Tips for utilizing $rootScope define within one angular service in another service with typescript

Question

Tips for utilizing $rootScope define within one angular service in another service with typescript

Within a service class, I have initialized a $rootScope in the constructor and assigned a property to it using this.$rootScope. However, when attempting to access this property in another service within the same class, a new $rootScope is created and the property becomes undefined.

How can I resolve this issue? Is there a way to do this in Angular?

I previously asked this question on Stack Overflow.

EDIT:


export class DataService {

    betterApproach = "value";

    constructor(private $rootScope: any){
        $rootScope.someProperty ="some value";
    }

    setBetterApproach(data){
        this.betterApproach=data;
    }

    getBetterApproach() {
        return this.betterApproach;
    }
}

angular.module("services").service("dataService", ['$rootScope', DataService]);

class ConsumingService{
    test:any;

    constructor(private $rootScope: any ,
                private dataService : DataService ){

        this.test = $rootScope.someProperty;
        this.test = dataService.getBetterApproach();  // Still returns old value
    }
}

angular.module("services").service("ConsumingService", ['$rootScope', 'DataService',ConsumingService]);

When should I call setsetBetterApproach in DataController?


class DataCtrl{

    constructor(private dataService: Dataservice){

    }

    myData(){
        //this is ng-Click function
        this.dataService.setBetterApproach("new Data");
    }
}

I seem to be making some mistake as the value in betterApproach remains as 'value' instead of changing to 'newData'.

javascript angularjs typescript typescript1.5

Answer 1

Answer №1

Do you prefer to utilize the same $rootScope instance?

If so, then make sure to inject your $rootScope into your services instead of creating new ones...

For example:

export class DataService {

    betterApproach = "value";

    constructor(private $rootScope: any){
        $rootScope.someProperty ="some value";

        betterApproach = "other value";
    }

    getBetterApproach() {
        return this.betterApproach;
    }
}

angular.module("services").service("dataService", ['$rootScope', DataService]);

Using Service:

export class ConsumingService{
    test:any;
    constructor(private $rootScope: any ,
                private dataService : DataService ){

        this.test = $rootScope.someProperty;

        this.test = dataService.getBetterApproach();
    }


}

angular.module("services").service("ConsumingService", ['$rootScope', 'DataService',ConsumingService]);

Reason why your example didn't work as expected:

To access a class variable, you need to use this.test
The type of $rootScope is likely not from ng.cookies.ICookieStoreService; consider creating your own interface for $rootScope

When injecting your DataService into your Consumingservice, you actually don't need $rootScope at all. Look at betterApproach, You can directly access it like dataService.betterApproach, but using the getter function is much cleaner.

Answer 2

Do you prefer to utilize the same $rootScope instance?

If so, then make sure to inject your $rootScope into your services instead of creating new ones...

For example:

export class DataService {

    betterApproach = "value";

    constructor(private $rootScope: any){
        $rootScope.someProperty ="some value";

        betterApproach = "other value";
    }

    getBetterApproach() {
        return this.betterApproach;
    }
}

angular.module("services").service("dataService", ['$rootScope', DataService]);

Using Service:

export class ConsumingService{
    test:any;
    constructor(private $rootScope: any ,
                private dataService : DataService ){

        this.test = $rootScope.someProperty;

        this.test = dataService.getBetterApproach();
    }


}

angular.module("services").service("ConsumingService", ['$rootScope', 'DataService',ConsumingService]);

Reason why your example didn't work as expected:

To access a class variable, you need to use this.test
The type of $rootScope is likely not from ng.cookies.ICookieStoreService; consider creating your own interface for $rootScope

When injecting your DataService into your Consumingservice, you actually don't need $rootScope at all. Look at betterApproach, You can directly access it like dataService.betterApproach, but using the getter function is much cleaner.

Answer 3

Answer №2

When utilizing the dataService that has been created, remember to include the following code:

import {DataService} from 'pathName';

The basic implementation for the above section involves declaring an interface for the DataService class to abstract variables and methods.

export interface IfcDataService {
    getShare(): string;
    setShare(data: string): void;
}

Import the dataService interface and define its functions within it.

import {IfcDataService} from 'pathName for IfcDataService';

export default class DataService implements IfcDataService{
   public share: string = "injectDataService";

   constructor(){

   }

   public getShare(): string{
       return this.share;
   }

   public setShare(data: string): void{
       this.share = data;
   }
}

DataService.$inject=[];

To utilize the dataService in another service class, import its interface method.

import {IfcDataService} from 'pathName'
import {IfcUseDataService} from 'pathName'

export class UseDataService implements IfcUseDataService{


public dataService: IfcDataService;

constructor (dataService: IfcDataService) {
   this.dataService = dataService;
}

    public useDataService() {
       console.log(this.dataService.getShare());
    }
}

UseDataService.$inject = ['DataService'];

Avoid defining common variables on $rootScope as it may impact testing. To handle global variables, define setter and getter functions within the dataService and inject dataService.ts accordingly in their respective locations.

For insights on large-scale application architecture and access to GitHub code, refer to this resource.

Answer 4

When utilizing the dataService that has been created, remember to include the following code:

import {DataService} from 'pathName';

The basic implementation for the above section involves declaring an interface for the DataService class to abstract variables and methods.

export interface IfcDataService {
    getShare(): string;
    setShare(data: string): void;
}

Import the dataService interface and define its functions within it.

import {IfcDataService} from 'pathName for IfcDataService';

export default class DataService implements IfcDataService{
   public share: string = "injectDataService";

   constructor(){

   }

   public getShare(): string{
       return this.share;
   }

   public setShare(data: string): void{
       this.share = data;
   }
}

DataService.$inject=[];

To utilize the dataService in another service class, import its interface method.

import {IfcDataService} from 'pathName'
import {IfcUseDataService} from 'pathName'

export class UseDataService implements IfcUseDataService{


public dataService: IfcDataService;

constructor (dataService: IfcDataService) {
   this.dataService = dataService;
}

    public useDataService() {
       console.log(this.dataService.getShare());
    }
}

UseDataService.$inject = ['DataService'];

Avoid defining common variables on $rootScope as it may impact testing. To handle global variables, define setter and getter functions within the dataService and inject dataService.ts accordingly in their respective locations.

For insights on large-scale application architecture and access to GitHub code, refer to this resource.

Tips for utilizing $rootScope define within one angular service in another service with typescript

Answer №1

Answer №2

Similar questions

How to align two <select> elements side by side using Bootstrap

Utilizing Angular 2: Implementing a template-driven form to send data from a chosen element to the submitting object

What are some methods to troubleshoot $injector type errors in TypeScript?

Having issues with my script in Node.js where I am getting a TypeError when trying to make a https request. How can I properly

Why is the current Menu Item highlight feature not functioning properly?

Despite using Angular UI calendar, the variable $scope.events is still left undefined

The conceal feature doesn't appear to be functioning properly on jQuery Mobile

displaying li tag depending on the index value within angularjs

JavaScript query-string encoding

autoprefixer now recommends using print-color-adjust instead of color-adjust. The color-adjust shorthand has been marked as deprecated and should be

Cheerio's method of extracting data from an HTML table using web scraping

Angular dropdown menu with 2 options

In Typescript, it is not possible to use generics as a function parameter in a

What is the reason behind re-rendering pages specifically for error messages in express and nodejs?

Unveil the content of a string by applying Base64 decoding in AngularJS

I require the variable to be accessible from all corners

Trouble with value updating in PostgreSQL with NodeJs

What is the syntax for accessing elements from an iterable?

Updating an element within a for loop using Angular TypeScript

What could be causing the CSS transforms to not show up on the page?