareName === q || terms.includes(q) || (bare && plains.includes(bare))) return 0; |
| 96 | if (name.startsWith(q)) return 1; |
| 97 | if (f.words.some((w) => w.startsWith(q))) return 2; |
| 98 | if (bare && plains.some((t) => t.startsWith(bare))) return 2; |
| 99 | if (f.text.includes(q)) return 3; |
| 100 | return -1; |
| 101 | }; |
| 102 | |
| 103 | const rank = (o, query) => ranked(o, fold(query)); |
| 104 | |
| 105 | // order returns the options a query matches, best first. Among EXACT matches |
| 106 | // (rank 0 — a calling code typed whole) an option marked `first` (data-rst-first) leads — the country that owns |
| 107 | // a shared calling code, so "+1" opens on the United States rather than on |
| 108 | // American Samoa — and after that ties keep the options' own order, which is |
| 109 | // the page's own (or the alphabet's). |
| 110 | const order = (opts, query) => { |
| 111 | const q = fold(query); |
| 112 | return opts |
| 113 | .map((o, i) => ({ o, i, r: ranked(o, q) })) |
| 114 | .filter((x) => x.r >= 0) |
| 115 | .sort((a, b) => a.r - b.r || (a.r === 0 ? (b.o.first ? 1 : 0) - (a.o.first ? 1 : 0) : 0) || a.i - b.i) |
| 116 | .map((x) => x.o); |
| 117 | }; |
| 118 | |
| 119 | // settle is the match that LEAVING the box after a search commits, or null: |
| 120 | // the one row a search can only mean. hits are order()'s answer. |
| 121 | // - a single match settles; |
| 122 | // - a calling code typed whole whose best row owns it settles, with or |
| 123 | // without its "+" ("+44" and "44" are the United Kingdom, "1" the US); |
| 124 | // - on three or more characters, the best row settles when it is the ONLY |
| 125 | // row that good: an exact hit ("germany"), or a name that starts with |
| 126 | // the query when nothing else does ("ger" is Germany; Algeria and Niger |
| 127 | // only contain it). "ind" settles nothing: India and Indonesia tie, and |
| 128 | // neither does an exact hit two rows share. |
| 129 | // Two letters alone never settle: "ge" is Georgia's code and the start of |
| 130 | // Germany, and a wrong calling code under a phone number is worse than an |
| 131 | // unpicked box the form then asks about. |
| 132 | const settle = (hits, query) => { |
| 133 | if (hits.length === 1) return hits[0]; |
| 134 | if (!hits.length) return null; |
| 135 | const q = fold(query); |
| 136 | const bare = q.replace(/^\+/, ""); |
| 137 | const r0 = rank(hits[0], query); |
| 138 | if (r0 === 0 && /^\d+$/.test(bare) && hits[0].first) return hits[0]; |
| 139 | if (bare.length < 3 || /^\d+$/.test(bare)) return null; |
| 140 | // An exact hit settles only when it is the single best row: nothing else |
| 141 | // is exact, or of the exact ties it alone is marked first. Two places |
| 142 | // named alike ("springfield" is exactly both "Springfield (IL)" and |
| 143 | // "Springfield (MA)", the bracket being a gloss) are two answers, and |
| 144 | // leaving the box commits neither. Kept byte for byte with Tito Go's. |
| 145 | if (r0 === 0) { |
| 146 | const ties = hits.filter((o) => ranked(o, q) === 0); |
| 147 | if (ties.length === 1) return hits[0]; |
| 148 | return hits[0].first && ties.filter((o) => o.first).length === 1 ? hits[0] : null; |
| 149 | } |
| 150 | return r0 < rank(hits[1], query) ? hits[0] : null; |
| 151 | }; |
| 152 | |
| 153 | // isPrompt says whether an option is a PROMPT rather than an answer: one the |
| 154 | // page marked data-rst-prompt (a phone number's "Country"), or the blank of a |
| 155 | // REQUIRED select ("Choose one" over the country question). A prompt is never |
| 156 | // shown as the pick — the box stays empty so its placeholder ("Search |
| 157 | // countries") says what is wanted — and a required select never offers its |
| 158 | // blank as a row: choosing it would only leave the question unanswered. An optional select's blank |
| 159 | // ("No answer") is a real answer and is neither. |
| 160 | // A DISABLED blank is never an answer either, required or not: a page that |
| 161 | // renders "Choose one" disabled means it, and a select that stops being |
| 162 | // required (a sibling script unticking a box) must not bring it back as a |
| 163 | // pick. |
| 164 | const isPrompt = (value, marked, required, disabled) => |
| 165 | marked || (value === "" && (required || !!disabled)); |
| 166 | |
| 167 | // offered says whether a blank option is listed. A MARKED prompt (a phone |
| 168 | // number's "Country") is listed while nothing is typed and drops out once |
| 169 | // something is — required or not, exactly as before. An unmarked blank on a |
| 170 | // required select is never listed. Any other blank ("No answer") always is. |
| 171 | const offered = (value, marked, required, searching, disabled) => |
| 172 | value !== "" || (marked ? !searching : !(required || !!disabled)); |
| 173 | |
| 174 | // The pure half, for ui/select_node.mjs. A browser has no `module` and |
| 175 | // never takes this branch. |
| 176 | if (typeof module !== "undefined" && module && module.exports) { |
| 177 | module.exports = { fold: fold, rank: rank, order: order, settle: settle, isPrompt: isPrompt, offered: offered }; |
| 178 | } |
| 179 | if (typeof document === "undefined") return; |
| 180 | |
| 181 | // The band of this document the reader can see, when a host says so: |
| 182 | // {top, bottom} in viewport coordinates. A frame's visual viewport never |
| 183 | // shrinks for the top page's keyboard, so a host that can see it tells |
| 184 | // the frame; null forgets it. Registered before any box opens, so a box |
| 185 | // re-placing on the same event reads the new band. |
| 186 | let told = null; |
| 187 | document.addEventListener("rst:select-viewport", (e) => { |
| 188 | const d = e.detail; |
| 189 | told = d && isFinite(d.top) && isFinite(d.bottom) ? { top: +d.top, bottom: +d.bottom } : null; |
| 190 | }); |
| 191 | |
| 192 | const ACTS = new Set(["ArrowDown", "ArrowUp", "Home", "End", "Enter", "Tab"]); |
| 193 | |
| 194 | const el = (tag, attr) => { |
| 195 | const e = document.createElement(tag); |
| 196 | if (attr) e.setAttribute(attr, ""); |
| 197 | return e; |
| 198 | }; |
| 199 | |
| 200 | // A <select> with too many options to scan by eye becomes a filterable |
| 201 | // combobox — but the <select> itself never leaves the DOM. It is |
