Proper (yet more complex) volume calculation. Now changing the volume slider also takes into account the crossfader coef.

css/main.css

@@ -1,6 +1,7 @@
 :root {
   --bg-color: #223;
   --text-color: #eee;
+  --text-color-light: #bbb;
   --accent-color-1: #ff91d8;
   --accent-color-1-light: #ffcdff;
   --accent-color-2: #ffff7d;
@@ -112,16 +113,43 @@ iframe {
   width: 50%;
 }
 
+
+.control-label {
+  font-size: 0.8em;
+
+  margin: auto;
+  color: var(--text-color-light);
+}
+
+.control-label span {
+  color: var(--accent-color-2);
+}
+
+.volume-control {
+  padding-top: 1em;
+}
+.volume-control .control-label {
+  width: 5em;
+  padding-top: 1em;
+  /* transform: rotate(270deg); */
+  text-align: center;
+}
+
+span.volume-value {
+  color: var(--text-color-light);
+}
+
 .speed-control {
   width: 20%;
+  height: auto;
   /* margin: auto; */
   display: flex;
   flex-direction: column;
+  justify-content: center;
 }
 
-.speed-control span {
-  font-size: 0.8em;
-  margin: auto;
+.speed-control .control-label {
+  margin: 0.2em auto;
 }
 
 .speed-slider {

index.html

@@ -32,17 +32,23 @@
         <iframe id="playerA" src="" width="480" height="270", frameborder='0'></iframe>
         <input class='load-button'  type="button" value="Load new track or playlist">
         <div class="speed-control">
-          <span class='speed-value'></span>
           <input type="range" class='speed-slider' name="speedRate" value="1" min='0.25' max='2' step='0.25'>
+          <p class='control-label'>Speed: <span class='speed-value'></span></p>
+        </div>
+        <div class="volume-control">
+          <input type="range" class='volume-slider' min='0' max = '100' value="80">
+          <p class='control-label'>Vol: <span class="volume-slider-value"></span> (<span class="volume-value"></span>)</p>
         </div>
-        <input type="range" class="volume-slider" min='0' max = '100' value="80">
       </div>
       <div class="player">
         <iframe id="playerB" src="" width="480" height="270", frameborder='0'></iframe>
+        <div class="volume-control">
           <input type="range" class='volume-slider' min='0' max = '100' value="80">
+          <p class='control-label'>Vol: <span class="volume-slider-value"></span> (<span class="volume-value"></span>)</p>
+        </div>
         <div class="speed-control">
-          <span class='speed-value'></span>
           <input type="range" class='speed-slider' name="speedRate" value="1" min='0.25' max='2' step='0.25'>
+          <p class='control-label'>Speed: <span class='speed-value'></span></p>
         </div>
         <input class='load-button' type="button" value="Load new track or playlist">
       </div>

js/main.js

@@ -4,27 +4,26 @@ tag.src = 'https://www.youtube.com/iframe_api';
 let firstScriptTag = document.getElementsByTagName('script')[0];
 firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
 
+//THE DJ CROSSFADER!!!
 let crossfader = document.querySelector('#crossfader');
 
 class player {
   trackID;
-  // volume;
-  // id;
-  // iframe;
   player;
-  // node;
+  crossfaderCoef;
+
   constructor(id) {
     this.id = id;
     this.iframe = document.querySelector('#'+this.id);
-    // console.log('#'+this.id);
-    // console.log(this.iframe);
-    // this.volume = vol;
 
     this.node = this.iframe.parentNode;
     this.volume = this.node.querySelector('.volume-slider').value;
+    this.volSliderVal = this.node.querySelector('.volume-slider-value');
+    this.volVal = this.node.querySelector('.volume-value')
+    this.volSliderVal.innerHTML = this.volume + '%';
     this.loadButton = this.node.querySelector('.load-button');
     this.speedSlider = this.node.querySelector('.speed-slider');
-    this.speedSlider.previousElementSibling.innerHTML = 'Speed: ' + this.speedSlider.value;
+    this.speedSlider.nextElementSibling.querySelector('.speed-value').innerHTML = this.speedSlider.value;
   }
 
   init(trackID) {
@@ -40,17 +39,12 @@ class player {
     });
   }
   onPlayerReady(e) {
-    // console.log(e.target);
-    // this.node.querySelector('.volumeSlider').value = this.player.getVolume();
-    // e.target.playVideo();
-    // console.log(e.target);
-    // e.target.setVolume(this.volume);
     this.player.setVolume(this.volume);
 
     this.node.querySelector('.volume-slider').addEventListener('input', (e) => {
-      let volume = e.target.value;
-      this.volume = volume;
-      this.player.setVolume(volume);
+      this.volume = e.target.value;
+      this.volSliderVal.innerHTML = this.volume + '%';
+      this.volumeUpdate();
     });
 
     this.loadButton.addEventListener('click', () => {
@@ -72,11 +66,11 @@ class player {
     });
 
     this.speedSlider.addEventListener('input', (e) => {
-      this.speedSlider.previousElementSibling.innerHTML =  'Speed: ' + e.target.value;
+      this.speedSlider.nextElementSibling.querySelector('.speed-value').innerHTML = e.target.value;
       this.player.setPlaybackRate(Number(e.target.value));
     });
 
