angular 在控制器功能中设置 $scope.value 不工作

Question

我试图在指令创建的控制器函数中设置一个 angular 变量值。由于某些未知原因，它以某种方式无法正常工作。该值在独立设置时显示，但在我尝试在控制器函数中分配值时不起作用。

我的代码如下，

<!doctype html>
<html>
<head>
<meta charset="UTF-8" />
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.5/angular.min.js"></script>

</head>
<body>
    <div ng-app="mainApp">
        <div ng-controller="MyController">
            <div id="Details" class="Details">{{Details}}</div></br>
             <div id="Test" class="Test">
             <collection collection='testdata'></collection>             
             </div>          
        </div>              
    </div>
</body>
<script>    
var mainApp = angular.module("mainApp", [])

mainApp.directive('collection', function () {
    return {
        restrict: "E",
        replace: true,
        scope: {collection: '=', showFn : '&'},
        template: "<ul><member ng-repeat='member in collection' member='member'></member></ul>"         
    }
})

mainApp.directive('member', function ($compile) {
    var NewChild = "<li><span ng-click=ShowDetailsFunc()>{{member.TagName}}</span></li>";

    return {
        restrict: "E",
        replace: true,
        scope: {member: '=', ShowHideCtrlFunc : '&', ShowDetailsCtrlFunc : '&'},
        template: NewChild,
        controller: 'MyController',
        link: function (scope, element, attrs) {            
            var collectionSt = '<collection collection="member.children"></collection>';
            if (angular.isArray(scope.member.children)) {               
                    $compile(collectionSt)(scope, function(cloned, scope)   {                                           
                        element.attr('xml-path', scope.member.TagPath);
                        element.append(cloned);                         
                     });                      
                    scope.ShowDetailsFunc = function() {
                        scope.ShowDetailsCtrlFunc(element,event);                     
                    }

            }
        }   

    }
})

mainApp.controller('MyController', function ($scope) {
    $scope.testdata = [{"TagName":"MyRootNode","TagPath":">MyRootNode","children":[{"TagName":"LandXML","TagPath":">MyRootNode>ChildItems>LandXML","children":[{"TagName":"Units","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Units","children":[{"TagName":"Imperial","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[1]>Imperial","children":[]},{"TagName":"Project","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Project","children":[]},{"TagName":"Application","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Application","children":[{"TagName":"Author","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[2]>Author","children":[]},{"TagName":"Alignments","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Alignments","children":[]},{"TagName":"Roadways","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Roadways","children":[{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[1]","children":[]},{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[2]","children":[]},{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[3]","children":[]},{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[4]","children":[]},{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[5]","children":[]}]}]}]}]},{"TagName":"Surfaces","TagPath":">MyRootNode>ChildItems>Surfaces","children":[{"TagName":"Surface1","TagPath":">MyRootNode>ChildItems>ChildItems[2]>Surface1","children":[]},{"TagName":"Surface2","TagPath":">MyRootNode>ChildItems>ChildItems[2]>Surface2","children":[]}]}]}]

    $scope.Details = "defalut value"
    $scope.ShowDetailsCtrlFunc = function(element,event) {
            console.log("in function ShowDetailsCtrlFunc");                     
            var myxmlpath = $(element).attr("xml-path")
            $scope.Details = getObjects($scope.testdata, 'TagPath', myxmlpath)[0].TagName; 
            console.log($scope.Details)                         
            //event.stopImmediatePropagation();
      };    
});
function getObjects(obj, key, val) {
    var objects = [];
    for (var i in obj) {
        if (!obj.hasOwnProperty(i)) continue;
        if (typeof obj[i] == 'object') {
            objects = objects.concat(getObjects(obj[i], key, val));
        } else if (i == key && obj[key] == val) {
            objects.push(obj);
        }
    }
    return objects;
}   
</script>   
</html>

请帮助我了解我在哪里犯了错误以及如何纠正。

请帮忙。非常感谢。

Answer 1

问题是当您以这种循环方式创建指令时，您正在嵌套 MyController-controller。结果是 $scope.Details 设置在特定的嵌套范围而不是在视图中显示值的范围。

