mirror of
https://github.com/philomena-dev/philomena.git
synced 2024-11-23 20:18:00 +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
|
|
@ -6,39 +6,23 @@ import { LocalAutocompleter } from './utils/local-autocompleter';
|
|||
import { handleError } from './utils/requests';
|
||||
import { getTermContexts } from './match_query';
|
||||
import store from './utils/store';
|
||||
import { TermContext } from './query/lex.ts';
|
||||
import { $, $$, makeEl, removeEl } from './utils/dom.ts';
|
||||
import { mouseMoveThenOver } from './utils/events.ts';
|
||||
import { TermContext } from './query/lex';
|
||||
import { $$ } from './utils/dom';
|
||||
import { fetchSuggestions, SuggestionsPopup, TermSuggestion } from './utils/suggestions';
|
||||
|
||||
type TermSuggestion = {
|
||||
label: string;
|
||||
value: string;
|
||||
};
|
||||
|
||||
const cachedSuggestions: Record<string, TermSuggestion[]> = {};
|
||||
let inputField: HTMLInputElement | null = null,
|
||||
originalTerm: string | undefined,
|
||||
originalQuery: string | undefined,
|
||||
selectedTerm: TermContext | null = null;
|
||||
|
||||
function removeParent() {
|
||||
const parent = $<HTMLElement>('.autocomplete');
|
||||
if (parent) removeEl(parent);
|
||||
}
|
||||
|
||||
function removeSelected() {
|
||||
const selected = $<HTMLElement>('.autocomplete__item--selected');
|
||||
if (selected) selected.classList.remove('autocomplete__item--selected');
|
||||
}
|
||||
const popup = new SuggestionsPopup();
|
||||
|
||||
function isSearchField(targetInput: HTMLElement): boolean {
|
||||
return targetInput && targetInput.dataset.acMode === 'search';
|
||||
}
|
||||
|
||||
function restoreOriginalValue() {
|
||||
if (!inputField) {
|
||||
return;
|
||||
}
|
||||
if (!inputField) return;
|
||||
|
||||
if (isSearchField(inputField) && originalQuery) {
|
||||
inputField.value = originalQuery;
|
||||
|
|
@ -50,9 +34,7 @@ function restoreOriginalValue() {
|
|||
}
|
||||
|
||||
function applySelectedValue(selection: string) {
|
||||
if (!inputField) {
|
||||
return;
|
||||
}
|
||||
if (!inputField) return;
|
||||
|
||||
if (!isSearchField(inputField)) {
|
||||
inputField.value = selection;
|
||||
|
|
@ -67,21 +49,6 @@ function applySelectedValue(selection: string) {
|
|||
}
|
||||
}
|
||||
|
||||
function changeSelected(firstOrLast: Element | null, current: Element | null, sibling: Element | null) {
|
||||
if (current && sibling) {
|
||||
// if the currently selected item has a sibling, move selection to it
|
||||
current.classList.remove('autocomplete__item--selected');
|
||||
sibling.classList.add('autocomplete__item--selected');
|
||||
} else if (current) {
|
||||
// if the next keypress will take the user outside the list, restore the unautocompleted term
|
||||
restoreOriginalValue();
|
||||
removeSelected();
|
||||
} else if (firstOrLast) {
|
||||
// if no item in the list is selected, select the first or last
|
||||
firstOrLast.classList.add('autocomplete__item--selected');
|
||||
}
|
||||
}
|
||||
|
||||
function isSelectionOutsideCurrentTerm(): boolean {
|
||||
if (!inputField || !selectedTerm) return true;
|
||||
if (inputField.selectionStart === null || inputField.selectionEnd === null) return true;
|
||||
|
|
@ -93,127 +60,43 @@ function isSelectionOutsideCurrentTerm(): boolean {
|
|||
}
|
||||
|
||||
function keydownHandler(event: KeyboardEvent) {
|
||||
const selected = $<HTMLElement>('.autocomplete__item--selected'),
|
||||
firstItem = $<HTMLElement>('.autocomplete__item:first-of-type'),
|
||||
lastItem = $<HTMLElement>('.autocomplete__item:last-of-type');
|
||||
if (inputField !== event.currentTarget) return;
|
||||
|
||||
if (inputField && isSearchField(inputField)) {
|
||||
// Prevent submission of the search field when Enter was hit
|
||||
if (selected && event.keyCode === 13) event.preventDefault(); // Enter
|
||||
if (popup.selectedTerm && event.keyCode === 13) event.preventDefault(); // Enter
|
||||
|
||||
// Close autocompletion popup when text cursor is outside current tag
|
||||
if (selectedTerm && firstItem && (event.keyCode === 37 || event.keyCode === 39)) {
|
||||
if (selectedTerm && (event.keyCode === 37 || event.keyCode === 39)) {
|
||||
// ArrowLeft || ArrowRight
|
||||
