I'm new to an Angular-based UI project, and used vscode to generate two new components for use on the project. However, I keep getting errors whenever I push my changes to git(bitbucket) and these errors are not present when I build the project on my machine. Where do I need to provide HttpClient/HttpClientModule so that these new components can use HttpHandler?
I've added providers for HttpClientModule and HttpClient on both app.module.ts and the new components themselves.
modal-wiped-all.component.ts
import { Component, OnInit } from '@angular/core';
import { NgbActiveModal, NgbModal } from '@ng-bootstrap/ng-bootstrap';
import { Router } from '@angular/router';
import { OrganisationsApiService } from 'src/app/api/organisations/organisations-api.service';
import { HttpClient, HttpClientModule, HttpHandler } from '@angular/common/http';
@Component({
selector: 'app-modal-wipedall',
templateUrl: './modal-wiped-all.component.html',
providers: [NgbActiveModal,
OrganisationsApiService,
HttpClientModule,
HttpClient,
]})
cleanup.component.ts
import { Component, OnInit } from '@angular/core';
import { HttpClient, HttpClientModule, HttpHandler } from '@angular/common/http';
import { OrganisationsApiService } from 'src/app/api/organisations/organisations-api.service';
import { NgbModal } from '@ng-bootstrap/ng-bootstrap';
import { ModalWipedAllComponent } from '../modal/modal-wiped-all/modal-wiped-all.component';
@Component({
selector: 'app-cleanup',
templateUrl: './cleanup.component.html',
styleUrls: ['./cleanup.component.css'],
providers: [OrganisationsApiService,
NgbModal,
HttpClientModule,
HttpClient,
]
})
export class CleanupComponent implements OnInit {
submitted: boolean;
loading: boolean;
deleted: number;
constructor(
private http: HttpClient,
private api: OrganisationsApiService,
private modalService: NgbModal) {
}
app.module.ts providers
providers: [AwsApiService,
OrganisationsApiService,
LabsApiService,
UsersApiService,
UserManagementDataService,
ConfigDataService,
ErrorDataService,
DeploymentResponseDataService,
ModalOptionsComponent,
ModalConfigurationComponent,
ModalUndeployLabComponent,
ModalCreatedUserComponent,
NgbActiveModal,
HttpClientModule,
HttpClient,
{ provide: HTTP_INTERCEPTORS,
useClass: HttpRequestInterceptor,
multi: true}
],
error messages:
CleanupComponent.CleanupComponent should createChrome 56.0.2924 (Linux 0.0.0)
<1s
Error: StaticInjectorError(DynamicTestModule)[HttpClient -> HttpHandler]:
StaticInjectorError(Platform: core)[HttpClient -> HttpHandler]:
NullInjectorError: No provider for HttpHandler!
at NullInjector.push../node_modules/@angular/core/fesm5/core.js.NullInjector.get node_modules/@angular/core/fesm5/core.js:1062:1)
at resolveToken node_modules/@angular/core/fesm5/core.js:1300:1)
at tryResolveToken node_modules/@angular/core/fesm5/core.js:1244:1)
at StaticInjector.push../node_modules/@angular/core/fesm5/core.js.StaticInjector.get node_modules/@angular/core/fesm5/core.js:1141:1)
at resolveToken node_modules/@angular/core/fesm5/core.js:1300:1)
at tryResolveToken node_modules/@angular/core/fesm5/core.js:1244:1)
at StaticInjector.push../node_modules/@angular/core/fesm5/core.js.StaticInjector.get node_modules/@angular/core/fesm5/core.js:1141:1)
at resolveNgModuleDep node_modules/@angular/core/fesm5/core.js:8369:1)
at NgModuleRef_.push../node_modules/@angular/core/fesm5/core.js.NgModuleRef_.get node_modules/@angular/core/fesm5/core.js:9057:1)
at resolveDep node_modules/@angular/core/fesm5/core.js:9422:1)
ModalWipedAllComponent.ModalWipedAllComponent should createChrome 56.0.2924 (Linux 0.0.0)
<1s
Error: StaticInjectorError(DynamicTestModule)[HttpClient -> HttpHandler]:
StaticInjectorError(Platform: core)[HttpClient -> HttpHandler]:
NullInjectorError: No provider for HttpHandler!
