分页组件一般只某个页面的一小部分，所以我们它是子组件
- 当然如果你承认这话的，可以往下看，因为我把他当作子组建来写了
分页组件的模版
import { Component } from '@angular/core';
@Component({
selector : "page",
template :`
<div class="page ellipsis">
<ul class="pagination" *ngIf="pageList">
<li><a href="#" aria-label="Previous" class="prev"><span aria-hidden="true">«</span></a></li>
<li *ngFor="let list of pageList"><a href="#">{{ list.pageid }}</a></li>
<li (click)="Tomessage( icur+1 )"><a href="#" aria-label="Next" class="next"><span aria-hidden="true">»</span></a></li>
</ul>
</div>
`,
styleUrls: ['./page.css'] //css样式就是bootstrap的那个
})
export class PageComponent {}
在组件中生成 pageList = []; 模拟数据
//数据结构如下
pageList = [
{
pageid: number = 1
}
{
pageid: number = 2
}
]
//生成pageList的数组
getPageList () {
//console.log(this.pageParams)
let total = 150;
let size = 10;
let icur = this.icur; //当前页码
let num = Math.ceil( total / size )
for ( var i = 0 ; i< num ;i++ ) {
if(num <= 5){
this.pageList.push({
pageid : i+1,
pageicur :icur
})
}else if( num - icur < 5 && icur > 4){
this.pageList = [
{
pageid: icur - 4,
pageicur :icur
}, {
pageid: icur - 3,
pageicur :icur
}, {
pageid: icur - 2,
pageicur :icur
}, {
pageid: icur - 1,
pageicur :icur
}, {
pageid: icur,
pageicur :icur
}
];
}else{
let cur = Math.floor((icur - 1) / 5) * 5 + 1
this.pageList = [
{
pageid: cur ,
pageicur :icur
}, {
pageid: cur + 1,
pageicur :icur
}, {
pageid: cur + 2,
pageicur :icur
}, {
pageid: cur + 3,
pageicur :icur
}, {
pageid: cur + 4,
pageicur :icur
}
]
}
}
}
引入 装饰器Output 时间发射器EventEmitter 钩子函数的一种状态OnInit
//如下所示
import { Component, Output, EventEmitter, OnInit } from '@angular/core';
- 此时模版的结构---就变成这个样子了
import { Component, Output, EventEmitter, OnInit } from '@angular/core';
@Component({
selector : "page",
template :`
//....
`,
styleUrls: ['./page.css'] //css样式就是bootstrap的那个
})
export class PageComponent implements OnInit{
//这个数据应该是一步获得的
private pageList = [];
private icur = 1; //这里是私有变量
//组件初始化的时候调用该函数
ngOnInit(): void {
this.getPageList();
}
//分页函数
getPageList () {
//.....
}
}
此时组件的基本结构都有了，然后创建一个父组件
import { Component } from '@angular/core';
import { PageComponent } from "./son.component"; //别忘记在父组建中导入了
@Component({
selector: 'app-root',
template: `
<page> </page>
`,
styleUrls: ['./app.component.css']
})
export class AppComponent {
}
至此到这一步，应该可以看到一个效果图
! [page图] (http://images.cnblogs.com/cnblogs_com/he-zhi/1004820/o_2.png)
当然，现在这种东西很明显没有什么乱用，点击向上的话，就需要将icur这个值不断的增加
- 此时就需要设计到子组件---> 父组件之间的通讯
//需要一些什么东西呢 --这个装饰器@Output h还有事件发射器EventEmitter
//PageComponent 中导入所需要的动西
import { Component, Output, EventEmitter, OnInit } from '@angular/core';
//第二步---实例化一个发射器
@Output() OnChange: EventEmitter<string> = new EventEmitter();
//注册一个事件，点击的时候出发
Tomessage(value: any){
this.OnChange.emit( value )
this.icur = value;
}
//第三步需要到父组建中帮顶OnChange
//AppComponent
import { Component } from '@angular/core';
import { PageComponent } from "./son.component"; //别忘记在父组建中导入了
@Component({
selector: 'app-root',
template: `
<page (OnChange)="any($num)"> </page> //这里有一$千万不能省略
`,
styleUrls: ['./app.component.css']
})
export class AppComponent {
any(num:any){
alert(num);
}
}
至此所有的注意点 基本标注了，以下是分页组件的全部完整demo
如果你想跑起来，你需要先使用 angular的脚手架创建一个项目结构
基本赋值黏贴就可以了，
关于子组建到---父组建的通讯，感觉太简单 就没有细说
子组建发射 --- 父组建接受
import { Component, Output, EventEmitter, OnInit } from '@angular/core';
@Component({
selector : "page",
template :`
<div class="page ellipsis">
<ul class="pagination" *ngIf="pageList">
<li><a href="#" aria-label="Previous" class="prev"><span aria-hidden="true">«</span></a></li>
<li *ngFor="let list of pageList"><a href="#">{{ list.pageid }}</a></li>
<li (click)="Tomessage( icur+1 )"><a href="#" aria-label="Next" class="next"><span aria-hidden="true">»</span></a></li>
</ul>
</div>
`,
styleUrls: ['./page.css'] //css样式就是bootstrap的那个
})
export class PageComponent implements OnInit{
@Output() OnChange: EventEmitter<string> = new EventEmitter();
Tomessage(value: any){
this.OnChange.emit( value )
this.icur = value;
}
//这个数据应该是一步获得的
pageList = [];
icur = 1; //这里是全局变量
ngOnInit(): void {
this.getPageList();
}
//分页函数
getPageList () {
//console.log(this.pageParams)
let total = 150;
let size = 10;
let icur = this.icur; //当前页码
let num = Math.ceil( total / size )
for ( var i = 0 ; i< num ;i++ ) {
if(num <= 5){
this.pageList.push({
pageid : i+1,
pageicur :icur
})
}else if( num - icur < 5 && icur > 4){
this.pageList = [
{
pageid: icur - 4,
pageicur :icur
}, {
pageid: icur - 3,
pageicur :icur
}, {
pageid: icur - 2,
pageicur :icur
}, {
pageid: icur - 1,
pageicur :icur
}, {
pageid: icur,
pageicur :icur
}
];
}else{
let cur = Math.floor((icur - 1) / 5) * 5 + 1
this.pageList = [
{
pageid: cur ,
pageicur :icur
}, {
pageid: cur + 1,
pageicur :icur
}, {
pageid: cur + 2,
pageicur :icur
}, {
pageid: cur + 3,
pageicur :icur
}, {
pageid: cur + 4,
pageicur :icur
}
]
}
}
}
}