Claude
003e6ebe15
Introduce a general 'prefetch' option (rows to load on first open, default 0 = unchanged) carried as data-prefetch. Rework the JS search so a search_url widget filters its loaded window instantly on every keystroke while issuing a debounced server request for the rest, with an AbortController so a slower earlier response can never overwrite a newer one. No-results stays hidden until the server response decides it, avoiding a flash over an incomplete window. On first focus a prefetch-enabled widget seeds its window immediately. Rename single-letter locals to full words while reworking these functions. https://claude.ai/code/session_01XzhXvMvw42CQGc9kmin3GS
359 lines
13 KiB
JavaScript
359 lines
13 KiB
JavaScript
/**
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* SearchSelect widget — a search box paired with a dropdown of options.
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* Multi-select renders chosen items as removable pills (inline with the search
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* box), each backed by a hidden <input>. Single-select renders no pill: the
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* committed label lives inside the search box (which doubles as a combobox —
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* focus clears it to search, picking an option fills it), with a lone hidden
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* <input> carrying the value. Both keep hidden inputs so Django validation works.
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*
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* Mirrors selectable_filter.js: initAll() on DOMContentLoaded + htmx:afterSwap,
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* each widget guarded with el._ssInit.
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*
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* The pill / option class strings below are kept byte-identical to the Python
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* Pill / SearchSelect components so Tailwind generates the classes and
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* server-rendered and JS-created pills are indistinguishable.
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*/
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(function () {
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"use strict";
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var PILL_CLASS =
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"inline-flex items-center gap-1 px-2 py-0.5 text-sm rounded " +
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"bg-brand/15 text-heading";
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var PILL_REMOVE_CLASS =
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"ml-1 text-body hover:text-heading font-bold cursor-pointer";
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var OPTION_ROW_CLASS =
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"px-3 py-2 text-sm text-heading cursor-pointer hover:bg-brand/15";
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var DEBOUNCE_MS = 500;
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function initAll() {
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document.querySelectorAll("[data-search-select]").forEach(function (el) {
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if (el._ssInit) return;
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el._ssInit = true;
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initWidget(el);
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});
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}
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function initWidget(container) {
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var search = container.querySelector("[data-ss-search]");
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var options = container.querySelector("[data-ss-options]");
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var pills = container.querySelector("[data-ss-pills]");
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if (!search || !options || !pills) return;
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var name = container.getAttribute("data-name");
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var searchUrl = container.getAttribute("data-search-url");
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var multi = container.getAttribute("data-multi") === "true";
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var alwaysVisible = container.getAttribute("data-always-visible") === "true";
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var itemsScroll = parseInt(container.getAttribute("data-items-scroll"), 10) || 10;
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var prefetch = parseInt(container.getAttribute("data-prefetch"), 10) || 0;
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var syncUrl = container.getAttribute("data-sync-url") === "true";
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var noResults = options.querySelector("[data-ss-no-results]");
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var debounceTimer = null;
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var pendingRequest = null; // in-flight AbortController, so newer queries win
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var hasPrefetched = false;
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function showPanel() {
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options.classList.remove("hidden");
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}
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function hidePanel() {
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if (!alwaysVisible) options.classList.add("hidden");
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}
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function setNoResults(visible) {
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if (noResults) noResults.classList.toggle("hidden", !visible);
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}
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// ── Render server-fetched rows into the panel ──
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function renderRows(items) {
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options.querySelectorAll("[data-ss-option]").forEach(function (row) {
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row.remove();
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});
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items.slice(0, itemsScroll).forEach(function (item) {
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options.insertBefore(buildRow(item), noResults || null);
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});
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showPanel();
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}
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function buildRow(option) {
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var row = document.createElement("div");
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row.setAttribute("data-ss-option", "");
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row.setAttribute("data-value", option.value);
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row.setAttribute("data-label", option.label);
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row.className = OPTION_ROW_CLASS;
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var data = option.data || {};
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Object.keys(data).forEach(function (key) {
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row.setAttribute("data-" + key, data[key]);
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});
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row.textContent = option.label;
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row._ssOption = option;
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return row;
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}
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// ── Client-side filter of the currently loaded rows. Returns the number of
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// visible rows so the caller decides whether to show the no-results node. ──
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function filterRows(query) {
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var lower = query.toLowerCase();
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var visibleCount = 0;
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options.querySelectorAll("[data-ss-option]").forEach(function (item) {
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var label = (item.getAttribute("data-label") || "").toLowerCase();
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var match = label.indexOf(lower) !== -1;
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item.style.display = match ? "" : "none";
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if (match) visibleCount += 1;
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});
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return visibleCount;
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}
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// ── Fetch matching rows from the server. The previous in-flight request is
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// aborted so a slower earlier response can never overwrite a newer one. ──
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function fetchFromServer(query) {
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if (pendingRequest) pendingRequest.abort();
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pendingRequest = new AbortController();
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var url = searchUrl + "?q=" + encodeURIComponent(query);
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if (prefetch && !query) url += "&limit=" + prefetch;
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fetch(url, { credentials: "same-origin", signal: pendingRequest.signal })
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.then(function (response) {
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return response.json();
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})
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.then(function (items) {
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pendingRequest = null;
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renderRows(items);
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// Re-apply the live query: the box may hold more text than was sent.
