Angular Error Handler - Extracting component context information from errors

In the event of a TypeScript error, I am looking to send all of the component's attribute values to a REST API. It would greatly benefit me if I could access the component's context (this) in order to retrieve the values of all attributes within that component.

Is there a way to accomplish this? While ngDebugContext.view contains the context, it is not accessible in PROD mode.

[EDIT]

For instance, consider the following component.

export class MyComponent implements OnInit{
   constructor(service:BaseService){}

   public first = 'first'; //.................... LINE 1
   public second = ['a','b'];//.................. LINE 2

   ngOnInit(){
        let a = null;
        console.log(a.name); //................... LINE 3
   }

}

At LINE 3, a type error will occur and the error will be handled by the error handler service.

@Injectable()
export class ErrorHandlerService extends ErrorHandler {
...................
...................
     handleError(error: Error | HttpErrorResponse) {
        //I need to retrieve the values from LINE 1 & LINE 2 here..
     }
}

Upon reaching the error handler, all information about MyComponent is lost, but I need to recover it.

Answer №1

To troubleshoot in a debugging environment, consider implementing the following code snippet:

handleError(error: Error | HttpErrorResponse) {
        if(!(error instanceof HttpErrorResponse))
        {
            let component : any = error.ngDebugContext.elView? error.ngDebugContext.elView.component : null; 
            if(component instanceof MyComponent)
            {
                console.log(`Error in MyComponent: first ${component.first} second ${component.second}`);
            }
        }
     }

Keep in mind that this approach may not provide a solution in all cases, and its effectiveness may vary when applied in a production environment.

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

Is it possible to remove generic T in typescript if the mysql result value is an array but generic T is not an array?

type User = { name: string email: string } This is the code snippet, import type { PoolConnection, RowDataPacket, OkPacket } from "mysql2/promise"; type dbDefaults = RowDataPacket[] | RowDataPacket[][] | OkPacket | OkPacket[]; type dbQuery& ...

Found in the NgModule.imports section of the AppModule, yet was unable to be identified as an NgModule class in Angular version 12.2.9

Just set up a fresh angular 12 application and installed version 12 of @angular/material. Now I'm trying to implement it by adding this basic element: <mat-drawer-container></mat-drawer-container> However, all I see in the browser is a wh ...

Can you explain how to utilize prop values for setting attributes in styled-components v4 with TypeScript?

Overview Situation: const Link = styled.a` border: solid 1px black; border-radius: 5px; padding: 5px; margin: 10px 5px; `; type ButtonProps = React.ButtonHTMLAttributes<HTMLButtonElement>; const LinkAsButton = styled(Link).attrs<ButtonP ...

Mastering the process of importing AngularJS submodules in TypeScript

Currently, I am in the process of structuring an AngularJS (Angular 1) project using TypeScript. To compile TypeScript & ES6 to JavaScript, I have set up webpack. In my webpack configuration, I only compile the "app.ts" file and any other files it imports ...

Sending JSON object data to an API endpoint using the POST method in an Angular application

Attempted to post data to an API, but received a 400 bad request error. After testing with Postman, it seems that the issue may lie within my service or TypeScript code. As a newcomer to Angular, I am seeking assistance as I have searched extensively witho ...

Does the TS keyof typeof <Object> rule prohibit the assignment of object.keys(<Object>)?

I'm having trouble understanding the issue with this code snippet. Here is the piece of code in question: export type SportsTypes = keyof typeof SportsIcons export const sports: SportsTypes[] = Object.keys(SportsIcons); The problem arises when I at ...

Troubleshooting Angular 4: Dealing with a 404 Error when Trying to Fetch a JSON File using HTTP GET and

I'm currently facing an issue with my application where I have a local json file and I am trying to read it using the Http get method. However, I am getting an exception (404) on the console. I found out that when using webpack, assets/data are not av ...

Guide to creating animations with javascript/react js

My attempt at altering the opacity of an element every 100 milliseconds following a click event has not been successful. The function change is triggered by a click, yet the code does not work as intended. Here's what I have so far: function change (i ...

Managing the outcome of numerous asynchronous calls before accessing the database post-result collection

Hey everyone, I'm just getting started with node.js and I'm working on the following tasks: Calling the AWS API to create Cognito users by passing data. After all requests are completed, inserting all the records into the database. In my code, ...

Typing should be positioned on either side of the declaration

When I define the type MyType, it looks like this: export type MyType = { ID: string, Name?: string }; Now, I have the option to declare a variable named myVar using three slightly different syntaxes: By placing MyType next to the variable ...

When attempting to access Angular routes directly through a browser, they are not discoverable

After creating routes for /home, /contact, and others, I generated the dist folder using ng build --prod --base-href. I then transferred the contents of the dist folder to my hosting server via FileZilla. While navigating the website normally works fine, w ...

What is the best way to assign the value of an HTTP GET request to a subarray in Angular 8

Attempting to store data in a sub-array (nested array) but despite receiving good response data, the values are not being pushed into the subarray. Instead, an empty array is returned. for (var j=0;j<this.imagesdataarray.length;j++){ this.http.g ...

Uploading files using Angular 6 to communicate with a Flask (Python) API

I have developed a web service using Flask to save files, following the example provided in the official Flask documentation: @app.route('/parse_table', methods=['POST']) def upload_file(): print(request.files) # check if the p ...

Unable to locate the JSON file in the req.body after sending it through an HTTP post request

I have been working on implementing a new feature in my application that involves passing a JSON file from an Angular frontend to a Node backend using Express. The initial code reference can be found at How do I write a JSON object to file via Node server? ...

Develop a component library for Angular 2 without incorporating inline styles

I recently came across an interesting article about developing an Angular 2 component library that utilizes inline styles. Is there a method to create a library in Angular 2 without relying on inline styles? I also stumbled upon another resource, but it d ...

What is the best way to refer to a specific argument by implication within a function type?

Is there a way to extract the name of an argument from one type and use it in another type? For example, is it possible to achieve something like this: type F_v1 = (name: number) => boolean; type A = ["name", number]; //type F_v2 = (A[0]: A[1]) => bo ...

What is the best way to consistently position a particular row at the bottom of the table in AG-grid?

I have successfully implemented a table using AG-grid. Here is the code snippet: .HTML <ag-grid-angular #agGrid style="width: 100%; height: 100%; font-size: 12px;" class="ag-theme-alpine" [rowData]=&quo ...

The customer's status cannot be determined

I've encountered an issue with my TypeScript code that includes a simple if-else logic. endDate: String = ''; customerStatus: String; this.endDate = this.sampleData.customerStartDate; if (this.endDate == null) { this.customerStatus = ' ...

Do the two types of updater functions for setState in React hold the same value?

Recently, I came across the concept of using updater functions for setState in React. After learning about this, I noticed it being implemented in two different ways. Imagine having a state object structured like this: interface State { readonly expand ...

Are there any comparable features in Angular 8 to Angular 1's $filter('orderBy') function?

Just starting out with Angular and curious about the alternative for $filter('orderBy') that is used in an AngularJS controller. AngularJS example: $scope.itemsSorted = $filter('orderBy')($scope.newFilteredData, 'page_index&apos ...