Changes for WebMIDI compatibility on iOS

html/assets/scripts/midi.js

@@ -1,7 +1,8 @@
 // prepare svg object for later use
 var keyboard = document.getElementById("piano");
 var svgDoc; // loaded keyboard svg
-const keysB = [2,5,7,10,12,14,17,19,22,24,26,29,31,34,36,38,41,43,46,48,50,53,55,58,60,62,65,67,70,72,74,77,79,82,84,86]
+var midiAccess = null;
+const black_keys = [2,5,7,10,12,14,17,19,22,24,26,29,31,34,36,38,41,43,46,48,50,53,55,58,60,62,65,67,70,72,74,77,79,82,84,86] 
 
 window.addEventListener("load", function() {
     svgDoc = keyboard.contentDocument;
@@ -12,39 +13,72 @@ function setKeyState(note, state) {
     let key = svgDoc.getElementById(String(note));
     if (state) {
         key.style.fill = "red";
-    } else if (keysB.includes(note)) {
+    } else if (black_keys.includes(note)) {
         key.style.fill = "black";
     } else {
         key.style.fill = "white";
     }
 }
 
-// Check if browser supports MIDI
+/**
-if (!navigator.requestMIDIAccess) {
+ * Establishes MIDI connection
-    console.log('WebMIDI is not supported in this browser. Or Site was not opened via HTTPS');
+ */
-}
+function midiSetup() {
-
+    // Check if MIDI connection is possible at all
-// Attempt to establish a connection to the MIDI device
+    if (!navigator.requestMIDIAccess) {
-navigator.requestMIDIAccess()
+        alert('WebMIDI is not supported in this browser. Or Site was not accessed via HTTPS');
-    .then(onMIDISuccess, onMIDIFailure);
+        return
-
-function onMIDISuccess(midiAccess) {
-    console.log(midiAccess);
-
-    for (var input of midiAccess.inputs.values()) {
-        input.onmidimessage = getMIDIMessage;
     }
+    // Attempt to establish a MIDI connection. Handle success or failure
+    console.log("1231234");
+    window.navigator.requestMIDIAccess().then(onMIDISuccess, onMIDIFailure);
+    console.log("4321321");
 }
 
+/**
+ * Handle successful MIDI connection
+ * @param {*} midiAccess 
+ */
+function onMIDISuccess(access) {
+    midiAccess = access;
+    console.log("access successful");
+
+    var input_list = [];
+
+    var iter = midiAccess.inputs.values();
+    for (let obj = iter.next(); !obj.done; obj = iter.next()) {
+        input_list.push(obj.value);
+    }
+
+    // Add event listener do all devices
+    for (var i = 0; i < input_list.length; i++) {
+        input_list[i].onmidimessage = getMIDIMessage;
+        console.log("amogus");
+    }
+
+}
+
+/**
+ * Handle MIDI failure
+ */
 function onMIDIFailure() {
-    console.log('Could not access your MIDI devices.');
+    let message = "Failed to access your MIDI device";
+    console.log(message);
+    alert(message);
 }
 
+/**
+ * Handle incoming MIDI Messages
+ * @param {*} midiMessage 
+ */
 function getMIDIMessage(midiMessage) {
+    console.log("sugoma");
     var command  = midiMessage.data[0];
     var note     = midiMessage.data[1] - 20; // sorry midi standard
     var velocity = (midiMessage.data.length > 2) ? midiMessage.data[2] : 0;
-    
+
+    console.log(`MIDI{ command : ${command}, note : ${note}, velocity : ${velocity}}`);
+
     if (command == 144){
         console.log(note);
         if (velocity == 0) {
@@ -55,4 +89,7 @@ function getMIDIMessage(midiMessage) {
             task.changeKeyState(note,true);
         }
     }
-}
+}
+
+// code executed on include
+window.onload = (x) => { midiSetup(); }