Pas de fournisseur pour HttpClient

Question

Après la mise à jour d'angular 4.4 vers 5.0 et après avoir mis à jour tous les HttpModule et Http vers HttpClientModule, j'ai commencé à obtenir cette erreur.

J'ai également ajouté HttpModule à nouveau pour être sûr que ce n'est pas dû à une dépendance, mais cela ne résout pas le problème.

Dans le module de l'application, tout est correctement configuré.

    import { HttpModule } from '@angular/http';
    import { HttpClientModule, HttpClient } from '@angular/common/http';
    .
    .
    .
    @NgModule({
        imports: [
            BrowserModule,
            HttpClientModule,
            HttpModule,
            BrowserAnimationsModule,
            FormsModule,
            AppRoutingModule,
    .
    .
    .

Je ne sais pas d'où vient cette erreur, ou je n'ai aucune idée de la façon de la supprimer. J'ai aussi un message d'avertissement (que je mets aussi ci-dessous) qui est peut-être lié.

    Error: StaticInjectorError[HttpClient]: 
      StaticInjectorError[HttpClient]: 
        NullInjectorError: No provider for HttpClient!
        at _NullInjector.get (vendor.js?v=mekBM8IVBK72-MIZOVSTJizGi_TD_xK3uhPOCRlEHwg:5665)
        at resolveToken (vendor.js?v=mekBM8IVBK72-MIZOVSTJizGi_TD_xK3uhPOCRlEHwg:5953)
        at tryResolveToken (vendor.js?v=mekBM8IVBK72-MIZOVSTJizGi_TD_xK3uhPOCRlEHwg:5895)
        at StaticInjector.get (vendor.js?v=mekBM8IVBK72-MIZOVSTJizGi_TD_xK3uhPOCRlEHwg:5766)
        at resolveToken (vendor.js?v=mekBM8IVBK72-MIZOVSTJizGi_TD_xK3uhPOCRlEHwg:5953)
        at tryResolveToken (vendor.js?v=mekBM8IVBK72-MIZOVSTJizGi_TD_xK3uhPOCRlEHwg:5895)
        at StaticInjector.get (vendor.js?v=mekBM8IVBK72-MIZOVSTJizGi_TD_xK3uhPOCRlEHwg:5766)
        at resolveNgModuleDep (vendor.js?v=mekBM8IVBK72-MIZOVSTJizGi_TD_xK3uhPOCRlEHwg:15328)
        at _createClass (vendor.js?v=mekBM8IVBK72-MIZOVSTJizGi_TD_xK3uhPOCRlEHwg:15373)
        at _createProviderInstance$1 (vendor.js?v=mekBM8IVBK72-MIZOVSTJizGi_TD_xK3uhPOCRlEHwg:15339)

Message d'avertissement :

    ./node_modules/@angular/Common/esm5/http.js
    There are multiple modules with names that only differ in casing.
    This can lead to unexpected behavior when compiling on a filesystem with other case-semantic.
    Use equal casing. Compare these module identifiers:
    * D:\XXX\node_modules\@angular\Common\esm5\http.js
        Used by 21 module(s), i. e.
        D:\XXX\node_modules\awesome-typescript-loader\dist\entry.js?silent=true!D:\XXX\node_modules\angular2-template-loader\index.js!D:\XXX\ClientApp\app\services\notification-endpoint.service.ts
    * D:\XXX\node_modules\@angular\common\esm5\http.js
        Used by 1 module(s), i. e.
        D:\XXX\node_modules\awesome-typescript-loader\dist\entry.js?silent=true!D:\XXX\node_modules\angular2-template-loader\index.js!D:\XXX\ClientApp\app\app.module.ts
     @ ./node_modules/@angular/Common/esm5/http.js
     @ ./ClientApp/app/services/notification-endpoint.service.ts
     @ ./ClientApp/app/app.module.ts
     @ ./ClientApp/boot.browser.ts
     @ multi event-source-polyfill webpack-hot-middleware/client?path=__webpack_hmr&dynamicPublicPath=true ./ClientApp/boot.browser.ts

Comportement actuel

StaticInjectorError[HttpClient]: StaticInjectorError[HttpClient]: NullInjectorError: No provider for HttpClient!

