Angular NGRx分页是一种将分页功能与Angular应用程序结合使用的解决方案。NGRx是Angular的状态管理库,可以帮助处理应用程序的状态和数据流。
下面是一个使用Angular NGRx实现分页功能的示例:
pagination.actions.ts
的文件,用于定义分页相关的动作。import { createAction, props } from '@ngrx/store';
export const goToPage = createAction('[Pagination] Go To Page', props<{ page: number }>());
export const nextPage = createAction('[Pagination] Next Page');
export const previousPage = createAction('[Pagination] Previous Page');
pagination.reducer.ts
的文件,用于处理分页状态。import { createReducer, on } from '@ngrx/store';
import { goToPage, nextPage, previousPage } from './pagination.actions';
export interface PaginationState {
currentPage: number;
}
export const initialState: PaginationState = {
currentPage: 1,
};
export const paginationReducer = createReducer(
initialState,
on(goToPage, (state, { page }) => ({ ...state, currentPage: page })),
on(nextPage, (state) => ({ ...state, currentPage: state.currentPage + 1 })),
on(previousPage, (state) => ({ ...state, currentPage: state.currentPage - 1 }))
);
app.module.ts
)中引入StoreModule
和StoreDevtoolsModule
,并在imports
数组中添加StoreModule.forRoot({ pagination: paginationReducer })
和StoreDevtoolsModule.instrument()
。import { StoreModule } from '@ngrx/store';
import { StoreDevtoolsModule } from '@ngrx/store-devtools';
import { paginationReducer } from './pagination.reducer';
@NgModule({
imports: [
StoreModule.forRoot({ pagination: paginationReducer }),
StoreDevtoolsModule.instrument()
],
// ...
})
export class AppModule { }
import { Component } from '@angular/core';
import { Store } from '@ngrx/store';
import { goToPage, nextPage, previousPage } from './pagination.actions';
@Component({
selector: 'app-pagination',
template: `
{{ currentPage }}
`
})
export class PaginationComponent {
currentPage: number;
constructor(private store: Store<{ pagination: { currentPage: number } }>) {
store.select('pagination').subscribe(({ currentPage }) => {
this.currentPage = currentPage;
});
}
goToPage(page: number) {
this.store.dispatch(goToPage({ page }));
}
nextPage() {
this.store.dispatch(nextPage());
}
previousPage() {
this.store.dispatch(previousPage());
}
}
在上述示例中,我们定义了三个分页相关的动作:goToPage
,nextPage
和previousPage
。然后,我们创建了一个分页状态的reducer,并在根模块中注册了该reducer。
组件中使用Store
订阅分页状态,并在模板中展示当前页数和相应的按钮。当按钮被点击时,我们调用dispatch方法来分发相应的动作。
这样,当用户点击按钮时,分页状态会被更新,组件也会相应地更新显示的页数。这样,我们就实现了使用Angular NGRx进行分页的解决方案。