requestAnimationFrame(() => {
|
||||
if (isSelectionOutsideCurrentTerm()) removeParent();
|
||||
if (isSelectionOutsideCurrentTerm()) popup.hide();
|
||||
});
|
||||
}
|
||||
}
|
||||
|
||||
if (event.keyCode === 38) changeSelected(lastItem, selected, selected && selected.previousElementSibling); // ArrowUp
|
||||
if (event.keyCode === 40) changeSelected(firstItem, selected, selected && selected.nextElementSibling); // ArrowDown
|
||||
if (event.keyCode === 13 || event.keyCode === 27 || event.keyCode === 188) removeParent(); // Enter || Esc || Comma
|
||||
if (!popup.isActive) return;
|
||||
|
||||
if (event.keyCode === 38) popup.selectPrevious(); // ArrowUp
|
||||
if (event.keyCode === 40) popup.selectNext(); // ArrowDown
|
||||
if (event.keyCode === 13 || event.keyCode === 27 || event.keyCode === 188) popup.hide(); // Enter || Esc || Comma
|
||||
if (event.keyCode === 38 || event.keyCode === 40) {
|
||||
// ArrowUp || ArrowDown
|
||||
const newSelected = $<HTMLElement>('.autocomplete__item--selected');
|
||||
if (newSelected?.dataset.value) applySelectedValue(newSelected.dataset.value);
|
||||
if (popup.selectedTerm) {
|
||||
applySelectedValue(popup.selectedTerm);
|
||||
} else {
|
||||
restoreOriginalValue();
|
||||
}
|
||||
|
||||
event.preventDefault();
|
||||
}
|
||||
}
|
||||
|
||||
function createItem(list: HTMLUListElement, suggestion: TermSuggestion) {
|
||||
const item = makeEl('li', {
|
||||
className: 'autocomplete__item',
|
||||
});
|
||||
function findSelectedTerm(targetInput: HTMLInputElement, searchQuery: string): TermContext | null {
|
||||
if (targetInput.selectionStart === null || targetInput.selectionEnd === null) return null;
|
||||
|
||||
item.textContent = suggestion.label;
|
||||
item.dataset.value = suggestion.value;
|
||||
|
||||
mouseMoveThenOver(item, () => {
|
||||
removeSelected();
|
||||
item.classList.add('autocomplete__item--selected');
|
||||
});
|
||||
|
||||
item.addEventListener('mouseout', () => {
|
||||
removeSelected();
|
||||
});
|
||||
|
||||
item.addEventListener('click', () => {
|
||||
if (!inputField || !item.dataset.value) return;
|
||||
|
||||
applySelectedValue(item.dataset.value);
|
||||
|
||||
inputField.dispatchEvent(
|
||||
new CustomEvent('autocomplete', {
|
||||
detail: {
|
||||
type: 'click',
|
||||
label: suggestion.label,
|
||||
value: suggestion.value,
|
||||
},
|
||||
}),
|
||||
);
|
||||
});
|
||||
|
||||
list.appendChild(item);
|
||||
}
|
||||
|
||||
function createList(parentElement: HTMLElement, suggestions: TermSuggestion[]) {
|
||||
const list = makeEl('ul', {
|
||||
className: 'autocomplete__list',
|
||||
});
|
||||
|
||||
suggestions.forEach(suggestion => createItem(list, suggestion));
|
||||
|
||||
parentElement.appendChild(list);
|
||||
}
|
||||
|
||||
function createParent(): HTMLElement {
|
||||
const parent = makeEl('div');
|
||||
parent.className = 'autocomplete';
|
||||
|
||||
if (inputField && inputField.parentElement) {
|
||||
// Position the parent below the inputfield
|
||||
parent.style.position = 'absolute';
|
||||
parent.style.left = `${inputField.offsetLeft}px`;
|
||||
// Take the inputfield offset, add its height and subtract the amount by which the parent element has scrolled
|
||||
parent.style.top = `${inputField.offsetTop + inputField.offsetHeight - inputField.parentElement.scrollTop}px`;
|
||||
}
|
||||
|
||||
// We append the parent at the end of body
|
||||
document.body.appendChild(parent);
|
||||
|
||||
return parent;
|
||||
}
|
||||
|
||||
function showAutocomplete(suggestions: TermSuggestion[], fetchedTerm: string, targetInput: HTMLInputElement) {
|
||||
// Remove old autocomplete suggestions
|
||||
removeParent();
|
||||
|
||||
// Save suggestions in cache
|
||||
cachedSuggestions[fetchedTerm] = suggestions;
|
||||
|
||||
// If the input target is not empty, still visible, and suggestions were found
|
||||
if (targetInput.value && targetInput.style.display !== 'none' && suggestions.length) {
|
||||
createList(createParent(), suggestions);
|
||||
targetInput.addEventListener('keydown', keydownHandler);
|
||||
}
|
||||
}
|
||||
|
||||
async function getSuggestions(term: string): Promise<TermSuggestion[]> {
|
||||
// In case source URL was not given at all, do not try sending the request.