Environnement

Angular version: 5.0.0 and 5.0.1 (also 5.1 beta)

Browser:
- all

For Tooling issues:
- Node version: 8.5.0
- Platform:  windows

    {
      "name": "X",
      "version": "1.0.0",
      "description": "X",
      "author": {
        "name": "X X",
        "email": "XX",
        "url": "X"
      },
      "homepage": "X",
      "dependencies": {
        "@angular/animations": "^5.1.0-beta.0",
        "@angular/common": "^5.1.0-beta.0",
        "@angular/compiler": "^5.1.0-beta.0",
        "@angular/compiler-cli": "^5.1.0-beta.0",
        "@angular/core": "^5.1.0-beta.0",
        "@angular/forms": "^5.1.0-beta.0",
        "@angular/http": "^5.1.0-beta.0",
        "@angular/platform-browser": "^5.1.0-beta.0",
        "@angular/platform-browser-dynamic": "^5.1.0-beta.0",
        "@angular/platform-server": "^5.1.0-beta.0",
        "@angular/router": "^5.1.0-beta.0",
        "@ngtools/webpack": "^1.8.0",
        "@ngx-translate/core": "^8.0.0",
        "@ngx-translate/http-loader": "^2.0.0",
        "@swimlane/ngx-datatable": "^11.0.3",
        "@types/jquery": "^3.2.16",
        "@types/webpack-env": "^1.13.2",
        "angular2-template-loader": "^0.6.2",
        "aspnet-webpack": "^2.0.1",
        "awesome-typescript-loader": "^3.3.0",
        "bootstrap": "^3.3.7",
        "bootstrap-datepicker": "^1.7.1",
        "bootstrap-select": "^1.12.4",
        "bootstrap-toggle": "^2.2.2",
        "bootstrap-vertical-tabs": "^1.2.2",
        "chart.js": "^2.7.1",
        "core-js": "^2.5.1",
        "css": "^2.2.1",
        "css-loader": "^0.28.7",
        "event-source-polyfill": "^0.0.11",
        "expose-loader": "^0.7.3",
        "extract-text-webpack-plugin": "^3.0.2",
        "file-loader": "^1.1.5",
        "font-awesome": "^4.7.0",
        "html-loader": "^0.5.1",
        "jquery": "^3.2.1",
        "json-loader": "^0.5.7",
        "ng2-charts": "^1.6.0",
        "ng2-toasty": "^4.0.3",
        "ngx-bootstrap": "^2.0.0-beta.8",
        "node-sass": "^4.6.0",
        "popper.js": "^1.12.6",
        "raw-loader": "^0.5.1",
        "rxjs": "^5.5.2",
        "sass-loader": "^6.0.6",
        "style-loader": "^0.19.0",
        "to-string-loader": "^1.1.5",
        "typescript": "^2.6.1",
        "url-loader": "^0.6.2",
        "web-animations-js": "^2.3.1",
        "webpack": "^3.8.1",
        "webpack-hot-middleware": "^2.20.0",
        "webpack-merge": "^4.1.1",
        "zone.js": "^0.8.18"
      },
      "devDependencies": {
        "@types/chai": "^4.0.4",
        "@types/jasmine": "^2.6.3",
        "chai": "^4.1.2",
        "jasmine-core": "^2.8.0",
        "karma": "^1.7.1",
        "karma-chai": "^0.1.0",
        "karma-chrome-launcher": "^2.2.0",
        "karma-cli": "^1.0.1",
        "karma-jasmine": "^1.1.0",
        "karma-jasmine-html-reporter": "^0.2.2",
        "karma-webpack": "^2.0.5"
      },
      "scripts": {
        "dev-build": "node node_modules/webpack/bin/webpack.js --config webpack.config.vendor.js",
        "test": "karma start ClientApp/test/karma.conf.js"
      }
    }

webpack.config.js

    const path = require('path');
    const webpack = require('webpack');
    const merge = require('webpack-merge');
    const AotPlugin = require('@ngtools/webpack').AotPlugin;
    const CheckerPlugin = require('awesome-typescript-loader').CheckerPlugin;

    module.exports = (env) => {
        // Configuration in common to both client-side and server-side bundles
        const isDevBuild = !(env && env.prod);
        const sharedConfig = {
            stats: { modules: false },
            context: __dirname,
            resolve: { extensions: ['.js', '.ts'] },
            output: {
                filename: '[name].js',
                publicPath: 'dist/' // Webpack dev middleware, if enabled, handles requests for this URL prefix
            },
            module: {
                rules: [
                    { test: /\.ts$/, use: isDevBuild ? ['awesome-typescript-loader?silent=true', 'angular2-template-loader'] : '@ngtools/webpack' },
                    { test: /\.html$/, use: 'html-loader?minimize=false' },
                    { test: /\.css$/, use: ['to-string-loader', isDevBuild ? 'css-loader' : 'css-loader?minimize'] },
                    { test: /\.scss$/, use: ['to-string-loader', isDevBuild ? 'css-loader' : 'css-loader?minimize', 'sass-loader'] },
                    { test: /\.(png|jpg|jpeg|gif|svg)$/, use: 'url-loader?limit=25000' }
                ]
            },
            plugins: [new CheckerPlugin()]
        };