| 202 | // visually hidden and mirrored, so form submission, required |
| 203 | // validation, reset and autofill all keep working on the element they |
| 204 | // always did. The select is the single source of truth; if this never |
| 205 | // runs, the user gets an ordinary native select. |
| 206 | // resume, when a box is rebuilt in place, is where the old one was: |
| 207 | // {focused, open, typed}. It is restored quietly — no input event for a |
| 208 | // page to answer by changing the options again, and no reopening a list |
| 209 | // somebody had closed. |
| 210 | const enhanced = new WeakSet(); |
| 211 | function combo(native, resume) { |
| 212 | // Idempotent, by a live record rather than the attribute: a page that |
| 213 | // replaces a select with a clone of it copies data-rst-enhanced too, |
| 214 | // and a clone trusted on that would never be enhanced at all. |
| 215 | if (enhanced.has(native)) return; |
| 216 | enhanced.add(native); |
| 217 | native.dataset.rstEnhanced = "true"; |
| 218 | |
| 219 | const id = native.id || "rst-select-" + Math.random().toString(36).slice(2); |
| 220 | const listId = id + "-listbox"; |
| 221 | const say = (key, fallback) => native.getAttribute("data-rst-select-" + key) || fallback; |
| 222 | const manyFmt = say("results", "{n} results"); |
| 223 | const oneFmt = say("result-one", "1 result"); |
| 224 | |
| 225 | // The option model mirrors the live select, index for index, so a row |
| 226 | // and select.selectedIndex always agree. Groups are kept: each option |
| 227 | // knows the list it belongs in, and a search that lifts it out puts |
| 228 | // it back there. |
| 229 | const groups = []; |
| 230 | const opts = Array.from(native.options).map((o, i) => { |
| 231 | const d = o.dataset; |
| 232 | const g = o.parentElement.tagName === "OPTGROUP" ? o.parentElement : null; |
| 233 | if (g && groups[groups.length - 1] !== g) groups.push(g); |
| 234 | return { |
| 235 | text: o.text, |
| 236 | name: d.rstName || o.text, |
| 237 | desc: d.rstDesc || "", |
| 238 | short: d.rstShort || "", |
| 239 | lead: d.rstLead || "", |
| 240 | terms: (d.rstTerms || "").split(/\s+/).filter(Boolean), |
| 241 | marked: d.rstPrompt !== undefined, |
| 242 | // Whether it is a prompt can change: a sibling script may stop the |
| 243 | // select being required, so the observer below re-derives it. |
| 244 | prompt: isPrompt(o.value, d.rstPrompt !== undefined, native.required, o.disabled), |
| 245 | first: d.rstFirst !== undefined, |
| 246 | sepBefore: !!(o.previousElementSibling && o.previousElementSibling.tagName === "HR"), |
| 247 | disabled: o.disabled, |
| 248 | blank: o.value === "", |
| 249 | index: i, |
| 250 | group: g, |
| 251 | // The native option itself, read live: an app that removes or |
| 252 | // reorders options after enhancement moves every index, and a |
| 253 | // cached one would submit a different option from the row chosen. |
| 254 | el: o, |
| 255 | li: null, |
| 256 | }; |
| 257 | }); |
| 258 | for (const o of opts) o.folded = folded(o); |
| 259 | const compact = opts.some((o) => o.short); |
| 260 | |
| 261 | const wrap = el("div", "rst-combo"); |
| 262 | if (compact) wrap.setAttribute("rst-combo-compact", ""); |
| 263 | // The pick's glyph, drawn before the box. Decorative: the description |
| 264 | // below is what says which option it is. |
| 265 | const lead = el("span", "rst-combo-lead"); |
| 266 | lead.setAttribute("aria-hidden", "true"); |
| 267 | // The whole name of a compact pick, for a screen reader only: a box |
| 268 | // showing "+44" is described as "United Kingdom +44". |
| 269 | const said = el("span"); |
| 270 | said.id = id + "-said"; |
| 271 | said.hidden = true; |
| 272 | |
| 273 | const input = el("input", "rst-input"); |
| 274 | input.type = "text"; |
| 275 | input.id = id + "-combo"; |
| 276 | input.autocomplete = "off"; |
| 277 | input.spellcheck = false; |
| 278 | // A compact box is too narrow for a search sentence, so it says what |
| 279 | // it is for in the one word it is labelled with. |
| 280 | input.placeholder = compact && native.getAttribute("aria-label") |
| 281 | ? native.getAttribute("aria-label") |
| 282 | : say("filter", "Type to filter"); |
| 283 | input.setAttribute("role", "combobox"); |
| 284 | input.setAttribute("aria-expanded", "false"); |
| 285 | input.setAttribute("aria-controls", listId); |
| 286 | input.setAttribute("aria-autocomplete", "list"); |
| 287 | const described = native.getAttribute("aria-describedby"); |
| 288 | if (described) input.setAttribute("aria-describedby", described); |
| 289 | if (compact) input.setAttribute("aria-describedby", described ? described + " " + said.id : said.id); |
| 290 | |
| 291 | const list = el("ul", "rst-combo-list"); |
| 292 | list.id = listId; |
| 293 | list.hidden = true; |
| 294 | list.setAttribute("role", "listbox"); |
| 295 | |
| 296 | const status = el("p"); |
| 297 | status.className = "rst-sr-only"; |
| 298 | status.setAttribute("role", "status"); |
| 299 | status.setAttribute("aria-live", "polite"); |
| 300 | |
| 301 | // The label named the select; it now names the control the user |
| 302 | // actually types into, and the list too. |
| 303 | const label = native.id && document.querySelector('label[for="' + CSS.escape(native.id) + '"]'); |
| 304 | if (label) { |
| 305 | if (!label.id) label.id = id + "-label"; |
| 306 | label.htmlFor = input.id; |
| 307 | list.setAttribute("aria-labelledby", label.id); |
| 308 | } else if (native.getAttribute("aria-label")) { |
| 309 | input.setAttribute("aria-label", native.getAttribute("aria-label")); |
| 310 | list.setAttribute("aria-label", native.getAttribute("aria-label")); |
| 311 | } |
| 312 | |
| 313 | // Each group is a labelled box in the list. The group's name lives on |
| 314 | // aria-label, so the heading inside is furniture — hidden from the |
| 315 | // accessibility tree and out of the keyboard order. <li> cannot hold |
| 316 | // <li>, so its rows nest in a list of their own with role=none. |
| 317 | const boxes = new Map(); |
| 318 | for (const g of groups) { |
| 319 | const box = el("li"); |
| 320 | box.setAttribute("role", "group"); |
| 321 | box.setAttribute("aria-label", g.label); |
| 322 | const rows = el("ul", "rst-combo-rows"); |
| 323 | rows.setAttribute("role", "none"); |
| 324 | const head = el("li", "rst-select-group"); |
