Redmine - hide comments dynamically

Modify Redmine UI to toggle comments visibility on issue pages.

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name        Redmine - hide comments dynamically
// @namespace   Violentmonkey Scripts
// @match       https://www.redmine.org/issues/*
// @grant       none
// @version     1.0
// @author      bagage
// @description Modify Redmine UI to toggle comments visibility on issue pages.
// ==/UserScript==

function addButton(parent, text, ischecked, onclickcb) {
  const button = document.createElement('button');
  button.innerText = text;
  button.onclick = onclickcb;
  parent.appendChild(button);
  if (ischecked) {
    onclickcb({ target: button });
  }
  return button;
}

function addCheckbox(parent, ischecked, onclick) {
  const checkbox = document.createElement('input');
  checkbox.setAttribute('type', 'checkbox');
  checkbox.setAttribute('class', 'journal-link');
  if (ischecked) checkbox.setAttribute('checked', 1);
  checkbox.onclick = onclick;
  parent.appendChild(checkbox);
  return checkbox;
}

const h3 = document.querySelector('#history>h3');
/* do nothing if there are no comments yet */
if (!h3) {
  console.log('no comments found yet, skipping.');
  return;
}
/* add custom CSS styles */

/* make buttons sticky */
h3.style.position = 'sticky';
h3.style.top = 0;
h3.style.zIndex = 1;
document.head.appendChild(document.createElement('style')).textContent =
  'button { background-color: #ddd; text-decoration: line-through; } .button-active { background-color: #cfc; text-decoration: none; } ';
const style = document.head.appendChild(document.createElement('style'));
const hiddenStyles = ['.hidden {display:none;}', '.hidden {opacity:0.5;}'];

/* load settings */
const storageKey = 'redmine-monkey';
const issue = location.pathname.split('/')[3];
const settings = JSON.parse(localStorage.getItem(storageKey) || '{}');
if (!settings[issue]) settings[issue] = [];

/* add checkbox to toggle all comments visibility */
addButton(h3, 'Comments', settings['show_comments'] !== false, e => {
  const commentsBtn = e.target;
  const active = commentsBtn.classList.toggle('button-active');
  style.textContent = hiddenStyles[active ? 1 : 0];
  settings['show_comments'] = active;
  localStorage.setItem(storageKey, JSON.stringify(settings));
});
/* add checkbox to hide revisions */
const revisions = document.querySelector('#issue-changesets');
if (revisions) {
  addButton(h3, 'Revs', settings['show_revisions'] !== false, e => {
    const revsBtn = e.target;
    const active = revsBtn.classList.toggle('button-active');
    if (active) {
      revisions.style.display = '';
    } else {
      revisions.style.display = 'none';
    }
    settings['show_revisions'] = active;
    localStorage.setItem(storageKey, JSON.stringify(settings));
  });
  if (settings['show_revisions'] === false) revisions.style.display = 'none';
}

/* hide meta comments by default and add checkbox to hide each user comments individually */ 
document.querySelectorAll('.journal h4').forEach(h4 => {
  let journal = h4.parentElement;
  if (!journal.classList.contains(".journal"))
    journal = journal.parentElement;
  const metaComment = journal.classList.contains('has-details') && 
                      !journal.classList.contains('has-notes');
  const isHidden = settings[issue].indexOf(journal.id) !== -1 || metaComment;
  
  if (isHidden) 
    journal.classList.add('hidden');
  
  const checkbox = addCheckbox(h4, !isHidden && !metaComment, () => {
    if (checkbox.checked) {
      journal.classList.remove('hidden');
      const idx = settings[issue].indexOf(journal.id);
      settings[issue].splice(idx, 1);
    } else {
      journal.classList.add('hidden');
      settings[issue].push(journal.id);
    }
    localStorage.setItem(storageKey, JSON.stringify(settings));
  });
  if (metaComment) {
    checkbox.setAttribute('disabled', true);
  }
});