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Input with month validation and transformation. In browsers that do not yet support the HTML5 month input, a text element will be used. In that case, the text must be entered in a valid ISO-8601 month format (yyyy-MM), for example: `2009-01`.

The model must always be a Date object, otherwise Angular will throw an error. Invalid `Date` objects (dates whose `getTime()` is `NaN`) will be rendered as an empty string. If the model is not set to the first of the month, the next view to model update will set it to the first of the month.

The timezone to be used to read/write the `Date` instance in the model can be defined using ngModelOptions. By default, this is the timezone of the browser.

## Directive Info

- This directive executes at priority level 0.

## Usage

    <input type="month"
           ng-model="string"
           [name="string"]
           [min="string"]
           [max="string"]
           [required="string"]
           [ng-required="string"]
           [ng-change="string"]>

### Arguments

Param | Type | Details
--- | --- | ---
ngModel | string | Assignable angular expression to data-bind to.
name (optional) | string | Property name of the form under which the control is published.
min (optional) | string | Sets the `min` validation error key if the value entered is less than `min`. This must be a valid ISO month format (yyyy-MM).
max (optional) | string | Sets the `max` validation error key if the value entered is greater than `max`. This must be a valid ISO month format (yyyy-MM).
required (optional) | string | Sets `required` validation error key if the value is not entered.
ngRequired (optional) | string | Adds `required` attribute and `required` validation constraint to the element when the ngRequired expression evaluates to true. Use `ngRequired` instead of `required` when you want to data-bind to the `required` attribute.
ngChange (optional) | string | Angular expression to be executed when input changes due to user interaction with the input element.

## Example

Edit in Plunker

    <script>
     angular.module('monthExample', [])
       .controller('DateController', ['$scope', function($scope) {
         $scope.example = {
           value: new Date(2013, 9, 1)
         };
       }]);
    </script>
    <form name="myForm" ng-controller="DateController as dateCtrl">
      <label for="exampleInput">Pick a month in 2013:</label>
      <input id="exampleInput" type="month" name="input" ng-model="example.value"
         placeholder="yyyy-MM" min="2013-01" max="2013-12" required />
      <div role="alert">
        <span class="error" ng-show="myForm.input.$error.required">
           Required!</span>
        <span class="error" ng-show="myForm.input.$error.month">
           Not a valid month!</span>
      </div>
      <tt>value = {{example.value | date: "yyyy-MM"}}</tt><br/>
      <tt>myForm.input.$valid = {{myForm.input.$valid}}</tt><br/>
      <tt>myForm.input.$error = {{myForm.input.$error}}</tt><br/>
      <tt>myForm.$valid = {{myForm.$valid}}</tt><br/>
      <tt>myForm.$error.required = {{!!myForm.$error.required}}</tt><br/>
    </form>

    var value = element(by.binding('example.value | date: "yyyy-MM"'));
    var valid = element(by.binding('myForm.input.$valid'));
    var input = element(by.model('example.value'));

    // currently protractor/webdriver does not support
    // sending keys to all known HTML5 input controls
    // for various browsers (https://github.com/angular/protractor/issues/562).
    function setInput(val) {
      // set the value of the element and force validation.
      var scr = "var ipt = document.getElementById('exampleInput'); " +
      "ipt.value = '" + val + "';" +
      "angular.element(ipt).scope().$apply(function(s) { s.myForm[ipt.name].$setViewValue('" + val + "'); });";
      browser.executeScript(scr);
    }

    it('should initialize to model', function() {
      expect(value.getText()).toContain('2013-10');
      expect(valid.getText()).toContain('myForm.input.$valid = true');
    });

    it('should be invalid if empty', function() {
      setInput('');
      expect(value.getText()).toEqual('value =');
      expect(valid.getText()).toContain('myForm.input.$valid = false');
    });

    it('should be invalid if over max', function() {
      setInput('2015-01');
      expect(value.getText()).toContain('');
      expect(valid.getText()).toContain('myForm.input.$valid = false');
    });