        // Configuration for client-side bundle suitable for running in browsers
        const clientBundleOutputDir = './wwwroot/dist';
        const clientBundleConfig = merge(sharedConfig, {
            entry: { 'main-client': './ClientApp/boot.browser.ts' },
            output: { path: path.join(__dirname, clientBundleOutputDir) },
            plugins: [
                new webpack.DllReferencePlugin({
                    context: __dirname,
                    manifest: require('./wwwroot/dist/vendor-manifest.json')
                })
            ].concat(isDevBuild ? [
                // Plugins that apply in development builds only
                new webpack.SourceMapDevToolPlugin({
                    filename: '[file].map', // Remove this line if you prefer inline source maps
                    moduleFilenameTemplate: path.relative(clientBundleOutputDir, '[resourcePath]') // Point sourcemap entries to the original file locations on disk
                })
            ] : [
                    // Plugins that apply in production builds only
                    new webpack.optimize.UglifyJsPlugin(),
                    new AotPlugin({
                        tsConfigPath: './tsconfig.json',
                        entryModule: path.join(__dirname, 'ClientApp/app/app.module#AppModule')
                    })
                ])
        });

        return [clientBundleConfig];
    };

webpack.config.vendor.js

    const path = require('path');
    const webpack = require('webpack');
    const ExtractTextPlugin = require('extract-text-webpack-plugin');
    const merge = require('webpack-merge');
    const treeShakableModules = [
        '@angular/animations',
        '@angular/common',
        '@angular/compiler',
        '@angular/core',
        '@angular/forms',
        '@angular/http',
        '@angular/platform-browser',
        '@angular/platform-browser-dynamic',
        '@angular/router',
        'zone.js',
    ];
    const nonTreeShakableModules = [
        'bootstrap',
        'core-js/client/shim',
        'web-animations-js',
        'event-source-polyfill',
        'jquery',
        '@swimlane/ngx-datatable/release/assets/icons.css',
        'ng2-toasty',
        'ng2-toasty/bundles/style-bootstrap.css',
        'ng2-charts',
        'ngx-bootstrap/modal',
        'ngx-bootstrap/tooltip',
        'ngx-bootstrap/popover',
        'ngx-bootstrap/dropdown',
        'ngx-bootstrap/carousel',
        'bootstrap-vertical-tabs/bootstrap.vertical-tabs.css',
        'bootstrap-toggle/css/bootstrap-toggle.css',
        'bootstrap-toggle/js/bootstrap-toggle.js',
        'bootstrap-select/dist/css/bootstrap-select.css',
        'bootstrap-select/dist/js/bootstrap-select.js',
        'bootstrap-datepicker/dist/css/bootstrap-datepicker3.css',
        'font-awesome/css/font-awesome.css'
    ];
    const allModules = treeShakableModules.concat(nonTreeShakableModules);

    module.exports = (env) => {
        const extractCSS = new ExtractTextPlugin('vendor.css');
        const isDevBuild = !(env && env.prod);
        const sharedConfig = {
            stats: { modules: false },
            resolve: { extensions: ['.js'] },
            module: {
                rules: [
                    { test: /\.(gif|png|woff|woff2|eot|ttf|svg)(\?|$)/, use: 'url-loader?limit=100000' }
                ]
            },
            output: {
                publicPath: 'dist/',
                filename: '[name].js',
                library: '[name]_[hash]'
            },
            plugins: [
                new webpack.ProvidePlugin({ $: 'jquery', jQuery: 'jquery' }), // Maps these identifiers to the jQuery package (because Bootstrap expects it to be a global variable)
                new webpack.ContextReplacementPlugin(/\@angular\b.*\b(bundles|linker)/, path.join(__dirname, './ClientApp')), // Workaround for https://github.com/angular/angular/issues/11580
                new webpack.ContextReplacementPlugin(/angular(\\|\/)core(\\|\/)@angular/, path.join(__dirname, './ClientApp')), // Workaround for https://github.com/angular/angular/issues/14898
                new webpack.IgnorePlugin(/^vertx$/) // Workaround for https://github.com/stefanpenner/es6-promise/issues/100
            ]
        };

