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import select from 'select-dom';
import debounce from 'debounce-fn';
import features from '../libs/features';
import observeEl from '../libs/simplified-element-observer';
let btn: HTMLButtonElement;
const loadMore = debounce(() => {
btn.click();
btn.textContent = 'Loading...';
// If GH hasn't loaded the JS, the click will not load anything.
// We can detect if it worked by looking at the button's state,
// and then trying again (auto-debounced)
if (!btn.disabled) {
loadMore();
}
}, {wait: 200});
const inView = new IntersectionObserver(([{isIntersecting}]) => {
if (isIntersecting) {
loadMore();
} else {
// The button may have been changed after it's gone out of view, so try finding it again
findButton();
}
}, {
rootMargin: '500px' // https://github.com/sindresorhus/refined-github/pull/505#issuecomment-309273098
});
const findButton = (): void => {
// If the old button is still there, leave
if (btn && document.contains(btn)) {
return;
}
// Forget the old button
inView.disconnect();
// Watch the new button, or stop everything
btn = select<HTMLButtonElement>('.ajax-pagination-btn')!;
if (btn) {
inView.observe(btn);
}
};
function init(): void {
const form = select('.ajax-pagination-form');
if (form) {
// If GH hasn't loaded the JS,
// the fake click will submit the form without ajax.
form.addEventListener('submit', event => event.preventDefault());
observeEl('#dashboard .news', findButton);
}
}
features.add({
id: __featureName__,
description: 'Automagically expands the newsfeed when you scroll down.',
screenshot: false,
include: [
features.isDashboard
],
load: features.onDomReady,
init
});
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