|
||||
if (!inputField?.dataset.acSource) return [];
|
||||
|
||||
return await fetch(`${inputField.dataset.acSource}${term}`)
|
||||
.then(handleError)
|
||||
.then(response => response.json());
|
||||
}
|
||||
|
||||
function getSelectedTerm(): TermContext | null {
|
||||
if (!inputField || !originalQuery) return null;
|
||||
if (inputField.selectionStart === null || inputField.selectionEnd === null) return null;
|
||||
|
||||
const selectionIndex = Math.min(inputField.selectionStart, inputField.selectionEnd);
|
||||
const terms = getTermContexts(originalQuery);
|
||||
const selectionIndex = Math.min(targetInput.selectionStart, targetInput.selectionEnd);
|
||||
const terms = getTermContexts(searchQuery);
|
||||
|
||||
return terms.find(([range]) => range[0] < selectionIndex && range[1] >= selectionIndex) ?? null;
|
||||
}
|
||||
|
|
@ -232,7 +115,7 @@ function toggleSearchAutocomplete() {
|
|||
}
|
||||
|
||||
function listenAutocomplete() {
|
||||
let timeout: number | undefined;
|
||||
let serverSideSuggestionsTimeout: number | undefined;
|
||||
|
||||
let localAc: LocalAutocompleter | null = null;
|
||||
let localFetched = false;
|
||||
|
|
@ -240,21 +123,25 @@ function listenAutocomplete() {
|
|||
document.addEventListener('focusin', fetchLocalAutocomplete);
|
||||
|
||||
document.addEventListener('input', event => {
|
||||
removeParent();
|
||||
popup.hide();
|
||||
fetchLocalAutocomplete(event);
|
||||
window.clearTimeout(timeout);
|
||||
window.clearTimeout(serverSideSuggestionsTimeout);
|
||||
|
||||
if (!(event.target instanceof HTMLInputElement)) return;
|
||||
|
||||
const targetedInput = event.target;
|
||||
|
||||
if (localAc !== null && 'ac' in targetedInput.dataset) {
|
||||
if (!targetedInput.dataset.ac) return;
|
||||
|
||||
targetedInput.addEventListener('keydown', keydownHandler);
|
||||
|
||||
if (localAc !== null) {
|
||||
inputField = targetedInput;
|
||||
let suggestionsCount = 5;
|
||||
|
||||
if (isSearchField(inputField)) {
|
||||
originalQuery = inputField.value;
|
||||
selectedTerm = getSelectedTerm();
|
||||
selectedTerm = findSelectedTerm(inputField, originalQuery);
|
||||
suggestionsCount = 10;
|
||||
|
||||
// We don't need to run auto-completion if user is not selecting tag at all
|
||||
|
|
@ -273,40 +160,38 @@ function listenAutocomplete() {
|
|||
.map(({ name, imageCount }) => ({ label: `${name} (${imageCount})`, value: name }));
|
||||
|
||||
if (suggestions.length) {
|
||||
return showAutocomplete(suggestions, originalTerm, targetedInput);
|
||||
popup.renderSuggestions(suggestions).showForField(targetedInput);
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
||||
const { acMinLength: minTermLength, acSource: endpointUrl } = targetedInput.dataset;
|
||||
|
||||
if (!endpointUrl) return;
|
||||
|
||||
// Use a timeout to delay requests until the user has stopped typing
|
||||
timeout = window.setTimeout(() => {
|
||||
serverSideSuggestionsTimeout = window.setTimeout(() => {
|
||||
inputField = targetedInput;
|
||||
originalTerm = inputField.value;
|
||||
|
||||
const fetchedTerm = inputField.value;
|
||||
const { ac, acMinLength, acSource } = inputField.dataset;
|
||||
|
||||
if (!ac || !acSource || (acMinLength && fetchedTerm.length < parseInt(acMinLength, 10))) {
|
||||
return;
|
||||
}
|
||||
if (minTermLength && fetchedTerm.length < parseInt(minTermLength, 10)) return;
|
||||
