feat(input): Allow user to clear input and be valid if not required

Update parsers, fomatter, and validator to handle empty values and treat them as valid.

.travis.yml

@@ -16,6 +16,7 @@ script:
   - npm run test
 after_success:
   - npm run semantic-release
+  - npm run coverage:upload
 branches:
   except:
     - "/^v\\d+\\.\\d+\\.\\d+$/"

README.md

@@ -3,7 +3,14 @@
 
 Native AngularJS directive that allows user input of a date/time value. Valid dates are displayed in specified format, but input may be in any supported format.
 
+[![MIT License][license-image]][license-url]
 [![Build Status](https://travis-ci.org/dalelotts/angular-date-time-input.png?branch=master)](https://travis-ci.org/dalelotts/angular-date-time-input)
+[![Coverage Status](https://coveralls.io/repos/github/dalelotts/angular-date-time-input/badge.svg?branch=master)](https://coveralls.io/github/dalelotts/angular-date-time-input?branch=master)
+[![Dependency Status](https://david-dm.org/dalelotts/angular-date-time-input.svg)](https://david-dm.org/dalelotts/angular-date-time-input)
+[![devDependency Status](https://david-dm.org/dalelotts/angular-date-time-input/dev-status.svg)](https://david-dm.org/dalelotts/angular-date-time-input#info=devDependencies)
+[![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)
+[![Commitizen friendly](https://img.shields.io/badge/commitizen-friendly-brightgreen.svg)](http://commitizen.github.io/cz-cli/)
+
 
 #Dependencies
 

demo/index.html

@@ -68,7 +68,7 @@
             Input format is 'YYYY/MM/DD hh:mm A', 'YYYY/MM/DD', or 'MMM DD YYYY' (and ISO 8601, which is always supported).
             <br> Input parsing is strict (meaning input must exactly match one of input formats).
             <br> Display format is 'YYYY/MM/DD hh:mm A'.
-            <br>Stored as a date: {{ data.date1 }}
+            <br>Stored as a date: {{ data.date2 }}
         </p>
         <div class="alert alert-info" role="alert">
             <strong>Try these</strong>
@@ -94,7 +94,7 @@
             <br> <strong>Input parsing is NOT strict</strong> (in this case, the moment parser is very, very forgiving - entering only
             '1' will likely result in a valid date).
             <br> Display format is 'YYYY/MMM/DD hh:mm A'.
-            <br>Stored as: {{ data.date1 }}
+            <br>Stored as: {{ data.date3 }}
         </p>
         <div class="alert alert-info" role="alert">
             <strong>Non-strict parsing</strong> is very forgiving and can result in some unexpected behavior.

karma.conf.js

@@ -43,8 +43,9 @@ module.exports = function (config) {
     // optionally, configure the reporter
     coverageReporter: {
       reporters: [
-        {type: 'json', dir: 'build/coverage/'},
-        {type: 'html', dir: 'build/coverage/'}
+        {type: 'lcov', dir: 'build/coverage'},
+        {type: 'json', dir: 'build/coverage'},
+        {type: 'html', dir: 'build/coverage'}
       ]
     },
 

package.json

@@ -20,8 +20,9 @@
   },
   "devDependencies": {
     "angular-mocks": "^1.x",
+    "coveralls": "^2.11.6",
     "cz-conventional-changelog": "^1.1.5",
-    "grunt": "^0.4.4",
+    "eslint": "^2.2.0",
     "grunt-bump": "^0.7.0",
     "gulp": "^3.8.11",
     "gulp-htmlmin": "^1.3.0",
@@ -31,24 +32,24 @@
     "jquery": "^2.2.0",
     "jshint": "^2.9.1",
     "jshint-stylish": "^2.1.0",
-    "karma": "^0.13.19",
+    "karma": "^0.13.21",
     "karma-chrome-launcher": "^0.2.2",
     "karma-coverage": "^0.5.3",
     "karma-firefox-launcher": "^0.1.7",
-    "karma-jasmine": "^0.3.2",
+    "karma-jasmine": "^0.3.7",
     "karma-phantomjs-launcher": "^1.0.0",
     "karma-threshold-reporter": "^0.1.12",
-    "lodash": "^4.1.0",
-    "matchdep": "^1.0.0",
-    "phantomjs-prebuilt": "^2.1.3",
+    "lodash": "^4.5.0",
+    "phantomjs-prebuilt": "^2.1.4",
     "plato": "^1.5.0",
     "run-browser": "^2.0.2",
     "semantic-release": "^6.2.0",
-    "standard": "^5.4.1",
+    "standard": "^6.0.7",
     "tape": "^4.4.0"
   },
   "scripts": {
     "test": "npm run test-browserify && gulp",
+    "coverage:upload": "cat build/coverage/*/lcov.info | coveralls",
     "test-browserify": "run-browser test/commonjs/browserify.test.js -b",
     "semantic-release": "semantic-release pre && npm publish && semantic-release post"
   },

src/dateTimeInput.js

@@ -2,7 +2,7 @@
 /*jslint vars:true */
 
 /**
- * @license angular-date-time-input  version: 0.1.0
+ * @license angular-date-time-input
  * (c) 2013-2015 Knight Rider Consulting, Inc. http://www.knightrider.com
  * License: MIT
  *
@@ -35,20 +35,30 @@
 			// Behaviors
 			switch (modelType) {
 				case 'Date':
-					result = dateParser;
+					result = handleEmpty(dateParser);
 					break;
 				case 'moment':
-					result = momentParser;
+					result = handleEmpty(momentParser);
 					break;
 				case 'milliseconds':
-					result = millisecondParser;
+					result = handleEmpty(millisecondParser);
 					break;
 				default: // It is assumed that the modelType is a formatting string.
-					result = stringParserFactory(modelType);
+					result = handleEmpty(stringParserFactory(modelType));
 			}
 
 			return result;
 
+			function handleEmpty(delegate) {
+				return function (viewValue) {
+					if (angular.isUndefined(viewValue) || viewValue === '' || viewValue === null) {
+						return null;
+					} else {
+						return delegate(viewValue);
+					}
+				};
+			}
+
 			function dateParser(viewValue) {
 				return momentParser(viewValue).toDate();
 			}
@@ -118,20 +128,23 @@
 			}
 
 			function validator(modelValue, viewValue) {
-				return angular.isDefined(viewValue) ? moment(viewValue, inputFormats, moment.locale(), dateParseStrict).isValid() : true;
+				if (angular.isUndefined(viewValue) || viewValue === '' || viewValue === null) {
+					return true;
+				}
+				return moment(viewValue, inputFormats, moment.locale(), dateParseStrict).isValid();
 			}
 
 			function formatter(modelValue) {
+				if (angular.isUndefined(modelValue) || modelValue === '' || modelValue === null) {
+					return null;
+				}
 
 				if (angular.isDate(modelValue)) {
 					return moment(modelValue).format(displayFormat);
 				} else if (angular.isNumber(modelValue)) {
 					return moment.utc(modelValue).format(displayFormat);
-				} else if (angular.isDefined(modelValue)) {
-					return moment(modelValue, inputFormats, moment.locale(), dateParseStrict).format(displayFormat);
 				}
-
-				return modelValue;
+				return moment(modelValue, inputFormats, moment.locale(), dateParseStrict).format(displayFormat);
 			}
 
 			function applyFormatters() {