我现在正在尝试angular2。我想在视图中显示所有产品列表。我从Java Play服务器获得的产品列表。但是在我的angular2视图中,其显示错误无法绑定ngFor。 console.log以Object数组形式显示所有数据。那意味着我的角度组件可以从Java服务器获取数据。这是我的方法。
products.component.ts
import { Component, OnInit } from '@angular/core';
import { HttpModule } from '@angular/http';
import { Observable } from 'rxjs/Rx';
import { Logger } from 'angular2-logger/core';
import { ProductService } from './products.service';
import { ProductsModule } from './products.module';
@Component({
selector: 'products-cmp',
templateUrl: 'assets/app/portal/common/products/products.component.html',
providers: [ ProductService, ProductsModule ],
})
export class ProductsComponent implements OnInit {
private products: Object;
private keys: String[];
constructor(
private productService: ProductService,
) {
}
public getAllProducts() {
this.productService.getProducts()
.subscribe(
products => {
this.products = products;
//this.keys = Object.keys(this.products);
console.log(this.products);
//console.log(this.keys);
},
);
}
public ngOnInit() {
this.getAllProducts();
}
}
产品服务
import { Injectable } from '@angular/core';
import { Headers, Http, Response, RequestOptions } from '@angular/http';
import {Observable} from 'rxjs/Observable';
import 'rxjs/Rx';
@Injectable()
export class ProductService {
// private headers = new Headers({'Content-Type': 'application/json'});
private productsUrl = 'http://localhost:9000/api/products';
constructor(private http: Http) { }
public getProducts() {
return this.http.get(this.productsUrl)
.map(res => res.json())
.catch(error => {
return Observable.throw(error);
});
}
}
products.module.ts
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { PipesModule } from '../../../pipes/pipes.module';
@NgModule({
imports: [ PipesModule, BrowserModule ],
exports: [ BrowserModule, PipesModule ],
})
export class ProductsModule { }
products.component.html
<div class="main-content">
<div class="container-fluid">
<div class="row" *ngFor="let product of products" >
{{product.productName}}
</div>
</div>
</div>
敲了几个小时。如果有人能帮助我解决这个问题,那将是很好
**这是我获取数据的示例
Array[110]
[0 … 99]
0:Object
actualPrice:10
companyProductId:"1"
estimateUnitdPrice:11
id:"fde96cc0-a9de-48d8-9229-e62088f8e570"
productImageUrl:null
productName:"TEST"
whenCreated:1488466833952
1:Object
2:Object
3:Object
这是app.module.ts
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { BrowserModule } from '@angular/platform-browser';
import { RouterModule } from '@angular/router';
import { HttpModule } from '@angular/http';
import { FormsModule } from '@angular/forms';
import { LocationStrategy, HashLocationStrategy } from '@angular/common';
import { Logger } from 'angular2-logger/core';
import { PipesModule } from './pipes/pipes.module';
import { AppComponent } from './app.component';
import { PortalComponent } from './portal/portal.component';
import { PortalModule } from './portal/portal.module';
import { SidebarModule } from './sidebar/sidebar.module';
import { FooterModule } from './shared/footer/footer.module';
import { NavbarModule} from './shared/navbar/navbar.module';
@NgModule({
imports: [
BrowserModule,
CommonModule,
HttpModule,
FormsModule,
PortalModule,
SidebarModule,
NavbarModule,
FooterModule,
RouterModule.forRoot([]),
],
declarations: [ AppComponent, PortalComponent ],
bootstrap: [ AppComponent ],
providers: [ Logger, { provide: LocationStrategy, useClass: HashLocationStrategy } ],
})
export class AppModule { }
在这里,我添加了来自服务器的json响应片段
[{"id":"fde96cc0-a9de-48d8-9229-e62088f8e570","version":1,"whenCreated":1488466833952,"whenUpdated":1488466833952,"productName":"TEST","shopReference":"ALDI_SUD","estimateUnitdPrice":11.0,"productImageUrl":null,"actualPrice":10.0,"units":1,"companyProductId":"1"},{"id":"6d1d231a-cfbd-4040-abd6-fb393974cc59","version":1,"whenCreated":1488467046104,"whenUpdated":1488467046104,"productName":"TEST","shopReference":"ALDI_SUD","estimateUnitdPrice":11.0,"productImageUrl":null,"actualPrice":10.0,"units":1,"companyProductId":"1"},......]
最佳答案
不要在BrowserModule
之类的功能模块中导入ProductsModule
,而只能在根模块AppModule
中将其导入。
在这种情况下,将CommonModule
添加到功能模块的imports
属性ProductsModule
并将其从AppModule
的imports属性中删除,因为BrowserModule
本身会导出CommonModule
,因此我们无需再次导入它。
// ProductsModule
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
@NgModule({
imports: [ CommonModule ],
declarations : [ ProductsComponent ],
exports: [ ProductsComponent ]
})
export class ProductsModule { }
// AppModule
@NgModule({
imports: [
ProductsModule,
BrowserModule,
HttpModule,
FormsModule,
PortalModule,
SidebarModule,
NavbarModule,
FooterModule,
RouterModule.forRoot([]),
],
declarations: [ AppComponent, PortalComponent ],
bootstrap: [ AppComponent ],
providers: [ Logger, { provide: LocationStrategy, useClass: HashLocationStrategy } ],
})
export class AppModule { }
ProductsComponent
必须在ProductsModule
中声明并导出,ProductsModule
应该在AppModule
中导入。那会工作的。