@ngdoc overview
@name Cookbook: Form
@description

A web application's main purpose is to present and gather data. For this reason angular strives
to make both of these operations trivial. This example shows off how you can build a simple form to
allow a user to enter data.


<doc:example>
 <doc:source>
  <script>
    function FormController($scope) {
      $scope.user = {
        name: 'John Smith',
        address:{line1: '123 Main St.', city:'Anytown', state:'AA', zip:'12345'},
        contacts:[{type:'phone', value:'1(234) 555-1212'}]
      };
      $scope.state = /^\w\w$/;
      $scope.zip = /^\d\d\d\d\d$/;

      $scope.addContact = function() {
         $scope.user.contacts.push({type:'', value:''});
      };

      $scope.removeContact = function(contact) {
        for (var i = 0, ii = this.user.contacts.length; i < ii; i++) {
          if (contact === this.user.contacts[i]) {
            $scope.user.contacts.splice(i, 1);
          }
        }
      };
    }
  </script>
  <div ng:controller="FormController" class="example">

    <label>Name:</label><br/>
    <input type="text" ng:model="user.name" required/> <br/><br/>

    <label>Address:</label><br/>
    <input type="text" ng:model="user.address.line1" size="33" required> <br/>
    <input type="text" ng:model="user.address.city" size="12" required>,
    <input type="text" ng:model="user.address.state" size="2"
           ng:pattern="state" required>
    <input type="text" ng:model="user.address.zip" size="5"
           ng:pattern="zip"  required><br/><br/>

    <label>Phone:</label>
    [ <a href="" ng:click="addContact()">add</a> ]
    <div ng:repeat="contact in user.contacts">
      <select ng:model="contact.type">
        <option>email</option>
        <option>phone</option>
        <option>pager</option>
        <option>IM</option>
      </select>
      <input type="text" ng:model="contact.value" required/>
       [ <a href="" ng:click="removeContact(contact)">X</a> ]
    </div>
    <hr/>
    Debug View:
    <pre>user={{user}}</pre>
  </div>

 </doc:source>
 <doc:scenario>
  it('should show debug', function() {
    expect(binding('user')).toMatch(/John Smith/);
  });
  it('should add contact', function() {
    using('.example').element('a:contains(add)').click();
    using('.example div:last').input('contact.value').enter('you@example.org');
    expect(binding('user')).toMatch(/\(234\) 555\-1212/);
    expect(binding('user')).toMatch(/you@example.org/);
  });

  it('should remove contact', function() {
    using('.example').element('a:contains(X)').click();
    expect(binding('user')).not().toMatch(/\(234\) 555\-1212/);
  });

  it('should validate zip', function() {
    expect(using('.example').
      element(':input[ng\\:model="user.address.zip"]').
      prop('className')).not().toMatch(/ng-invalid/);
    using('.example').input('user.address.zip').enter('abc');
    expect(using('.example').
      element(':input[ng\\:model="user.address.zip"]').
      prop('className')).toMatch(/ng-invalid/);
  });

  it('should validate state', function() {
    expect(using('.example').element(':input[ng\\:model="user.address.state"]').prop('className'))
      .not().toMatch(/ng-invalid/);
    using('.example').input('user.address.state').enter('XXX');
    expect(using('.example').element(':input[ng\\:model="user.address.state"]').prop('className'))
      .toMatch(/ng-invalid/);
  });
 </doc:scenario>
</doc:example>


# Things to notice

* The user data model is initialized {@link api/angular.module.ng.$compileProvider.directive.ng:controller controller} and is
  available in the {@link api/angular.module.ng.$rootScope.Scope scope} with the initial data.
* For debugging purposes we have included a debug view of the model to better understand what
  is going on.
* The {@link api/angular.module.ng.$compileProvider.directive.input input directives} simply refer
  to the model and are data-bound.
* The inputs {@link guide/dev_guide.forms validate}. (Try leaving them blank or entering non digits
  in the zip field)
* In your application you can simply read from or write to the model and the form will be updated.
* By clicking the 'add' link you are adding new items into the `user.contacts` array which are then
  reflected in the view.