| 325 | head.setAttribute("aria-hidden", "true"); |
| 326 | head.textContent = g.label; |
| 327 | rows.appendChild(head); |
| 328 | box.appendChild(rows); |
| 329 | boxes.set(g, { box, rows }); |
| 330 | } |
| 331 | const home = (o) => (o.group ? boxes.get(o.group).rows : list); |
| 332 | |
| 333 | for (const o of opts) { |
| 334 | const li = el("li", "rst-combo-option"); |
| 335 | li.id = listId + "-" + o.index; |
| 336 | li.setAttribute("role", "option"); |
| 337 | li.setAttribute("aria-selected", "false"); |
| 338 | if (o.disabled) li.setAttribute("aria-disabled", "true"); |
| 339 | if (o.lead) { |
| 340 | const glyph = el("span", "rst-combo-lead"); |
| 341 | glyph.setAttribute("aria-hidden", "true"); |
| 342 | glyph.textContent = o.lead; |
| 343 | li.append(glyph); |
| 344 | } |
| 345 | if (o.desc) { |
| 346 | // Two spans rather than the option's one string: the brackets are |
| 347 | // for a reader without JavaScript, and here a quieter colour does |
| 348 | // that job with no punctuation for a locale to argue with. |
| 349 | const name = el("span", "rst-combo-name"); |
| 350 | name.textContent = o.name; |
| 351 | const desc = el("span", "rst-combo-desc"); |
| 352 | desc.textContent = o.desc; |
| 353 | li.append(name, desc); |
| 354 | } else { |
| 355 | li.append(o.text); |
| 356 | } |
| 357 | o.li = li; |
| 358 | if (o.group && !list.contains(boxes.get(o.group).box)) list.appendChild(boxes.get(o.group).box); |
| 359 | if (o.sepBefore) { |
| 360 | o.sep = el("li", "rst-combo-sep"); |
| 361 | o.sep.setAttribute("aria-hidden", "true"); |
| 362 | home(o).appendChild(o.sep); |
| 363 | } |
| 364 | home(o).appendChild(li); |
| 365 | } |
| 366 | const empty = el("li", "rst-combo-empty"); |
| 367 | empty.style.display = "none"; |
| 368 | empty.textContent = say("no-matches", "No matches"); |
| 369 | list.appendChild(empty); |
| 370 | |
| 371 | native.parentNode.insertBefore(wrap, native); |
| 372 | wrap.append(lead, input, said, list, status); |
| 373 | // Drop [rst-input] too: its width:100% would otherwise leave the hidden |
| 374 | // select a full-width box held out of sight by clip-path alone. |
| 375 | const inputAttr = native.getAttribute("rst-input"); |
| 376 | native.removeAttribute("rst-input"); |
| 377 | native.classList.add("rst-sr-only"); |
| 378 | native.setAttribute("tabindex", "-1"); |
| 379 | native.setAttribute("aria-hidden", "true"); |
| 380 | |
| 381 | let open = false; |
| 382 | // The highlighted row itself, not an index: an extra row is in `opts` |
| 383 | // but has no index in the select. |
| 384 | let active = null; |
| 385 | let extras = 0; |
| 386 | |
| 387 | // The selection as the select itself reports it: an option removed after |
| 388 | // enhancement keeps `selected` set, so it is never asked directly. |
| 389 | const selectedEl = () => native.options[native.selectedIndex] || null; |
| 390 | const picked = () => opts.find((o) => o.el && o.el === selectedEl()) || null; |
| 391 | // A prompt is not an answer, so the closed box shows nothing for it and |
| 392 | // its placeholder says what is wanted. |
| 393 | const currentText = () => { |
| 394 | const o = picked(); |
| 395 | return o && !o.prompt ? o.short || o.name : ""; |
| 396 | }; |
| 397 | // Whether the box shows the pick or words somebody typed: an open |
| 398 | // list refreshed from outside (a required flip, new extras) searches |
| 399 | // for the typed words, never for the pick's own text. |
| 400 | let showingPick = true; |
| 401 | const showText = () => { |
| 402 | input.value = currentText(); |
| 403 | showingPick = true; |
| 404 | }; |
| 405 | const query = () => (showingPick ? "" : input.value); |
| 406 | const showPick = () => { |
| 407 | const o = picked(); |
| 408 | lead.textContent = (o && o.lead) || ""; |
| 409 | lead.hidden = !lead.textContent; |
| 410 | if (wrap.hasAttribute("rst-combo-has-lead") === lead.hidden) wrap.toggleAttribute("rst-combo-has-lead", !lead.hidden); |
| 411 | said.textContent = o && o.short ? [o.name, o.desc].filter(Boolean).join(" ") : ""; |
| 412 | }; |
| 413 | showText(); |
| 414 | showPick(); |
| 415 | |
| 416 | // The row that LEAVING the box after typing takes (Tab, or a tap |
| 417 | // elsewhere), or null: settle() says which searches can only mean one |
| 418 | // row. A row somebody ARROWED to is their choice, as on a native select. |
| 419 | let steered = false; |
| 420 | const settledPick = () => { |
| 421 | if (!open || !active || active.run) return null; |
| 422 | if (steered) return active.el === selectedEl() ? null : active; |
| 423 | if (input.value === currentText()) return null; |
| 424 | const pick = settle(lastHits, input.value); |
| 425 | return pick && pick === (lastHits.length === 1 ? pick : active) ? pick : null; |
| 426 | }; |
| 427 | |
| 428 | // The rows in the order they are on screen: best match first while |
| 429 | // searching, the select's own order otherwise; the page's extras last. |
| 430 | let shown = opts; |
| 431 | const isShown = (e) => e.style.display !== "none"; |
| 432 | const visible = () => shown.filter((o) => isShown(o.li) && !o.disabled); |
| 433 | // What a list falls back to highlighting: one of the select's own |
| 434 | // answers — never a row the page added (it owns Enter), and never a |
| 435 | // prompt (a bare Enter would "answer" with the question). |
| 436 | const firstReal = () => visible().find((o) => !o.run && !o.prompt) || null; |
| 437 | const unanswered = () => { |
| 438 | const sel = picked(); |
| 439 | // Nothing selected at all (selectedIndex -1) is unanswered too. |
| 440 | return !sel || sel.prompt; |
| 441 | }; |
| 442 | // The row an idle list highlights: the pick on an answered box, nothing |
| 443 | // on an unanswered one — highlighting the first row would let a bare |
| 444 | // Enter answer the question with whatever happens to sort first. A |
| 445 | // cleared search lands where opening does, so an idle list reads one |
| 446 | // way however it got there. |
| 447 | const opening = () => { |
| 448 | if (unanswered()) return null; |
| 449 | const sel = picked(); |
| 450 | return sel && isShown(sel.li) && !sel.disabled ? sel : firstReal(); |
| 451 | }; |
| 452 | // The rows the arrows, Home and End step through: what is on screen, |
| 453 | // less a prompt, which is still there to tap. |
| 454 | const steps = () => visible().filter((o) => !o.prompt); |
