Remove jQuery library and use vanilla js

js/js.js

@@ -1,52 +1,96 @@
-$(document).ready(function() {
+function scrollTo(element, to, duration) {
+  var start = element.scrollTop,
+      change = to - start,
+      currentTime = 0,
+      increment = 20;
+
+  var animateScroll = function(){        
+    currentTime += increment;
+    var val = Math.easeInOutQuad(currentTime, start, change, duration);
+    element.scrollTop = val;
+    if(currentTime < duration) {
+        setTimeout(animateScroll, increment);
+    }
+  }
+  animateScroll()
+}
+
+//t = current time, b = start value, c = change in value, d = duration
+Math.easeInOutQuad = function (t, b, c, d) {
+    t /= d/2;
+    if (t < 1) return c/2*t*t + b;
+    t--;
+    return -c/2 * (t*(t-2) - 1) + b;
+}
 
 function appendLink(id) {
-    $(id).next('div').find('.link').empty();
+  let link = document.getElementById(id).nextElementSibling.querySelector('.link')
-    $(id).next('div').find('.link').append("<small>Link to this command: <a href='https://amiaopensource.github.io/ffmprovisr/index.html" + id + "'>https://amiaopensource.github.io/ffmprovisr/index.html" + id + "</a></small>");
+  if (link) {
+    link.innerHTML = ("<small>Link to this command: <a href='https://amiaopensource.github.io/ffmprovisr/index.html#" + id + "'>https://amiaopensource.github.io/ffmprovisr/index.html#" + id + "</a></small>")
+  }
 }
 
 function moveToRecipe(id) {
-    document.getElementById(id.substring(1)).checked = true;
+  document.getElementById(id).checked = true;
-    $('html, body').animate({ scrollTop: $(id).offset().top }, 1000);
+  scrollTo(document.body, 0, 1000); 
   appendLink(id)
 }
 
 // open recipe window if a hash is found in URL
 if (window.location.hash) {
-    id = window.location.hash
+  id = window.location.hash.slice(1)
   moveToRecipe(id)
 }
 
 // add hash URL when recipe is opened
-  $('label[class="recipe"]').on("click", function(){
+let recipes = document.querySelectorAll('label[class="recipe"]')
-    id = $(this).attr("for");
+recipes.forEach(function(item, i){
-    window.location.hash = ('#' + id)
+  item.addEventListener("click", function(){
-    appendLink('#' + id)
+    id = this.getAttribute("for");
+    window.location.hash = (id)
+    appendLink(id)
+  })
 })
 
+
 // open recipe when clicked
-  $('a').on("click", function(){
+let links = document.querySelectorAll('a')
-    intralink = $(this).attr("href")
+links.forEach(function(item, i){
+
+  item.addEventListener("click", function(){
+  intralink = this.getAttribute("href")
   if (intralink[0] == "#") {
-      moveToRecipe(intralink)
+    moveToRecipe(intralink.substring(1))
+  }
+})
+})
+
+
+function getCheckedBoxes(checkboxes) {
+  var checkboxesChecked = [];
+  for (var i = 0; i < checkboxes.length; i++) {
+     if (checkboxes[i].checked) {
+        checkboxesChecked.push(checkboxes[i]);
+     }
+  }
+  return checkboxesChecked.length > 0 ? checkboxesChecked : null;
+}
+
+// Collapse all recipes when button is clicked
+document.getElementById('toggle-expand-collapse-all').addEventListener("click", function(){
+  let checkboxes = document.querySelectorAll('input[type=checkbox]')
+  var checked = getCheckedBoxes(checkboxes);
+
+  if (checked) {
+    // Collapse all
+    document.querySelectorAll('input[type=checkbox]').forEach(function(item, i){
+      item.checked = false;
+      })
+  } else {
+    // Expand all
+    document.querySelectorAll('input[type=checkbox]').forEach(function(item, i){
+    item.checked = true;
+    })
   }
 })
 
-  // Collapse all recipes when button is clicked
-  $('#toggle-expand-collapse-all').on("click", function(){
-    var checkboxes = $('input[type=checkbox]');
-    var anyRecipesOpen = $(checkboxes).is(':checked');
-
-    if (anyRecipesOpen) {
-      // Collapse all
-      $('input[type=checkbox]').each(function() {
-        this.checked = false;
-      });
-    } else new Promise(function(resolve, reject) {
-      // Expand all
-      $('input[type=checkbox]').each(function() {
-        this.checked = true;
-      });
-    });
-  });
-});