[英]Angular 6 service injection exception
兩天前我開始角度,我試圖創建一個服務,將在我的春季啟動休息終點上做一個獲取請求,我希望在我的角度應用程序中顯示結果
這是我到現在為止所嘗試的
我的服務:
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { ITweet } from './itweet';
import { Observable } from 'rxjs';
@Injectable({
providedIn: 'root'
})
export class ReactiveTwitterService {
constructor(private http_client: HttpClient, private tweetTag: string) { }
spring_webflux_service_url = 'http://localhost:8081/search';
myTweets: Observable<ITweet[]>;
setTweetTag(tag) {
this.tweetTag = tag;
}
seearchTweets() {
this.myTweets = this.http_client.get<ITweet[]>(this.spring_webflux_service_url + '/' + this.tweetTag);
}
getTweets() {
return this.myTweets;
}
}
如你所見,我等待推文作為回應,所以這是我的推文界面
export interface ITweet {
id: {
text: string,
name: string
};
tag: string;
}
我的app模塊看起來像這樣
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import {HttpClientModule} from '@angular/common/http';
import { FormsModule } from '@angular/forms';
import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { SerachBarComponent } from './serach-bar/serach-bar.component';
import { SearchReasultComponent } from './search-reasult/search-reasult.component';
import { HeaderComponent } from './header/header.component';
import { ResultItemComponent } from './result-item/result-item.component';
@NgModule({
declarations: [
AppComponent,
HeaderComponent,
SerachBarComponent,
SearchReasultComponent,
ResultItemComponent
],
imports: [
BrowserModule,
AppRoutingModule,
HttpClientModule,
FormsModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
我用谷歌搜索,由於服務實現中的providedIn指令 ,不需要在提供程序中設置我的服務
我使用此服務的組件
import { Component, HostListener } from '@angular/core';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
innerWidth: number;
styleClass = {
wide_screen: 'w3-light-grey',
break_point: 'w3-dark-grey'
};
@HostListener('window:resize', ['$event'])
onResize(event) {
this.innerWidth = window.innerWidth;
}
getStyle() {
return (innerWidth > 769) ? this.styleClass.wide_screen : this.styleClass.break_point;
}
}
和
import { Component, OnInit, HostListener } from '@angular/core';
import { ReactiveTwitterService } from '../reactive-twitter.service';
@Component({
selector: 'app-serach-bar',
templateUrl: './serach-bar.component.html',
styleUrls: ['./serach-bar.component.css']
})
export class SerachBarComponent implements OnInit {
innerWidth: number;
constructor(private twiterService: ReactiveTwitterService) { }
placeholder = 'search';
styleClass = {
wide_screen: 'w3-input w3-light-grey',
break_point: 'w3-input w3-white'
};
doSearch(tag) {
this.twiterService.setTweetTag(tag);
this.twiterService.seearchTweets();
}
ngOnInit() {
}
@HostListener('window:resize', ['$event'])
onResize(event) {
this.innerWidth = window.innerWidth;
}
getStyle() {
return (innerWidth > 769) ? this.styleClass.wide_screen : this.styleClass.break_point;
}
}
和
import { Component, OnInit, HostListener } from '@angular/core';
import { ReactiveTwitterService } from '../reactive-twitter.service';
import { ITweet } from '../itweet';
@Component({
selector: 'app-search-reasult',
templateUrl: './search-reasult.component.html',
styleUrls: ['./search-reasult.component.css']
})
export class SearchReasultComponent implements OnInit {
search_result: ITweet[];
innerWidth: number;
constructor(private _twitterService: ReactiveTwitterService) { }
styleClass = {
wide_screen: 'w3-ul w3-hoverable',
break_point: 'w3-green w3-container'
};
ngOnInit() {
this._twitterService.getTweets().subscribe(tweet => this.search_result = tweet);
}
is_search_result_empty() {
return this.search_result === [];
}
set_search_result_empty() {
this.search_result = [];
}
@HostListener('window:resize', ['$event'])
onResize(event) {
this.innerWidth = window.innerWidth;
}
get_list_style() {
return (innerWidth > 769) ? this.styleClass.wide_screen : this.styleClass.break_point;
}
}
我的模板是
AppComponent
<div class="{{getStyle()}}" style="width: 100%;height: 100%;">
<app-header></app-header>
<app-serach-bar></app-serach-bar>
<app-search-reasult></app-search-reasult>
</div>
搜索欄
<div class="w3-container w3-margin-top">
<input class="{{getStyle()}}" type="text" placeholder="{{placeholder}}" (onclick.enter)="doSearch(searchinput.value)" #searchinput>
</div>
搜索結果
<div class="w3-container" *ngIf="!is_search_result_empty">
<ul class="{{get_list_style()}}">
<app-result-item *ngFor="let current_item of search_result; trackBy:current_item.id" [item]="current_item"></app-result-item>
</ul>
</div>
控制台記錄異常,一切都是空白的
我該怎么做才能解決這個問題?
你需要將服務添加到模塊中的提供者當然記得導入服務
@NgModule({
declarations: [
AppComponent,
HeaderComponent,
SerachBarComponent,
SearchReasultComponent,
ResultItemComponent
],
imports: [
BrowserModule,
AppRoutingModule,
HttpClientModule,
FormsModule
],
providers: [
ReactiveTwitterService
],
bootstrap: [AppComponent]
})
在您的代碼constructor(private _twitterService: ReactiveTwitterService) { }
中無法初始化private tweetTag: string
因此它仍然失敗,並且@Injectable({ providedIn: 'root' })
與providers: [ReactiveTwitterService]
行為不同providers: [ReactiveTwitterService]
您的服務應作為提供商提供給您的組件或模塊。 您可以將它添加到providers:
appmodule中的數組或單個模塊,並將其注入組件以供使用。
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