[Angular 2] Dispatching Action with Payloads and type to Reducers
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内容图文
While action types allow you tell your reducer what action it should take, the payload is the data that your reducer will use to update the state.
//
reducer.ts
export
const SECOND = "SECOND";
export const HOUR = "HOUR";
export const clock = (state = new Date(), {type, payload})=> {
const date = new Date(state.getTime());
switch(type){
case SECOND:
date.setSeconds(date.getSeconds() + payload);
return date;
case HOUR:
date.setHours(date.getHours() + payload);
return date;
}
return state;
};
//
app.ts
/*
*
* Created by wanzhen on 26.4.2016.
*/
import {Component}
from
‘
angular2/core
‘
;
import {Observable}
from
‘
rxjs/Observable
‘
;
import
‘
rxjs/add/observable/interval
‘
;
import
‘
rxjs/add/operator/map
‘
;
import
‘
rxjs/add/observable/merge
‘
;
import
‘
rxjs/add/operator/startWith
‘
;
import
‘
rxjs/add/operator/scan
‘
;
import
‘
rxjs/add/operator/mapTo
‘
;
import {Subject}
from
"
rxjs/Subject
"
;
import {Store}
from
‘
@ngrx/store
‘
;
import {SECOND, HOUR}
from
‘
./reducer
‘
;
@Component({
selector:
‘
app
‘
,
template: `
<button (click)="click$.next()">Update</button>
<h1>{{clock | async | date:‘yMMMMEEEEdjms‘}}</h1>
`
})
export class App {
click$ = new Subject();
clock;
constructor(store:Store) {
this.clock = store.select(‘clock‘);
Observable.merge(
this.click$.mapTo({type: HOUR, payload: 1}),
Observable.interval(1000).mapTo({type: SECOND, payload: 1})
)
.subscribe((action)=>{
store.dispatch(action)
})
}
}
//
main.ts
import {bootstrap}
from
‘
angular2/platform/browser
‘
;
import {App}
from
‘
./app
‘
;
import {provideStore}
from
‘
@ngrx/store
‘
;
import {clock}
from
‘
./reducer
‘
;
bootstrap(App, [
provideStore({clock})
]).then(
()=> console.log(‘App running...‘),
err=> console.log(err)
);
/*
* 1. Create a reducer
* 2. Use provideStore({reducer_name}) to provide store
* 3. Use store.select(‘reducer_name‘) to get store in Observable type
* 4. Apply logic to dispatch the action
* */
原文：http://www.cnblogs.com/Answer1215/p/5437348.html
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