您可以通过 $emit 将新值向上游发送并最终达到呈现范围值的更改来解决此问题。

这是一个例子

var mainApp = angular.module("mainApp", [])

mainApp.directive('collection', function () {
    return {
        restrict: "E",
        replace: true,
        scope: {collection: '=', showFn : '&'},
        template: "<ul><member ng-repeat='member in collection' member='member'></member></ul>"         
    }
})

mainApp.directive('member', function ($compile) {
    var NewChild = "<li><span ng-click=ShowDetailsFunc()>{{member.TagName}}</span></li>";

    return {
        restrict: "E",
        replace: true,
        scope: {member: '=', ShowHideCtrlFunc : '&', ShowDetailsCtrlFunc : '&'},
        template: NewChild,
        controller: 'MyController',
        link: function (scope, element, attrs) {            
            var collectionSt = '<collection collection="member.children"></collection>';
            if (angular.isArray(scope.member.children)) {               
                    $compile(collectionSt)(scope, function(cloned, scope)   {                                           
                        element.attr('xml-path', scope.member.TagPath);
                        element.append(cloned);                         
                     });                      
                    scope.ShowDetailsFunc = function() {
                        scope.ShowDetailsCtrlFunc(element);                     
                    }

            }
        }   

    }
})

mainApp.controller('MyController', function ($scope) {
    $scope.testdata = [{"TagName":"MyRootNode","TagPath":">MyRootNode","children":[{"TagName":"LandXML","TagPath":">MyRootNode>ChildItems>LandXML","children":[{"TagName":"Units","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Units","children":[{"TagName":"Imperial","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[1]>Imperial","children":[]},{"TagName":"Project","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Project","children":[]},{"TagName":"Application","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Application","children":[{"TagName":"Author","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[2]>Author","children":[]},{"TagName":"Alignments","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Alignments","children":[]},{"TagName":"Roadways","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Roadways","children":[{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[1]","children":[]},{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[2]","children":[]},{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[3]","children":[]},{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[4]","children":[]},{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[5]","children":[]}]}]}]}]},{"TagName":"Surfaces","TagPath":">MyRootNode>ChildItems>Surfaces","children":[{"TagName":"Surface1","TagPath":">MyRootNode>ChildItems>ChildItems[2]>Surface1","children":[]},{"TagName":"Surface2","TagPath":">MyRootNode>ChildItems>ChildItems[2]>Surface2","children":[]}]}]}]

    $scope.Details = "defalut value";
    $scope.ShowDetailsCtrlFunc = function(element) {
            console.log("in function ShowDetailsCtrlFunc");                     
            var myxmlpath = angular.element(element).attr("xml-path")
            var detail = getObjects($scope.testdata, 'TagPath', myxmlpath)[0].TagName; 
            console.log(detail);
            $scope.$emit('detailSelected',detail);
            //event.stopImmediatePropagation();
      };
      $scope.$on('detailSelected',function($event, message){
      $scope.Details = message;
    });
});
function getObjects(obj, key, val) {
    var objects = [];
    for (var i in obj) {
        if (!obj.hasOwnProperty(i)) continue;
        if (typeof obj[i] == 'object') {
            objects = objects.concat(getObjects(obj[i], key, val));
        } else if (i == key && obj[key] == val) {
            objects.push(obj);
        }
    }
    return objects;
}

<!doctype html>
<html>
<head>
<meta charset="UTF-8" />
<script data-require="angularjs@1.6.4" data-semver="1.6.4" src="https://code.angularjs.org/1.6.4/angular.min.js"></script>

</head>
<body>
    <div ng-app="mainApp">
        <div ng-controller="MyController">
            <div id="Details" class="Details">{{Details}}</div></br>
             <div id="Test" class="Test">
             <collection collection='testdata'></collection>             
             </div>          
        </div>              
    </div>
</body>
  
</html>

angular 在控制器功能中设置 $scope.value 不工作

angular set $scope.value in controller function is not working

javascript

angularjs

angularjs-directive