sm-userscripts/sugoi_filter_toggle.user.js

// ==UserScript==
// @name         SugoiMusic Filter Toggle
// @namespace    http://sugoimusic.me
// @version      0.1
// @description  Modifies filter bar behavior on artist pages so that mutiple categories can be selected
// @author       herbert
// @icon         https://sugoimusic.me/favicon.ico
// @match        https://sugoimusic.me/artist.php?id=*
// @grant        none
// ==/UserScript==

function filter(e){
  if (e.getAttribute('selected') === 'true'){
      hideCategory(e);
  } else {
      showCategory(e);
  }
  apply_torrent_table_styling();
}

function showAll(e){
  let filterCats = document.querySelectorAll('li[id^="nav"]>a.filter-cat');
  console.log(filterCats);
  for (let element of filterCats){
      console.log(element);
      showCategory(element);
  }
  apply_torrent_table_styling();
}

function hideCategory(e) {
  let className = e.parentElement.getAttribute('id').replace('nav_','');
  if (e.closest('#discog_table')){
      $('.non_contrib_table .'+className).ghide();
  } else {
      $('.contrib_table .'+className).ghide();
  }
  e.setAttribute('selected',false);
  e.style.fontWeight = 'normal';
}

function showCategory(e) {
  let className = e.parentElement.getAttribute('id').replace('nav_','');
  if (e.closest('#discog_table')){
      $('.non_contrib_table .'+className).gshow();
  } else {
      $('.contrib_table .'+className).gshow();
  }
  e.setAttribute('selected',true);
  e.style.fontWeight = 'bold';
}

(function() {
  'use strict';
  let filterAll = document.querySelector('a#nav_all');
  filterAll.removeAttribute('onclick');
  filterAll.setAttribute('href','#/');
  filterAll.addEventListener('click',function(){
      showAll(this);
  });

  let filterCats = document.querySelectorAll('li[id^="nav"]>a.filter-cat');
  for (let element of filterCats){
      element.removeAttribute('onclick');
      element.setAttribute('selected',true);
      element.setAttribute('href','#/');
      element.style.fontWeight = 'bold';
      element.addEventListener('click',function(event){
          filter(this);
      });
  }
})();