-    // updateCrossfader(crossfader.value); //Throws an error at the beginning because the second player is not ready yet.
+    this.volumeUpdate();
   }
 
   onPlayerStateChange(e) {
@@ -103,6 +97,12 @@ class player {
     });
   }
 
+  volumeUpdate() {
+    let outputVolume = Math.round(this.volume * this.crossfaderCoef);
+    this.player.setVolume(outputVolume);
+    this.volVal.innerHTML = outputVolume + '%';
+  }
+
 
 }
 
@@ -116,38 +116,65 @@ function onYouTubeIframeAPIReady() {
   playerB.init('PhEuAuhH418');
 }
 
-// while (bothPlayersReady < 2) {
-//
-// }
-crossfader.addEventListener('input', (e) => {
+calcCrossfaderCoefs(crossfader.value);
 
+crossfader.addEventListener('input', (e) => {
+  //Makes the slider stick on the middle
   if (Math.abs(crossfader.value - 500) < 15) {
     crossfader.value = 500;
   }
 
-  updateCrossfader(crossfader.value);
-});
+  calcCrossfaderCoefs(crossfader.value);
 
-//
+  let boxShadowStyle = '0 0 3em #ddbddd'
+  playerA.iframe.style.boxShadow = boxShadowStyle + componentToHex(Math.round(playerA.crossfaderCoef*255));
+  playerB.iframe.style.boxShadow = boxShadowStyle + componentToHex(Math.round(playerB.crossfaderCoef*255));
 
+  playerA.volumeUpdate();
+  playerB.volumeUpdate();
 
-function updateCrossfader(input) {
-  let normVal = crossfader.value / 1000;
+  // updateCrossfader(crossfader.value);
+});
 
-  // let coefB = normVal ** 2;
-  // let coefA = (1 - normVal) ** 2;
+function calcCrossfaderCoefs(input) {
+  let normVal = input / 1000;
+
+  //Classic 'transition' curve
   let coefB = Math.min(normVal*2, 1);
   let coefA = Math.min((1-normVal)*2, 1);
 
+  //Cheap smooth curve
+  // let coefB = normVal ** 2;
+  // let coefA = (1 - normVal) ** 2;
 
-  // Sets box-shadow transparency depending on crossfader position
-  let boxShadowStyle = '0 0 3em #ddbddd'
-  playerA.iframe.style.boxShadow = boxShadowStyle + componentToHex(Math.round(coefA*255));
-  playerB.iframe.style.boxShadow = boxShadowStyle + componentToHex(Math.round(coefB*255));
+  //Amplitude-preserving curve (but not power)
+  // let coefB = (normVal ** 2) * (3 - 2 * normVal);
+  // let coefA = 1 - coefB;
 
-  playerA.player.setVolume(playerA.volume * coefA);
-  playerB.player.setVolume(playerB.volume * coefB);
+  // return [coefA, coefB];
+  playerA.crossfaderCoef = coefA;
+  playerB.crossfaderCoef = coefB;
 }
+//
+
+
+// function updateCrossfader(input) {
+//   let normVal = crossfader.value / 1000;
+//
+//   // let coefB = normVal ** 2;
+//   // let coefA = (1 - normVal) ** 2;
+//   let coefB = Math.min(normVal*2, 1);
+//   let coefA = Math.min((1-normVal)*2, 1);
+//
+//
+//   // Sets box-shadow transparency depending on crossfader position
+//   let boxShadowStyle = '0 0 3em #ddbddd'
+//   playerA.iframe.style.boxShadow = boxShadowStyle + componentToHex(Math.round(coefA*255));
+//   playerB.iframe.style.boxShadow = boxShadowStyle + componentToHex(Math.round(coefB*255));
+//
+//   playerA.player.setVolume(playerA.volume * coefA);
+//   playerB.player.setVolume(playerB.volume * coefB);
+// }
 
 // From https://thomaspark.co/projects/needledrop/ by Thomas Park
 // function getYouTubeID(url){