| 455 | |
| 456 | // Everything that reads layout — where the box sits, how much room is |
| 457 | // above and below it, scrolling the highlight into view — happens at |
| 458 | // most once a frame, in one callback. A keystroke that searched twice |
| 459 | // in a frame used to force layout twice, on a long form with several |
| 460 | // boxes, on a phone: the "slow typing" was reflow. |
| 461 | let layout = 0; |
| 462 | let placeDue = false; |
| 463 | let scrollTo = null; |
| 464 | let scrollTop = false; |
| 465 | const onLayout = () => { |
| 466 | layout = 0; |
| 467 | if (!open) return; |
| 468 | if (placeDue) place(); |
| 469 | placeDue = false; |
| 470 | if (scrollTop) list.scrollTop = 0; |
| 471 | else if (scrollTo && isShown(scrollTo.li)) scrollTo.li.scrollIntoView({ block: "nearest" }); |
| 472 | scrollTo = null; |
| 473 | scrollTop = false; |
| 474 | }; |
| 475 | const soon = () => { |
| 476 | if (!layout) layout = requestAnimationFrame(onLayout); |
| 477 | }; |
| 478 | // Down, unless the room below cannot hold the list's own height (its |
| 479 | // stylesheet max-height) and there is more room above; then up, so a box |
| 480 | // at the foot of a sheet does not open under a phone's keyboard. Held to |
| 481 | // the room on its side. Room is the visual viewport, cut to every |
| 482 | // ancestor that scrolls. Only placement flips, never keyboard order or |
| 483 | // ARIA. The same rule as Tito Go's searchselect. Worked out when the list opens and when the room |
| 484 | // changes — never on a keystroke: the room is the same whatever is |
| 485 | // typed, and a keystroke's one layout read is the highlight's. |
| 486 | // Measured with nothing of ours on the list — once per open, and again |
| 487 | // after a window resize, which may be text made bigger: its stylesheet |
| 488 | // height and its gap off the box. |
| 489 | let preferred = 0; |
| 490 | let gap = 0; |
| 491 | let chrome = 0; // padding and borders outside a content-box max-height |
| 492 | let scrollers = []; |
| 493 | let floors = []; |
| 494 | const place = () => { |
| 495 | if (!preferred) { |
| 496 | // Read with nothing of ours in the way: an upward list has no top |
| 497 | // margin, and the gap would read as 0. |
| 498 | if (wrap.hasAttribute("rst-combo-up")) wrap.removeAttribute("rst-combo-up"); |
| 499 | list.style.maxBlockSize = ""; |
| 500 | const cs = getComputedStyle(list); |
| 501 | preferred = parseFloat(cs.maxBlockSize) || 240; |
| 502 | gap = parseFloat(cs.marginTop) || 0; |
| 503 | chrome = cs.boxSizing === "border-box" ? 0 : ["paddingTop", "paddingBottom", "borderTopWidth", "borderBottomWidth"].reduce((n, k) => n + (parseFloat(cs[k]) || 0), 0); |
| 504 | } |
| 505 | const vv = window.visualViewport; |
| 506 | let top = vv ? vv.offsetTop : 0; |
| 507 | let bottom = vv ? vv.offsetTop + vv.height : window.innerHeight; |
| 508 | if (told) { |
| 509 | top = Math.max(top, told.top); |
| 510 | bottom = Math.min(bottom, told.bottom); |
| 511 | } |
| 512 | for (const a of scrollers) { |
| 513 | const r = a.getBoundingClientRect(); |
| 514 | top = Math.max(top, r.top); |
| 515 | bottom = Math.min(bottom, r.bottom); |
| 516 | } |
| 517 | const box = wrap.getBoundingClientRect(); |
| 518 | // A bar pinned below the box (data-rst-select-floor) is not room; |
| 519 | // the highest wins, one above the box is ignored. |
| 520 | for (const f of floors) { |
| 521 | const r = f.getBoundingClientRect(); |
| 522 | if (r.height && r.top >= box.bottom - 1) bottom = Math.min(bottom, r.top); |
| 523 | } |
| 524 | const below = bottom - box.bottom - gap; |
| 525 | const above = box.top - top - gap; |
| 526 | // Up only when the list does not fit below and there is more room |
| 527 | // above; a tie goes down. Neither fitting, the bigger side wins and |
| 528 | // the list is clamped to it, never past the edge (Tito Go #3146). |
| 529 | const up = below < preferred + chrome && above > below; |
| 530 | const h = Math.floor(Math.max(0, Math.min(preferred + chrome, up ? above : below) - chrome)) + "px"; |
| 531 | if (list.style.maxBlockSize !== h) list.style.maxBlockSize = h; |
| 532 | if (up !== wrap.hasAttribute("rst-combo-up")) wrap.toggleAttribute("rst-combo-up", up); |
| 533 | }; |
| 534 | const replace = (e) => { |
| 535 | // A box taken off the page with its whole fragment hears no mutation |
| 536 | // and may get no blur; the first event after drops the page-wide |
| 537 | // listeners that would otherwise keep it alive. |
| 538 | if (!wrap.isConnected) return closeList(false); |
| 539 | if (e && e.type === "resize" && e.currentTarget === window) preferred = 0; |
| 540 | placeDue = true; |
| 541 | soon(); |
| 542 | }; |
| 543 | // A panel or sheet around the box scrolling moves it as surely as the |
| 544 | // window does; the list's own scrolling does not. |
| 545 | const scrolled = (e) => { |
| 546 | if (e.target !== list) replace(); |
| 547 | }; |
| 548 | const setActive = (o, atTop) => { |
| 549 | // Only the row losing the highlight and the row gaining it are touched. |
| 550 | // Every write here is guarded: rewriting an attribute to the value it |
| 551 | // has is still a mutation the page's stylesheet is asked about. |
| 552 | if (active && active !== o) active.li.classList.remove("is-active"); |
| 553 | if (o && !o.li.classList.contains("is-active")) o.li.classList.add("is-active"); |
| 554 | active = o || null; |
| 555 | if (o) { |
| 556 | if (input.getAttribute("aria-activedescendant") !== o.li.id) input.setAttribute("aria-activedescendant", o.li.id); |
| 557 | scrollTop = !!(atTop && visible()[0] === o); |
| 558 | scrollTo = o; |
| 559 | soon(); |
| 560 | } else if (input.hasAttribute("aria-activedescendant")) { |
| 561 | input.removeAttribute("aria-activedescendant"); |
| 562 | } |
| 563 | }; |
| 564 | |
| 565 | // A prompt is never selected: a listbox announcing a selected option |
| 566 | // says somebody answered the question. |
| 567 | const markSelected = () => { |
| 568 | for (const o of opts) { |
| 569 | const v = o.el && o.el === selectedEl() && !o.prompt ? "true" : "false"; |
| 570 | if (o.li.getAttribute("aria-selected") !== v) o.li.setAttribute("aria-selected", v); |
| 571 | } |
| 572 | }; |
| 573 | |
| 574 | // A burst of typing is searched twice a frame at most, however many |
