问题
I'm new to angular and trying to implement pagination in my app. I am trying to use this material component.
With the code below, I can get length, pagesize, and pageSizeOptions in my .ts file
<md-paginator [length]="length"
[pageSize]="pageSize"
[pageSizeOptions]="pageSizeOptions"
</md-paginator>
export class PaginatorConfigurableExample {
length = 100;
pageSize = 10;
pageSizeOptions = [5, 10, 25, 100];
}
}
but I can't seem to trigger a function to change the data on the table above when the page is changed. Also, how do I use the nextPage, previousPage, hasNextPage, and hasPreviousPage methods?
回答1:
I'm struggling with the same here. But I can show you what I've got doing some research. Basically, you first start adding the page @Output event in the foo.template.ts:
<md-paginator #paginator
[length]="length"
[pageIndex]="pageIndex"
[pageSize]="pageSize"
[pageSizeOptions]="[5, 10, 25, 100]"
(page)="pageEvent = getServerData($event)"
>
</md-paginator>
And later, you have to add the pageEvent attribute in the foo.component.ts class and the others to handle paginator requirements:
pageEvent: PageEvent;
datasource: null;
pageIndex:number;
pageSize:number;
length:number;
And add the method that will fetch the server data:
ngOnInit() {
getServerData(null) ...
}
public getServerData(event?:PageEvent){
this.fooService.getdata(event).subscribe(
response =>{
if(response.error) {
// handle error
} else {
this.datasource = response.data;
this.pageIndex = response.pageIndex;
this.pageSize = response.pageSize;
this.length = response.length;
}
},
error =>{
// handle error
}
);
return event;
}
So, basically every time you click the paginator, you'll activate getServerData(..) method that will call foo.service.ts getting all data required. In this case, you do not need to handle nextPage and nextXXX events because it will be automatically calculated upon view rendering.
Hope this can help you. Let me know if you had success. =]
回答2:
Hey so I stumbled upon this and got it working, here is how:
inside my component.html
<mat-paginator #paginator [pageSize]="pageSize" [pageSizeOptions]="[5, 10, 20]" [showFirstLastButtons]="true" [length]="totalSize"
[pageIndex]="currentPage" (page)="pageEvent = handlePage($event)">
</mat-paginator>
Inside my component.ts
public array: any;
public displayedColumns = ['', '', '', '', ''];
public dataSource: any;
public pageSize = 10;
public currentPage = 0;
public totalSize = 0;
@ViewChild(MatPaginator) paginator: MatPaginator;
constructor(private app: AppService) { }
ngOnInit() {
this.getArray();
}
public handlePage(e: any) {
this.currentPage = e.pageIndex;
this.pageSize = e.pageSize;
this.iterator();
}
private getArray() {
this.app.getDeliveries()
.subscribe((response) => {
this.dataSource = new MatTableDataSource<Element>(response);
this.dataSource.paginator = this.paginator;
this.array = response;
this.totalSize = this.array.length;
this.iterator();
});
}
private iterator() {
const end = (this.currentPage + 1) * this.pageSize;
const start = this.currentPage * this.pageSize;
const part = this.array.slice(start, end);
this.dataSource = part;
}
All the paging work is done from within the iterator method. This method works out the skip and take and assigns that to the dataSource for the Material table.
回答3:
Another way to link Angular Paginator with the data table using Slice Pipe.Here data is fetched only once from server.
View:
<div class="col-md-3" *ngFor="let productObj of productListData |
slice: lowValue : highValue">
//actual data dispaly
</div>
<mat-paginator [length]="productListData.length" [pageSize]="pageSize"
(page)="pageEvent = getPaginatorData($event)">
</mat-paginator>
Component
pageIndex:number = 0;
pageSize:number = 50;
lowValue:number = 0;
highValue:number = 50;
getPaginatorData(event){
console.log(event);
if(event.pageIndex === this.pageIndex + 1){
this.lowValue = this.lowValue + this.pageSize;
this.highValue = this.highValue + this.pageSize;
}
else if(event.pageIndex === this.pageIndex - 1){
this.lowValue = this.lowValue - this.pageSize;
this.highValue = this.highValue - this.pageSize;
}
this.pageIndex = event.pageIndex;
}
回答4:
The issue in the original question is that you are not capturing "page" event, to resolve this you need to add (page)='yourEventHandler($event)' as an attribute in the md-paginator tag.
