今天的目標：將路由狀態加入 store
基本上這個部份大都是標準程式碼 (boilerplate)，也就是只要照著做就可以，而且以後也可以直接拷貝這個部分的程式，在別的專案使用，官方文件 請參考，唯一有可能要改的，大概就是 CustomSerializer，等一下會看到，依照慣例，先從動作定義起
第一步： src/app/store/actions 下建立檔案
ng generate class router.actions --spec
第二步： 修改 router.actions.ts
import { Action } from '@ngrx/store';
import { NavigationExtras } from '@angular/router';
export const GO = '[router] GO';
export const BACK = '[router] BACK';
export const FORWARD = '[router] FORWARD';
export class Go implements Action {
readonly type = GO;
constructor(
public payload: {
path: any[];
query?: Object;
extras?: NavigationExtras
}
) { }
}
export class Back implements Action {
readonly type = BACK;
}
export class Forward implements Action {
readonly type = FORWARD;
}
export type Actions =
| Go
| Back
| Forward;
格式跟之前使用者動作檔一樣，三個動作，GO, BACK, FORWARD，只有 Go 有帶參數，也就是跟 router.navigate() 一樣，事實上，我們將會用 Go 來取代程式中的 router.navigate()
第三步：修改 src/app/store/actions/index.ts，加入
export * from './user.actions';
export * from './router.actions';
第一步： src/app/store/reducers 下建立檔案
ng generate class router.reducers --spec
第二步：修改 router.reducers.ts
import { ActivatedRouteSnapshot, RouterStateSnapshot, Params } from '@angular/router';
import { ActionReducerMap, createFeatureSelector, Action } from '@ngrx/store';
import { routerReducer, RouterReducerState, RouterStateSerializer } from '@ngrx/router-store';
export interface RouterStateUrl {
url: string;
queryParams: Params;
params: Params;
};
export type RouterState = RouterReducerState<RouterStateUrl>;
export const reducer = routerReducer;
export class CustomeSerializer implements RouterStateSerializer<RouterStateUrl>{
serialize(routerState: RouterStateSnapshot): RouterStateUrl {
const { url } = routerState;
const { queryParams } = routerState.root;
let state: ActivatedRouteSnapshot = routerState.root;
while (state.firstChild) {
state = state.firstChild;
}
const { params } = state;
return { url, queryParams, params };
}
}
export const getRouterState = createFeatureSelector<RouterReducerState<RouterStateUrl>>('routerReducer');
State 跟 reducer 其實套件已經幫我們寫好了，我們自己只要定義我們想要的資料，將它們定義在 RouterStateUrl 中，再用 CustomeSerializer 沿著路由一層一層往下展，用 while loop，從根 (routerState.root) 往下展開，因為路由長的樣子像是 /member/report/3，這樣找出 params，這個例子是 3
第三步：修改 src/app/reducers/index.ts
import { ActionReducerMap } from '@ngrx/store';
import * as user from './user.reducers';
import * as router from './router.reducers';
export interface State {
user: user.UsersState;
router: router.RouterState;
}
export const reducers: ActionReducerMap<State> = {
user: user.reducer,
router: router.reducer
}
export { CustomeSerializer } from './router.reducers';
架構已經在，只要將 router 的 State 跟 reducer 填進即可，最後我們要告訴模組我們要的 CustomeSeriallizer
第四步：修改 src/app/app.module.ts
//... 省略
@NgModule({
//... 省略
providers: [
//... 省略
{ provide: RouterStateSerializer, useClass: fromStore.CustomeSerializer }
],
bootstrap: [AppComponent]
})
export class AppModule { }
第一步：在 src/app/store/effects 下建立檔案
ng generate class router.effects --spec
第二步：修改 router.effects.ts
import { Injectable } from '@angular/core';
import { Router } from '@angular/router';
import { Location } from '@angular/common';
import { Action } from '@ngrx/store';
import { Effect, Actions } from '@ngrx/effects';
import * as actions from '../actions';
import { tap, map } from 'rxjs/operators';
@Injectable()
export class RouterEffects {
constructor(
private actions$: Actions,
private router: Router,
private location: Location
) { }
@Effect({ dispatch: false })
navigate$ = this.actions$
.ofType(actions.GO)
.pipe(
map((action: actions.Go) => action.payload),
tap(({ path, query: queryParams, extras }) => {
this.router.navigate(path, { queryParams, ...extras });
}));
@Effect({ dispatch: false })
navigateBack$ = this.actions$
.ofType(actions.BACK)
.pipe(tap(() => this.location.back));
@Effect({ dispatch: false })
navigateForward$ = this.actions$
.ofType(actions.FORWARD)
.pipe(tap(() => this.location.forward));
}
Go 其實就是呼叫 router.navigate 而 Forward, Back 就是 location 的 forward, back
第三步：些修改 src/app/store/effects/index.ts
import { UserEffects } from './user.effects';
import { RouterEffects } from './router.effects';
export const effects: any[] = [UserEffects, RouterEffects];
export * from './user.effects';
export * from './router.effects';
可以看到，應用這樣的架構，加入一個新的 effects 其實就是照樣填進去就行，這樣 app.module.ts 就會註冊這個新進的 effects
檢查一下 redux devtools
可以看到狀態樹中，已經多了 router 狀態
接下來，我們將用到 router.navigate() 的地方換成 store.dispatch.(new fromStore.Go())
第一步： src/app/user/login/login.component.ts
@Component({
//... 省略
constructor(
private fb: FormBuilder,
private store: Store<fromStore.State>,
private snackbar: MatSnackBar
) { }
//... 省略
login() {
this.store.dispatch(new fromStore.LoginAction(this.form.value));
this.store.select(fromStore.getIsLogin)
.subscribe(res => {
if (res) {
this.snackbar.open('登入成功', 'OK', { duration: 3000 });
//this.router.navigate(['/member']);
this.store.dispatch(new fromStore.Go({ path: ['/member'] }));
} else {
//... 省略
router.navigate(['/member']) 改為 store.dispatch(new fromStore.Go({ path: ['/member'] }))
第二步：修改 src/app/services/startup.service.ts，將 injector 刪除，並將 router.navigate() 換成 store.dispatch()
//... 省略
checkStatus() {
if (this.utils.isTokenExpired()) { // if token expired or not exist
this.store.dispatch(new fromStore.LogoutAction());
this.store.dispatch(new fromStore.Go({ path: ['/'] }));
}
}
第三步：同樣方式修改 src/app/navbar/navbar.component.ts
//.. 省略
logout() {
this.store.dispatch(new fromStore.LogoutAction());
this.store.dispatch(new fromStore.Go({ path: ['/'] }));
}
這樣登入後就可以看到，狀態的變化如下
最後剩下報告的部分，我們最後兩天來完成
iThome鐵人賽
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