| 575 | // input events it fires: a phone keyboard can fire several inside one |
| 576 | // frame (predictive text, autocorrect) and only the last is ever seen. |
| 577 | // The FIRST input of a frame is searched at once, so a single keystroke |
| 578 | // reads exactly as it always did; any more only mark the search stale, |
| 579 | // and it runs once before the frame is drawn. Anything that ACTS on the |
| 580 | // list (Enter, the arrows, Tab, leaving) catches it up first (flush), |
| 581 | // so typing then pressing Enter takes the row for the words typed. |
| 582 | let pending = false; |
| 583 | let frame = 0; |
| 584 | let lastQuery = null; |
| 585 | let lastHits = []; |
| 586 | // Rows a search has lifted to the top of the list, out of their own |
| 587 | // place. Only these ever go back when the search is cleared. |
| 588 | const lifted = new Set(); |
| 589 | // Where a row stands with no search: before its successor in the same |
| 590 | // list, or last in its group, or before the next group or the empty row. |
| 591 | const anchorAfter = (o) => { |
| 592 | const next = opts[o.index + 1]; |
| 593 | if (next && !next.run && next.group === o.group) return next.sep || next.li; |
| 594 | if (o.group) return null; |
| 595 | if (next && !next.run) return next.group ? boxes.get(next.group).box : next.sep || next.li; |
| 596 | return empty; |
| 597 | }; |
| 598 | // A row's shown state, written only when it changes, as an inline |
| 599 | // `display`, never the `hidden` attribute: a page with [hidden] inside a |
| 600 | // :has() makes each such write a style invalidation WebKit works out on |
| 601 | // the spot, and one keystroke hides hundreds of rows (3 to 6 seconds on |
| 602 | // an iPhone, on Tito's checkout). No page's CSS asks about inline style. |
| 603 | const show = (e, on) => { |
| 604 | if (isShown(e) !== on) e.style.display = on ? "" : "none"; |
| 605 | }; |
| 606 | const filter = (query) => { |
| 607 | pending = false; |
| 608 | const own = opts.filter((o) => !o.run); |
| 609 | const searching = fold(query) !== ""; |
| 610 | // A blank that is a prompt is never an answer: a required select never |
| 611 | // lists its blank, and a marked prompt drops out once something is |
| 612 | // typed. An optional select's "No answer" is a real answer. |
| 613 | const answerable = (o) => |
| 614 | !o.blank || offered(o.el.value, o.marked, native.required, searching, o.disabled); |
| 615 | const hits = order(own.filter(answerable), query); |
| 616 | lastHits = hits.filter((o) => !o.disabled); |
| 617 | const hit = new Set(hits); |
| 618 | const extra = opts.filter((o) => o.run); |
| 619 | shown = searching ? [...hits, ...own.filter((o) => !hit.has(o)), ...extra] : opts; |
| 620 | const tail = extra.length ? extra[0].li : null; |
| 621 | if (empty.nextSibling !== tail || empty.parentNode !== list) list.insertBefore(empty, tail); |
| 622 | // What a keystroke costs is what it MOVES. A search lays out only its |
| 623 | // hits, best first, at the top of the list; a row it hides stays where |
| 624 | // it is, because a hidden row's place is never seen. A hit already |
| 625 | // next in line is not moved, so narrowing a search moves almost |
| 626 | // nothing. Clearing puts back only the rows a search lifted. |
| 627 | if (searching) { |
| 628 | const hitRow = new Set(hits.map((o) => o.li)); |
| 629 | let ref = list.firstChild; |
| 630 | for (const o of hits) { |
| 631 | // Never past the empty row (before the extras): a grouped hit is |
| 632 | // not a list child, and would land after the extras. |
| 633 | while (ref && ref !== empty && ref !== o.li && !hitRow.has(ref)) ref = ref.nextSibling; |
| 634 | if (ref === o.li) { |
| 635 | ref = ref.nextSibling; |
| 636 | } else { |
| 637 | list.insertBefore(o.li, ref); |
| 638 | lifted.add(o); |
| 639 | } |
| 640 | } |
| 641 | } else if (lifted.size) { |
| 642 | // Highest index first, so each row's successor is home before it. |
| 643 | for (const o of [...lifted].sort((a, b) => b.index - a.index)) home(o).insertBefore(o.li, anchorAfter(o)); |
| 644 | lifted.clear(); |
| 645 | } |
| 646 | for (const o of own) { |
| 647 | show(o.li, hit.has(o)); |
| 648 | if (o.sep) show(o.sep, !searching); |
| 649 | } |
| 650 | for (const { box } of boxes.values()) show(box, !searching); |
| 651 | for (const o of extra) show(o.li, true); |
| 652 | const found = hits.filter((o) => !o.disabled).length; |
| 653 | show(empty, !found); |
| 654 | const text = found === 1 ? oneFmt : manyFmt.replace("{n}", String(found)); |
| 655 | if (status.textContent !== text) status.textContent = text; |
| 656 | // A NEW query re-ranks the list, so its best match is the one Enter |
| 657 | // takes. The same query run again (the page handing over fresh |
| 658 | // extras) keeps a row somebody arrowed to, if it is still there. |
| 659 | const requeried = query !== lastQuery; |
| 660 | if (requeried) steered = false; |
| 661 | lastQuery = query; |
| 662 | if (!searching && !steered && (requeried || unanswered())) setActive(opening()); |
| 663 | else if ((searching && requeried) || !active || !shown.includes(active) || !isShown(active.li) || active.disabled) { |
| 664 | setActive(firstReal(), true); |
| 665 | } |
| 666 | }; |
| 667 | const flush = () => { |
| 668 | if (pending && open) filter(input.value); |
| 669 | }; |
| 670 | const onFrame = () => { |
| 671 | frame = 0; |
| 672 | flush(); |
| 673 | }; |
| 674 | const searchTyping = () => { |
| 675 | if (frame) { |
| 676 | pending = true; |
| 677 | return; |
| 678 | } |
| 679 | frame = requestAnimationFrame(onFrame); |
| 680 | filter(input.value); |
| 681 | }; |
| 682 | |
| 683 | const openList = (showAll) => { |
| 684 | if (open) return; |
| 685 | open = true; |
| 686 | list.hidden = false; |
| 687 | input.setAttribute("aria-expanded", "true"); |
| 688 | // The ancestors that scroll, read once a list opens: which they are |
| 689 | // does not change while it is open. |
| 690 | scrollers = []; |
| 691 | for (let a = wrap.parentElement; a && a !== document.body; a = a.parentElement) { |
| 692 | if (/auto|scroll|hidden|clip/.test(getComputedStyle(a).overflowY)) scrollers.push(a); |
| 693 | } |
| 694 | floors = [...document.querySelectorAll("[data-rst-select-floor]")]; |
| 695 | preferred = 0; |
| 696 | replace(); |
| 697 | window.addEventListener("resize", replace); |
