mirror of
https://github.com/philomena-dev/philomena.git
synced 2024-11-27 13:47:58 +01:00
Extracting chunks of code & slightly refactoring autocomplete script
This commit is contained in:
KoloMl
parent
42138a219b
commit
0fe6cd7842
2 changed files with 233 additions and 165 deletions
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@ -6,39 +6,23 @@ import { LocalAutocompleter } from './utils/local-autocompleter';
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import { handleError } from './utils/requests';
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import { getTermContexts } from './match_query';
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import store from './utils/store';
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import { TermContext } from './query/lex.ts';
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import { $, $$, makeEl, removeEl } from './utils/dom.ts';
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import { mouseMoveThenOver } from './utils/events.ts';
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import { TermContext } from './query/lex';
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import { $$ } from './utils/dom';
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import { fetchSuggestions, SuggestionsPopup, TermSuggestion } from './utils/suggestions';
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type TermSuggestion = {
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label: string;
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value: string;
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};
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const cachedSuggestions: Record<string, TermSuggestion[]> = {};
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let inputField: HTMLInputElement | null = null,
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originalTerm: string | undefined,
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originalQuery: string | undefined,
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selectedTerm: TermContext | null = null;
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function removeParent() {
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const parent = $<HTMLElement>('.autocomplete');
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if (parent) removeEl(parent);
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}
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function removeSelected() {
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const selected = $<HTMLElement>('.autocomplete__item--selected');
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if (selected) selected.classList.remove('autocomplete__item--selected');
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}
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const popup = new SuggestionsPopup();
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function isSearchField(targetInput: HTMLElement): boolean {
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return targetInput && targetInput.dataset.acMode === 'search';
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}
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function restoreOriginalValue() {
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if (!inputField) {
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return;
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}
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if (!inputField) return;
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if (isSearchField(inputField) && originalQuery) {
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inputField.value = originalQuery;
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@ -50,9 +34,7 @@ function restoreOriginalValue() {
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}
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function applySelectedValue(selection: string) {
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if (!inputField) {
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return;
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}
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if (!inputField) return;
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if (!isSearchField(inputField)) {
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inputField.value = selection;
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@ -67,21 +49,6 @@ function applySelectedValue(selection: string) {
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}
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}
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function changeSelected(firstOrLast: Element | null, current: Element | null, sibling: Element | null) {
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if (current && sibling) {
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// if the currently selected item has a sibling, move selection to it
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current.classList.remove('autocomplete__item--selected');
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sibling.classList.add('autocomplete__item--selected');
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} else if (current) {
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// if the next keypress will take the user outside the list, restore the unautocompleted term
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restoreOriginalValue();
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removeSelected();
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} else if (firstOrLast) {
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// if no item in the list is selected, select the first or last
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firstOrLast.classList.add('autocomplete__item--selected');
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}
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}
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function isSelectionOutsideCurrentTerm(): boolean {
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if (!inputField || !selectedTerm) return true;
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if (inputField.selectionStart === null || inputField.selectionEnd === null) return true;
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@ -93,127 +60,43 @@ function isSelectionOutsideCurrentTerm(): boolean {
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}
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function keydownHandler(event: KeyboardEvent) {
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const selected = $<HTMLElement>('.autocomplete__item--selected'),
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firstItem = $<HTMLElement>('.autocomplete__item:first-of-type'),
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lastItem = $<HTMLElement>('.autocomplete__item:last-of-type');
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if (inputField !== event.currentTarget) return;
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if (inputField && isSearchField(inputField)) {
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// Prevent submission of the search field when Enter was hit
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if (selected && event.keyCode === 13) event.preventDefault(); // Enter
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if (popup.selectedTerm && event.keyCode === 13) event.preventDefault(); // Enter
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// Close autocompletion popup when text cursor is outside current tag
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if (selectedTerm && firstItem && (event.keyCode === 37 || event.keyCode === 39)) {
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if (selectedTerm && (event.keyCode === 37 || event.keyCode === 39)) {
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// ArrowLeft || ArrowRight
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requestAnimationFrame(() => {
