Fix ES6 constructor for handleSubmit in lessons 12-14

Author: hajush

lessons/12-navigating/README.md

@@ -13,7 +13,13 @@ import NavLink from './NavLink';
 
 class Repos extends React.Component{
 
-  // add this method
+  // add this method and handleSubmit below
+  constructor() {
+    super();
+    this.handleSubmit = this.handleSubmit.bind(this);
+  }
+
+  // add this method too
   handleSubmit(event) {
     event.preventDefault();
     const userName = event.target.elements[0].value;
@@ -45,6 +51,9 @@ class Repos extends React.Component{
 }
 ```
 
+View the page and test the form submission. We won't make any further changes
+to the code in this lesson, but we'll look at how navigate programmatically.
+
 There are two ways you can do this, the first is simpler than the
 second.
 
@@ -80,7 +89,7 @@ class Router extends React.Component {
 
   handleSubmit(event) {
     // ...
-    this.context.router.push(path)
+    this.context.router.push(path);
   }
 
   // ..

lessons/13-server-rendering/README.md

@@ -94,7 +94,7 @@ import Repos from './Repos';
 import Repo from './Repo';
 import Home from './Home';
 
-module.exports = (
+export default (
   <Route path="/" component={App}>
     <IndexRoute component={Home}/>
     <Route path="/repos" component={Repos}>

lessons/13-server-rendering/modules/Repos.js

@@ -3,6 +3,11 @@ import NavLink from './NavLink';
 
 class Repos extends React.Component {
 
+  constructor() {
+    super();
+    this.handleSubmit = this.handleSubmit.bind(this);
+  }
+
   handleSubmit(event) {
     event.preventDefault();
     const userName = event.target.elements[0].value;

lessons/14-whats-next/modules/Repos.js

@@ -3,6 +3,11 @@ import NavLink from './NavLink';
 
 class Repos extends React.Component {
 
+  constructor() {
+    super();
+    this.handleSubmit = this.handleSubmit.bind(this);
+  }
+
   handleSubmit(event) {
     event.preventDefault();
     const userName = event.target.elements[0].value;