| 698 | document.addEventListener("rst:select-viewport", replace); |
| 699 | document.addEventListener("scroll", scrolled, true); |
| 700 | if (window.visualViewport) { |
| 701 | window.visualViewport.addEventListener("resize", replace); |
| 702 | window.visualViewport.addEventListener("scroll", replace); |
| 703 | } |
| 704 | if (showAll) filter(""); |
| 705 | markSelected(); |
| 706 | setActive(opening()); |
| 707 | }; |
| 708 | |
| 709 | const closeList = (revert) => { |
| 710 | if (!open) return; |
| 711 | open = false; |
| 712 | list.hidden = true; |
| 713 | window.removeEventListener("resize", replace); |
| 714 | document.removeEventListener("rst:select-viewport", replace); |
| 715 | document.removeEventListener("scroll", scrolled, true); |
| 716 | if (window.visualViewport) { |
| 717 | window.visualViewport.removeEventListener("resize", replace); |
| 718 | window.visualViewport.removeEventListener("scroll", replace); |
| 719 | } |
| 720 | input.setAttribute("aria-expanded", "false"); |
| 721 | input.removeAttribute("aria-activedescendant"); |
| 722 | // Typing not yet searched dies with the list, and so does the frame |
| 723 | // that would have searched it — or the next keystroke, reopening the |
| 724 | // list, would count as the second of that frame and show the old |
| 725 | // search's rows against the new words. |
| 726 | pending = false; |
| 727 | cancelAnimationFrame(frame); |
| 728 | frame = 0; |
| 729 | // A search closed is a search over: the next one, even with the same |
| 730 | // words, is a new query, so it re-ranks (Enter takes its best match, |
| 731 | // not a row the old one left highlighted) and clears steering, or |
| 732 | // leaving would commit a row somebody arrowed to in a search they |
| 733 | // cancelled. Every way back into the list runs filter, so this one |
| 734 | // reset carries both; a separate `steered = false` here could never |
| 735 | // be observed, and a line no test can see go wrong is not kept. |
| 736 | lastQuery = null; |
| 737 | if (active) active.li.classList.remove("is-active"); |
| 738 | if (revert) { |
| 739 | showText(); |
| 740 | showPick(); |
| 741 | } |
| 742 | }; |
| 743 | |
| 744 | const choose = (o) => { |
| 745 | if (!o || o.disabled) return; |
| 746 | // An extra row does something instead of BEING something: there is |
| 747 | // nothing to select, and the page decides what happens to the text. |
| 748 | if (o.run) { |
| 749 | o.run(); |
| 750 | return; |
| 751 | } |
| 752 | // A row whose option the page has since removed selects nothing. |
| 753 | if (!native.contains(o.el)) { |
| 754 | closeList(true); |
| 755 | return; |
| 756 | } |
| 757 | o.el.selected = true; |
| 758 | // Mirror onto the real control, so a listener the app attached to the |
| 759 | // select still fires. |
| 760 | native.dispatchEvent(new Event("change", { bubbles: true })); |
| 761 | showText(); |
| 762 | showPick(); |
| 763 | markSelected(); |
| 764 | closeList(false); |
| 765 | }; |
| 766 | |
| 767 | let resuming = false; |
| 768 | input.addEventListener("focus", () => { |
| 769 | if (resuming) return; |
| 770 | // Select the pick so the first keystroke replaces it; otherwise typing |
| 771 | // into "Option 1" searches for "Option 1O". |
| 772 | input.select(); |
| 773 | openList(true); |
| 774 | }); |
| 775 | input.addEventListener("click", () => openList(true)); |
| 776 | input.addEventListener("input", () => { |
| 777 | showingPick = false; |
| 778 | // Once somebody types, the box holds their words, not the pick. |
| 779 | // Written once, not per keystroke (see show, below). |
| 780 | if (!lead.hidden) { |
| 781 | lead.hidden = true; |
| 782 | wrap.removeAttribute("rst-combo-has-lead"); |
| 783 | } |
| 784 | openList(false); |
| 785 | searchTyping(); |
| 786 | }); |
| 787 | |
| 788 | // Whether this keystroke's keydown took Enter for the list: see the |
| 789 | // keypress guard below. |
| 790 | let tookEnter = false; |
| 791 | input.addEventListener("keydown", (e) => { |
| 792 | tookEnter = false; |
| 793 | if (ACTS.has(e.key)) flush(); |
| 794 | switch (e.key) { |
| 795 | case "ArrowDown": { |
| 796 | e.preventDefault(); |
| 797 | if (!open) return openList(true); |
| 798 | const v = steps(); |
| 799 | steered = true; |
| 800 | setActive(v[Math.min(v.indexOf(active) + 1, v.length - 1)] || v[0] || null); |
| 801 | break; |
| 802 | } |
| 803 | case "ArrowUp": { |
| 804 | e.preventDefault(); |
| 805 | if (!open) return openList(true); |
| 806 | const v = steps(); |
| 807 | steered = true; |
| 808 | // From nothing highlighted, Up goes to the LAST row, as a native |
| 809 | // select and the APG combobox pattern do. |
| 810 | setActive((active ? v[Math.max(v.indexOf(active) - 1, 0)] : v[v.length - 1]) || null); |
| 811 | break; |
| 812 | } |
| 813 | case "Home": |
| 814 | case "End": |
| 815 | if (open) { |
| 816 | e.preventDefault(); |
| 817 | steered = true; |
| 818 | const v = steps(); |
| 819 | setActive((e.key === "Home" ? v[0] : v[v.length - 1]) || null); |
| 820 | } |
| 821 | break; |
| 822 | case "Enter": |
| 823 | // With the list open, Enter belongs to the list: it picks the |
| 824 | // highlighted row, and with none it does nothing. It never submits |
| 825 | // the form from under an open list, which would post whatever the |
| 826 | // select held before the person chose. |
| 827 | if (open) { |
| 828 | e.preventDefault(); |
| 829 | tookEnter = true; |
| 830 | if (active) choose(active); |
| 831 | } |
| 832 | break; |
| 833 | case "Escape": |
| 834 | if (open) { |
| 835 | // This Escape was for the list; something further up (a dialog) |
| 836 | // must not take it as its own and close with the choice half made. |
| 837 | e.preventDefault(); |
| 838 | e.stopPropagation(); |
| 839 | closeList(true); |
| 840 | } |
| 841 | break; |
| 842 | case "Tab": |
| 843 | // Somebody who typed "irel", sees Ireland highlighted and tabs on |
| 844 | // means Ireland, as a native select commits its type-ahead on Tab. |
| 845 | // With nothing typed, Tab only leaves. Escape reverts. |
| 846 | if (settledPick()) choose(settledPick()); |
| 847 | else closeList(true); |
| 848 | break; |
| 849 | } |
| 850 | }); |
| 851 | |
| 852 | // A synthesised key can arrive as a keydown and a separate character |
| 853 | // event, and the second carries the \r implicit form submission listens |
