support short-hand data expressions

src/Mite.js

@@ -107,8 +107,9 @@ export class Mite {
                                 try {
                                     const handler = new Function(
                                         "event",
-                                        `with (this.data) { ${exprContent}; }`
+                                        `with (this.data) { ${exprContent.replace(/(\w+)/g, (match) => this.data[match] ? `${match}.value` : match)}; }`
                                     ).bind(this);
+
                                     node.addEventListener(eventName, handler);
                                 } catch (e) {
                                     console.error(`Invalid expression in ${attr.name}: ${exprContent}`, e);