[转]Angular4 自制分页控件

本文转自：https://blog.csdn.net/Junyuan_123/article/details/79486276 

过年后第一波，自制的分页控件，可能功能没有 PrimeNG 那么好，但是基本可以实现自定义翻页功能，包括：首页/最后一页/上一页/下一页。

用户可以自定义：

1. 当前默认页码（如未提供，默认为第一页）

2. 最大显示几个页码（如未提供，默认为5）

3. 每页显示几条数据 （如未提供，默认为5）

例子，共10条数据

<paginator [totalRecords]="10"
           [rows]="3"
           [currentPage]="0"
           (onPageChange)="paginate($event)">
</paginator>

<paginator [totalRecords]="10"
           [rows]="1"
           [currentPage]="0"
           (onPageChange)="paginate($event)">
</paginator>

HTML:

<ul class="pageUi clear">
<li (click)="changePage('first')"
class="fa fa-angle-double-left"
[ngClass]="{'disable': pageValidation.isFirst}">
</li>
<li (click)="changePage('pre')"
class="fa fa-angle-left"
[ngClass]="{'disable': pageValidation.isFirst}">
</li>
<li (click)="changePage(page)"
*ngFor="let page of pageArr"
[ngClass]="{'active': page == currentPage}">{{page + 1}}
</li>
<li (click)="changePage('next')"
class="fa fa-angle-right"
[ngClass]="{'disable': pageValidation.isLast}">
</li>
<li (click)="changePage('last')"
class="fa fa-angle-double-right"
[ngClass]="{'disable': pageValidation.isLast}">
</li>
</ul>

CSS: 

ul.pageUi {
display: flex;
justify-content: center;
}
ul.pageUi li {
list-style-type: none;
float: left;
display: flex;
align-items: center;
justify-content: center;
50px;
height: 50px;
border: solid 1px #ececec;
border- 1px 1px 1px 0;
}
ul.pageUi li:first-child {
border-left- 1px;
border-radius: 5px 0 0 5px;
}
ul.pageUi li:last-child {
border-radius: 0 5px 5px 0;
}
ul.pageUi li:hover {
background-color: #ececec;
cursor: pointer;
}
ul.pageUi li.active {
color: blueviolet;
font-weight: bold;
}
ul.pageUi li.disable {
color: #ccc;
background-color: #efefef;
}
ul.pageUi li.disable:hover {
background-color: none;
line-height: 50px;
}

TS:

import { Component, OnInit, Input, Output, EventEmitter } from '@angular/core';

@Component({
selector: 'paginator',
templateUrl: './paginator.component.html',
styleUrls: ['./paginator.component.css']
})

export class PaginatorComponent implements OnInit{
@Input() totalRecords: number;
@Input() rows: number = 5;
@Input() currentPage: number;
@Input() pageLinkSize: number;
@Output() onPageChange = new EventEmitter();
private pageCount: number;
private pageArr: Array<number> = [];
private pageValidation: any = { isFirst: false, isLast: false };

constructor(){}

ngOnInit(){
this.initDefaultValue();
this.getPageCount();
this.getVisiblePageArr();
this.validateIfFirstLast();
}

initDefaultValue(){
this.rows = this.rows ? this.rows : 5;
this.pageLinkSize = this.pageLinkSize ? this.pageLinkSize : 5;
this.currentPage = this.currentPage ? this.currentPage : 0;
}

getPageCount(){
this.pageCount = Math.ceil(this.totalRecords/this.rows);
}

changePage(actionKey: string){
this.getCurrentPage(actionKey);
this.getVisiblePageArr();
let data = {
first: this.currentPage * this.rows,
rows: this.rows,
page: this.currentPage,
pageCount: this.pageCount
}
this.onPageChange.emit(data);
}

getVisiblePageArr(){
this.pageArr = [];
let visiblePage = Math.min(this.pageLinkSize, this.pageCount);
let start = Math.max(0, Math.ceil(this.currentPage - visiblePage / 2));
// When page next to the end
if(this.currentPage >= Math.floor(this.pageCount - visiblePage / 2) ) {
start = Math.max(0, this.pageCount - this.pageLinkSize);
}
let end = start + visiblePage - 1;
for (var i = start; i <= end; i++) {
this.pageArr.push(i);
}
}

getCurrentPage(actionKey: string){
if(actionKey == 'first') {
this.currentPage = 0;
} else if(actionKey == 'last'){
this.currentPage = this.pageCount - 1;
} else if(actionKey == 'pre') {
if(this.currentPage <= 0) {
return;
}
this.currentPage = this.currentPage - 1;
} else if(actionKey == 'next') {
if(this.currentPage >= this.pageCount - 1){
return;
}
this.currentPage = this.currentPage + 1;
} else {
this.currentPage = Number(actionKey);
}

this.validateIfFirstLast();
}

validateIfFirstLast(){
if(this.currentPage == 0) {
this.pageValidation = { isFirst: true, isLast: false};
} else if(this.currentPage == this.pageCount - 1) {
this.pageValidation = { isFirst: false, isLast: true};
} else {
this.pageValidation = { isFirst: false, isLast: false};
}
}

}

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作者：Junyuan_123
来源：CSDN
原文：https://blog.csdn.net/Junyuan_123/article/details/79486276
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