check a working example here
You can also check the API docs here
回答5:
Component:
import { Component, AfterViewInit, ViewChild } from @angular/core;
import { MatPaginator } from @angular/material;
export class ClassName implements AfterViewInit {
@ViewChild(MatPaginator) paginator: MatPaginator;
length = 1000;
pageSize = 10;
pageSizeOptions: number[] = [5, 10, 25, 100];
ngAfterViewInit() {
this.paginator.page.subscribe(
(event) => console.log(event)
);
}
HTML
<mat-paginator
[length]="length"
[pageSize]="pageSize"
[pageSizeOptions]="pageSizeOptions"
[showFirstLastButtons]="true">
</mat-paginator>
回答6:
based on Wesley Coetzee's answer i wrote this. Hope it can help anyone googling this issue. I had bugs with swapping the paginator size in the middle of the list that's why i submit my answer:
Paginator html and list
<mat-paginator [length]="localNewspapers.length" pageSize=20
(page)="getPaginatorData($event)" [pageSizeOptions]="[10, 20, 30]"
showFirstLastButtons="false">
</mat-paginator>
<mat-list>
<app-newspaper-pagi-item *ngFor="let paper of (localNewspapers |
slice: lowValue : highValue)"
[newspaper]="paper">
</app-newspaper-pagi-item>
Component logic
import {Component, Input, OnInit} from "@angular/core";
import {PageEvent} from "@angular/material";
@Component({
selector: 'app-uniques-newspaper-list',
templateUrl: './newspaper-uniques-list.component.html',
})
export class NewspaperUniquesListComponent implements OnInit {
lowValue: number = 0;
highValue: number = 20;
{...} // not relevant logic
// used to build an array of papers relevant at any given time
public getPaginatorData(event: PageEvent): PageEvent {
this.lowValue = event.pageIndex * event.pageSize;
this.highValue = this.lowValue + event.pageSize;
return event;
}
}
回答7:
This issue is resolved after spending few hours and i got it working. which is believe is the simplest way to solve the pagination with angular material. - Do first start by working on (component.html) file
<mat-paginator [pageSizeOptions]="[2, 5, 10, 15, 20]" showFirstLastButtons>
</mat-paginator>
and do in the (component.ts) file
import { MatPaginator } from '@angular/material/paginator';
import { Component, OnInit, ViewChild } from '@angular/core';
export interface UserData {
full_name: string;
email: string;
mob_number: string;
}
export class UserManagementComponent implements OnInit{
dataSource : MatTableDataSource<UserData>;
@ViewChild(MatPaginator) paginator: MatPaginator;
constructor(){
this.userList();
}
ngOnInit() { }
public userList() {
this._userManagementService.userListing().subscribe(
response => {
console.log(response['results']);
this.dataSource = new MatTableDataSource<UserData>(response['results']);
this.dataSource.paginator = this.paginator;
console.log(this.dataSource);
},
error => {});
}
}
Remember Must import the pagination module in your currently working module(module.ts) file.
import {MatPaginatorModule} from '@angular/material/paginator';
@NgModule({
imports: [MatPaginatorModule]
})
Hope it will Work for you.
回答8:
After spending few hours on this i think this is best way to apply pagination. And more importantly it works.
This is my paginator code
<mat-paginator #paginatoR [length]="length" [pageSize]="pageSize" [pageSizeOptions]="pageSizeOptions">
Inside my component @ViewChild(MatPaginator) paginator: MatPaginator; to view child and finally you have to bind paginator to table dataSource and this is how it is done
ngAfterViewInit() {this.dataSource.paginator = this.paginator;}
Easy right? if it works for you then mark this as answer.
来源：https://stackoverflow.com/questions/45318164/how-to-use-paginator-from-material-angular