Keyboard event helper

src/keyboard.js

@@ -0,0 +1,54 @@
+const KEYCODES = {
+  13: 'enter',
+  91: 'meta',
+  16: 'shift',
+  17: 'ctrl',
+  18: 'alt',
+  37: 'left',
+  38: 'up',
+  39: 'right',
+  40: 'down',
+  9: 'tab',
+  27: 'esc'
+};
+
+const handlers = {};
+
+function bind() {
+  $(document).on('keydown', handler);
+}
+
+function handler(e) {
+  let key = KEYCODES[e.keyCode];
+
+  if (e.shiftKey && key !== 'shift') {
+    key = 'shift+' + key;
+  }
+
+  if ((e.ctrlKey && key !== 'ctrl') || (e.metaKey && key !== 'meta')) {
+    key = 'ctrl+' + key;
+  }
+
+  const _handlers = handlers[key];
+
+  if (_handlers && _handlers.length > 0) {
+    _handlers.map(h => h());
+
+    if (!e.isDefaultPrevented()) {
+      e.preventDefault();
+    }
+  }
+}
+
+bind();
+
+export default {
+  on(key, handler) {
+    const keys = key.split(',').map(k => k.trim());
+
+    keys.map(key => {
+      handlers[key] = handlers[key] || [];
+      handlers[key].push(handler);
+    });
+  }
+};