AngularJS：使用element.bind（'input'）在自定义指令中访问事件 [英] AngularJS: Access event inside custom directive using element.bind('input')

问题描述

我必须编写自定义指令，因为在编写韩文字符时我需要访问用户输入。如另一篇文章，我不能使用keydown或keypress，因为在编写韩文字符时它们不会在正确的时间被触发。 element.bind（'input'）可以解决问题，但现在我遇到了另一个问题。

I had to write a custom directive because I need access to user input while composing Korean characters. As explained in another post, I can't use keydown or keypress because they don't get triggered at the right time when composing Korean characters. element.bind('input') does the trick but now I face another problem.

如何在element.bind回调中访问事件以退出/返回if输入键已被击中？

How can I access the event inside the element.bind callback to exit/return if the enter key has been hit?

HTML

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

指令

.directive('cstInput', function() {
  return {
    restrict: 'A',
    require: '^ngModel',    
    link: function (scope, element, attrs, ngModel) {
      element.bind('input', function(event) {                  
        if (event.which === 13) { return; } // can't access the event unless I bind to keypress etc
        scope.$apply(function(){            
          scope.ngModel = element.val();
          scope.$eval(attrs.cstInput, {'answer': scope.ngModel});
        });
      });
    }
  };
})

推荐答案

请注意;

输入：没有哪个属性并在按下后触发。即你可以在keypress事件中绑定unbind input 事件。 Enter也不会触发输入事件。即e.which == 13不需要验证。

input: don't have which property and triggered after keypress. Namely you can bind unbind input event inside keypress event. Also input event don't triggered on Enter. Namely e.which==13 not requred to validate.

keypress 事件在退格时未触发，如果您不需要检查值时退格，没有问题。

keypress event not triggered when backspace, if you don't need check value when backspace, there is no problem.

keydown 和 keyup 事件触发每个键，您可以将它们与其他
一起使用您可以尝试类似这样的事情。

keydown and keyup events triggered for each key you can use them with eachother You can try something like this.

.directive('cstInput', function() {
  return {
   restrict: 'A',
   require: '^ngModel',    
   link: function (scope, element, attrs, ngModel) {
       element.on('keypress', function(event) {                  
              if (event.which === 13) { return; } // check key how you want
               //attach input event 
               element.on('input', function(evt) { 
                   scope.$apply(function(){            
                       scope.ngModel = element.val();
                       scope.$eval(attrs.cstInput, {'answer': scope.ngModel});
                   });
                   //deatach event again
                   element.off('input')
              });
       });

      //Alternatively using keydown with same way
      element.on('keydown', function(event) {                  
              if (event.which === 13) { return; } // check key how you want
               //attach input event 
               element.on('input', function(evt) { 
                   scope.$apply(function(){            
                       scope.ngModel = element.val();
                       scope.$eval(attrs.cstInput, {'answer': scope.ngModel});
                   });
                   //deatach event again
                   element.off('input')
              });
       });

   }
 };
})

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