不想使用第三方库，只想使用一个分页器，那么就简单的实现一个，效果如下：
1.使用方式：
<custom-pagination *ngIf="enterpriseList.length"
[fastTurnBtn]="false"
[totalPage]="paginationParams.totalPages"
[maxSize]="paginationParams.maxSize"
[(ngModel)]="paginationParams.currentPage"
(changePage)="changePage($event)">
</custom-pagination>
2.可配置项：
- fsatTurnBtn：是否显示首页和末页
- turnBtn：是否显示上下翻页
- maxSize：最多显示几页
- totalPage：总页数
- moreBtn：是否显示省略号提示更多分页
3.实现方案：
先上代码，这里使用啦ngModel实现自定义组件的数据双向绑定，可以看上一篇随记的介绍：
// custom-pagination.ts
import { Component, OnInit, Input, Output, EventEmitter, OnChanges, forwardRef } from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
@Component({
selector: 'custom-pagination',
templateUrl: './pagination.component.html',
styleUrls: ['./pagination.component.css'],
providers: [{
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef(() => PaginationComponent),
multi: true
}]
})
export class PaginationComponent implements OnInit, OnChanges {
constructor() { }
@Input() totalPage: any;
@Input() maxSize: any = 5;
@Input() moreBtn: Boolean = true;
@Input() turnBtn: Boolean = true;
@Input() fastTurnBtn: Boolean = true;
@Output() currentPageChange: EventEmitter<Number> = new EventEmitter;
@Output() changePage: EventEmitter<Number> = new EventEmitter;
private currentPage = 1;
showPageList: Array<number> = [];
showEndPage = 0;
showBeginPage = 0;
showLeftMoreStatus = false;
showRightMoreStatus = false;
ngOnInit() {
}
ngOnChanges () { // 异步获取的数据，在ngOnChange里监听数据变化后再处理分页
this.initPages();
}
currentChange() {
this.currentPageChange.emit(this.currentPage);
}
goToPage (page) {
if (page && this.currentPage !== page) {
this.currentPage = page;
this.changePageHandle();
}
}
prevNextPage (page) {
console.log(this.currentPage)
if (this.totalPage < 2) {
return;
}
let pageNum;
if (page === '上一页') {
pageNum = this.currentPage === 1 ? this.currentPage : this.currentPage - 1;
} else {
pageNum = this.currentPage === this.totalPage ? this.currentPage : this.currentPage + 1;
}
if (pageNum !== this.currentPage) {
this.currentPage = pageNum;
this.changePageHandle();
}
}
leftMoreClick () { // 左更多按钮点击后处理当前显示的分页
const startPage = this.showBeginPage - this.maxSize;
const endPage = startPage + this.maxSize;
this.currentPage -= Math.ceil((endPage - startPage) / 2);
this.changePageHandle()
}
rightMoreClick () { // 右更多分页按钮点击后处理当前显示的分页
let startPage;
if ((this.showEndPage + this.maxSize) < this.totalPage) {
startPage = this.showEndPage + this.maxSize;
} else {
startPage = this.totalPage - this.maxSize;
}
const endPage = startPage + this.maxSize;
this.currentPage += Math.ceil((endPage - startPage) / 2);
this.changePageHandle()
}
formatPages () { // 操作页码后处理需要显示的新页码数据
if (this.totalPage > this.maxSize) {
const formatRightPage = this.showEndPage - Math.ceil(this.maxSize / 2); // 需要向后处理显示分页数据的分界点
const formatLeftPage = this.showBeginPage + Math.floor(this.maxSize / 2); // 需要向前处理显示分页数据的分界点
let startPage; // 需要显示的开始页码
if (this.currentPage > formatRightPage || this.currentPage < formatLeftPage) {
startPage = this.currentPage - Math.floor(this.maxSize / 2) > 0 ? this.currentPage - Math.floor(this.maxSize / 2) : 1;
this.showBeginPage = startPage;
this.showEndPage = (startPage + this.maxSize) < this.totalPage ? (startPage + this.maxSize) : this.totalPage;
if (this.showEndPage - this.showBeginPage <= this.maxSize) { // 如果处理后显示的分页数量少于maxSize，处理需要显示的开始页码满足maxSize
startPage = this.showEndPage - this.maxSize;
this.showBeginPage = startPage;
}
this.handlePagesData(startPage, this.showEndPage);
}
}
console.log(this.showPageList)
}
initPages () { // 根据传入的参数初始化页码
