AngularJS:在编写韩文字符时触发ng-change,ng-keyup或$ scope。$ watch

时间:2014-12-26 23:55:35

标签: javascript angularjs

我正在建立一名韩语词汇训练师,我希望将用户输入与人们输入进行比较。

在韩语和其他一些亚洲语言中,您使用多个键盘事件撰写字母。在Chrome中,$ scope。$ watch,ng-keyup和ng-change仅在字母完全合成并且输入了新字母或空格后触发。我不介意AngularJS在最后一个字母完全合成之前没有触发任何东西,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字。

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>

控制器:

.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);        

  };     
]);        

示例:

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                  

3 个答案:

答案 0 :(得分:4)

正如Angular团队的一位乐于助人的成员所解释的那样,在编写角色时会故意抑制所有触发器。更多详情here

根据建议,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();       
        });
      }
    };
  });  
})();

控制器:(由ippi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>

<强>更新

我必须将代码更改为以下代码才能使其在FireFox中正常工作(Chrome和Safari可以正常使用上面的代码)。

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
          });
        });
      }
    };
  });

})();

控制器:

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

HTML(请注意,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>

答案 1 :(得分:3)

我在Angular.js 1.2.27中发现了这个错误,我尝试了其他版本,但我没有遇到任何问题。但我找到了解决方案,这将解决您的问题。

看看这个解决方案 https://github.com/mbenford/ngTagsInput/issues/303

angular.module('angularApp')
.directive('ignoreCompositionEvent', function () {
    return {
        restrict: 'A',
        link: function postLink(scope, element) {
            //element.val('this is the ignoreCompositionEvent directive');
            element.off('compositionstart').off('compositionend');
        }
    };
});

这是example。只需打开您的控制台并在输入中键入한<。

答案 2 :(得分:1)

使用$watch,您将能够捕获模型的所有更新:

工作示例(jsfiddle):

HTML:

<div ng-app ng-controller="myctrl">
    <input type="text" ng-model="answer" />
</div>

JS:

function myctrl($scope) {
    $scope.$watch('answer',function(oldVal,newVal){
        console.log(oldVal,newVal);
    });
}

供参考,看起来可以使用ng-model-options并将compositionupdate - 事件分配给updateOn。我没有运气,而是使用$ watch。