angularjs – 如何使用单向绑定正确格式化指令中的数据?

我正在尝试使用自定义指令中的单向绑定进行一些数据操作,但我第一次收到“未定义”.我应该怎么做指令而不是使用$watch?

例:

<one val={{arr[1].value}}> </one>
<two val="arr[0].value"> </two>

指令:

 .directive('one', function(){
    return {
      restrict: 'E',
      scope: {
      val:'@'
      },
      template: '<div> 1111 {{val}} </div>' ,
      link: function (scope) {
      console.log('scope', scope.val) // SHOWS UNDEFINED BUT INSERT DATA IN TEMPLATE
      if(scope.val) scope.val =	scope.val.replace(/\d/g,'')
      
      
      }
    }
  })
    .directive('two', function(){
    return {
      restrict: 'E',
      scope: {
      val:'='
      },
      template: '<div> 2222 {{val}} </div>' ,
       link: function (scope) {
      console.log('scope', scope.val)
      scope.val = 	scope.val.replace(/\d/g,'')
      
      }
    }
  });

示例:JsFiddle

最佳答案 您只需要使用attr.$observe来从单向绑定访问值,将链接函数的代码更改为 –

link: function (scope,elum,attr) {
  attr.$observe('val', function(value) { console.log('scope', scope.val) })
  //console.log('scope', scope.val)
  if(scope.val) scope.val = scope.val.replace(/\d/g,'')


  }

查找更新JsFiddle

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