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我正在使用自定义角度表单验证来验证基于具有值的字段和下拉列表的选定值的字段。我在页面上使用了相同的代码部分（因此也使用了相同的指令）两次。所以我可以重复使用，我尝试向指令发送一个参数。这一切都很好。但是，当创建子范围时，它会将我的 2 向绑定中断回fruit.cost.

这是一个示例小提琴。

我究竟做错了什么？我希望所有验证都能正常工作，但也保留 2 向绑定。这是我的小提琴代码的副本：

JS

function MainCtrl($scope){
  $scope.localFruits = [
      {name: 'banana'},
      {name: 'orange'},
      {name: 'grape'}
  ];
  $scope.fruits = [
      {name: 'banana'},
      {name: 'orange'},
      {name: 'grape'}
  ];
  $scope.costRequired = [
      'local',
      'overseas'
  ];
  $scope.selectedCostRequired = '';
}

angular.module('test', []).directive('customRequired', function() {
  return {
      restrict: 'A',
      require: 'ngModel',
      scope: {
          requiredWhenKey: '=',
          cost: '=' // I think the problem is here?? Can't figure out how to pass the property I want to bind to
      },
      link: function(scope, elem, attrs, ctrl) {
          //console.log(scope);
          function isValid(value) {
              if (scope.$parent.selectedCostRequired === scope.requiredWhenKey) {
                  return !!value;
              }
              return true;
          }

          ctrl.$parsers.unshift(function(value) {
              var valid = isValid(value);
              scope.$parent.subForm.cost.$setValidity('customRequired', valid);
              return valid ? value : undefined;
          });

          ctrl.$formatters.unshift(function(value) {
              scope.$parent.subForm.cost.$setValidity('customRequired', isValid(value));
              return value;
          });

          scope.$watch('$parent.$parent.selectedCostRequired', function() {
              scope.$parent.subForm.cost.$setValidity('customRequired', isValid(ctrl.$modelValue));
          });
      }
  };
});

HTML

<div ng-app="test" ng-controller="MainCtrl">
<form name="form">
    Which grouping is required? <select name="costRequired" ng-model="selectedCostRequired" ng-options="t for t in costRequired"></select>
    <h2>Local</h2>
    <div ng-repeat="fruit in localFruits" ng-form="subForm">
        {{fruit.name}}: <input name="cost" ng-model="fruit.cost" required-when-key="'local'" custom-required/> bound value is: [{{fruit.cost}}]
        <span class="error" ng-show="subForm.cost.$error.customRequired">Required</span>
    </div>
    <h2>Overseas</h2>
    <div ng-repeat="fruit in fruits" ng-form="subForm">
        {{fruit.name}}: <input name="cost" ng-model="fruit.cost" required-when-key="'overseas'" custom-required/> bound value is: [{{fruit.cost}}]
        <span class="error" ng-show="subForm.cost.$error.customRequired">Required</span>
    </div>
    <div ng-show="form.$invalid" class="error">some form error(s) still exist</div>
    <div ng-show="!form.$invalid" class="okay">form looks good!</div>
</form>
</div>
4

1 回答 1

2

使用ng-model在同一元素上创建隔离范围的指令不起作用。

我建议要么不创建新范围，要么使用scope: true.

这是一个不创建新范围的简化示例：

<form name="form">
    <div ng-repeat="fruit in localFruits">
        {{fruit.name}}: 
        <input ng-model="fruit.cost" required-when-key="local" custom-required/> 
        bound value is: [{{fruit.cost}}]
    </div>
</form>


function MyCtrl($scope) {
    $scope.localFruits = [
      {name: 'banana'},
  ];
}
app.directive('customRequired', function() {
  return {
      restrict: 'A',
      require: 'ngModel',
      link: function(scope, elem, attrs, ctrl) {
          console.log(attrs.requiredWhenKey);
      }
  };
});

fiddle

由于required-when-key属性只是一个字符串，因此您可以使用attrs.requiredWhenKey.

如果您不创建新范围，您还应该能够删除$parent指令中的大部分查找。

于 2013-05-18T04:04:05.253 回答