82 lines
2.2 KiB
TypeScript
82 lines
2.2 KiB
TypeScript
import {html} from 'htm/preact';
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import {Component} from 'preact';
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import {log, querySelector, querySelectorAll} from '../utilities/exports.js';
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type Props = Record<string, unknown>;
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type State = {
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hidden: boolean;
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newCommentCount: number;
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previousComment: HTMLElement | undefined;
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};
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export class JumpToNewCommentFeature extends Component<Props, State> {
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constructor() {
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super();
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const newCommentCount = querySelectorAll('.comment.is-comment-new').length;
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this.state = {
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hidden: false,
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newCommentCount,
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previousComment: undefined,
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};
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if (newCommentCount === 0) {
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log('Jump To New Comment: 0 new comments found, not doing anything.');
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} else {
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log(
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`Jump To New Comment: Initialized for ${newCommentCount} new comments.`,
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);
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}
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}
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jump = () => {
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// Remove the new comment style from the previous
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// jumped comment if there is one.
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this.state.previousComment?.classList.remove('is-comment-new');
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const newestComment = document.querySelector<HTMLElement>(
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'.comment.is-comment-new',
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);
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// If there are no new comments left, hide the button.
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if (newestComment === null) {
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log('Jump To New Comment: Final comment reached, hiding the button.');
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this.setState({hidden: true});
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return;
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}
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// If the newest comment is invisible, expand all comments to make it visible.
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if (newestComment.offsetParent === null) {
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querySelector<HTMLElement>('[data-js-comment-expand-all-button]').click();
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}
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newestComment.scrollIntoView({behavior: 'smooth'});
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this.setState({previousComment: newestComment});
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};
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render() {
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const newCommentCount = this.state.newCommentCount;
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// If there are no new comments, don't render anything.
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if (newCommentCount === 0) {
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return;
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}
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const commentsLeft = querySelectorAll('.comment.is-comment-new').length;
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const hidden = this.state.hidden ? 'trx-hidden' : '';
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return html`
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<a
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id="trx-jump-to-new-comment"
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class="btn btn-primary ${hidden}"
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onClick="${this.jump}"
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>
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Jump To New Comment (${commentsLeft}/${this.state.newCommentCount})
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</a>
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`;
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}
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}
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