Question

我正在学习AngularJS和TypeScript，并构建了一个非常基本的应用程序来让自己继续前进。

一个将元素指令加载到页面上的应用程序，非常简单，但我一直遇到错误：＆＃34;未捕获的TypeError：无法读取属性＆＃39;指令＆＃39; of null＆＃34;当试图加载指令钩。

我理解为什么会发生这种情况，但我无法在互联网上找到有关如何解决此问题的任何信息。

TS供参考：

app.ts

namespace playground.core
{
    "use strict";

    export let playgroundApp: ng.IModule = angular.module("playgroundApp", []);
    export let compileProvider: ng.ICompileProvider = null;

    playgroundApp.config(($compileProvider: ng.ICompileProvider, $controllerProvider: ng.IControllerProvider) => {
        (<any>$controllerProvider).allowGlobals();
        compileProvider = $compileProvider;
    }); 

    angular.element(document).ready(() => { angular.bootstrap(document, ["playgroundApp"]); });
}

PlaygroundController.ts

namespace playground.controllers
{
    "use strict";
    export interface IPlaygroundScope extends ng.IScope
    {

    }

    export class PlaygroundController
    {
        static $inject: string[] = ["$scope", "$element"];

        private scope: IPlaygroundScope;

        constructor($scope: IPlaygroundScope, $element: ng.IRootElementService)
        {
            this.scope = $scope;
        }
    }
}

directive.ts

namespace playground.directives
{
    "use strict";

    export interface ILoaderScope extends ng.IScope
    {

    }

    export class LoaderDirective
    {
        private scope: ILoaderScope;

        constructor($scope: ILoaderScope, $rootElement: ng.IRootElementService, $attributes: ng.IAttributes, $compile: ng.ICompileService)
        {
            this.scope = $scope;
        }
    }

    playground.core.compileProvider.directive.apply(null, ["loader", ["$compile", ($compile: ng.ICompileService) =>
    {
        return {
            restrict: "E",
            replace: true,
            templateUrl: "template.html",
            scope: {

            },
            link: ($scope: ILoaderScope, $rootElement: ng.IRootElementService, $attributes: ng.IAttributes) =>
            {
                return new LoaderDirective($scope, $rootElement, $attributes, $compile);
            }
        };
    }]]);
}

的index.html

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <meta charset="utf-8" />
    <link href="App_Themes/Designer/designer.css" rel="stylesheet" />
</head>
<body data-ng-controller="playground.controllers.PlaygroundController">

    <div k2-loader=""></div>

    <script src="scripts/jquery.min.js"></script>
    <script src="scripts/angular.min.js"></script>    
    <script src="scripts/go-debug.js"></script>

    <script src="core/app.js"></script>
    <script src="controllers/PlaygroundController.js"></script>
    <script src="directives/loader/directive.js"></script>

    <script type="text/javascript">

        "use strict";        

    </script>
</body>
</html>

在directive.ts中抛出异常： playground.core.compileProvider .directive.apply ...因为 playgroundApp.config（...）似乎有延迟仅在指令加载后才被调用。

有没有办法让这个场景工作，而不必将指令调用包装在 setTimeout（...）中？

更新

所以我最终将指令部分包装在支票中，并且仍然使用setTimeout，因为似乎没有其他解决方案。

namespace playground.directives
{
    "use strict";

    export interface ILoaderScope extends ng.IScope
    {

    }

    export class LoaderDirective
    {
        private scope: ILoaderScope;

        constructor($scope: ILoaderScope, $rootElement: ng.IRootElementService, $attributes: ng.IAttributes, $compile: ng.ICompileService)
        {
            console.log("constructor");
            this.scope = $scope;
        }
    }

    let load = (): void =>
    {
        if (playground.core && playground.core.appCompileProvider)
        {
            playground.core.appCompileProvider.directive.apply(null, ["loader", ["$compile", ($compile: ng.ICompileService): ng.IDirective =>
            {
                return <ng.IDirective>{
                    restrict: "E",                  
                    templateUrl: "directives/loader/template.html",
                    scope: {
                    },
                    link: ($scope: ILoaderScope, $rootElement: ng.IRootElementService, $attributes: ng.IAttributes): LoaderDirective =>
                    {
                        return new LoaderDirective($scope, $rootElement, $attributes, $compile);
                    }
                };
            }]]);
        }
        else
        {
            setTimeout(load);
        }
    };

    load();
}

Answer 1

试试这个，

namespace playground.core
{
    "use strict";

    export let playgroundApp: ng.IModule = angular.module("playgroundApp", []);
    export let compileProvider: ng.ICompileProvider = null;

    playgroundApp.config(($compileProvider: ng.ICompileProvider, $controllerProvider: ng.IControllerProvider) => {
        (<any>$controllerProvider).allowGlobals();
        compileProvider = $compileProvider;
    }); 

    angular.bootstrap(document, ["playgroundApp"]);
}

你不应该依赖文件加载来引导角度。也许，这会拖延这个过程。

AngularJS 1.5配置延迟

1 个答案: