Add model and add event listeners

src/nodes/EnumNode.ts

@@ -1,4 +1,6 @@
 import { AbstractNode, NodeMods } from './AbstractNode'
+import { DataModel } from '../model/DataModel'
+import { Path } from '../model/Path'
 
 export class EnumNode extends AbstractNode<string> {
   protected options: string[]
@@ -8,10 +10,13 @@ export class EnumNode extends AbstractNode<string> {
     this.options = options
   }
 
-  render (field: string, value: string) {
-    return `<span>${field}</span>
+  updateModel(el: Element, path: Path, model: DataModel) {
+  }
+
+  render(path: Path, value: string, model: DataModel) {
+    return this.wrap(path, model, `<span>${path.last()}</span>
     <select value="${value}">
       ${this.options.map(o => `<option>${o}</option>`)}
-    </select>`
+    </select>`)
   }
 }