Validate number entry.

This validates the number entry and clears it after submitting.

Author: coderkevin

examples/simple/containers/App.jsx

@@ -19,6 +19,7 @@ class App extends Component {
 		e.preventDefault();
 
 		const { numberEntry } = this.props;
+		this.props.dispatch( setNumberEntry( '' ) );
 		this.props.dispatch( addNumber( numberEntry ) );
 	}
 

examples/simple/reducers/index.js

@@ -11,12 +11,21 @@ import {
 function numberEntry( state = '', action ) {
 	switch ( action.type ) {
 		case SET_NUMBER_ENTRY:
-			return action.number;
+			if ( '' === action.number || isNormalInteger( action.number ) ) {
+				return action.number;
+			} else {
+				// Note: Could set an error state here for user validation.
+				return state;
+			}
 		default:
 			return state;
 	}
 }
 
+function isNormalInteger( str ) {
+	return /^\+?(0|[1-9]\d*)$/.test( str );
+}
+
 const primesInitialState = {
 	primes: [],
 	nonPrimes: [],