当模型元素从模型数组拼接时,AngularJS：ng-repeat列表不更新

发布时间：2020-12-17 09:12:32 所属栏目：安全来源：网络整理

导读：我有两个控制器，并在它们之间用app.factory函数共享数据。当单击链接时，第一个控制器在模型数组(pluginsDisplayed)中添加一个小部件。窗口小部件被推入数组，并且此更改反映到视图中(使用ng-repeat显示数组内容)： div ng-repeat="pluginD in pluginsDisp

我有两个控制器，并在它们之间用app.factory函数共享数据。

当单击链接时，第一个控制器在模型数组(pluginsDisplayed)中添加一个小部件。窗口小部件被推入数组，并且此更改反映到视图中(使用ng-repeat显示数组内容)：

<div ng-repeat="pluginD in pluginsDisplayed">
    <div k2plugin pluginname="{{pluginD.name}}" pluginid="{{pluginD.id}}"></div>
</div>

该小部件建立在三个指令，k2plugin，删除和调整大小。 remove指令将一个范围添加到k2plugin指令的模板中。当单击所述跨度时，使用Array.splice()删除共享数组中的正确元素。共享阵列已正确更新，但更改不会反映在视图中。但是，当添加另一个元素时，在删除后，视图会正确刷新，并且不会显示先前删除的元素。

我错了什么？你能解释我为什么这不工作吗？
有没有更好的方法来做我想使用AngularJS？

这是我的index.html：

<!doctype html>
<html>
    <head>
        <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.5/angular.min.js">
        </script>
        <script src="main.js"></script>
    </head>
    <body>
        <div ng-app="livePlugins">
            <div ng-controller="pluginlistctrl">
                <span>Add one of {{pluginList.length}} plugins</span>
                <li ng-repeat="plugin in pluginList">
                    <span><a href="" ng-click="add()">{{plugin.name}}</a></span>
                </li>
            </div>
            <div ng-controller="k2ctrl">
                <div ng-repeat="pluginD in pluginsDisplayed">
                    <div k2plugin pluginname="{{pluginD.name}}" pluginid="{{pluginD.id}}"></div>
                </div>
            </div>
        </div>
    </body>
</html>

这是我的main.js：

var app = angular.module ("livePlugins",[]);

app.factory('Data',function () {
    return {pluginsDisplayed: []};
});

app.controller ("pluginlistctrl",function ($scope,Data) {
    $scope.pluginList = [{name: "plugin1"},{name:"plugin2"},{name:"plugin3"}];
    $scope.add = function () {
        console.log ("Called add on",this.plugin.name,this.pluginList);
        var newPlugin = {};
        newPlugin.id = this.plugin.name + '_'  + (new Date()).getTime();
        newPlugin.name = this.plugin.name;
        Data.pluginsDisplayed.push (newPlugin);
    }
})

app.controller ("k2ctrl",Data) {
    $scope.pluginsDisplayed = Data.pluginsDisplayed;

    $scope.remove = function (element) {
        console.log ("Called remove on ",this.pluginid,element);

        var len = $scope.pluginsDisplayed.length;
        var index = -1;

        // Find the element in the array
        for (var i = 0; i < len; i += 1) {
            if ($scope.pluginsDisplayed[i].id === this.pluginid) {
                index = i;
                break;
            }
        }

        // Remove the element
        if (index !== -1) {
            console.log ("removing the element from the array,index: ",index);
            $scope.pluginsDisplayed.splice(index,1);
        }

    }
    $scope.resize = function () {
        console.log ("Called resize on ",this.pluginid);
    }
})

app.directive("k2plugin",function () {
    return {
        restrict: "A",scope: true,link: function (scope,elements,attrs) {
            console.log ("creating plugin");

            // This won't work immediately. Attribute pluginname will be undefined
            // as soon as this is called.
            scope.pluginname = "Loading...";
            scope.pluginid = attrs.pluginid;

            // Observe changes to interpolated attribute
            attrs.$observe('pluginname',function(value) {
                console.log('pluginname has changed value to ' + value);
                scope.pluginname = attrs.pluginname;
            });

            // Observe changes to interpolated attribute
            attrs.$observe('pluginid',function(value) {
                console.log('pluginid has changed value to ' + value);
                scope.pluginid = attrs.pluginid;
            });
        },template: "<div>{{pluginname}} <span resize>_</span> <span remove>X</span>" +
                       "<div>Plugin DIV</div>" +
                  "</div>",replace: true
    };
});

app.directive("remove",function () {
    return function (scope,element,attrs) {
        element.bind ("mousedown",function () {
            scope.remove(element);
        })
    };

});

app.directive("resize",function () {
            scope.resize(element);
        })
    };
});

每当你在AngularJS之外做一些形式的操作，比如使用jQuery调用Ajax，或者将一个事件绑定到一个像你这样的元素，你需要让AngularJS知道更新自己。这里是你需要做的代码更改：

app.directive("remove",function () {
            scope.remove(element);
            scope.$apply();
        })
    };

});

app.directive("resize",function () {
            scope.resize(element);
            scope.$apply();
        })
    };
});

这里是文档：https://docs.angularjs.org/api/ng/type/$rootScope.Scope#$apply

（编辑：李大同）

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