javascript - AngularJS:在编写韩文字符时触发 ng-change、ng-keyup 或 $scope.$watch

Question

我正在构建一个韩语词汇训练器，我想将用户输入与人们输入的内容进行比较。

在韩语和其他一些亚洲语言中，您可以通过多个按键事件来组合字母。在 Chrome 中，$scope.$watch、ng-keyup 和 ng-change 仅在字母完全组成并输入新字母或空格后才会触发。我不介意 AngularJS 在最后一个字母完全组成之前不会触发任何东西，但是一旦字母完成，它应该触发而不必添加空格或开始下一个单词。

HTML:

<form name="forms.vocabularyForm">
  <input name="answer" id="answer" ng-model="vocabularyCtrl.answer" ng-change="vocabularyCtrl.checkChange()" ng-keyup="vocabularyCtrl.checkKeyUp($event)" type="text" />
</form>

Controller :

.controller('VocabularyCtrl', [
  '$scope',
  '$location',
  function($scope, $location) {

    this.checkChange = function () {
      console.log("answer change: " + this.answer); 
    };

    this.checkKeyUp = function ($event) {
      console.log("answer keyUp: " + this.answer);
    };

    $scope.$watch('vocabularyCtrl.answer', function (answerNew, answerOld) {        
      console.log('answerOld: ' + answerOld + ', answerNew: ' + answerNew);         
    }, true);        

  };     
]);        

例子:

Input: ㄱ 
Console:
answerOld: , answerNew:
answer keyUp:

Input: 가
Console:
answerOld: , answerNew:    
answer keyUp:

Input: 감 (character is now fully composed)
Console:
answerOld: , answerNew:    
answer keyUp:

Input: 감ㅅ (starting the next character, same behaviour with space bar)
Console:
answerOld: 감, answerNew:
answer change: 감
answer keyUp: 감                  

Answer 1

正如 Angular 团队的一位乐于助人的成员所解释的那样，在组合 Angular 色时所有触发器都被有意抑制。更多详情 here .

按照建议，我创建了一个自定义指令，在编写字符时手动更新模型:

指令:

(function() {
  'use strict';

  angular.module('myApp', [])

  // Angular's ng-change, ng-keyup and $scope.$watch don't get triggered
  // while composing (e.g. when writing Korean syllables).
  // See: https://github.com/angular/angular.js/issues/10588  
  // This custom directive uses element.on('input') instead, which gets
  // triggered while composing.
  .directive('cstInput', function() {
    return {
      restrict: 'A',
      require: '^ngModel',
      scope: {
        ngModel: '=', // sync model
      },      
      link: function (scope, element, attrs, ngModel) {
        element.on('input', function() {          
          scope.ngModel = element.val();       
        });
      }
    };
  });  
})();

Controller :(按照 ippi 的建议)

$scope.$watch('quizzesCtrl.answer', function (answer) {
  console.log(answer);
});

HTML:

<form ng-controller="QuizzesController as quizzesCtrl">
  <input cst-input name="answer" id="answer" ng-model="quizzesCtrl.answer" type="text" />
</form>

更新

我必须将代码更改为以下代码才能使其在 FireFox 中工作(Chrome 和 Safari 可以很好地使用上面的代码)。

指令:

(function() {
  'use strict';

  angular.module('myApp', [])

  // Angular's ng-change, ng-keyup and $scope.$watch don't get triggered
  // while composing (e.g. when writing Korean syllables).
  // See: https://github.com/angular/angular.js/issues/10588  
  // This custom directive uses element.on('input') instead, which gets
  // triggered while composing.
  .directive('cstInput', function() {
    return {
      restrict: 'A',
      require: '^ngModel',    
      link: function (scope, element, attrs, ngModel) {
        element.on('input', function() {                  
          scope.$apply(function(){            
            scope.ngModel = element.val();
            scope.$eval(attrs.cstInput, {'answer': scope.ngModel}); // only works if no scope has been defined in directive
          });
        });
      }
    };
  });

})();

Controller :

this.checkAnswer = function (answer) {        
  if (answer === this.quiz.answer) {        
    this.isCorrect = true; 
  }
};

HTML(注意任何传入的参数都需要在 cst-input-callback 中列出):

<form ng-controller="QuizzesController as quizzesCtrl">
  <input cst-input="quizzesCtrl.checkAnswer(answer)" ng-model="quizzesCtrl.answer" name="answer" id="answer" type="text" />
</form>