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// SPDX-License-Identifier: AGPL-3.0-or-later
/* global searxng */
searxng.ready(function () {
'use strict';
searxng.infinite_scroll_supported = (
'IntersectionObserver' in window &&
'IntersectionObserverEntry' in window &&
'intersectionRatio' in window.IntersectionObserverEntry.prototype);
if (searxng.endpoint !== 'results') {
return;
}
if (!searxng.infinite_scroll_supported) {
console.log('IntersectionObserver not supported');
return;
}
let d = document;
var onlyImages = d.getElementById('results').classList.contains('only_template_images');
function newLoadSpinner () {
var loader = d.createElement('div');
loader.classList.add('loader');
return loader;
}
function replaceChildrenWith (element, children) {
element.textContent = '';
children.forEach(child => element.appendChild(child));
}
function loadNextPage (callback) {
var form = d.querySelector('#pagination form.next_page');
if (!form) {
return
}
replaceChildrenWith(d.querySelector('#pagination'), [ newLoadSpinner() ]);
var formData = new FormData(form);
searxng.http('POST', d.querySelector('#search').getAttribute('action'), formData).then(
function (response) {
var nextPageDoc = new DOMParser().parseFromString(response, 'text/html');
var articleList = nextPageDoc.querySelectorAll('#urls article');
var paginationElement = nextPageDoc.querySelector('#pagination');
d.querySelector('#pagination').remove();
if (articleList.length > 0 && !onlyImages) {
// do not add <hr> element when there are only images
d.querySelector('#urls').appendChild(d.createElement('hr'));
}
articleList.forEach(articleElement => {
d.querySelector('#urls').appendChild(articleElement);
});
if (paginationElement) {
d.querySelector('#results').appendChild(paginationElement);
callback();
}
}
).catch(
function (err) {
console.log(err);
var e = d.createElement('div');
e.textContent = searxng.settings.translations.error_loading_next_page;
e.classList.add('dialog-error');
e.setAttribute('role', 'alert');
replaceChildrenWith(d.querySelector('#pagination'), [ e ]);
}
)
}
if (searxng.settings.infinite_scroll && searxng.infinite_scroll_supported) {
const intersectionObserveOptions = {
rootMargin: "20rem",
};
const observedSelector = 'article.result:last-child';
const observer = new IntersectionObserver(entries => {
const paginationEntry = entries[0];
if (paginationEntry.isIntersecting) {
observer.unobserve(paginationEntry.target);
loadNextPage(() => observer.observe(d.querySelector(observedSelector), intersectionObserveOptions));
}
});
observer.observe(d.querySelector(observedSelector), intersectionObserveOptions);
}
});
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