|
||||
if (cachedSuggestions[fetchedTerm]) {
|
||||
showAutocomplete(cachedSuggestions[fetchedTerm], fetchedTerm, targetedInput);
|
||||
} else {
|
||||
// inputField could get overwritten while the suggestions are being fetched - use event.target
|
||||
getSuggestions(fetchedTerm).then(suggestions => {
|
||||
if (fetchedTerm === targetedInput.value) {
|
||||
showAutocomplete(suggestions, fetchedTerm, targetedInput);
|
||||
}
|
||||
});
|
||||
}
|
||||
fetchSuggestions(endpointUrl, fetchedTerm).then(suggestions => {
|
||||
// inputField could get overwritten while the suggestions are being fetched - use previously targeted input
|
||||
if (fetchedTerm === targetedInput.value) {
|
||||
popup.renderSuggestions(suggestions).showForField(targetedInput);
|
||||
}
|
||||
});
|
||||
}, 300);
|
||||
});
|
||||
|
||||
// If there's a click outside the inputField, remove autocomplete
|
||||
document.addEventListener('click', event => {
|
||||
if (event.target && event.target !== inputField) removeParent();
|
||||
if (event.target && event.target !== inputField) popup.hide();
|
||||
if (inputField && event.target === inputField && isSearchField(inputField) && isSelectionOutsideCurrentTerm()) {
|
||||
removeParent();
|
||||
popup.hide();
|
||||
}
|
||||
});
|
||||
|
||||
|
|
@ -329,6 +214,24 @@ function listenAutocomplete() {
|
|||
}
|
||||
|
||||
toggleSearchAutocomplete();
|
||||
|
||||
popup.onItemSelected((event: CustomEvent<TermSuggestion>) => {
|
||||
if (!event.detail || !inputField) return;
|
||||
|
||||
const originalSuggestion = event.detail;
|
||||
applySelectedValue(originalSuggestion.value);
|
||||
|
||||
inputField.dispatchEvent(
|
||||
new CustomEvent('autocomplete', {
|
||||
detail: Object.assign(
|
||||
{
|
||||
type: 'click',
|
||||
},
|
||||
originalSuggestion,
|
||||
),
|
||||
}),
|
||||
);
|
||||
});
|
||||
}
|
||||
|
||||
export { listenAutocomplete };
|
||||
|
|
|
|||
165
assets/js/utils/suggestions.ts
Normal file
165
assets/js/utils/suggestions.ts
Normal file
|
|
@ -0,0 +1,165 @@
|
|||
import { makeEl } from './dom.ts';
|
||||
import { mouseMoveThenOver } from './events.ts';
|
||||
import { handleError } from './requests.ts';
|
||||
|
||||
export interface TermSuggestion {
|
||||
label: string;
|
||||
value: string;
|
||||
}
|
||||
|
||||
const selectedSuggestionClassName = 'autocomplete__item--selected';
|
||||
|
||||
export class SuggestionsPopup {
|
||||
private readonly container: HTMLElement;
|
||||
private readonly listElement: HTMLUListElement;
|
||||
private selectedElement: HTMLElement | null = null;
|
||||
|
||||
constructor() {
|
||||
this.container = makeEl('div', {
|
||||
className: 'autocomplete',
|
||||
});
|
||||
|
||||
this.listElement = makeEl('ul', {
|
||||
className: 'autocomplete__list',
|
||||
});
|
||||
|
||||
this.container.appendChild(this.listElement);
|
||||
}
|
||||
|
||||
get selectedTerm(): string | null {
|
||||
return this.selectedElement?.dataset.value || null;
|
||||
}
|
||||
|
||||
get isActive(): boolean {
|
||||
return this.container.isConnected;
|
||||
}
|
||||
|
||||
hide() {
|
||||
this.clearSelection();
|
||||
this.container.remove();
|
||||
}
|
||||
|
||||
private clearSelection() {
|
||||
if (!this.selectedElement) return;
|
||||
|
||||
this.selectedElement.classList.remove(selectedSuggestionClassName);
|
||||
this.selectedElement = null;
|
||||
}
|
||||
|
||||