        const clientBundleConfig = merge(sharedConfig, {
            entry: {
                // To keep development builds fast, include all vendor dependencies in the vendor bundle.
                // But for production builds, leave the tree-shakable ones out so the AOT compiler can produce a smaller bundle.
                vendor: isDevBuild ? allModules : nonTreeShakableModules
            },
            output: { path: path.join(__dirname, 'wwwroot', 'dist') },
            module: {
                rules: [
                    { test: /\.css(\?|$)/, use: extractCSS.extract({ use: isDevBuild ? 'css-loader' : 'css-loader?minimize' }) }
                ]
            },
            plugins: [
                extractCSS,
                new webpack.DllPlugin({
                    path: path.join(__dirname, 'wwwroot', 'dist', '[name]-manifest.json'),
                    name: '[name]_[hash]'
                })
            ].concat(isDevBuild ? [] : [
                new webpack.optimize.UglifyJsPlugin()
            ])
        });

        return [clientBundleConfig];
    }

Answer 1

Pour résoudre ce problème HttpClient est le mécanisme d'Angular pour communiquer avec un serveur distant via HTTP.

Pour faire HttpClient disponible partout dans l'application,

1. ouvrir la racine AppModule ,

2. d'importer le HttpClientModule de @angular/common/http ,

3. l'ajouter à la @NgModule.imports le tableau.

Ajoutez ce qui suit à app.module.ts :

import { HttpClientModule } from '@angular/common/http'; 

Après cela, ajoutez dans la section d'importation comme imports:[HttpClientModule, ]

Answer 2

Vous n'avez pas fourni de fournisseurs dans votre module :

<strike>import { HttpModule } from '@angular/http';</strike>
import { HttpClientModule, HttpClient } from '@angular/common/http';

@NgModule({
  imports: [
    BrowserModule,
    HttpClientModule,
    BrowserAnimationsModule,
    FormsModule,
    AppRoutingModule
  ],
  providers: [ HttpClientModule, ... ]
  // ...
})
export class MyModule { /* ... */ }

Utilisation de HttpClient dans les tests

Vous devrez ajouter le HttpClientTestingModule à la configuration de TestBed lors de l'exécution de ng test et j'obtiens l'erreur "No provider for HttpClient" :

// Http testing module and mocking controller
import { HttpClientTestingModule, HttpTestingController } from '@angular/common/http/testing';

// Other imports
import { TestBed } from '@angular/core/testing';
import { HttpClient, HttpErrorResponse } from '@angular/common/http';

describe('HttpClient testing', () => {
  let httpClient: HttpClient;
  let httpTestingController: HttpTestingController;

  beforeEach(() => {
    TestBed.configureTestingModule({
      imports: [ HttpClientTestingModule ]
    });

    // Inject the http service and test controller for each test
    httpClient = TestBed.get(HttpClient);
    httpTestingController = TestBed.get(HttpTestingController);
  });

  it('works', () => {
  });
});

Answer 3

Vous obtenez une erreur pour HttpClient, il vous manque donc HttpClientModule pour cela.

vous devez l'importer dans le fichier app.module.ts comme ceci -

import { HttpClientModule } from '@angular/common/http';

et le mentionner dans le décorateur NgModule comme ceci -

@NgModule({
...
imports:[ HttpClientModule ]
...
})

si cela ne fonctionne pas, essayez de supprimer les cookies du navigateur et essayez de redémarrer votre serveur. J'espère que cela pourra fonctionner, j'ai eu la même erreur.

Answer 4

J'ai eu le même problème. Après avoir navigué et lutté avec le problème, j'ai trouvé la solution suivante

import { HttpModule } from '@angular/http';
import { HttpClientModule } from '@angular/common/http';

imports: [
  HttpModule,
  HttpClientModule
]

Importation HttpModule et HttpClientModule dans app.module.ts et ajouter dans les importations comme mentionné ci-dessus.

Answer 5

J'étais également confronté à un problème similaire et j'ai effectué les modifications suivantes, qui ont fonctionné pour moi.

Dans app.modules.ts

import {HttpClientModule} from '@angular/common/http' 

et dans la classe de service correspondante

import { HttpClient } from '@angular/common/http'

devrait ressembler à ce qui suit

constructor(private http: HttpClient, private xyz: xyzService) {}

Dans le fichier de test

import { HttpClientTestingModule } from '@angular/common/http/testing'

  beforeEach(() => TestBed.configureTestingModule({
    imports: [HttpClientTestingModule]
  }));