Using constants is a great way to streamline the process of displaying labels in a user interface built with Angular

Question

Using constants is a great way to streamline the process of displaying labels in a user interface built with Angular

Is there a way to dynamically display labels on my web page using constants, properties, or a JSON file in Angular 7?

The goal is to allow for easy updates of label text without directly changing the HTML files. Instead, I want to be able to update a constants, JSON, or properties file and have those changes reflect across all relevant HTML pages. For example, if I have a label like {{lblManage}}, I could simply change the corresponding value in another file, such as lblManage = Manage Task.

angular typescript

Answer 1

Answer №1

Angular comes with pre-defined environment constant files

/YourApp/src/environments/environment.ts -> for non-prod environments, such as using ng serve.

and

/YourApp/src/environments/environment.prod.ts -> for prod environments, like when using ng build --prod

For example, in environment.ts:

export const environment = {  
 production: false,
 apiUrl: 'http://example.com/api'
};

You can add custom properties in the file and then access them across your code like this:

import { environment } from './environment';
...
apiURL = environment.apiUrl;

Answer 2

Angular comes with pre-defined environment constant files

/YourApp/src/environments/environment.ts -> for non-prod environments, such as using ng serve.

and

/YourApp/src/environments/environment.prod.ts -> for prod environments, like when using ng build --prod

For example, in environment.ts:

export const environment = {  
 production: false,
 apiUrl: 'http://example.com/api'
};

You can add custom properties in the file and then access them across your code like this:

import { environment } from './environment';
...
apiURL = environment.apiUrl;

Answer 3

Answer №2

Answering the second part of the question:

The objective is to allow users to modify text within labels in the HTML by making changes in a constants/json/properties file instead of directly editing the HTML files. This way, any modifications made in the constants file will automatically update the text across all applicable HTML pages. For instance, {{lblManage}} could be defined as lblManage = "Manage Ta" in another file. As previously suggested, constants can be declared in the environment.ts file and if dynamic updates are required, the store concept can be employed. Variables stored in the environment file can be managed through the store and updated as needed.

Reducer file:

export interface ConstantState {
url: any
}

export const initialState: ConstantState = {
url:'http://hello.com'
}

export function constantReducer(
state: ConstantState = initialState,
action: ConstantAction
): BookingState {
switch (action.type) {
case 'GET_STATE': {
state = {
...state,

};

break;
}
case 'SET_STATE': {
return {
...state,
url: action.payload
};
break;
}
}
return state;
}

Action FILE

import { Action } from '@ngrx/store';

export enum ConstantActionTypes {
GetConstant = '[Constant] Get',
SetConstant = '[Constant] Set'
}

export class GetConstant implements Action {
readonly type = ConstantActionTypes.GetConstant;
}

export class SetConstant implements Action {
readonly type = ConstantActionTypes.SetConstant;
constructor(payload: any){}
}

export type ConstantAction = GetConstant | SetConstant;

Create a selector: const getConstantState = createFeatureSelector('constantState');

This allows us to dispatch actions on the required page when updating constants, and retrieve values using the selector method. It's important to note that constants are immutable, so naming conventions should reflect this limitation.

Answer 4

Answering the second part of the question:

The objective is to allow users to modify text within labels in the HTML by making changes in a constants/json/properties file instead of directly editing the HTML files. This way, any modifications made in the constants file will automatically update the text across all applicable HTML pages. For instance, {{lblManage}} could be defined as lblManage = "Manage Ta" in another file. As previously suggested, constants can be declared in the environment.ts file and if dynamic updates are required, the store concept can be employed. Variables stored in the environment file can be managed through the store and updated as needed.

Reducer file:

export interface ConstantState {
url: any
}

export const initialState: ConstantState = {
url:'http://hello.com'
}

export function constantReducer(
state: ConstantState = initialState,
action: ConstantAction
): BookingState {
switch (action.type) {
case 'GET_STATE': {
state = {
...state,

};

break;
}
case 'SET_STATE': {
return {
...state,
url: action.payload
};
break;
}
}
return state;
}

Action FILE

import { Action } from '@ngrx/store';

export enum ConstantActionTypes {
GetConstant = '[Constant] Get',
SetConstant = '[Constant] Set'
}

export class GetConstant implements Action {
readonly type = ConstantActionTypes.GetConstant;
}

export class SetConstant implements Action {
readonly type = ConstantActionTypes.SetConstant;
constructor(payload: any){}
}

export type ConstantAction = GetConstant | SetConstant;

Create a selector: const getConstantState = createFeatureSelector('constantState');

This allows us to dispatch actions on the required page when updating constants, and retrieve values using the selector method. It's important to note that constants are immutable, so naming conventions should reflect this limitation.

Answer 5

Answer №3

To read a json file in your Angular application, you can follow this code snippet:

import { HttpClient } from '@angular/common/http'; 
import { Observable } from 'rxjs';

@Injectable()
export class JSONReaderService {

   constructor(private http: HttpClient) {
        this.readJSON().subscribe(data => {
            console.log(data);
        });
    }

    public readJSON(): Observable<any> {
        return this.http.get("./assets/constants/properties/json");
    }
}

After creating the service, you can use it as shown below:

   label: any;

   constructor(private jsonReaderService: JSONReaderService) {
      this.label = this.fetchConstant(lblMAnage);

}

   fetchConstant(lblMAnage){
       this.jsonReaderService.readJSON().subscribe((yourLabel)=> {
            console.log(yourLabel);
            this.label = yourLabel.lblMAnage;
        });
   }

Answer 6

To read a json file in your Angular application, you can follow this code snippet:

import { HttpClient } from '@angular/common/http'; 
import { Observable } from 'rxjs';

@Injectable()
export class JSONReaderService {

   constructor(private http: HttpClient) {
        this.readJSON().subscribe(data => {
            console.log(data);
        });
    }

    public readJSON(): Observable<any> {
        return this.http.get("./assets/constants/properties/json");
    }
}

After creating the service, you can use it as shown below:

   label: any;

   constructor(private jsonReaderService: JSONReaderService) {
      this.label = this.fetchConstant(lblMAnage);

}

   fetchConstant(lblMAnage){
       this.jsonReaderService.readJSON().subscribe((yourLabel)=> {
            console.log(yourLabel);
            this.label = yourLabel.lblMAnage;
        });
   }

Answer 7

Answer №4

To showcase the labels on my page using information from constants/properties/json file, you can take advantage of the environment files located in the environment directory. Alternatively, if internationalization is your preference, consider using i18n.

Subsequently, import and use it in the component. For instance, if you opt for the first method:

import { environment } from './environment';

you can then retrieve it as

environment.constant_name

Answer 8

To showcase the labels on my page using information from constants/properties/json file, you can take advantage of the environment files located in the environment directory. Alternatively, if internationalization is your preference, consider using i18n.

Subsequently, import and use it in the component. For instance, if you opt for the first method:

import { environment } from './environment';

you can then retrieve it as

environment.constant_name

Using constants is a great way to streamline the process of displaying labels in a user interface built with Angular

Answer №1

Answer №2

Answer №3

Answer №4

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