Mastering the art of error handling is essential in Angular2, much like using try-catch blocks in C

Question

Mastering the art of error handling is essential in Angular2, much like using try-catch blocks in C

Can someone help me with posting all types of runtime errors to the server? I've been searching for a solution, but haven't found what I need. Below is my code:

       ngOnInit()
       {  
          try{
               this.CallGetBreakingNews();
              }
           catch(e)
              {
            console.log(e);
               }
        }


       CallGetBreakingNews() {
           this._service.GetBreakingNews().subscribe(
         res => {
           this._brNews = res;
           let _list: Array<BreakingNews> = [];
            for (let i = 0; i < this._brNews.length; i++) {
             _list.push({
               id: this._brNews[i].id,
               name: this._brNews[i].name
              });
          }
                this._brNews = _list;
        });
      }

I realize that in the CallGetBreakingNews method, the condition should be i<this._brNews.length. Why doesn't it go to catch as expected?

Your guidance is much appreciated. Thank you.

angular typescript

Answer 1

Answer №1

If you want to create a personalized error handler class for your application, you can do so by following these steps:

Here is an example implementation in main.ts file:

import { ErrorHandler, Injectable} from '@angular/core';
import { NgModule, ApplicationRef, ErrorHandler } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';

@Injectable()
export class CustomErrorHandler implements ErrorHandler {
  constructor() { }
  handleError(err) {
     // Add your own custom logic here
     throw err;
  }  
}

@NgModule({
  declarations: [AppComponent],
  imports: [BrowserModule],
  bootstrap: [AppComponent],
  providers: [
    {
      provide: ErrorHandler, 
      useClass: CustomErrorHandler 
    }
  ]
})

export class AppModule { }

Answer 2

If you want to create a personalized error handler class for your application, you can do so by following these steps:

Here is an example implementation in main.ts file:

import { ErrorHandler, Injectable} from '@angular/core';
import { NgModule, ApplicationRef, ErrorHandler } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent } from './app.component';

@Injectable()
export class CustomErrorHandler implements ErrorHandler {
  constructor() { }
  handleError(err) {
     // Add your own custom logic here
     throw err;
  }  
}

@NgModule({
  declarations: [AppComponent],
  imports: [BrowserModule],
  bootstrap: [AppComponent],
  providers: [
    {
      provide: ErrorHandler, 
      useClass: CustomErrorHandler 
    }
  ]
})

export class AppModule { }

Answer 3

Answer №2

Attempting to execute a block of code that may throw an error is done using the try statement in JavaScript:

<pre>
try {
    // Block of code to try
}
catch(err) {
    // Block of code to handle errors
} 
finally {
    // Block of code to be executed regardless of the try/catch result
}</pre>

This basic JS try/catch functionality remains consistent when working with angular as well.

Answer 4

Attempting to execute a block of code that may throw an error is done using the try statement in JavaScript:

<pre>
try {
    // Block of code to try
}
catch(err) {
    // Block of code to handle errors
} 
finally {
    // Block of code to be executed regardless of the try/catch result
}</pre>

This basic JS try/catch functionality remains consistent when working with angular as well.

Mastering the art of error handling is essential in Angular2, much like using try-catch blocks in C

Answer №1

Answer №2

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