Managing $scope within TypeScript code for an AngularJS controller

When using the following code snippet, $scope and $mdDialog are required to be static.

declare var module: any;
export interface IChangePassword extends ng.IScope {
    cancel: Function;
    myname: string;
    state: string;
    processRequest: Function;
    CurrentPassword: string;
    NewPassword: string;
    ConfirmPassword: string;
}

export class ChangePasswordController {
    static $inject = ["$scope", "$mdDialog","$timeout"];
    static $mdDialog: any;
    static $timeout: any;
    state: string = 'getInput';
    static $scope: IChangePassword;
    CurrentPassword: string;
    NewPassword: string;
    ConfirmPassword: string;
    ChangePasswordService: any;

    constructor($scope: IChangePassword, $mdDialog: any, $timeout: any) {
        ChangePasswordController.$mdDialog = $mdDialog;
        ChangePasswordController.$scope = $scope;
        $scope.state = this.state;
        $scope.cancel = this.cancel;
        $scope.processRequest = this.processRequest;
       //this.ChangePasswordService = ChangePasswordService;
        ChangePasswordController.$timeout = $timeout;
    }

   public cancel ():void {
        ChangePasswordController.$mdDialog.cancel();
    };

    public processRequest(): void {
        ChangePasswordController.$scope.state = 'processRequest';
        ChangePasswordController.$timeout(function () {
            ChangePasswordController.$scope.state = 'Done';
        }, 5000);

    }


}

module.exports = function (app) {
    app.controller("ChangePasswordController", ChangePasswordController);
}

The following code does not work as expected. The reference to this.$scope is always null within processRequest(). Assistance needed.

export class ChangePasswordController {
    static $inject = ["$scope", "$mdDialog","$timeout"];
    static $mdDialog: any;
    static $timeout: any;
    state: string = 'getInput';
    $scope: IChangePassword;
    CurrentPassword: string;
    NewPassword: string;
    ConfirmPassword: string;
    ChangePasswordService: any;
    //myname: string = 'gaurav';
    constructor($scope: IChangePassword, $mdDialog: any, $timeout: any) {
        ChangePasswordController.$mdDialog = $mdDialog;
        this.$scope = $scope;
        $scope.state = this.state;
        $scope.cancel = this.cancel;
        $scope.processRequest = this.processRequest;
       //this.ChangePasswordService = ChangePasswordService;
        ChangePasswordController.$timeout = $timeout;
    }

   public cancel ():void {
        ChangePasswordController.$mdDialog.cancel();
    };

    public processRequest(): void {
        this.$scope.state = 'processRequest';
        ChangePasswordController.$timeout(function () {
            this.state = 'Done';
        }, 5000);

    }


}

module.exports = function (app) {
    app.controller("ChangePasswordController", ChangePasswordController);
}

An issue arises where $scope is not accessible as an instance variable in the provided code. Suggestions for improvement would be greatly appreciated.

Thank you.

Answer №1

An issue arises when passing processRequest to $scope without properly binding the current object as this within the function. In JavaScript, the value of this is dependent on the caller rather than the context in which it is declared. To address this, you can either utilize bind to associate the current object with the function or opt for an arrow function that captures this from the declaration context:

$scope.processRequest = this.processRequest.bind(this);
$scope.processRequest = () => this.processRequest();

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