[英]Angular / Redux Cannot read property 'dispatch' of undefined
我正在使用Angular + Redux构建购物应用程序。 我想要的是在通过调度程序函数单击时触发“ ADD_PRODUCT”操作,但是在单击产品时我只会收到以下错误:
错误TypeError:无法读取未定义的属性“ dispatch”
我在网上搜索,通过在组件中添加选择装饰器解决了类似的问题。 我也是,但仍然收到此错误。
store.ts
import { IProduct } from './product';
import { ADD_PRODUCT, REMOVE_PRODUCT, REMOVE_ALL_PRODUCTS } from './actions';
export interface IAppState {
products: IProduct[];
}
export const INITIAL_STATE: IAppState = {
products[]
}
const productsReducer = (state=[], action) => {
switch(action.type) {
case "ADD_PRODUCT" : {
state = {...state, products: action.payload}
break;
}
}
console.log("Products Reducer!")
return state;
}
const cartReducer = (state=[], action) => {
console.log("Cart Reducer!")
return state;
}
// Reducers
export const rootReducer = () => ({
products: productsReducer,
cart: cartReducer
})
store.component.ts
import { Component, OnInit } from '@angular/core';
import { NgRedux, select } from '@angular-redux/store';
import { IAppState } from '../store';
import { ADD_PRODUCT } from '../actions';
import { IProduct } from '../product';
import { Router } from "@angular/router";
import { BehaviorSubject } from 'rxjs/BehaviorSubject';
import { Http, HttpModule, Response } from '@angular/http';
import { Observable } from 'rxjs/Rx';
import 'rxjs/add/operator/map';
@Component({
selector: 'app-store',
templateUrl: './store.component.html',
styleUrls: ['./store.component.css']
})
export class StoreComponent implements OnInit {
@select() prod;
private products = new BehaviorSubject<any>([]);
product = this.products.asObservable();
dataUrl = "./assets/products.json";
prods: any;
constructor(private _http: Http, ngRedux: NgRedux<IAppState>) { }
getProducts(): Observable<any>{
return this._http.get(this.dataUrl)
.map((res: Response) => res.json());
}
ngOnInit() {
this.getProducts().subscribe(prods => this.prods = prods);
}
addToCart(prod){
this.ngRedux.dispatch({type: "ADD_PRODUCT", payload: prod})
console.log(prod.title + " added!")
}
}
store.component.html
<div class="container">
<div class="row">
<div *ngFor="let prod of prods" class="col-sm-4 col-md-4 col-lg-4">
<div class="addBtn" (click)="addToCart(prod)">Add product</div>
</div>
</div>
</div>
我做错了什么? 如何使调度员正常工作?
您忘记在组件构造函数中向ngRedux
参数添加private
ngRedux
。
constructor(private _http: Http, private ngRedux: NgRedux<IAppState>) { }
^^^^^^^
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