In angular2 the exceptions are logged in the console by default. I heard that we can inherit the Angular ExceptionHandler and create our own exception handler so that we can override the default behavior. I tried to do it but didn't work. Can anyone help me on this with an example. Thanks in advance ....
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look at this stackoverflow.com/questions/32980405/…Gustavo– Gustavo2015-10-09 17:12:45 +00:00Commented Oct 9, 2015 at 17:12
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3 Answers
As of version 2.0.1, the current way of creating a custom error handler is the ErrorHandler interface found in @angular/core.
From the docs:
https://angular.io/docs/ts/latest/api/core/index/ErrorHandler-class.html
import { NgModule, ErrorHandler } from '@angular/core';
class MyErrorHandler implements ErrorHandler {
handleError(error) {
// do something with the exception
}
}
@NgModule({
providers: [{ provide: ErrorHandler, useClass: MyErrorHandler }]
})
class MyModule {}
When applying this on the root module, all children modules will receive the same error handler (unless they have another one specified in their provider list).
1 Comment
R.Anandan
where i add this myErrorHandler class?
It looks like you need to create your own class to handle exceptions, and then bind it in your app at bootstrap time, something like this:
import {provide, ExceptionHandler} from '@angular/core';
class MyExceptionHandler implements ExceptionHandler {
call(error, stackTrace = null, reason = null) {
// do something with the exception
}
}
And then at bootstrap time, bind this new implementation as the ExceptionHandler:
bootstrap(MyApp,
[provide(ExceptionHandler, {useClass: MyExceptionHandler})])
See here for reference.
Günter Zöchbauer
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answered Sep 10, 2015 at 19:53
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4 Comments
alexpods
And there is only one little problem: how are you going to get ExceptionHandler?)
Vinz and Tonz
I tried to add the custom exception handler but didn't work . Anyone has a working example ?
Vinz and Tonz
I am getting an exception when i tried with custom exception handler - "Cannot resolve all parameters for MyExceptionHandler(?, Boolean). Make sure they all have valid type or annotations."
Adam Szmyd
Right now i believe
provide method is deprecated. This should also work: {provide: ExceptionHandler, useClass: MyExceptionHandler}Here's an exception handler that works in alpha .46
import {ExceptionHandler} from 'angular2/angular2';
export class ERISExceptionHandler extends ExceptionHandler {
call(error, stackTrace = null, reason = null) {
alert('error:' + error + ' stackTrace: ' + stackTrace + ' reason: ' + reason);
}
}
1 Comment
asido
Except that it will bomb trying to
super.call(error, stackTrace, reason). It would be great to keep the nice angular error messages going with a custom exception handler.