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## Overview

This directive allows you to modify the behaviour of `ngModel` directives within your application. You can specify an `ngModelOptions` directive on any element. All `ngModel` directives will use the options of their nearest `ngModelOptions` ancestor.

The `ngModelOptions` settings are found by evaluating the value of the attribute directive as an AngularJS expression. This expression should evaluate to an object, whose properties contain the settings. For example: `<div ng-model-options="{ debounce: 100 }"`.

## Inheriting Options

You can specify that an `ngModelOptions` setting should be inherited from a parent `ngModelOptions` directive by giving it the value of `"$inherit"`. Then it will inherit that setting from the first `ngModelOptions` directive found by traversing up the DOM tree. If there is no ancestor element containing an `ngModelOptions` directive then default settings will be used.

For example given the following fragment of HTML

    <div ng-model-options="{ allowInvalid: true, debounce: 200 }">
      <form ng-model-options="{ updateOn: 'blur', allowInvalid: '$inherit' }">
        <input ng-model-options="{ updateOn: 'default', allowInvalid: '$inherit' }" />
      </form>
    </div>

the `input` element will have the following settings

    { allowInvalid: true, updateOn: 'default', debounce: 0 }

Notice that the `debounce` setting was not inherited and used the default value instead.

You can specify that all undefined settings are automatically inherited from an ancestor by including a property with key of `"*"` and value of `"$inherit"`.

For example given the following fragment of HTML

    <div ng-model-options="{ allowInvalid: true, debounce: 200 }">
      <form ng-model-options="{ updateOn: 'blur', "*": '$inherit' }">
        <input ng-model-options="{ updateOn: 'default', "*": '$inherit' }" />
      </form>
    </div>

the `input` element will have the following settings

    { allowInvalid: true, updateOn: 'default', debounce: 200 }

Notice that the `debounce` setting now inherits the value from the outer `<div>` element.

If you are creating a reusable component then you should be careful when using `"*": "$inherit"` since you may inadvertently inherit a setting in the future that changes the behavior of your component.

## Triggering and debouncing model updates

The `updateOn` and `debounce` properties allow you to specify a custom list of events that will trigger a model update and/or a debouncing delay so that the actual update only takes place when a timer expires; this timer will be reset after another change takes place.

Given the nature of `ngModelOptions`, the value displayed inside input fields in the view might be different from the value in the actual model. This means that if you update the model you should also invoke `ngModel.NgModelController` on the relevant input field in order to make sure it is synchronized with the model and that any debounced action is canceled.

The easiest way to reference the control's `ngModel.NgModelController` method is by making sure the input is placed inside a form that has a `name` attribute. This is important because `form` controllers are published to the related scope under the name in their `name` attribute.

Any pending changes will take place immediately when an enclosing form is submitted via the `submit` event. Note that `ngClick` events will occur before the model is updated. Use `ngSubmit` to have access to the updated model.

### Overriding immediate updates

The following example shows how to override immediate updates. Changes on the inputs within the form will update the model only when the control loses focus (blur event). If `escape` key is pressed while the input field is focused, the value is reset to the value in the current model.

    <div ng-controller="ExampleController">
      <form name="userForm">
        <label>
          Name:
          <input type="text" name="userName"
                 ng-model="user.name"
                 ng-model-options="{ updateOn: 'blur' }"
                 ng-keyup="cancel($event)" />
        </label><br />
        <label>
          Other data:
          <input type="text" ng-model="user.data" />
        </label><br />
      </form>
      <pre>user.name = <span ng-bind="user.name"></span></pre>
    </div>

    angular.module('optionsExample', [])
    .controller('ExampleController', ['$scope', function($scope) {
      $scope.user = { name: 'say', data: '' };

      $scope.cancel = function(e) {
        if (e.keyCode === 27) {
          $scope.userForm.userName.$rollbackViewValue();
        }
      };
    }]);

    var model = element(by.binding('user.name'));
    var input = element(by.model('user.name'));
    var other = element(by.model('user.data'));

    it('should allow custom events', function() {
      input.sendKeys(' hello');
      input.click();
      expect(model.getText()).toEqual('say');
      other.click();
      expect(model.getText()).toEqual('say hello');
    });

    it('should $rollbackViewValue when model changes', function() {
      input.sendKeys(' hello');
      expect(input.getAttribute('value')).toEqual('say hello');
      input.sendKeys(protractor.Key.ESCAPE);
      expect(input.getAttribute('value')).toEqual('say');
      other.click();
      expect(model.getText()).toEqual('say');
    });

### Debouncing updates

The next example shows how to debounce model changes. Model will be updated only 1 sec after last change. If the `Clear` button is pressed, any debounced action is canceled and the value becomes empty.

