Error in Typescript with Ionic 2 involving the MapSubscriber, lack of helpful error information

Greetings to all who come across this message. I am currently developing an app using Ionic2 where users can send image data to the server. If the server successfully receives the data, a confirmation message is displayed; otherwise, an error notification is shown.

The problem I'm facing is that despite receiving the image data in full and it displaying correctly on the server, Ionic/Typescript indicates an error when sending the data.

It is crucial for me to receive confirmation from the client that the information has been received accurately so that I can present it to the user.

Here is the relevant code snippet:

 return new Promise((resolve, reject)=>{
    this.http.get(url).map(res=>res.json()).subscribe(data=>{
        console.log('InvoiceHttp.send() success!');
        resolve(data);
    }, err=>{
        console.log('Http error on InvoiceHttp.send()');
        console.error(err);
    });
});

Upon running this function, I see both the success and error messages in the console. However, the error message points to the following:

ERROR: {"line":78889,"column":39,"sourceURL":"file:///var/containers/Bundle/Application/601C2294-78EA-48A2-9BAC-B53C04ADD458/MyApp.app/www/build/main.js"}

Investigating further, I noticed that this line leads to the MapSubscriber definition, hinting at a possible issue with .subscribe().

Initially, I considered that the server's response might not be in proper JSON format. Even after changing the response to blank or {}, the error persists, leaving me puzzled about its cause.

I appreciate any responses or insights shared on this matter.

Answer №1

I quickly realized that the mistake I made was trying to call json() on resp. It seems like Map doesn't appreciate when you try to convert an empty response into JSON.

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

updating information automatically on page every X seconds for Angular component

I am trying to implement a way to automatically refresh the data of an Angular component every 30 seconds. Currently, I have used a simple setInterval function like this: this.interval = setInterval(() => { this.refresh(); // api call ...

Highcharts3d was already defined locally, preventing the import declaration from being recognized with error code TS2440

Struggling to get my application to run in VS code due to this persistent error: error TS2440: Import declaration conflicts with local declaration of 'Highcharts3d' Any assistance in resolving this issue would be greatly appreciated. import ...

Integrating Typescript into function parameters

I am attempting to make my function flexible by allowing it to accept either a string or a custom type onPress: (value: string | CustomType)=>void But when I try to assign a string or CustomType, the compiler gives an error saying is not assignable to ...

What is the best way to handle asynchronous actions while initializing a database in Next.js?

My goal is to create tables during the database initialization stage with a structure like this: CREATE TABLE IF NOT EXISTS users ( "id" SERIAL PRIMARY KEY, "created_at" TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP, "name&quo ...

Updating the defaultLabel dynamically in primeNg multiselect: A step-by-step guide

In the PrimeNG multiselect component, I'm facing an issue where I can unselect items from the TypeScript file, but this change is not reflected in the input field. someComponent.html <p-multiSelect [options]="cities1" maxSelectedLabels=0 selected ...

Is there a way to utilize Typescript enum types for conditional type checking?

I'm working with restful services that accept enum values as either numbers or strings, but always return the values as numbers. Is there a way to handle this in TypeScript? Here's my attempt at it, although it's not syntactically correct: ...

Creating a Button with Icon and Text in TypeScript: A step-by-step guide

I attempted to create a button with both text and an icon. Initially, I tried doing it in HTML. <button> <img src="img/favicon.png" alt="Image" width="30px" height="30px" > Button Text ...

Reactive property in the Vue composition API

Within a Vue 3 project that utilizes TypeScript, there are two properties named locale and content: <script setup lang="ts"> import { computed, ref } from 'vue' import { useI18n } from "vue-i18n" import { Landing, Local ...

Activate an automatic clicking action in the ng-datepicker

Currently, I am facing a challenge while working on an Angular 2 project using Typescript. The calendar I have created is only displayed after a click event, but I would like it to appear on the page as soon as it loads without requiring any user interacti ...

What is the reason behind Flow's reluctance to infer the function type from its return value?

I was anticipating the code to undergo type checking within Flow just like it does within TypeScript: var onClick : (() => void) | (() => boolean); onClick = () => { return true; } However, I encountered this error instead: 4: onClick = () => ...

Modify the key within an array of objects that share a common key

I have an object structured as follows: NewObjName: Object { OLDCOLUMNNAME1: "NEWCOLUMN_NAME1", OLDCOLUMNNAME2: "NEWCOLUMN_NAME2", OLDCOLUMNNAME3: "NEWCOLUMN_NAME3"} Next, there is an array containing objects in this format: ...

Steps for activating the HTML select option menu with an external button click

I'm currently in the process of building a React website and I'm faced with the challenge of customizing select options to align with my design in Figma. Check out this image for reference Here's how I've set it up in my code: const C ...

Trigger an Angular2 component function from an HTML element by simply clicking a button

I'm just starting out with TypeScript and Angular2 and encountering an issue when trying to call a component function by clicking on an HTML button. When I use the **onclick="locateHotelOnMap()"** attribute on the HTML button element, I receive this ...

Is there a method for executing ng-serve alongside expressjs?

I am currently following an Angular6/Express tutorial. In the tutorial, they utilize the following scripts: "scripts": { "ng": "ng", "start": "ng build && node ./bin/www", "build": "ng build", "test": "ng test", "lint": "ng lint", "e2e ...

Learn how to send error logs from an Angular frontend to the backend using a custom API or any other method to store them in the Serilog table in MSSQL

Is there a way to log errors from an Angular frontend to a backend using a custom API or any other method that can send the data to Serilog's SQL sink table in MSSQL? My application utilizes multiple APIs from various third-party resources, and I need ...

When using Angular's npm, an underscore is added to an already existing directory within angular-devkit, resulting in a "directory not found" (ENOENT) error

Encountered an error while compiling my Angular Electron app that states Error: ENOENT: no such file or directory, open 'node_modules/@angular-devkit/build-angular/src/angular-cli-files/_models/webpack-configs/browser.js'. Despite the error messa ...

The reset() function in Angular does not set form controls to empty values

When following the Hero guide, I encountered an issue while trying to reset all fields in the model using the provided code snippet. this.form.reset({ "firstName": "", "lastName": "bzz", "reporter": "" }); The problem arises when only non-empty fi ...

Inheritance of Generic Types in TypeScript

Could someone assist me in understanding what is incorrect with the code snippet provided here? I am still learning Typescript. interface ICalcValue { readonly IsNumber: boolean; readonly IsString: boolean; } interface ICalcValue<T> ex ...

Creating a data structure that represents the key and value of a specific filter along with their corresponding data types

I'm in the process of creating a function that accepts a specific filter key with a value that corresponds to a keyof an interface I've defined. The desired outcome is to return an object where the filter value acts as one of the keys and its typ ...

The attribute 'xxx' is not found within the 'Readonly<{}>' type

I am currently in the process of writing tests for a React Typescript component. App.tsx: import * as React from 'react'; import { Button } from 'react-bootstrap'; interface Igift { id: number; } interface IAppState { gifts: Igi ...