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if (isSelectionOutsideCurrentTerm()) removeParent();
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if (isSelectionOutsideCurrentTerm()) popup.hide();
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});
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}
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}
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if (event.keyCode === 38) changeSelected(lastItem, selected, selected && selected.previousElementSibling); // ArrowUp
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if (event.keyCode === 40) changeSelected(firstItem, selected, selected && selected.nextElementSibling); // ArrowDown
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if (event.keyCode === 13 || event.keyCode === 27 || event.keyCode === 188) removeParent(); // Enter || Esc || Comma
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if (!popup.isActive) return;
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if (event.keyCode === 38) popup.selectPrevious(); // ArrowUp
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if (event.keyCode === 40) popup.selectNext(); // ArrowDown
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if (event.keyCode === 13 || event.keyCode === 27 || event.keyCode === 188) popup.hide(); // Enter || Esc || Comma
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if (event.keyCode === 38 || event.keyCode === 40) {
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// ArrowUp || ArrowDown
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const newSelected = $<HTMLElement>('.autocomplete__item--selected');
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if (newSelected?.dataset.value) applySelectedValue(newSelected.dataset.value);
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if (popup.selectedTerm) {
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applySelectedValue(popup.selectedTerm);
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} else {
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restoreOriginalValue();
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}
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event.preventDefault();
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}
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}
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function createItem(list: HTMLUListElement, suggestion: TermSuggestion) {
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const item = makeEl('li', {
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className: 'autocomplete__item',
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});
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function findSelectedTerm(targetInput: HTMLInputElement, searchQuery: string): TermContext | null {
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if (targetInput.selectionStart === null || targetInput.selectionEnd === null) return null;
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item.textContent = suggestion.label;
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item.dataset.value = suggestion.value;
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mouseMoveThenOver(item, () => {
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removeSelected();
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item.classList.add('autocomplete__item--selected');
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});
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item.addEventListener('mouseout', () => {
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removeSelected();
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});
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item.addEventListener('click', () => {
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if (!inputField || !item.dataset.value) return;
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applySelectedValue(item.dataset.value);
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inputField.dispatchEvent(
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new CustomEvent('autocomplete', {
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detail: {
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type: 'click',
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label: suggestion.label,
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value: suggestion.value,
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},
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}),
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);
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});
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list.appendChild(item);
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}
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function createList(parentElement: HTMLElement, suggestions: TermSuggestion[]) {
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const list = makeEl('ul', {
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className: 'autocomplete__list',
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});
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suggestions.forEach(suggestion => createItem(list, suggestion));
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parentElement.appendChild(list);
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}
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function createParent(): HTMLElement {
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const parent = makeEl('div');
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parent.className = 'autocomplete';
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if (inputField && inputField.parentElement) {
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// Position the parent below the inputfield
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parent.style.position = 'absolute';
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parent.style.left = `${inputField.offsetLeft}px`;
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// Take the inputfield offset, add its height and subtract the amount by which the parent element has scrolled
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parent.style.top = `${inputField.offsetTop + inputField.offsetHeight - inputField.parentElement.scrollTop}px`;
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}
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// We append the parent at the end of body
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document.body.appendChild(parent);
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return parent;
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}
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function showAutocomplete(suggestions: TermSuggestion[], fetchedTerm: string, targetInput: HTMLInputElement) {
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// Remove old autocomplete suggestions
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removeParent();
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// Save suggestions in cache
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cachedSuggestions[fetchedTerm] = suggestions;
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// If the input target is not empty, still visible, and suggestions were found
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if (targetInput.value && targetInput.style.display !== 'none' && suggestions.length) {
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createList(createParent(), suggestions);
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targetInput.addEventListener('keydown', keydownHandler);
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}
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}
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async function getSuggestions(term: string): Promise<TermSuggestion[]> {
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// In case source URL was not given at all, do not try sending the request.
