AngularX中如何使用ngrx
这篇文章主要介绍Angular X中如何使用ngrx,文中介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们一定要看完!
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1.首先创建一个可路由访问的模块 这里命名为:DemopetModule。
包括文件:demopet.html、demopet.scss、demopet.component.ts、demopet.routes.ts、demopet.module.ts
代码如下:
demopet.html
Demo
demopet.scss
h2{ color:#d70029; }
demopet.component.ts
import { Component} from '@angular/core'; @Component({ selector: 'demo-pet', styleUrls: ['./demopet.scss'], templateUrl: './demopet.html' }) export class DemoPetComponent { //nothing now... }
demopet.routes.ts
import { DemoPetComponent } from './demopet.component'; export const routes = [ { path: '', pathMatch: 'full', children: [ { path: '', component: DemoPetComponent } ] } ];
demopet.module.ts
import { CommonModule } from '@angular/common'; import { FormsModule } from '@angular/forms'; import { NgModule } from '@angular/core'; import { RouterModule } from '@angular/router'; import { routes } from './demopet.routes'; @NgModule({ declarations: [ DemoPetComponent, ], imports: [ CommonModule, FormsModule, RouterModule.forChild(routes) ], providers: [ ] }) export class DemoPetModule { }
整体代码结构如下:
运行效果如下:只是为了学习方便,能够有个运行的模块
2.安装ngrx
npm install @ngrx/core --save npm install @ngrx/store --save npm install @ngrx/effects --save
@ngrx/store是一个旨在提高写性能的控制状态的容器
3.使用ngrx
首先了解下单向数据流形式
代码如下:
pet-tag.actions.ts
import { Injectable } from '@angular/core'; import { Action } from '@ngrx/store'; @Injectable() export class PettagActions{ static LOAD_DATA='Load Data'; loadData():Action{ return { type:PettagActions.LOAD_DATA }; } static LOAD_DATA_SUCCESS='Load Data Success'; loadDtaSuccess(data):Action{ return { type:PettagActions.LOAD_DATA_SUCCESS, payload:data }; } static LOAD_INFO='Load Info'; loadInfo():Action{ return { type:PettagActions.LOAD_INFO }; } static LOAD_INFO_SUCCESS='Load Info Success'; loadInfoSuccess(data):Action{ return { type:PettagActions.LOAD_INFO_SUCCESS, payload:data }; } }
pet-tag.reducer.ts
import { Action } from '@ngrx/store'; import { Observable } from 'rxjs/Observable'; import { PettagActions } from '../action/pet-tag.actions'; export function petTagReducer(state:any,action:Action){ switch(action.type){ case PettagActions.LOAD_DATA_SUCCESS:{ return action.payload; } // case PettagActions.LOAD_INFO_SUCCESS:{ // return action.payload; // } default:{ return state; } } } export function infoReducer(state:any,action:Action){ switch(action.type){ case PettagActions.LOAD_INFO_SUCCESS:{ return action.payload; } default:{ return state; } } }
NOTE:Action中定义了我们期望状态如何发生改变 Reducer实现了状态具体如何改变
Action与Store之间添加ngrx/Effect 实现action异步请求与store处理结果间的解耦
pet-tag.effect.ts
import { Injectable } from '@angular/core'; import { Effect,Actions } from '@ngrx/effects'; import { PettagActions } from '../action/pet-tag.actions'; import { PettagService } from '../service/pet-tag.service'; @Injectable() export class PettagEffect { constructor( private action$:Actions, private pettagAction:PettagActions, private service:PettagService ){} @Effect() loadData=this.action$ .ofType(PettagActions.LOAD_DATA) .switchMap(()=>this.service.getData()) .map(data=>this.pettagAction.loadDtaSuccess(data)) @Effect() loadInfo=this.action$ .ofType(PettagActions.LOAD_INFO) .switchMap(()=>this.service.getInfo()) .map(data=>this.pettagAction.loadInfoSuccess(data)); }
4.修改demopet.module.ts 添加 ngrx支持
import { StoreModule } from '@ngrx/store'; import { EffectsModule } from '@ngrx/effects'; import { PettagActions } from './action/pet-tag.actions'; import { petTagReducer,infoReducer } from './reducer/pet-tag.reducer'; import { PettagEffect } from './effect/pet-tag.effect';
@NgModule({ declarations: [ DemoPetComponent, ], imports: [ CommonModule, FormsModule, RouterModule.forChild(routes), //here new added StoreModule.provideStore({ pet:petTagReducer, info:infoReducer }), EffectsModule.run(PettagEffect) ], providers: [ PettagActions, PettagService ] }) export class DemoPetModule { }
5.调用ngrx实现数据列表获取与单个详细信息获取
demopet.component.ts
import { Component, OnInit, ViewChild, AfterViewInit } from '@angular/core'; import { Observable } from "rxjs"; import { Store } from '@ngrx/store'; import { Subscription } from 'rxjs/Subscription'; import { HttpService } from '../shared/services/http/http.service'; import { PetTag } from './model/pet-tag.model'; import { PettagActions } from './action/pet-tag.actions'; @Component({ selector: 'demo-pet', styleUrls: ['./demopet.scss'], templateUrl: './demopet.html' }) export class DemoPetComponent { private sub: Subscription; public dataArr: any; public dataItem: any; public language: string = 'en'; public param = {value: 'world'}; constructor( private store: Store, private action: PettagActions ) { this.dataArr = store.select('pet'); } ngOnInit() { this.store.dispatch(this.action.loadData()); } ngOnDestroy() { this.sub.unsubscribe(); } info() { console.log('info'); this.dataItem = this.store.select('info'); this.store.dispatch(this.action.loadInfo()); } }
demopet.html
Demo
- DEMO : {{ d.msg }}
{{ d.msg }}
6.运行效果
初始化时候获取数据列表
点击info按钮 获取详细详细
7.以上代码是从项目中取出的部分代码,其中涉及到HttpService需要自己封装,data.json demo.json两个测试用的json文件,名字随便取的当时。
http.service.ts
import { Inject, Injectable } from '@angular/core'; import { Http, Response, Headers, RequestOptions, URLSearchParams } from '@angular/http'; import { Observable } from "rxjs"; import 'rxjs/add/operator/map'; import 'rxjs/operator/delay'; import 'rxjs/operator/mergeMap'; import 'rxjs/operator/switchMap'; import 'rxjs/add/operator/catch'; import 'rxjs/add/observable/throw'; import { handleError } from './handleError'; import { rootPath } from './http.config'; @Injectable() export class HttpService { private _root: string=""; constructor(private http: Http) { this._root=rootPath; } public get(url: string, data: Map, root: string = this._root): Observable { if (root == null) root = this._root; let params = new URLSearchParams(); if (!!data) { data.forEach(function (v, k) { params.set(k, v); }); } return this.http.get(root + url, { search: params }) .map((resp: Response) => resp.json()) .catch(handleError); } }
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