if (this.totalPage > this.maxSize) {
this.maxSize--;
const startPage = this.currentPage;
this.showBeginPage = startPage;
this.showEndPage = startPage + this.maxSize;
this.handlePagesData(startPage, this.showEndPage);
} else {
this.showBeginPage = this.currentPage;
this.showEndPage = this.totalPage;
for (let i = 1; i <= this.totalPage; i++) {
this.showPageList.push(i)
}
}
this.showPagesMore();
}
handlePagesData (begin, end) { // 循环生成要显示的页码数据
this.showPageList = [];
for (let i = begin; i <= end; i++) {
this.showPageList.push(i)
}
}
showPagesMore () { // 判断是否满足显示向左向右更多分页按钮的条件
if (this.currentPage > this.maxSize * 2) {
this.showLeftMoreStatus = true;
} else {
this.showLeftMoreStatus = false;
}
if (this.showEndPage < this.totalPage) {
this.showRightMoreStatus = true;
} else {
this.showRightMoreStatus = false;
}
}
changePageHandle () { // 翻页后触发方法
this.formatPages();
this.showPagesMore();
this.onModelChange(this.currentPage); // 触发ngModel绑定的数据更新
this.changePage.emit(this.currentPage); // 向外触发自定义方法，并传值
}
onModelChange: Function = () => { };
// 页面的值改变，调用改方法，并调用onModelChange传入改变后的值，实现值得回传
writeValue(val): void {
// 页面初始化时时，调用该方法，传入初始值
if (val) {
this.currentPage = val;
}
}
registerOnChange(fn: any): void {
// 页面值改变时，调用该方法，传入新值实现回传
this.onModelChange = fn;
}
registerOnTouched(fn: any): void {
}
}
<!--custom-pagination.html--> <ul class="custom-pagination">
<li class="page-item first-page" *ngIf="fastTurnBtn" [ngClass]="{'disabled': currentPage === 1}" (click)="goToPage(1)"><span><<</span></li>
<li class="page-item prev-page" *ngIf="turnBtn" [ngClass]="{'disabled': currentPage === 1}" (click)="prevNextPage('上一页')"><span><</span></li>
<li class="page-item left-more-page" *ngIf="showLeftMoreStatus && moreBtn" (click)="leftMoreClick()" title="查看更多"><span></span></li>
<li class="page-item" *ngFor="let item of showPageList" [ngClass]="{'active': currentPage === item}" (click)="goToPage(item)">{{item}}</li>
<li class="page-item right-more-page" *ngIf="showRightMoreStatus && moreBtn" (click)="rightMoreClick()" title="查看更多"><span></span></li>
<li class="page-item next-page" *ngIf="turnBtn" [ngClass]="{'disabled': currentPage === totalPage}" (click)="prevNextPage('下一页')"><span>></span></li>
<li class="page-item last-page" *ngIf="fastTurnBtn" [ngClass]="{'disabled': currentPage === totalPage}" (click)="goToPage(totalPage)"><span>>></span></li>
</ul>
// custom-pagination.css
.custom-pagination{
overflow: hidden;
margin: 10px 0;
text-align: center;
}
.page-item{
display: inline-block;
width: 25px;
height: 25px;
line-height: 23px;
border: 1px solid #06a0e7;
color: #06a0e7;
text-align: center;
border-radius: 3px;
margin: 0 2px;
cursor: pointer;
user-select: none;
vertical-align: middle;
}
.prev-page,.next-page{
width: auto;
padding: 0 2px;
}
.page-item.active{
border-color: #06a0e7;
background: #06a0e7;
color: #fff;
}
.disabled{
cursor: not-allowed;
border-color: #d9d9d9;
color: #00000040;
}
.prev-page span,.next-page span,.first-page span,.last-page span{
display: inline-block;
transform: scale(.5, 1.2) translateY(-1px);
min-width: 20px;
}
.left-more-page span,.right-more-page span{
position: relative;
display: inline-block;
width: 100%;
height: 100%;
}
.left-more-page span:after,.right-more-page span:after{
position: absolute;
content: '•••';
width: 100%;
height: 100%;
left:;
top:;
font-size: 12px;
}
.left-more-page:hover span:after{
content: '<<';
transform: scale(.5, 1.2);
}
.right-more-page:hover span:after{
content: '>>';
transform: scale(.5, 1.2);
}
以上方案可实现简单的分页器组件，有可以更好的实现方案或者优化实现的，希望指出。