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if (!inputField?.dataset.acSource) return [];
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return await fetch(`${inputField.dataset.acSource}${term}`)
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.then(handleError)
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.then(response => response.json());
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}
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function getSelectedTerm(): TermContext | null {
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if (!inputField || !originalQuery) return null;
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if (inputField.selectionStart === null || inputField.selectionEnd === null) return null;
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const selectionIndex = Math.min(inputField.selectionStart, inputField.selectionEnd);
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const terms = getTermContexts(originalQuery);
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const selectionIndex = Math.min(targetInput.selectionStart, targetInput.selectionEnd);
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const terms = getTermContexts(searchQuery);
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return terms.find(([range]) => range[0] < selectionIndex && range[1] >= selectionIndex) ?? null;
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}
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@ -232,7 +115,7 @@ function toggleSearchAutocomplete() {
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}
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function listenAutocomplete() {
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let timeout: number | undefined;
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let serverSideSuggestionsTimeout: number | undefined;
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let localAc: LocalAutocompleter | null = null;
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let localFetched = false;
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@ -240,21 +123,25 @@ function listenAutocomplete() {
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document.addEventListener('focusin', fetchLocalAutocomplete);
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document.addEventListener('input', event => {
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removeParent();
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popup.hide();
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fetchLocalAutocomplete(event);
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window.clearTimeout(timeout);
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window.clearTimeout(serverSideSuggestionsTimeout);
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if (!(event.target instanceof HTMLInputElement)) return;
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const targetedInput = event.target;
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if (localAc !== null && 'ac' in targetedInput.dataset) {
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if (!targetedInput.dataset.ac) return;
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targetedInput.addEventListener('keydown', keydownHandler);
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if (localAc !== null) {
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inputField = targetedInput;
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let suggestionsCount = 5;
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if (isSearchField(inputField)) {
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originalQuery = inputField.value;
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selectedTerm = getSelectedTerm();
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selectedTerm = findSelectedTerm(inputField, originalQuery);
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suggestionsCount = 10;
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// We don't need to run auto-completion if user is not selecting tag at all
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@ -273,40 +160,38 @@ function listenAutocomplete() {
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.map(({ name, imageCount }) => ({ label: `${name} (${imageCount})`, value: name }));
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if (suggestions.length) {
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return showAutocomplete(suggestions, originalTerm, targetedInput);
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popup.renderSuggestions(suggestions).showForField(targetedInput);
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return;
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}
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}
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const { acMinLength: minTermLength, acSource: endpointUrl } = targetedInput.dataset;
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if (!endpointUrl) return;
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// Use a timeout to delay requests until the user has stopped typing
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timeout = window.setTimeout(() => {
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serverSideSuggestionsTimeout = window.setTimeout(() => {
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inputField = targetedInput;
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originalTerm = inputField.value;
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const fetchedTerm = inputField.value;
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const { ac, acMinLength, acSource } = inputField.dataset;
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if (!ac || !acSource || (acMinLength && fetchedTerm.length < parseInt(acMinLength, 10))) {
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return;
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}
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if (minTermLength && fetchedTerm.length < parseInt(minTermLength, 10)) return;
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if (cachedSuggestions[fetchedTerm]) {
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showAutocomplete(cachedSuggestions[fetchedTerm], fetchedTerm, targetedInput);
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} else {
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// inputField could get overwritten while the suggestions are being fetched - use event.target
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getSuggestions(fetchedTerm).then(suggestions => {
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if (fetchedTerm === targetedInput.value) {
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showAutocomplete(suggestions, fetchedTerm, targetedInput);
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}
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});
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}
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fetchSuggestions(endpointUrl, fetchedTerm).then(suggestions => {
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// inputField could get overwritten while the suggestions are being fetched - use previously targeted input
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if (fetchedTerm === targetedInput.value) {
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popup.renderSuggestions(suggestions).showForField(targetedInput);
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}
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});
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}, 300);
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});
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// If there's a click outside the inputField, remove autocomplete
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document.addEventListener('click', event => {
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if (event.target && event.target !== inputField) removeParent();
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if (event.target && event.target !== inputField) popup.hide();
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if (inputField && event.target === inputField && isSearchField(inputField) && isSelectionOutsideCurrentTerm()) {
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removeParent();
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popup.hide();
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}
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});
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@ -329,6 +214,24 @@ function listenAutocomplete() {
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}
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toggleSearchAutocomplete();
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popup.onItemSelected((event: CustomEvent<TermSuggestion>) => {
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if (!event.detail || !inputField) return;
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const originalSuggestion = event.detail;
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applySelectedValue(originalSuggestion.value);
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inputField.dispatchEvent(
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new CustomEvent('autocomplete', {
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detail: Object.assign(
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{
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type: 'click',
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},
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originalSuggestion,
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),
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}),
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);
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});
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}
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export { listenAutocomplete };