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setNoResults(filterRows(search.value.trim()) === 0);
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})
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.catch(function (error) {
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if (error && error.name === "AbortError") return; // superseded
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pendingRequest = null;
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setNoResults(true);
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});
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}
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// Called on every keystroke. With a search_url, filter the loaded window
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// instantly (zero latency) and debounce a server request for the rest;
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// no-results stays hidden until the response decides it, to avoid a flash
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// over an incomplete window. Without a search_url the loaded set is complete,
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// so the client-side filter is authoritative.
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function runSearch() {
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var query = search.value.trim();
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showPanel();
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if (searchUrl) {
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filterRows(query);
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setNoResults(false);
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clearTimeout(debounceTimer);
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debounceTimer = setTimeout(function () {
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fetchFromServer(query);
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}, DEBOUNCE_MS);
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} else {
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setNoResults(filterRows(query) === 0);
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}
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}
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// ── Single-select combobox: the search box shows the committed label;
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// focusing clears it to search, blurring restores it (or deselects). ──
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if (!multi) container._ssLabel = search.value;
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search.addEventListener("focus", function () {
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if (!multi) {
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// Hide the committed label so the box becomes a fresh search field.
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search.value = "";
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container._ssDirty = false;
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}
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showPanel();
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if (searchUrl) {
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if (prefetch && !hasPrefetched) {
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// Seed the window immediately on first open (not debounced).
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hasPrefetched = true;
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fetchFromServer("");
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} else {
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// Show whatever is already loaded; the server decides no-results.
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filterRows(search.value.trim());
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setNoResults(false);
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}
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} else {
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setNoResults(filterRows(search.value.trim()) === 0);
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}
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});
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search.addEventListener("input", function () {
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if (!multi) container._ssDirty = true;
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runSearch();
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});
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if (!multi) {
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search.addEventListener("blur", function () {
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// Defer so an option click (which fires before blur settles) wins.
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setTimeout(function () {
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if (container._ssDirty && search.value.trim() === "") {
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// User intentionally cleared the box → deselect.
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pills.innerHTML = "";
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container._ssLabel = "";
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emitChange(null);
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} else {
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// Focused-and-left, or typed a partial query without picking →
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// restore the committed label (no-op right after a selection).
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search.value = container._ssLabel || "";
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}
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}, 120);
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});
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}
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// Clicking an option must not blur the input before the click selects.
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options.addEventListener("mousedown", function (e) {
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e.preventDefault();
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});
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// ── Option click → select ──
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options.addEventListener("click", function (e) {
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var row = e.target.closest("[data-ss-option]");
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if (!row) return;
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var option = optionFromRow(row);
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selectOption(option);
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});
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function optionFromRow(row) {
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if (row._ssOption) return row._ssOption;
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var data = {};
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Object.keys(row.dataset).forEach(function (key) {
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if (key !== "value" && key !== "label" && key !== "ssOption") {
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data[key] = row.dataset[key];
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}
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});
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return {
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value: row.getAttribute("data-value"),
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label: row.getAttribute("data-label"),
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data: data,
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};
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}
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function selectOption(option) {
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if (multi) {
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if (!pills.querySelector('input[value="' + cssEscape(option.value) + '"]')) {
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addPill(option);
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}
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} else {
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// Single-select: no pill — show the label in the search box and keep a
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// lone hidden input under [data-ss-pills] for submission.