| 854 | // for with no memory of the first one's preventDefault. Measured, not |
| 855 | // guessed (issue #86): without this a browser drive submitted the form |
| 856 | // on every Enter and passed only by outrunning the navigation. Keyed on |
| 857 | // what the keydown did rather than on `open`, because taking a row has |
| 858 | // closed the list by the time the character arrives. |
| 859 | input.addEventListener("keypress", (e) => { |
| 860 | if (e.key === "Enter" && tookEnter) e.preventDefault(); |
| 861 | tookEnter = false; |
| 862 | }); |
| 863 | |
| 864 | // mousedown, not click, so focus never leaves the input mid-pick. |
| 865 | list.addEventListener("mousedown", (e) => { |
| 866 | const li = e.target.closest("[rst-combo-option]"); |
| 867 | if (!li) return; |
| 868 | e.preventDefault(); |
| 869 | choose(opts.find((o) => o.li === li)); |
| 870 | }); |
| 871 | |
| 872 | // Leaving the box after typing takes the settled row, as Tab does: on a |
| 873 | // phone there is no Tab. With nothing typed, leaving only leaves. |
| 874 | wrap.addEventListener("focusout", (e) => { |
| 875 | if (gone) return; |
| 876 | if (wrap.contains(e.relatedTarget)) return; |
| 877 | flush(); |
| 878 | if (settledPick()) choose(settledPick()); |
| 879 | else closeList(true); |
| 880 | }); |
| 881 | |
| 882 | // Rows the page adds after the select's own, replacing whatever it added |
| 883 | // last: suggestions for what to do with the typed text. Each is |
| 884 | // {label, meta, run}; an empty list takes them all away. |
| 885 | // The rows last handed over, so a rebuild can hand them to the new box. |
| 886 | let given = []; |
| 887 | wrap.rstExtras = (rows) => { |
| 888 | given = rows || []; |
| 889 | for (let i = opts.length - 1; i >= 0; i--) { |
| 890 | if (!opts[i].run) break; |
| 891 | opts[i].li.remove(); |
| 892 | opts.splice(i, 1); |
| 893 | } |
| 894 | for (const row of rows || []) { |
| 895 | const li = el("li", "rst-combo-option"); |
| 896 | li.id = listId + "-extra-" + ++extras; |
| 897 | li.setAttribute("role", "option"); |
| 898 | li.setAttribute("aria-selected", "false"); |
| 899 | const name = el("span", "rst-combo-name"); |
| 900 | name.textContent = row.label; |
| 901 | li.append(name); |
| 902 | if (row.meta) { |
| 903 | const meta = el("span", "rst-combo-desc"); |
| 904 | meta.textContent = row.meta; |
| 905 | li.append(meta); |
| 906 | } |
| 907 | list.appendChild(li); |
| 908 | // index -1, so markSelected can never call one selected. |
| 909 | opts.push({ text: row.label, name: row.label, desc: row.meta || "", short: "", lead: "", |
| 910 | terms: [], first: false, disabled: false, index: -1, group: null, el: null, li, run: row.run }); |
| 911 | } |
| 912 | shown = opts; |
| 913 | if (open) filter(query()); |
| 914 | }; |
| 915 | |
| 916 | // A write from outside (reset, autofill, a sibling script) dispatches |
| 917 | // "change", and the display follows. choose()'s own lands as a no-op. |
| 918 | // Listeners this box puts on the select, which outlives it: removed in |
| 919 | // one go when the box steps aside, or every rebuild would leave one |
| 920 | // more set answering the select's events for a box no longer there. |
| 921 | const mine = new AbortController(); |
| 922 | native.addEventListener("change", () => { |
| 923 | showText(); |
| 924 | showPick(); |
| 925 | markSelected(); |
| 926 | input.setCustomValidity(""); |
| 927 | settleValidity(); |
| 928 | }, { signal: mine.signal }); |
| 929 | |
| 930 | // A REQUIRED select still validates — it is still what the form posts — |
| 931 | // but it is out of sight and aria-hidden, so the browser's "please pick |
| 932 | // one" would focus a control nobody can see. The focus it gives the |
| 933 | // select is handed to the box, which BORROWS the select's message for |
| 934 | // the moment it is shown and gives it straight back: left on the box, it |
| 935 | // would keep the form refusing after the select stopped being required. |
| 936 | const settleValidity = () => { |
| 937 | if (!native.validity.valid && native.willValidate) return; |
| 938 | // Valid now, or no longer validated at all (a sibling script |
| 939 | // dropped required, or disabled it): the borrowed message goes too, |
| 940 | // or it would keep the form refusing a select that no longer objects. |
| 941 | input.removeAttribute("aria-invalid"); |
| 942 | input.setCustomValidity(""); |
| 943 | }; |
| 944 | native.addEventListener("invalid", () => input.setAttribute("aria-invalid", "true"), { signal: mine.signal }); |
| 945 | // "true", not an empty value: an ARIA boolean is a string. |
| 946 | const settleRequired = () => { |
| 947 | if (native.required) input.setAttribute("aria-required", "true"); |
| 948 | else input.removeAttribute("aria-required"); |
| 949 | }; |
| 950 | settleRequired(); |
| 951 | // A sibling script may stop the select being required (or start it) |
| 952 | // without touching it otherwise. That changes which blanks are prompts, |
| 953 | // and so what the box shows and which row is selected. |
| 954 | const flips = new MutationObserver(() => { |
| 955 | settleRequired(); |
| 956 | settleValidity(); |
| 957 | for (const o of opts) { |
| 958 | if (!o.run) o.prompt = isPrompt(o.el.value, o.marked, native.required, o.el.disabled); |
| 959 | } |
| 960 | markSelected(); |
| 961 | // An open list re-reads its rows: a blank that just became a prompt |
| 962 | // must leave it, and must not stay the highlight. |
| 963 | if (open) { |
| 964 | if (showingPick) showText(); |
| 965 | filter(query()); |
| 966 | } else { |
| 967 | showText(); |
| 968 | showPick(); |
| 969 | } |
| 970 | }); |
| 971 | flips.observe(native, { attributes: true, attributeFilter: ["required", "disabled"] }); |
| 972 | |
| 973 | // Stepping aside: the box gives the page its select back as it found |
| 974 | // it. Used when the page changes the options (the box is rebuilt from |
| 975 | // what is there now) and when it replaces the select outright (the box |
| 976 | // goes, and whatever took the select's place is enhanced afresh). Every |
| 977 | // observer is disconnected first, so nothing of the old box reacts to |
| 978 | // the new one's work; and `gone` quiets its focus handlers, which a |
| 979 | // browser may fire as the box leaves the page. |
| 980 | let gone = false; |