at NullInjector.push../node_modules/@angular/core/fesm5/core.js.NullInjector.get node_modules/@angular/core/fesm5/core.js:1062:1)
at resolveToken node_modules/@angular/core/fesm5/core.js:1300:1)
at tryResolveToken node_modules/@angular/core/fesm5/core.js:1244:1)
at StaticInjector.push../node_modules/@angular/core/fesm5/core.js.StaticInjector.get node_modules/@angular/core/fesm5/core.js:1141:1)
at resolveToken node_modules/@angular/core/fesm5/core.js:1300:1)
at tryResolveToken node_modules/@angular/core/fesm5/core.js:1244:1)
at StaticInjector.push../node_modules/@angular/core/fesm5/core.js.StaticInjector.get node_modules/@angular/core/fesm5/core.js:1141:1)
at resolveNgModuleDep node_modules/@angular/core/fesm5/core.js:8369:1)
at NgModuleRef_.push../node_modules/@angular/core/fesm5/core.js.NgModuleRef_.get node_modules/@angular/core/fesm5/core.js:9057:1)
at resolveDep node_modules/@angular/core/fesm5/core.js:9422:1)
I expect the project to build as it does locally, I instead get NullInjectorErrors
UPDATE: component.spec.ts files ModalWipedAll
import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { ModalWipedAllComponent } from './modal-wiped-all.component';
describe('ModalWipedAllComponent', () => {
let component: ModalWipedAllComponent;
let fixture: ComponentFixture<ModalWipedAllComponent>;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [ ModalWipedAllComponent ]
})
.compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(ModalWipedAllComponent);
component = fixture.componentInstance;
fixture.detectChanges();
});
it('should create', () => {
expect(component).toBeTruthy();
});
});
CleanupComponent
import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { CleanupComponent } from './cleanup.component';
describe('CleanupComponent', () => {
let component: CleanupComponent;
let fixture: ComponentFixture<CleanupComponent>;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [ CleanupComponent ]
})
.compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(CleanupComponent);
component = fixture.componentInstance;
fixture.detectChanges();
});
it('should create', () => {
expect(component).toBeTruthy();
});
});
There are few steps to achieve this -
in your app.module.ts import HttpClientModule
like below
import { HttpClientModule } from '@angular/common/http';
and use it the imports
array of @NgModule
like below .
@NgModule({
...
imports : [BrowserModule,HttpClientModule],
providers: [.... other services ..]
})
HttpClientModule should be added after BrowserModule. This order is important in imports
array.
Remove all the imports of HttpClientModule
from the components . If you are importing it at the root module then it's sufficient.
Remove HttpClient
from the providers
array of @NgModule
in the app.module.ts, it's not required . You can directly inject the instance of HttpClient in the constructor of component without adding it in providers.
if you are using ng-bootstrap
then you only need to import it like below in your app.module.ts -
import {NgbModule} from '@ng-bootstrap/ng-bootstrap';
and then use it like below
@NgModule({
...
imports : [BrowserModule,HttpClientModule,NgbModule.forRoot()],
providers: [.... other services ..]
})
NgbActiveModal
is not required to be added in providers.
Update : You also need to import the HttpClientModule
module in your spec file for unit testing. Testbed creates a test module for testing your component. As you have injected OrganisationsApiService in the constructor of the component, you need to add it to the providers
array of the testbed module like below .
here is the code for the spec file of CleanupComponent
-
import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { HttpClientModule } from '@angular/common/http';
import { CleanupComponent } from './cleanup.component';
import { OrganisationsApiService } from 'src/app/api/organisations/organisations-api.service';
describe('CleanupComponent', () => {
let component: CleanupComponent;
let fixture: ComponentFixture<CleanupComponent>;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [ CleanupComponent ],
imports : [HttpClientModule],
providers : [OrganisationsApiService ]
})
.compileComponents();
}));
beforeEach(() => {
fixture = TestBed.createComponent(CleanupComponent);
component = fixture.componentInstance;
fixture.detectChanges();
});
it('should create', () => {
expect(component).toBeTruthy();
});
});
Similarly you need to do the change for the other spec file for ModalWipedAll
If you are using unit testing by ng test using Jasmine and Karma, then you may need to import HttpClientTestingModule in the spec file.
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