这篇文章给大家介绍怎么在Angular5中实现状态管理,内容非常详细,感兴趣的小伙伴们可以参考借鉴,希望对大家能有所帮助。
先定义状态管理对象,需要存什么数据,自己定义
export class UserInfo {
public userInfo: boolean;
constructor(){
this.userInfo = true; //设置全局的控制导航是否显示
}
}
然后定义Service,如下
import { Injectable} from '@angular/core';
import { Headers, Http } from '@angular/http';
import { UserInfo } from './user-info.model';
@Injectable() //注入服务
export class ListsService{
private userInfo;
constructor(private http: Http) {
this.userInfo = new UserInfo();
}
//设置路由显示的状态
setUserInfo(v) {
this.userInfo.userInfo = v;
}
//获取路由显示的状态
getUserInfo() {
return this.userInfo;
}
}
配置了service一定要在ngmodule中导入,这样才能在此module中有效
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import { AppComponent } from './app.component';
import { AppRouterModule } from './router.module';
import { ViewComponent } from './view.component';
import { ListComponent } from './list.component';
import { OtherComponent } from './other.component';
import { DetailComponent } from './detail.component';
import { ListsService } from './app.service';
@NgModule({
declarations: [
AppComponent,
DetailComponent,
ViewComponent,
ListComponent,
OtherComponent
],
imports: [
BrowserModule,
FormsModule ,
AppRouterModule,
HttpModule
],
providers: [ListsService],
bootstrap: [AppComponent]
})
export class AppModule { }
然后就可以在component中使用了
@Component({
selector: 'app-root',
template: `
<div >
<div class="lists" *ngIf='userInfo.userInfo'>
<a routerLink="/view" routerLinkActive ="active">特价展示</a>
<a routerLink="/list" routerLinkActive ="active">列表展示</a>
</div>
<router-outlet></router-outlet>
</div>
`,
styles:[`
.lists a{
padding:0 10px;
}
.active{
color: #f60;
}
`]
})
export class AppComponent {
private userInfo;
constructor(private listsService: ListsService) {
this.userInfo= this.listsService.getUserInfo();
}
}
在详情页中通过改变状态来改变页面
@Component({
selector: 'app-detail',
template: `
<div>
详情页{{id}}
<button (click)="goBack()">返回</button>
</div>
`,
})
export class DetailComponent {
private userInfo;
constructor(
private route: ActivatedRoute,
private location: Location,
private listsService: ListsService
) {
this.userInfo= this.listsService.setUserInfo(false);
}
goBack(): void {
this.location.back();
}
//组件销毁时执行
ngOnDestroy():void{
this.userInfo= this.listsService.setUserInfo(true);
}
}
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