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165
assets/js/utils/suggestions.ts
Normal file
165
assets/js/utils/suggestions.ts
Normal file
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@ -0,0 +1,165 @@
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import { makeEl } from './dom.ts';
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import { mouseMoveThenOver } from './events.ts';
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import { handleError } from './requests.ts';
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export interface TermSuggestion {
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label: string;
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value: string;
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}
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const selectedSuggestionClassName = 'autocomplete__item--selected';
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export class SuggestionsPopup {
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private readonly container: HTMLElement;
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private readonly listElement: HTMLUListElement;
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private selectedElement: HTMLElement | null = null;
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constructor() {
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this.container = makeEl('div', {
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className: 'autocomplete',
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});
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this.listElement = makeEl('ul', {
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className: 'autocomplete__list',
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});
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this.container.appendChild(this.listElement);
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}
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get selectedTerm(): string | null {
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return this.selectedElement?.dataset.value || null;
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}
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get isActive(): boolean {
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return this.container.isConnected;
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}
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hide() {
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this.clearSelection();
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this.container.remove();
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}
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private clearSelection() {
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if (!this.selectedElement) return;
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this.selectedElement.classList.remove(selectedSuggestionClassName);
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this.selectedElement = null;
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}
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private updateSelection(targetItem: HTMLElement) {
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this.clearSelection();
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this.selectedElement = targetItem;
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this.selectedElement.classList.add(selectedSuggestionClassName);
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}
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renderSuggestions(suggestions: TermSuggestion[]): SuggestionsPopup {
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this.clearSelection();
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this.listElement.innerHTML = '';
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for (const suggestedTerm of suggestions) {
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const listItem = makeEl('li', {
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className: 'autocomplete__item',
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innerText: suggestedTerm.label,
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});
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listItem.dataset.value = suggestedTerm.value;
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this.watchItem(listItem, suggestedTerm);
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this.listElement.appendChild(listItem);
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}
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return this;
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}
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private watchItem(listItem: HTMLElement, suggestion: TermSuggestion) {
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mouseMoveThenOver(listItem, () => this.updateSelection(listItem));
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listItem.addEventListener('mouseout', () => this.clearSelection());
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listItem.addEventListener('click', () => {
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if (!listItem.dataset.value) {
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return;
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}
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this.container.dispatchEvent(new CustomEvent('item_selected', { detail: suggestion }));
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});
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}
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private changeSelection(direction: number) {
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if (this.listElement.childElementCount === 0 || direction === 0) {
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return;
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}
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let nextTargetElement: Element | null;
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if (!this.selectedElement) {
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nextTargetElement = direction > 0 ? this.listElement.firstElementChild : this.listElement.lastElementChild;
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} else {
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nextTargetElement =
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direction > 0 ? this.selectedElement.nextElementSibling : this.selectedElement.previousElementSibling;
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}
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if (!(nextTargetElement instanceof HTMLElement) || !nextTargetElement.dataset.value) {
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this.clearSelection();
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return;
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}
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this.updateSelection(nextTargetElement);
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}
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selectNext() {
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return this.changeSelection(1);
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}
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selectPrevious() {
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return this.changeSelection(-1);
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}
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showForField(targetElement: HTMLElement): SuggestionsPopup {
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this.container.style.position = 'absolute';
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this.container.style.left = `${targetElement.offsetLeft}px`;
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let topPosition = targetElement.offsetTop + targetElement.offsetHeight;
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if (targetElement.parentElement) {
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topPosition -= targetElement.parentElement.scrollTop;
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}
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this.container.style.top = `${topPosition}px`;
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document.body.appendChild(this.container);
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return this;
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}
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onItemSelected(callback: (event: CustomEvent<TermSuggestion>) => void) {
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this.container.addEventListener('item_selected', callback as EventListener);
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}
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}
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const cachedSuggestions = new Map<string, Promise<TermSuggestion[]>>();
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export async function fetchSuggestions(endpoint: string, targetTerm: string) {
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const normalizedTerm = targetTerm.trim().toLowerCase();
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if (cachedSuggestions.has(normalizedTerm)) {
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return cachedSuggestions.get(normalizedTerm)!;
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}
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||||
|
||||
const promisedSuggestions: Promise<TermSuggestion[]> = fetch(`${endpoint}${targetTerm}`)
|
||||
.then(handleError)
|
||||
.then(response => response.json())
|
||||
.catch(() => {
|
||||
// Deleting the promised result from cache to allow retrying
|
||||
cachedSuggestions.delete(normalizedTerm);
|
||||
|
||||
// And resolve failed promise with empty array
|
||||
return [];
|
||||
});
|
||||
|
||||
cachedSuggestions.set(normalizedTerm, promisedSuggestions);
|
||||
|
||||
return promisedSuggestions;
|
||||
}
|
||||
Loading…
Reference in a new issue