Tips for accessing an item from a separate TypeScript document (knockout.js)

Question

Tips for accessing an item from a separate TypeScript document (knockout.js)

In the scenario where I need to utilize an object from another TypeScript file, specifically when I have an API response in one.ts that I want to use in two.ts.

I attempted exporting and importing components but encountered difficulties.

This code snippet can be found in my one.ts:

getDealStatusInfo(dealid) {
            var statusRes
            DealApiControllers.GetDealStatus(dealid,
                (response) => {
                    statusRes = response;
                    console.log(statusRes)
                },
                (error) => {
                    console.error(error);
                });

        }

The aim is to access the statusRes object in two.ts.

typescript knockout.js

Answer 1

Answer №1

It is important for the exported variable to be outside the function scope.

In file One.ts:

export var statusRes;
getDealStatusInfo(dealid) {
            DealApiControllers.GetDealStatus(dealid,
                (response) => {
                    statusRes = response;
                    console.log(statusRes)
                },
                (error) => {
                    console.error(error);
                });

        }

In file Two.ts:

import statusRes from './one'

However, you must wait for statusRes to be retrieved from the server.

You can implement an observable design pattern to subscribe to variable changes.

For the observable design pattern, you have the option to use RXJS library or create your own implementation.

Alternatively, you can export a function in Two.ts that handles the response and import it into One.ts to call once the response is received.

In file One.ts:

import handleRes from './two'
getDealStatusInfo(dealid) {
            var statusRes
            DealApiControllers.GetDealStatus(dealid,
                (response) => {
                    statusRes = response;
                    handleRes(statusRes);
                    console.log(statusRes);
                },
                (error) => {
                    console.error(error);
                });

        }

In file Two.ts:

export function handleRes(statusRes){
  // do stuff
  console.log(statusRes);
}

Answer 2

It is important for the exported variable to be outside the function scope.

In file One.ts:

export var statusRes;
getDealStatusInfo(dealid) {
            DealApiControllers.GetDealStatus(dealid,
                (response) => {
                    statusRes = response;
                    console.log(statusRes)
                },
                (error) => {
                    console.error(error);
                });

        }

In file Two.ts:

import statusRes from './one'

However, you must wait for statusRes to be retrieved from the server.

You can implement an observable design pattern to subscribe to variable changes.

For the observable design pattern, you have the option to use RXJS library or create your own implementation.

Alternatively, you can export a function in Two.ts that handles the response and import it into One.ts to call once the response is received.

In file One.ts:

import handleRes from './two'
getDealStatusInfo(dealid) {
            var statusRes
            DealApiControllers.GetDealStatus(dealid,
                (response) => {
                    statusRes = response;
                    handleRes(statusRes);
                    console.log(statusRes);
                },
                (error) => {
                    console.error(error);
                });

        }

In file Two.ts:

export function handleRes(statusRes){
  // do stuff
  console.log(statusRes);
}

Answer 3

Answer №2

It would be beneficial to refactor the function so that it returns a promise, resolving the desired value.

export function retrieveDealStatusInfo(dealid) {
  return new Promise((resolve, reject) => {
    DealApiControllers.GetDealStatus(
      dealid,
      (response) => resolve(response),
      (error) => reject(error)
  })
}

Subsequently, on the consuming end, utilize .then or async/await...

import { retrieveDealStatusInfo } from './two'

retrieveDealStatusInfo().then((response) => { /* perform tasks*/ })

If another component is responsible for invoking retrieveDealStatusInfo, you can export an observable at the top level which gets updated by retrieveDealStatusInfo, and then subscribe to these changes.

export const statusResponse = ko.observable()

function retrieveDealStatusInfo(dealId) {
  DealApiControllers.GetDealStatus(
    dealId,
    (res) => statusResponse(res),
    (err) => console.error(err)
  )
}

import { statusResponse } from './two'

statusResponse() // current value

statusResponse.subscribe((res) => {
  // handle updates
})

Answer 4

It would be beneficial to refactor the function so that it returns a promise, resolving the desired value.

export function retrieveDealStatusInfo(dealid) {
  return new Promise((resolve, reject) => {
    DealApiControllers.GetDealStatus(
      dealid,
      (response) => resolve(response),
      (error) => reject(error)
  })
}

Subsequently, on the consuming end, utilize .then or async/await...

import { retrieveDealStatusInfo } from './two'

retrieveDealStatusInfo().then((response) => { /* perform tasks*/ })

If another component is responsible for invoking retrieveDealStatusInfo, you can export an observable at the top level which gets updated by retrieveDealStatusInfo, and then subscribe to these changes.

export const statusResponse = ko.observable()

function retrieveDealStatusInfo(dealId) {
  DealApiControllers.GetDealStatus(
    dealId,
    (res) => statusResponse(res),
    (err) => console.error(err)
  )
}

import { statusResponse } from './two'

statusResponse() // current value

statusResponse.subscribe((res) => {
  // handle updates
})

Tips for accessing an item from a separate TypeScript document (knockout.js)

Answer №1

Answer №2

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