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pills.innerHTML = "";
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pills.appendChild(buildHidden(option.value));
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search.value = option.label;
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container._ssLabel = option.label;
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container._ssDirty = false;
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hidePanel();
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}
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emitChange(option);
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}
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function addPill(option) {
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pills.appendChild(buildPill(option));
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pills.appendChild(buildHidden(option.value));
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}
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function buildPill(option) {
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var pill = document.createElement("span");
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pill.className = PILL_CLASS;
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pill.setAttribute("data-pill", "");
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pill.setAttribute("data-value", option.value);
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var data = option.data || {};
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Object.keys(data).forEach(function (key) {
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pill.setAttribute("data-" + key, data[key]);
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});
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pill.appendChild(document.createTextNode(option.label));
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var remove = document.createElement("button");
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remove.type = "button";
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remove.setAttribute("data-pill-remove", "");
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remove.className = PILL_REMOVE_CLASS;
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remove.setAttribute("aria-label", "Remove");
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remove.textContent = "×";
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pill.appendChild(remove);
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return pill;
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}
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function buildHidden(value) {
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var input = document.createElement("input");
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input.type = "hidden";
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input.name = name;
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input.value = value;
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return input;
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}
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// ── Pill × → remove ──
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pills.addEventListener("click", function (e) {
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var removeBtn = e.target.closest("[data-pill-remove]");
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if (!removeBtn) return;
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var pill = removeBtn.closest("[data-pill]");
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if (!pill) return;
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var value = pill.getAttribute("data-value");
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pill.remove();
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var hidden = pills.querySelector('input[value="' + cssEscape(value) + '"]');
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if (hidden) hidden.remove();
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emitChange(null);
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});
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function currentValues() {
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return Array.prototype.map.call(
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pills.querySelectorAll('input[type="hidden"]'),
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function (input) {
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return input.value;
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}
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);
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}
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function emitChange(last) {
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var values = currentValues();
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if (syncUrl) syncToUrl(values);
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container.dispatchEvent(
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new CustomEvent("search-select:change", {
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bubbles: true,
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detail: { name: name, values: values, last: last },
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})
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);
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}
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function syncToUrl(values) {
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var params = new URLSearchParams(window.location.search);
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params.delete(name);
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values.forEach(function (v) {
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params.append(name, v);
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});
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var qs = params.toString();
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history.replaceState(null, "", qs ? "?" + qs : window.location.pathname);
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}
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// On init, restore from URL params if the server supplied no selected pills.
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if (syncUrl && !pills.querySelector("[data-pill]")) {
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var initial = new URLSearchParams(window.location.search).getAll(name);
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initial.forEach(function (v) {
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addPill({ value: v, label: v, data: {} });
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});
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}
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// ── Close panel on outside click ──
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document.addEventListener("click", function (e) {
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if (!container.contains(e.target)) hidePanel();
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});
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}
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/** Minimal escape for use inside an attribute-value selector. */
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function cssEscape(value) {
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return String(value).replace(/["\\]/g, "\\$&");
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}
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// Forward-looking hook (parallels readSelectableFilters): write each widget's
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// current values to a data-values JSON attribute.
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window.readSearchSelect = function (form) {
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form.querySelectorAll("[data-search-select]").forEach(function (container) {
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var pills = container.querySelector("[data-ss-pills]");
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var values = pills
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? Array.prototype.map.call(
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pills.querySelectorAll('input[type="hidden"]'),
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function (input) {
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return input.value;
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}
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)
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: [];
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container.setAttribute("data-values", JSON.stringify(values));
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});
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};
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document.addEventListener("DOMContentLoaded", initAll);
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document.addEventListener("htmx:afterSwap", initAll);
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})();
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