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AngularJS: API: ng/directive/ngModelOptions

ngModelOptions

  1. - directive in module ng

允许调整模型更新时机。使用 ngModelOptions 你可以指定一个触发模型更新和(或)消除抖动延迟事件列表,使实际更新只发生在计时器过期时。此计时器会被之后的其他变化重置。

鉴于ngModelOptions的性质, 在视图中显示的输入域的值可能不同于实际模型的值。这意味着如果你更新模型,你需要在新旧关的输入域上调用$rollbackViewValue,以确保它与模型同步,并会消除任何抖动。

引用控制的$rollbackViewValue方法的最简单的方法是确保输入组件被放置在一个具有name属性的表单中。这很重要,因为 form控制器使用它们的 name 属性发布到相关域。

任何挂起的更改会立即生效,当整个表单通过 submit事件提交时。注意 ngClick 事件会在模型更新前生效。使用 ngSubmit 来存取更新后的模型。

指令信息

  • 这个指令执行优先级为0.

用法

  • 作为属性使用:
    <ANY
      ng-model-options="">
    ...
    </ANY>

参数

参数 类型 详述
ngModelOptions Object

应用于当前模型的可选项。有效的键名为:

  • updateOn: 用于指定输入绑定到哪个事件的字符串。你可以设置使用空格分隔的事件列表。有一个特殊事件叫 default ,用于匹配控件自身的默认事件。
  • debounce: 以毫秒为单位的整型值,用于防止模型更新抖动。值为0会立即触发更新。如果使用一个对象替代的话,你可以为每个事件指定值。例如:ngModelOptions="{ updateOn: 'default blur', debounce: {'default': 500, 'blur': 0} }"
  • getterSetter: 布尔值,用于声明 ngModel是否绑定到getters/setters函数上。

示例

下面的例子演示如何替换立即更新。表单内的输入控件只会在失去焦点时才更新模型 (blur 事件)。如果当前焦点在输入字段时按了escape键,当前模型的值会被重置。

index.html
<div ng-controller="ExampleController">
  <form name="userForm">
    Name:
    <input Type="text" name="userName"
           ng-model="user.name"
           ng-model-options="{ updateOn: 'blur' }"
           ng-keyup="cancel($event)" /><br />

    Other data:
    <input Type="text" ng-model="user.data" /><br />
  </form>
  <pre>user.name = <span ng-bind="user.name"></span></pre>
</div>
app.js
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();
      }
    };
  }]);
protractor.js
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');});

下面的例子演示如何消除模型改变时的抖动。模型会在最后一次改变的1秒后更新。如果按了Clear按钮,任何消除抖动操作会被取消,值会清空。

index.html
<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.$rollbackViewValue(); user.name=''">Clear</button><br />
  </form>
  <pre>user.name = <span ng-bind="user.name"></span></pre>
</div>
app.js
angular.module('optionsExample', [])
  .controller('ExampleController', ['$scope', Function($scope) {
    $scope.user = { name: 'say' };
  }]);

下面的例子演示如何绑定到getter/setters:

index.html
<div ng-controller="ExampleController">
  <form name="userForm">
    Name:
    <input Type="text" name="userName"
           ng-model="user.name"
           ng-model-options="{ getterSetter: true }" />
  </form>
  <pre>user.name = <span ng-bind="user.name()"></span></pre>
</div>
app.js
angular.module('getterSetterExample', [])
  .controller('ExampleController', ['$scope', Function($scope) {
    var _name = 'Brian';
    $scope.user = {
      name: Function (newName) {
        return angular.isDefined(newName) ? (_name = newName) : _name;
      }
    };
  }]);
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