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AngularJS: API: ng/directive/ngChange

ngChange

- directive in module ng

当用户改变输入时计算给出的表达式。表达式会被立即计算，不像 JavaScript的onchange事件只会在最后一次改变时触发(通常，当用户离开表单元素或按回车键时)。当值的变化来自于模型时，不会对表达式进行计算。

注意，这个指令需要同时给出 ngModel 。

指令信息

这个指令执行优先级为0.

用法

作为属性使用:
```
<input
  ng-change="">
...
</input>
```

参数

参数	类型	详述
ngChange	expression	在输入值改变时执行的表达式。

示例

index.html

<script>
  angular.module('changeExample', [])
    .controller('ExampleController', ['$scope', Function($scope) {
      $scope.counter = 0;
      $scope.change = Function() {
        $scope.counter++;
      };
    }]);
</script>
<div ng-controller="ExampleController">
  <input Type="checkbox" ng-model="confirmed" ng-change="change()" id="ng-change-example1" />
  <input Type="checkbox" ng-model="confirmed" id="ng-change-example2" />
  <label for="ng-change-example2">Confirmed</label><br />
  <tt>debug = {{confirmed}}</tt><br/>
  <tt>counter = {{counter}}</tt><br/>
</div>

protractor.js

var counter = element(by.binding('counter'));
var debug = element(by.binding('confirmed'));

it('should evaluate the expression if changing from view', Function() {
  expect(counter.getText()).toContain('0');

  element(by.id('ng-change-example1')).click();

  expect(counter.getText()).toContain('1');
  expect(debug.getText()).toContain('true');});

it('should not evaluate the expression if changing from model', Function() {
  element(by.id('ng-change-example2')).click();

  expect(counter.getText()).toContain('0');
  expect(debug.getText()).toContain('true');});

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