AngularJS: Custom directive using dynamic attribute value doesn't work inside “ng-repeat”

前端未结

关注

 1  1516

余生分开走

Could you explain please why the following directive doesn\'t work?

attrs.ngMydirective seems to be undefined inside the linking function.

相关标签:

1条回答

闹比i

2021-02-02 13:25

You should use attrs.$observe to have actual value.

Another approach is to pass this value to directive's scope and $watch it.

Both approaches are shown here (live example):

var app = angular.module('myApp', []);

app.directive('ngMydirective', function() {
  return {
    replace: true,
    link: function(scope, element, attrs) {
      attrs.$observe('ngMydirective', function(value) {
        if (parseInt(value, 10) < 18) {
          element.html('child'); 
        }
      });
    }
  };
});
app.directive('ngMydirective2', function() {
  return {
    replace: true,
    scope: { ngMydirective2: '@' },
    link: function(scope, element, attrs) {
      scope.$watch('ngMydirective2', function(value) {
        console.log(value);
        if (parseInt(value, 10) < 18) {
          element.html('child'); 
        }
      });
    }
  };
});

app.controller('MyCtrl', function($scope) {
  $scope.people = [
    {name: 'John', age: 33},
    {name: 'Michelle', age: 5}
  ];
});

<body ng-controller="MyCtrl">

  <ul>
    <li ng-repeat="person in people">
      {{ person.name }}
      <span ng-mydirective="{{ person.age }}"></span>  
    </li>
    <li ng-repeat="person in people">
      {{ person.name }}
      <span ng-mydirective2="{{ person.age }}"></span>  
    </li>
  </ul>

</body>

0 讨论(0)