    <div ng-controller="ExampleController">
      <form name="userForm">
        Name:
        <input type="text" name="userName"
               ng-model="user.name"
               ng-model-options="{ debounce: 1000 }" />
        <button ng-click="userForm.userName.$rollbackViewValue(); user.name=''">Clear</button><br />
      </form>
      <pre>user.name = <span ng-bind="user.name"></span></pre>
    </div>

    angular.module('optionsExample', [])
    .controller('ExampleController', ['$scope', function($scope) {
      $scope.user = { name: 'say' };
    }]);

## Model updates and validation

The default behaviour in `ngModel` is that the model value is set to `undefined` when the validation determines that the value is invalid. By setting the `allowInvalid` property to true, the model will still be updated even if the value is invalid.

## Connecting to the scope

By setting the `getterSetter` property to true you are telling ngModel that the `ngModel` expression on the scope refers to a "getter/setter" function rather than the value itself.

The following example shows how to bind to getter/setters:

    <div ng-controller="ExampleController">
      <form name="userForm">
        <label>
          Name:
          <input type="text" name="userName"
                 ng-model="user.name"
                 ng-model-options="{ getterSetter: true }" />
        </label>
      </form>
      <pre>user.name = <span ng-bind="user.name()"></span></pre>
    </div>

    angular.module('getterSetterExample', [])
    .controller('ExampleController', ['$scope', function($scope) {
      var _name = 'Brian';
      $scope.user = {
        name: function(newName) {
          return angular.isDefined(newName) ? (_name = newName) : _name;
        }
      };
    }]);

## Specifying timezones

You can specify the timezone that date/time input directives expect by providing its name in the `timezone` property.

## Programmatically changing options

The `ngModelOptions` expression is only evaluated once when the directive is linked; it is not watched for changes. However, it is possible to override the options on a single `ngModel.NgModelController` instance with `NgModelController#$overrideModelOptions()`.

## Directive Info

- This directive executes at priority level 10.

## Usage

- as attribute:

      <ANY
        ng-model-options="Object">
      ...
      </ANY>

### Arguments

Param | Type | Details
--- | --- | ---
- ngModelOptions | Object | options to apply to `ngModel` directives on this element and and its descendents. Valid keys are: `updateOn`: string specifying which event should the input be bound to. You can set several events using an space delimited list. There is a special event called `default` that matches the default events belonging to the control. These are the events that are bound to the control, and when fired, update the `$viewValue` via `$setViewValue`. `ngModelOptions` considers every event that is not listed in `updateOn` a "default" event, since different control types use different default events. See also the section Triggering and debouncing model updates. `debounce`: integer value which contains the debounce model update value in milliseconds. A value of 0 triggers an immediate update. If an object is supplied instead, you can specify a custom value for each event. For example:
      ng-model-options="{
        updateOn: 'default blur click',
        debounce: { 'default': 500, 'blur': 0 }
      }"
"default" also applies to all events that are listed in `updateOn` but are not listed in `debounce`, i.e. "click" would also be debounced by 500 milliseconds. `allowInvalid`: boolean value which indicates that the model can be set with values that did not validate correctly instead of the default behavior of setting the model to undefined. `getterSetter`: boolean value which determines whether or not to treat functions bound to `ngModel` as getters/setters. `timezone`: Defines the timezone to be used to read/write the `Date` instance in the model for `<input type="date" />`, `<input type="time" />`, ... . It understands UTC/GMT and the continental US time zone abbreviations, but for general use, use a time zone offset, for example, `'+0430'` (4 hours, 30 minutes east of the Greenwich meridian) If not specified, the timezone of the browser will be used.