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tildes-reextended/source/ts/scripts/jump-to-new-comment.ts

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2019-11-10 17:38:47 +00:00
import {
getSettings,
Settings,
createElementFromString,
querySelector
} from '../utilities';
(async (): Promise<void> => {
const settings: Settings = await getSettings();
if (
!settings.features.jumpToNewComment ||
!window.location.pathname.startsWith('/~') ||
document.querySelectorAll('.comment.is-comment-new').length === 0
) {
return;
}
// Create the Jump To New Comment button.
const jumpToNewCommentButton: HTMLAnchorElement = createElementFromString(
'<a id="trx-jump-to-new-comment" class="btn btn-primary">Jump To New Comment</a>'
);
jumpToNewCommentButton.addEventListener('click', clickHandler);
document.body.append(jumpToNewCommentButton);
})();
let previousComment: HTMLElement | null = null;
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function clickHandler(): void {
if (previousComment !== null) {
previousComment.classList.remove('is-comment-new');
}
// If there's no new comments left, remove the button.
if (document.querySelectorAll('.comment.is-comment-new').length === 0) {
const jumpToNewCommentButton: HTMLAnchorElement = querySelector(
'#trx-jump-to-new-comment'
);
jumpToNewCommentButton.remove();
}
const newestComment: HTMLElement | null = document.querySelector(
'.comment.is-comment-new'
);
if (newestComment === null) {
return;
}
// If the newest comment is invisible, expand all comments to make it visible.
if (newestComment.offsetParent === null) {
// TODO: Instead of expanding all comments, only expand the ones necessary
// to make the comment visible.
const expandAllButton: HTMLButtonElement = querySelector(
'[data-js-comment-expand-all-button]'
);
expandAllButton.click();
}
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newestComment.scrollIntoView({behavior: 'smooth'});
previousComment = newestComment;
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}