rewrite keybindings

s/shit.js

@@ -1,27 +1,22 @@
-function arrowKeys(e) {
-	switch(e.keyCode) {
-		case 39:
-			var prev = document.getElementById('prev');
-			if(prev) prev.click();
-		break;
-		case 37:
-			var next = document.getElementById('next');
-			if(next) next.click();
-		break;
-		case 82:
-			var random = document.getElementById('random');
-			if(random) random.click();
+const keybindings = {
+  'ArrowLeft': clickOnElementBinding('#next'),
+  'ArrowRight': clickOnElementBinding('#prev'),
+  'r': clickOnElementBinding('#random')
+};
+
+function clickOnElementBinding(selector) {
+  return () => {
+    let elem = document.querySelector(selector);
+    if(elem)
+      elem.click();
+  };
+}
+
+(function() {
+  document.addEventListener('keydown', e => {
+    if(e.key in keybindings) {
+      e.preventDefault();
+      keybindings[e.key]();
     }
-}
-if(document.readyState == 'complete' || document.readyState == 'loaded')
-	document.addEventListener('keydown', arrowKeys);
-else {
-	if(/Chrome/i.test(navigator.userAgent))
-		window.addEventListener('load', function () {
-			document.addEventListener('keydown', arrowKeys);
   });
-	else
-		document.addEventListener('DOMContentLoaded', function () {
-			document.addEventListener('keydown', arrowKeys);
-		});
-}
+})();