| 981 | const stepAside = () => { |
| 982 | gone = true; |
| 983 | mine.abort(); |
| 984 | flips.disconnect(); |
| 985 | options.disconnect(); |
| 986 | swapped.disconnect(); |
| 987 | closeList(false); |
| 988 | cancelAnimationFrame(frame); |
| 989 | cancelAnimationFrame(layout); |
| 990 | native.classList.remove("rst-sr-only"); |
| 991 | native.removeAttribute("tabindex"); |
| 992 | native.removeAttribute("aria-hidden"); |
| 993 | if (inputAttr !== null) native.setAttribute("rst-input", inputAttr); |
| 994 | delete native.dataset.rstEnhanced; |
| 995 | enhanced.delete(native); |
| 996 | if (label) label.htmlFor = native.id; |
| 997 | wrap.remove(); |
| 998 | }; |
| 999 | // The page changed the options themselves (rebuilt a list, retitled a |
| 1000 | // row): every row must be an option the select really has, so the box |
| 1001 | // is built again from what is there now. Somebody mid-search keeps |
| 1002 | // their focus and their words. |
| 1003 | const options = new MutationObserver((records) => { |
| 1004 | if (!records.some((r) => r.target !== native || r.type !== "attributes")) return; |
| 1005 | // Changed and then moved or replaced in the same task: that is a |
| 1006 | // handover, not a rebuild (this observer runs first). |
| 1007 | if (!native.isConnected || native.parentNode !== wrap.parentNode) { |
| 1008 | stepAside(); |
| 1009 | queueMicrotask(() => scan()); |
| 1010 | return; |
| 1011 | } |
| 1012 | // Typing not yet searched is searched first, or the words and the |
| 1013 | // highlight below would describe two different searches. |
| 1014 | flush(); |
| 1015 | const resume = { |
| 1016 | focused: document.activeElement === input, open, typed: showingPick ? null : input.value, |
| 1017 | // The row somebody is on — by its option, or by its place among the |
| 1018 | // page's extras — and whether they arrowed there: Enter and Tab must |
| 1019 | // still mean that row after the rebuild. |
| 1020 | at: active && active.el, extra: active && active.run ? opts.filter((o) => o.run).indexOf(active) : -1, |
| 1021 | steered, given, tookEnter, |
| 1022 | caret: [input.selectionStart, input.selectionEnd, input.selectionDirection], |
| 1023 | }; |
| 1024 | stepAside(); |
| 1025 | combo(native, resume); |
| 1026 | }); |
| 1027 | options.observe(native, { childList: true, subtree: true, characterData: true, attributes: true, |
| 1028 | attributeFilter: ["value", "label", "disabled", "data-rst-prompt"] }); |
| 1029 | // The page replaced the select itself (a question flow swapping its |
| 1030 | // answer control): this box would speak for an element no longer in |
| 1031 | // the form, showing one pick while the form posts another. It steps |
| 1032 | // aside, and the element that took the select's place is enhanced if |
| 1033 | // it asks to be. |
| 1034 | const swapped = new MutationObserver(() => { |
| 1035 | if (native.isConnected && native.parentNode === wrap.parentNode) return; |
| 1036 | stepAside(); |
| 1037 | // After every observer has run: two selects replaced in one task |
| 1038 | // each retire their box first, so no new box is built while an old |
| 1039 | // one still holds its label. |
| 1040 | queueMicrotask(() => scan()); |
| 1041 | }); |
| 1042 | if (wrap.parentNode) swapped.observe(wrap.parentNode, { childList: true }); |
| 1043 | native.addEventListener("focus", () => { |
| 1044 | input.focus(); |
| 1045 | if (!native.validity.valid) { |
| 1046 | input.setCustomValidity(native.validationMessage); |
| 1047 | input.reportValidity(); |
| 1048 | } |
| 1049 | }, { signal: mine.signal }); |
| 1050 | input.addEventListener("input", () => input.setCustomValidity("")); |
| 1051 | input.addEventListener("blur", () => { |
| 1052 | if (gone) return; |
| 1053 | input.setCustomValidity(""); |
| 1054 | settleValidity(); |
| 1055 | }); |
| 1056 | if (resume) { |
| 1057 | resuming = true; |
| 1058 | if (resume.focused) input.focus(); |
| 1059 | resuming = false; |
| 1060 | tookEnter = resume.tookEnter; |
| 1061 | if (resume.given.length) wrap.rstExtras(resume.given); |
| 1062 | if (resume.open) { |
| 1063 | openList(resume.typed === null); |
| 1064 | if (resume.typed !== null) { |
| 1065 | input.value = resume.typed; |
| 1066 | showingPick = false; |
| 1067 | lead.hidden = true; |
| 1068 | wrap.removeAttribute("rst-combo-has-lead"); |
| 1069 | filter(resume.typed); |
| 1070 | } |
| 1071 | const was = resume.extra >= 0 ? opts.filter((o) => o.run)[resume.extra] |
| 1072 | : resume.at && opts.find((o) => o.el === resume.at && isShown(o.li) && !o.disabled); |
| 1073 | if (was) { |
| 1074 | setActive(was); |
| 1075 | steered = resume.steered; |
| 1076 | } |
| 1077 | } |
| 1078 | if (resume.focused) input.setSelectionRange(...resume.caret); |
| 1079 | } |
| 1080 | return input; |
| 1081 | } |
| 1082 | |
| 1083 | // Idempotent, so re-scanning is safe. A select arriving later inside a |
| 1084 | // polled fragment stays native — correct, not enhanced. |
| 1085 | // Enhances every data-rst-select under root not already enhanced (the |
| 1086 | // WeakSet in combo), so calling it again is harmless. |
| 1087 | function scan(root) { |
| 1088 | const within = root && root.querySelectorAll ? root : document; |
| 1089 | const found = [...within.querySelectorAll("select[data-rst-select]")]; |
| 1090 | if (within.matches && within.matches("select[data-rst-select]")) found.push(within); |
| 1091 | found.forEach((s) => { |
| 1092 | // data-rst-select="false" is the markup-side opt-out; to CSS the |
| 1093 | // attribute is simply present, so it is checked here. |
| 1094 | if (s.dataset.rstSelect !== "false" && !s.multiple) combo(s); |
| 1095 | }); |
| 1096 | } |
| 1097 | |
| 1098 | if (document.readyState === "loading") { |
| 1099 | document.addEventListener("DOMContentLoaded", () => scan()); |
| 1100 | } else { |
| 1101 | scan(); |
| 1102 | } |
| 1103 | // Added content (a modal fetched in, a polled fragment) stays native |
| 1104 | // until the page asks; running this file again instead would |
| 1105 | // double-enhance everything already there. |
| 1106 | // A microtask later, so a box the page replaced in the same task has |
| 1107 | // retired first and handed back its label. |
| 1108 | document.addEventListener("rst:select-scan", (e) => queueMicrotask(() => scan(e.detail && e.detail.root))); |
| 1109 | })(); |
| 1110 | |
amadan