javascript - typescript 错误 : A 'super' call must be the first statement in the constructor when a class contains initialized properties

Question

我的项目中有以下 typescript 错误.. 让我分享一下 一个示例，以便您了解正在处理的内容。

module CoreWeb {
export class Controller implements IController {
    public $q;
    public $rootScope;
    public $scope:ng.IScope;
    public $state:ng.ui.IStateService;
    public $translate:ng.translate.ITranslateService;
    public appEvents;
    public commonValidationsService;
    public defaultPagingOptions = {
        currentPage: 1,
        pageSize: 10,
        totalServerItems: 0,
        maxSize: 5
    };
    public detailModelName:string;
    public filter:string;
    public listModelName:string;
    public mode;
    public modelDataService;
    public modelDefaultProperty:string;
    public ngDialog;
    public notificationsService;
    public pagingOptions:IPagingOptions;
    public selectionStatus:boolean;
    public serviceCreateFunction:string;
    public serviceGetAllCanceller:ng.IDeferred<any>;
    public serviceGetAllFunction:string;
    public serviceGetOneFunction:string;
    public serviceUpdateFunction:string;
    public showInactive:boolean;
    public tableAction:number;
    public tableActions:ITableAction[];
    public titleDataFactory;
    public validationOptions;
    public validationRules;
    public orderBy = null;
    public orderType = null;
    constructor(
        $q:ng.IQService,
        $rootScope,
        $scope:ng.IScope,
        $state,
        $translate:ng.translate.ITranslateService,
        appEvents,
        commonValidationsService,
        detailModelName:string,
        listModelName:string,
        modelDataService,
        modelDefaultProperty:string,
        ngDialog,
        notificationsService,
        serviceCreateFunction:string,
        serviceGetAllFunction:string,
        serviceGetOneFunction:string,
        serviceUpdateFunction:string,
        titleDataFactory
    ) {
        this.$q = $q;
        this.$rootScope = $rootScope;
        this.$scope = $scope;
        this.$state = $state;
        this.$translate = $translate;
        this.appEvents = appEvents;
        this.commonValidationsService = commonValidationsService;
        this.detailModelName = detailModelName;
        this.listModelName = listModelName;
        this.modelDataService = modelDataService;
        this.modelDefaultProperty = modelDefaultProperty;
        this.ngDialog = ngDialog;
        this.notificationsService = notificationsService;
        this.serviceCreateFunction = serviceCreateFunction;
        this.serviceGetAllCanceller = $q.defer();
        this.serviceGetAllFunction = serviceGetAllFunction;
        this.serviceGetOneFunction = serviceGetOneFunction;
        this.serviceUpdateFunction = serviceUpdateFunction;
        this.titleDataFactory = titleDataFactory;

        this.mode = $rootScope.modeEnum.none;
        this.pagingOptions = this.defaultPagingOptions;
        this.selectionStatus = false;
        this.showInactive = false;
        this.tableAction = null;
        this.tableActions = [
            {id: 1, name: "Activate"},
            {id: 2, name: "Deactivate"}
        ];
        this.validationOptions = {showErrors: commonValidationsService.modes.property, showNotification: true};

        this.activate();
    }

这是扩展 Controller 类的类..其中之一

declare var App: ng.IModule;

module CoreWeb {
    export class EntityMasterController extends Controller {
        private currenciesDataSet;
        private entity: IEntityMasterModel;
        private merchandisingConstants;
        private typeAheadOptions;

    constructor(
        $q:ng.IQService,
        $rootScope,
        $scope:ng.IScope,
        $state,
        $translate:ng.translate.ITranslateService,
        appEvents,
        commonValidationsService,
        entityDataService,
        merchandisingConstants,
        ngDialog,
        notificationsService,
        titleDataFactory
    ) {
        this.merchandisingConstants = merchandisingConstants;
        super(
            $q,
            $rootScope,
            $scope,
            $state,
            $translate,
            appEvents,
            commonValidationsService,
            "entity",
            null,
            entityDataService,
            "name",
            ngDialog,
            notificationsService,
            "createEntity",
            "getCurrentEntity",
            "getEntity",
            "updateEntity",
            titleDataFactory
        );
    }

现在，如果我像上面那样在 super 调用之前初始化 merchandisingConstants。我在 gulp 期间收到以下错误，我的页面不显示任何内容。当类包含已初始化的属性或具有参数属性时，super 调用必须是构造函数中的第一条语句。我已经尝试了所有我能想到的方法来修复这些错误，知道我该怎么做吗？

Answer 1

当你扩展一个类时，你的构造函数:

1. 必须调用super()
2. 必须在它做任何事情之前做这件事

在您的实例中，您只需要重新排序:

declare var App: ng.IModule;

module CoreWeb {
    export class EntityMasterController extends Controller {
        private currenciesDataSet;
        private entity: IEntityMasterModel;
        private merchandisingConstants;
        private typeAheadOptions;

    constructor(
        $q:ng.IQService,
        $rootScope,
        $scope:ng.IScope,
        $state,
        $translate:ng.translate.ITranslateService,
        appEvents,
        commonValidationsService,
        entityDataService,
        merchandisingConstants,
        ngDialog,
        notificationsService,
        titleDataFactory
    ) {
        // Must be first
        super(
            $q,
            $rootScope,
            $scope,
            $state,
            $translate,
            appEvents,
            commonValidationsService,
            "entity",
            null,
            entityDataService,
            "name",
            ngDialog,
            notificationsService,
            "createEntity",
            "getCurrentEntity",
            "getEntity",
            "updateEntity",
            titleDataFactory
        );

        this.merchandisingConstants = merchandisingConstants;
    }