使用ng-if時，角度避免代碼重復

Question

我當前的實現：

<div class="outer-class" ng-repeat="item in items">
  <div class="inner-class" ng-if="isShow">
    <div class="inner-class-1">{{item}}</div>
  </div>
  <div ng-if="!isShow" class="inner-class-1">{{item}}</div>
</div>

上面的代碼有效，但是有很多代碼重復：

1. ng-if是否存在兩次（無法使用ng-switch因為在兩者之間引入了新元素）
2. <div ng-if="!isShow" class="inner-class-1">{{item}}</div>重復了兩次，只是因為我不想使用該元素（ <div class="inner-class"></div> ），以在ng-if評估為false時封裝我的數據。

我想知道是否有更好的方法可以重寫相同的內容。

Answer 1

也許是這樣的嗎？

 //optional wrapper function resolveTemplate(tElement, tAttrs) { if (tAttrs.showWrapper){ return "<div ng-class='wrapperClass' ng-transclude></div>" } else return "<ng-transclude></ng-transclude>"; } app.directive('optionalWrapper', function() { return { restrict: 'E', transclude: true, template: resolveTemplate, link: function($scope, el, attrs) { $scope.wrapperClass = attrs.wrapperClass; } }; }); 

要這樣使用：

 <optional-wrapper wrapper-class='inner-class-1' show-wrapper='isShow'></optional-wrapper> 

Answer 2

在這種情況下，最好創建一個可以有條件包裝內容的自定義指令。 您可以執行以下操作：

 angular.module('demo', []).controller('DemoController', function($scope) { $scope.items = [1, 2, 3]; $scope.isShow = false; }) .directive('wrapIf', function() { return { restrict: 'A', transclude: true, link: function(scope, element, attrs, controller, transclude) { var previousContent; scope.$watch(attrs.wrapIf, function(newVal) { if (newVal) { previousContent.parent().append(element); element.empty().append(previousContent); } else { transclude(function(clone, scope) { previousContent = clone; element.replaceWith(clone); }); } }) } }; }); 

 .inner-class, .inner-class-1 { padding: 6px; background: #DDD; } .inner-class-1 { background: #34dac3; } .outer-class { margin-bottom: 6px; } 

 <script src="https://code.angularjs.org/1.4.8/angular.js"></script> <div ng-app="demo" ng-controller="DemoController"> <p> <button ng-click="isShow = !isShow">Toggle isShow ({{ isShow }})</button> </p> <div class="outer-class" ng-repeat="item in items"> <div class="inner-class" wrap-if="isShow"> <div class="inner-class-1" ng-click="test(item)">{{item}}</div> </div> </div> </div>