Javascript 角度自定义验证器导致范围变量未定义?
我正在为检查数组长度的指令实现一个自定义验证器,但当我尝试取消注释验证器中的一行代码时,我遇到了一个有趣的问题:Javascript 角度自定义验证器导致范围变量未定义?,javascript,angularjs,validation,Javascript,Angularjs,Validation,我正在为检查数组长度的指令实现一个自定义验证器,但当我尝试取消注释验证器中的一行代码时,我遇到了一个有趣的问题: angular.module("directives.tags", []).directive("tags", ["Tag", "$timeout", function(Tag, $timeout) { return { require: 'ngModel', restrict: 'E', scope: {
angular.module("directives.tags", []).directive("tags", ["Tag", "$timeout", function(Tag, $timeout) {
return {
require: 'ngModel',
restrict: 'E',
scope: {
availableTags: '=',
currentTags: '=ngModel'
},
link: function($scope, element, attributes, ctrl) {
// Snip
$scope.updateSuggestionList = function() {
var search = new RegExp($scope.tagInput, "i");
$scope.suggestions = $scope.availableTags.filter(function(availableTag) {
if ($scope.currentTags.filter(function(currentTag) {
return availableTag.name == currentTag.name;
}).length == 0) {
return search.test(availableTag.name);
}
return false;
}).slice(0,6);
};
// PROBLEM APPEARS TO BE HERE
ctrl.$validators.taglength = function(currentTags) {
return true; // <-- This works just fine
return currentTags.length > 0 && currentTags.length < 6; // <-- This does not work at all
};
$scope.$watch('currentTags', function() {
ctrl.$validate();
}, true);
},
templateUrl: // snip
}
}]);
解决了。在
$validate()
的文档中:
运行每个注册的验证器(首先是同步验证器,然后是异步验证器)。如果有效性更改为无效,则模型将设置为未定义,除非ngModelOptions.allowInvalid为true
所以我只需要设置
ngModelOptions.allowInvalid=true代码> 已解决。在$validate()
的文档中:
运行每个注册的验证器(首先是同步验证器,然后是异步验证器)。如果有效性更改为无效,则模型将设置为未定义,除非ngModelOptions.allowInvalid为true
所以我只需要设置ngModelOptions.allowInvalid=true代码> 您不需要将作用域绑定到ng model
属性(事实上,您不应该这样做),因为需要:“ngModel”
-要访问该值,请使用ctrl.$modelValue
(在第一个摘要周期中它可能是未定义的
)何时调用updateSuggestionList
以及如何更新currentTags
?在updateSuggestionList
中抛出错误。无法理解验证器是如何影响它的!请同时发布触发updateSuggestionList
functioPreethi的代码。我添加了指令模板。@NewDev,因此我尝试使用ctrl.$modelValue
,得到了相同的结果-它是空的,然后几乎是瞬间未定义的。您能告诉我为什么不将作用域绑定到ng model
?您不需要将作用域绑定到ng model
属性(事实上,您不应该这样做),因为需要:“ngModel”
-要访问该值,请使用ctrl.$modelValue
(在第一个摘要周期中它可能是未定义的
)何时调用updateSuggestionList
以及如何更新currentTags
?在updateSuggestionList
中抛出错误。无法理解验证器是如何影响它的!请同时发布触发updateSuggestionList
functioPreethi的代码。我添加了指令模板。@NewDev,因此我尝试使用ctrl.$modelValue
,得到了相同的结果-它是空的,然后几乎是瞬间未定义的。您能告诉我为什么不将作用域绑定到ng model
?
Error: $scope.currentTags is undefined
.link/$scope.updateSuggestionList/$scope.suggestions<@http://localhost:3000/js/app.js:1116:1
.link/$scope.updateSuggestionList@http://localhost:3000/js/app.js:1115:38
anonymous/fn@https://ajax.googleapis.com/ajax/libs/angularjs/1.4.4/angular.js line 13231 > Function:2:248
ngEventHandler/</callback@https://ajax.googleapis.com/ajax/libs/angularjs/1.4.4/angular.js:23411:17
$RootScopeProvider/this.$get</Scope.prototype.$eval@https://ajax.googleapis.com/ajax/libs/angularjs/1.4.4/angular.js:15916:16
$RootScopeProvider/this.$get</Scope.prototype.$apply@https://ajax.googleapis.com/ajax/libs/angularjs/1.4.4/angular.js:16016:20
ngEventHandler/<@https://ajax.googleapis.com/ajax/libs/angularjs/1.4.4/angular.js:23416:17
n.event.dispatch@https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js:3:6414
n.event.add/r.handle@https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js:3:3224
<div class="tagger-container">
<div class="wrapper" ng-class="{ 'active': areSuggestionsVisible }">
<div class="tag-wrapper">
<div class="tag" ng-repeat="tag in currentTags">
[[ tag.name ]]
<span class="remove" ng-click="removeTag(tag)"></span>
</div>
</div>
<input type="text" class="tag-input"
ng-model="tagInput"
ng-style="{ width: inputLength + 'px'}"
ng-keydown="tagInputKeydown($event)"
ng-keyup="updateSuggestionList()"
ng-focus="toggleSuggestionVisibility()"
ng-blur="toggleSuggestionVisibility()" />
</div>
<div class="suggestions" ng-show="areSuggestionsVisible">
<div class="suggestion" ng-repeat="tag in suggestions" ng-mousedown="createTag(tag.name)">[[ tag.name ]] </div>
</div>
</div>
<tags available-tags="data.tags" name="tags" ng-model="text.tags"></tags>
[{ name: 'aTag', description: null, id: 1}, ..., ...]