web_src/js/features/comp/ReactionSelector.ts


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import {POST} from '../../modules/fetch.ts';
import type {DOMEvent} from '../../utils/dom.ts';
import {registerGlobalEventFunc} from '../../modules/observer.ts';

export function initCompReactionSelector() {
  registerGlobalEventFunc('click', 'onCommentReactionButtonClick', async (target: HTMLElement, e: DOMEvent<MouseEvent>) => {
    // there are 2 places for the "reaction" buttons, one is the top-right reaction menu, one is the bottom of the comment
    e.preventDefault();

    if (target.classList.contains('disabled')) return;

    const actionUrl = target.closest('[data-action-url]').getAttribute('data-action-url');
    const reactionContent = target.getAttribute('data-reaction-content');

    const commentContainer = target.closest('.comment-container');

    const bottomReactions = commentContainer.querySelector('.bottom-reactions'); // may not exist if there is no reaction
    const bottomReactionBtn = bottomReactions?.querySelector(`a[data-reaction-content="${CSS.escape(reactionContent)}"]`);
    const hasReacted = bottomReactionBtn?.getAttribute('data-has-reacted') === 'true';

    const res = await POST(`${actionUrl}/${hasReacted ? 'unreact' : 'react'}`, {
      data: new URLSearchParams({content: reactionContent}),
    });

    const data = await res.json();
    bottomReactions?.remove();
    if (data.html) {
      commentContainer.insertAdjacentHTML('beforeend', data.html);
    }
  });
}