Angular gives error when trying to handle errors that come from API calls-CodePudding

The

Console log

I read same questions and still didn't get a solution.

CodePudding user response：

This is what You suppose to pay more attention to You provided 'undefined' where a stream was expected

Which means exactly what it states. You did not provide any data to the service and than to the endpoint.

You have to check if in every step the data is passed correctly to another step, i.e. from component to service, from service to endpoint.

CodePudding user response：

When serve returns error response, you need to handle it in error callback method.

this.maintenanceService.getCurrentStatus(this.Id, fromDateToRest, toDateToRest).subscribe( (currentStatus) => { if (currentStatus && currentStatus.length > 0) { //do something } else if (currentStatus && currentStatus.length === 0) { this.errorMessage = "No data!" } else if(currentStatus && currentStatus.status === 500) { this.errorMessage = current status.error } }, (error) => { console.log(error); // check error status code, if it is 500, then do some actions like you needed below if (error.status === 500) { this.errorMessage = "Internal Server Error!" } } );