Question

这是显示问题的小提琴。 http://jsfiddle.net/Erk4V/1/

如果我在ng-if中有一个ng-model，那么该模型似乎无法正常工作。

我想知道这是一个错误还是我误解了正确的用法。

<div ng-app >
    <div ng-controller="main">

        Test A: {{testa}}<br />
        Test B: {{testb}}<br />
        Test C: {{testc}}<br />

        <div>
            testa (without ng-if): <input type="checkbox" ng-model="testa" />
        </div>
        <div ng-if="!testa">
            testb (with ng-if): <input type="checkbox" ng-model="testb" />
        </div>
        <div ng-if="!someothervar">
            testc (with ng-if): <input type="checkbox" ng-model="testc" />
        </div>

    </div>
</div>

Answer 1

ng-if指令与其他指令一样，创建子范围。请参阅下面的脚本（或this jsfiddle）

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.0rc1/angular.min.js"></script>

<script>
    function main($scope) {
        $scope.testa = false;
        $scope.testb = false;
        $scope.testc = false;
        $scope.obj = {test: false};
    }
</script>

<div ng-app >
    <div ng-controller="main">
        
        Test A: {{testa}}<br />
        Test B: {{testb}}<br />
        Test C: {{testc}}<br />
        {{obj.test}}
        
        <div>
            testa (without ng-if): <input type="checkbox" ng-model="testa" />
        </div>
        <div ng-if="!testa">
            testb (with ng-if): <input type="checkbox" ng-model="testb" /> {{testb}}
        </div>
        <div ng-if="!someothervar">
            testc (with ng-if): <input type="checkbox" ng-model="testc" />
        </div>
        <div ng-if="!someothervar">
            object (with ng-if): <input type="checkbox" ng-model="obj.test" />
        </div>
        
    </div>
</div>

因此，您的复选框会更改子范围内的testb，但不会更改外部父范围。

注意，如果要修改父作用域中的数据，则需要修改对象的内部属性，就像我添加的最后一个div一样。

Answer 2

您可以使用$parent来引用父范围中定义的模型，如此

<input type="checkbox" ng-model="$parent.testb" />

Answer 3

您可以使用ngHide （或ngShow）指令。它不像ngIf那样创建子范围。

<div ng-hide="testa">

Answer 4

我们在许多其他情况下都有这个，我们内部决定总是有一个控制器/指令的包装器，这样我们就不需要考虑它了。这是你的包装器的例子。

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.0rc1/angular.min.js"></script>

<script>
    function main($scope) {
        $scope.thisScope = $scope;
        $scope.testa = false;
        $scope.testb = false;
        $scope.testc = false;
        $scope.testd = false;
    }
</script>

<div ng-app >
    <div ng-controller="main">

        Test A: {{testa}}<br />
        Test B: {{testb}}<br />
        Test C: {{testc}}<br />
        Test D: {{testd}}<br />

        <div>
            testa (without ng-if): <input type="checkbox" ng-model="thisScope.testa" />
        </div>
        <div ng-if="!testa">
            testb (with ng-if): <input type="checkbox" ng-model="thisScope.testb" />
        </div>
        <div ng-show="!testa">
            testc (with ng-show): <input type="checkbox" ng-model="thisScope.testc" />
        </div>
        <div ng-hide="testa">
            testd (with ng-hide): <input type="checkbox" ng-model="thisScope.testd" />
        </div>

    </div>
</div>

希望这有帮助， Yishay

Answer 5

是的，ng-hide（或ng-show）指令不会创建子范围。

这是我的做法：

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.0rc1/angular.min.js"></script>

<script>
    function main($scope) {
        $scope.testa = false;
        $scope.testb = false;
        $scope.testc = false;
        $scope.testd = false;
    }
</script>

<div ng-app >
    <div ng-controller="main">

        Test A: {{testa}}<br />
        Test B: {{testb}}<br />
        Test C: {{testc}}<br />
        Test D: {{testd}}<br />

        <div>
            testa (without ng-if): <input type="checkbox" ng-model="testa" />
        </div>
        <div ng-if="!testa">
            testb (with ng-if): <input type="checkbox" ng-model="$parent.testb" />
        </div>
        <div ng-show="!testa">
            testc (with ng-show): <input type="checkbox" ng-model="testc" />
        </div>
        <div ng-hide="testa">
            testd (with ng-hide): <input type="checkbox" ng-model="testd" />
        </div>

    </div>
</div>

http://jsfiddle.net/bn64Lrzu/

Answer 6

你可以这样做，如果你想要一个代码笔，你的mod功能将完美让我知道

  <div ng-repeat="icon in icons">                   
                <div class="row" ng-if="$index % 3 == 0 ">
                    <i class="col col-33 {{icons[$index + n].icon}} custom-icon"></i>
                    <i class="col col-33 {{icons[$index + n + 1].icon}} custom-icon"></i>
                    <i class="col col-33 {{icons[$index + n + 2].icon}} custom-icon"></i>
                </div>
         </div>

Angularjs ng-model在ng-if中不起作用

6 个答案: