fix event handling to support webvr and webxr controller apis

Author: dbradleyfl

index.js

@@ -230,8 +230,10 @@ AFRAME.registerComponent('teleport-controls', {
   })(),
 
   handleAxis: function (evt) {
-    const axisX = parseInt(evt.detail.axis[2] * 10)
-    const axisY = parseInt(evt.detail.axis[3] * 10)
+    if (!evt.detail.axis || !evt.detail.axis.length) return 
+    const xr = evt.detail.axis.length === 4
+    const axisX = parseInt(evt.detail.axis[xr ? 2 : 0] * 10)
+    const axisY = parseInt(evt.detail.axis[xr ? 3 : 1] * 10)
     if (axisX === 0 && axisY === 0) {
       this.onButtonUp(evt)
     } else if (Math.abs(axisX) <= 1 && axisY === -9) {