Assigning dynamic key value pairs in Angular 4 using Typescript

Question

Assigning dynamic key value pairs in Angular 4 using Typescript

I'm currently attempting to construct an object using keys that are specified in an environment file, meaning the keys would vary depending on the environment.

import { environment } from '../environments/environment'

export abstract class AbstractAPIService {
    fieldValues[environment.stateDropdownID] = ['Al', 'AK', 'CT', ....]
}

Nevertheless, I encountered the following error from the compiler: '=' expected.

Is there a way to achieve this functionality in Angular 4 or TypeScript in general?

Appreciate any assistance!

angular typescript

Answer 1

Answer №1

In the Parameter properties of the class, dynamic key assignment cannot be performed; however, it can be achieved in the constructor or methods of the class. The implementation would look something like this:

import { environment } from '../environments/environment'

export abstract class AbstractAPIService {
    fieldValues: object = {};

    constructor() {
        this.fieldValues[environment.stateDropdownID] = ['Al', 'AK', 'CT', ....];
    }
}

For a practical example using Angular, check out this plunker.

I hope this explanation is helpful!

Answer 2

In the Parameter properties of the class, dynamic key assignment cannot be performed; however, it can be achieved in the constructor or methods of the class. The implementation would look something like this:

import { environment } from '../environments/environment'

export abstract class AbstractAPIService {
    fieldValues: object = {};

    constructor() {
        this.fieldValues[environment.stateDropdownID] = ['Al', 'AK', 'CT', ....];
    }
}

For a practical example using Angular, check out this plunker.

I hope this explanation is helpful!

Answer 3

Answer №2

When it comes to Angular, it operates within the browser environment. While there may not be a specific environment for it, you have the option to include your environment variables in configuration files during the app building process. Alternatively, you can set different values depending on whether the app is in development or production stage using the isDevMode API as outlined here.

Answer 4

When it comes to Angular, it operates within the browser environment. While there may not be a specific environment for it, you have the option to include your environment variables in configuration files during the app building process. Alternatively, you can set different values depending on whether the app is in development or production stage using the isDevMode API as outlined here.

Answer 5

Answer №3

For optimal implementation, I would follow Alexander's advice and initialize this in the constructor. However, if you prefer, it is indeed feasible to assign it directly like so:

import { settings } from '../configurations/settings'

export abstract class APIService {
    dataValues = {
        [settings.dropdownID]: ['California', 'New York', 'Texas', ....]
    }
}

Answer 6

For optimal implementation, I would follow Alexander's advice and initialize this in the constructor. However, if you prefer, it is indeed feasible to assign it directly like so:

import { settings } from '../configurations/settings'

export abstract class APIService {
    dataValues = {
        [settings.dropdownID]: ['California', 'New York', 'Texas', ....]
    }
}

Assigning dynamic key value pairs in Angular 4 using Typescript

Answer №1

Answer №2

Answer №3

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