Angularjs setValidity导致modelValue不更新

Question

我在使用表单时遇到了一些基本问题.这就是我做的.

我从这里抓住了这个很酷的指令:https://github.com/TheSharpieOne/angular-input-match

它看起来像这样:

directive('match', function () {
    return {
      require: 'ngModel',
      restrict: 'A',
      scope: {
        match: '='
      },
      link: function(scope, elem, attrs, ngModel) {
        scope.$watch(function() {
          return (ngModel.$pristine && angular.isUndefined(ngModel.$modelValue)) || scope.match === ngModel.$viewValue;
        }, function(currentValue, previousValue) {
          ngModel.$setValidity('match', currentValue);
        });
      }
    };
  });

本质上,该指令监视它附加到模型值的元素,并将其与match属性中的模型值进行比较.

所以...例如,下面我们正在观察两个密码是否匹配:

Password: <input ng-model="password" type="password" />
Confirm: <input ng-model="passwordConfirm" type="password" match="password" />

该指令似乎正在起作用,因为它适当地设置了ng-valid-match和ng-invalid-match.

但是,一旦将其设置为无效,passwordConfirm模型将永远不会再次更新.我已经完成了大量的console.loggin,在指令中查看ngModel,这是两个密码匹配时的样子:

Constructor {$viewValue: "asdf", $modelValue: undefined, $validators: Object, $parsers: Array[0], $formatters: Array[0]…}
$$debounceViewValueCommit: function (trigger, revalidate) {
$$invalidModelValue: "asdf"
$$lastCommittedViewValue: "asdf"
$$runValidators: function (modelValue, viewValue) {
$$validityState: ValidityState
$$writeModelToScope: function () {
$commitViewValue: function (revalidate) {
$dirty: true
$error: Object
$formatters: Array[0]
$invalid: false
$isEmpty: function (value) {
$modelValue: undefined
$name: "passwordConfirmation"
$parsers: Array[0]
$pristine: false
$render: function () {
$rollbackViewValue: function () {
$setPristine: function () {
$setTouched: function () {
$setUntouched: function () {
$setValidity: function (validationErrorKey, isValid) {
$setViewValue: function (value, trigger, revalidate) {
$touched: true
$untouched: false
$valid: true
$validate: function () {
$validators: Object
$viewChangeListeners: Array[0]
$viewValue: "asdf"
__proto__: Object

请注意$ viewValue是正确的,但$ modelValue列为undefined,$ invalidModelValue仍然有值.

这两个密码匹配时,这就是html的样子:

<input type="password" class="form-control ng-isolate-scope ng-dirty ng-valid-required ng-valid ng-valid-match ng-touched" id="passwordConfirmation" name="passwordConfirmation" placeholder="Confirm your password" ng-model="passwordConfirmation" required="" match="password" style="">

我在某处遗漏了什么吗？我已经圈了几个小时.

Answer 1

在最近的更新中,$modelValue根据字段的有效性对填充方式进行了更改.如果该字段无效,$modelValue则将设置为,undefined并且$$invalidModelValue将使用该值填充新属性.

作为使用1.2.*和1.3.*的解决方案,我想出了这个:

 .directive('match', function () {
    return {
        require: 'ngModel',
        restrict: 'A',
        scope: {
            match: '='
        },
        link: function(scope, elem, attrs, ctrl) {
            scope.$watch(function() {
                modelValue = ctrl.$modelValue || ctrl.$$invalidModelValue;
                return (ctrl.$pristine && angular.isUndefined(modelValue)) || scope.match === modelValue;
            }, function(currentValue) {
                ctrl.$setValidity('match', currentValue);
            });
        }
    };
});

Plunkr

虽然此解决方案适用于两个版本,但1.3.*具有$validators推荐用于新版本的新管道.

Answer 2

看来使用 $setValidity 可能不是这里的方法。我发现这个问题提出了一个不同的解决方案，使用 $validators 和 $validate()，这对我来说非常有用。新代码如下所示：

directive('match', function () {
  return {
    require: 'ngModel',
    restrict: 'A',
    scope: {
      match: '='
    },
    link: function(scope, elem, attrs, ngModel) {
      scope.$watch('match', function(pass){
        ngModel.$validate();
      });
      ngModel.$validators.match = function(modelValue, viewValue){
        var value = modelValue || viewValue;
        var match = scope.match;
        return value === match;
      };
    }
  };
});