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Input with week-of-the-year validation and transformation to Date. In browsers that do not yet support the HTML5 week input, a text element will be used. In that case, the text must be entered in a valid ISO-8601 week format (yyyy-W##), for example: `2013-W02`.

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.

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="week"
           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 week format (yyyy-W##).
max (optional) | string | Sets the `max` validation error key if the value entered is greater than `max`. This must be a valid ISO week format (yyyy-W##).
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('weekExample', [])
      .controller('DateController', ['$scope', function($scope) {
        $scope.example = {
          value: new Date(2013, 0, 3)
        };
      }]);
    </script>
    <form name="myForm" ng-controller="DateController as dateCtrl">
      <label>Pick a date between in 2013:
        <input id="exampleInput" type="week" name="input" ng-model="example.value"
               placeholder="YYYY-W##" min="2012-W32"
               max="2013-W52" required />
      </label>
      <div role="alert">
        <span class="error" ng-show="myForm.input.$error.required">
            Required!</span>
        <span class="error" ng-show="myForm.input.$error.week">
            Not a valid date!</span>
      </div>
      <tt>value = {{example.value | date: "yyyy-Www"}}</tt><br/>
      <tt>myForm.input.$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-Www"'));
    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-W01');
      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-W01');
      expect(value.getText()).toContain('');
      expect(valid.getText()).toContain('myForm.input.$valid = false');
    });