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infiniscroll.js
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infiniscroll.js
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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
export function InfiniScroll(givenConfig) {
var _a;
const DefaultConfig = {
itemsContainerSelector: '#InfiniScrollItemsContainer',
paginationContainerSelector: '#InfiniScrollPaginationContainer',
offset: 0,
loadingText: 'Loading…',
debug: false,
};
const config = Object.assign(Object.assign({}, DefaultConfig), givenConfig);
const log = config.debug ? (_a = config.logger) !== null && _a !== void 0 ? _a : console : NullLogger();
const itemsContainerEl = document.querySelector(config.itemsContainerSelector);
const paginationContainerEl = document.querySelector(config.paginationContainerSelector);
const domParser = new window.DOMParser();
return {
start,
stop,
};
function start() {
return __awaiter(this, void 0, void 0, function* () {
if (!itemsContainerEl) {
log.error(`InfiniScroll itemsContainerSelector ${config.itemsContainerSelector} does not match any element`);
return;
}
if (!paginationContainerEl) {
log.error(`InfiniScroll paginationContainerSelector ${config.paginationContainerSelector} does not match any element`);
return;
}
addScrollListeners();
});
}
function stop() {
return __awaiter(this, void 0, void 0, function* () {
removeScrollListeners();
});
}
function addScrollListeners() {
if (!paginationContainerEl) {
return;
}
document.addEventListener('scroll', checkIfPaginationInView, { passive: true });
window.addEventListener('resize', checkIfPaginationInView, { passive: true });
window.addEventListener('orientationchange', checkIfPaginationInView, { passive: true });
}
function removeScrollListeners() {
document.removeEventListener('scroll', checkIfPaginationInView);
window.removeEventListener('resize', checkIfPaginationInView);
window.removeEventListener('orientationchange', checkIfPaginationInView);
}
function checkIfPaginationInView() {
if (!paginationContainerEl) {
return;
}
const paginationBoundingClientRect = paginationContainerEl.getBoundingClientRect();
const top = paginationBoundingClientRect.top - config.offset;
const bottom = paginationBoundingClientRect.bottom + config.offset;
const paginationInView = top <= window.innerHeight && bottom >= 0;
if (paginationInView) {
const nextPageLinkElement = paginationContainerEl.querySelector('a');
removeScrollListeners();
if (nextPageLinkElement) {
nextPageLinkElement.innerText = config.loadingText;
loadNextPage(nextPageLinkElement.href);
}
}
}
function loadNextPage(url) {
return __awaiter(this, void 0, void 0, function* () {
if (!itemsContainerEl || !paginationContainerEl) {
return;
}
const response = yield fetch(url, {
method: 'GET',
credentials: 'same-origin',
keepalive: true,
redirect: 'follow',
headers: {
Accept: 'text/html',
},
});
if (!response.ok) {
log.error('InfiniScroll: loadNextPage: ', response.status, response.statusText);
return;
}
const doc = domParser.parseFromString(yield response.text(), 'text/html');
const nextPageItemsContainer = doc.querySelectorAll(config.itemsContainerSelector)[0];
if (!nextPageItemsContainer) {
log.error(`InfiniScroll: loadNextPage: next page has no items container matching selector ${config.itemsContainerSelector}`);
return;
}
itemsContainerEl.insertAdjacentHTML('beforeend', nextPageItemsContainer.innerHTML);
const nextPagePaginationContainer = doc.querySelectorAll(config.paginationContainerSelector)[0];
if (!nextPagePaginationContainer) {
paginationContainerEl.innerHTML = '';
removeScrollListeners();
}
else {
paginationContainerEl.innerHTML = nextPagePaginationContainer.innerHTML;
start();
}
});
}
function NullLogger() {
return {
// eslint-disable-next-line @typescript-eslint/no-empty-function
error() { },
};
}
}