private updateSelection(targetItem: HTMLElement) {
|
||||
this.clearSelection();
|
||||
|
||||
this.selectedElement = targetItem;
|
||||
this.selectedElement.classList.add(selectedSuggestionClassName);
|
||||
}
|
||||
|
||||
renderSuggestions(suggestions: TermSuggestion[]): SuggestionsPopup {
|
||||
this.clearSelection();
|
||||
|
||||
this.listElement.innerHTML = '';
|
||||
|
||||
for (const suggestedTerm of suggestions) {
|
||||
const listItem = makeEl('li', {
|
||||
className: 'autocomplete__item',
|
||||
innerText: suggestedTerm.label,
|
||||
});
|
||||
|
||||
listItem.dataset.value = suggestedTerm.value;
|
||||
|
||||
this.watchItem(listItem, suggestedTerm);
|
||||
this.listElement.appendChild(listItem);
|
||||
}
|
||||
|
||||
return this;
|
||||
}
|
||||
|
||||
private watchItem(listItem: HTMLElement, suggestion: TermSuggestion) {
|
||||
mouseMoveThenOver(listItem, () => this.updateSelection(listItem));
|
||||
|
||||
listItem.addEventListener('mouseout', () => this.clearSelection());
|
||||
|
||||
listItem.addEventListener('click', () => {
|
||||
if (!listItem.dataset.value) {
|
||||
return;
|
||||
}
|
||||
|
||||
this.container.dispatchEvent(new CustomEvent('item_selected', { detail: suggestion }));
|
||||
});
|
||||
}
|
||||
|
||||
private changeSelection(direction: number) {
|
||||
if (this.listElement.childElementCount === 0 || direction === 0) {
|
||||
return;
|
||||
}
|
||||
|
||||
let nextTargetElement: Element | null;
|
||||
|
||||
if (!this.selectedElement) {
|
||||
nextTargetElement = direction > 0 ? this.listElement.firstElementChild : this.listElement.lastElementChild;
|
||||
} else {
|
||||
nextTargetElement =
|
||||
direction > 0 ? this.selectedElement.nextElementSibling : this.selectedElement.previousElementSibling;
|
||||
}
|
||||
|
||||
if (!(nextTargetElement instanceof HTMLElement) || !nextTargetElement.dataset.value) {
|
||||
this.clearSelection();
|
||||
return;
|
||||
}
|
||||
|
||||
this.updateSelection(nextTargetElement);
|
||||
}
|
||||
|
||||
selectNext() {
|
||||
return this.changeSelection(1);
|
||||
}
|
||||
|
||||
selectPrevious() {
|
||||
return this.changeSelection(-1);
|
||||
}
|
||||
|
||||
showForField(targetElement: HTMLElement): SuggestionsPopup {
|
||||
this.container.style.position = 'absolute';
|
||||
this.container.style.left = `${targetElement.offsetLeft}px`;
|
||||
|
||||
let topPosition = targetElement.offsetTop + targetElement.offsetHeight;
|
||||
|
||||
if (targetElement.parentElement) {
|
||||
topPosition -= targetElement.parentElement.scrollTop;
|
||||
}
|
||||
|
||||
this.container.style.top = `${topPosition}px`;
|
||||
|
||||
document.body.appendChild(this.container);
|
||||
|
||||
return this;
|
||||
}
|
||||
|
||||
onItemSelected(callback: (event: CustomEvent<TermSuggestion>) => void) {
|
||||
this.container.addEventListener('item_selected', callback as EventListener);
|
||||
}
|
||||
}
|
||||
|
||||
const cachedSuggestions = new Map<string, Promise<TermSuggestion[]>>();
|
||||
|
||||
export async function fetchSuggestions(endpoint: string, targetTerm: string) {
|
||||
const normalizedTerm = targetTerm.trim().toLowerCase();
|
||||
|
||||
if (cachedSuggestions.has(normalizedTerm)) {
|
||||
return cachedSuggestions.get(normalizedTerm)!;
|
||||
}
|
||||
|
||||
const promisedSuggestions: Promise<TermSuggestion[]> = fetch(`${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