原生js编写基于面向对象的分页组件
2020-11-27
来源：客趣旅游网
文字表达有限，直接上代码了
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>一个基于面向对象的分页组件</title>
<style>
html,body{padding:0;margin:0;}
p{padding:0;margin:0;}
a{text-decoration: none}
.Paging{overflow: hidden;}
.Paging-item{float: left;padding: 10px 15px;background: #4caf50;color: #fff;margin-left: 5px;}
.Paging-item-active{background: #ff568e;}
</style>
</head>
<body>
<div id="page"></div>
</body>
<script>
//分页组件类
function Paging(container,opt){
//自定义事件
this.eventHandlers={};
//默认设置
this.config={
nowNum: 1,
allNum: 10,
callback: function(){}
}
if(opt){
this.extend(this.config,opt);
}
//外层容器
this.Box= null;
//渲染组件
this.render(container);
}
Paging.prototype={
constructor: Paging,
/*绑定自定义事件*/
on: function(eventType,eventHandler){
if(typeof this.eventHandlers[eventType] === 'undefined'){
this.eventHandlers[eventType]= [];
}
this.eventHandlers[eventType].push(eventHandler);
},
/*触发自定义事件*/
fire: function(eventType){
if( this.eventHandlers[eventType] instanceof Array){
var len= this.eventHandlers[eventType].length;
for(var i=0;i<len;i++){
this.eventHandlers[eventType][i]();
}
}
},
/*渲染UI结构*/
renderUI: function(){
this.Box= document.createElement('div');
this.Box.className= 'Paging';
var nowNum= this.config.nowNum;
var allNum= this.config.allNum;
//当前页大于或等于4，第一页才能隐藏，总数大于5才能显示首页
if (nowNum >=4 && allNum >=6) {
var pageA= document.createElement('a');
pageA.className= 'Paging-item Paging-item-start'
pageA.href='#1';
pageA.innerHTML= '首页';
this.Box.appendChild(pageA);
};
//当前页只要不是第一页就显示上一页
if(nowNum>=2){
var pageA= document.createElement('a');
pageA.className= 'Paging-item Paging-item-pre'
pageA.href='#'+ (nowNum-1);
pageA.innerHTML= '上一页';
this.Box.appendChild(pageA);
}
//只有5页时
if(allNum<=5){
for(var i=1;i<=allNum;i++){
var pageA= document.createElement('a');
pageA.className= 'Paging-item'
pageA.href= '#'+ i;
if(nowNum==i){
pageA.className= 'Paging-item Paging-item-active'
pageA.innerHTML=i;
}else{
// pageA.innerHTML='['+ i +']';
pageA.innerHTML=i;
}
this.Box.appendChild(pageA);
}
}else{
for(var i=1;i<=5;i++){
var pageA= document.createElement('a');
pageA.className= 'Paging-item'
pageA.href= '#'+ (nowNum-3+i);
//对当前页为前2页的处理
if(nowNum === 1 || nowNum === 2){
pageA.href= '#'+ i;
if(nowNum === i){
pageA.className= 'Paging-item Paging-item-active'
pageA.innerHTML= i;
}else{
// pageA.innerHTML= '['+i+']';
pageA.innerHTML= i;
}
}/*对当前页为后2页的处理*/else if((allNum-nowNum) ===0 || (allNum-nowNum) === 1){
/*==
<a href="">[6]</a>
<a href="">[7]</a>
<a href="">[8]</a>
<a href="">[9]</a>
<a href="">10</a>
==*/
pageA.href= '#'+ ((allNum-5)+i);
if((allNum-nowNum) ===0 && i===5){
pageA.className= 'Paging-item Paging-item-active'
pageA.innerHTML=((allNum-5)+i);
}else if((allNum-nowNum) ===1 && i===4){
pageA.className= 'Paging-item Paging-item-active'
pageA.innerHTML=((allNum-5)+i);
}else{
// pageA.innerHTML= '['+ ((allNum-5)+i) +']'
pageA.innerHTML= ((allNum-5)+i)
}
}else{
if(nowNum === (nowNum-3+i)){
pageA.className= 'Paging-item Paging-item-active'
pageA.innerHTML= (nowNum-3+i);
}else{
// pageA.innerHTML= '['+ (nowNum-3+i) +']'
pageA.innerHTML= (nowNum-3+i)
}
}
this.Box.appendChild(pageA);
}
}
if((allNum-nowNum) >=1){
var pageA= document.createElement('a');
pageA.className= 'Paging-item Paging-item-next'
pageA.href='#'+ (nowNum+1);
pageA.innerHTML= '下一页';
this.Box.appendChild(pageA);
}
//选择7为标准，或7以下才能显示
if((allNum-nowNum) >= 3 && allNum >= 6){
var pageA= document.createElement('a');
pageA.className= 'Paging-item Paging-item-end'
pageA.href='#'+allNum;
pageA.innerHTML= '尾页';
this.Box.appendChild(pageA);
}
},
/*为UI绑定事件*/
bindUI: function(){
var self= this;
this.config.callback(this.config.nowNum,this.config.allNum);
//利用事件委托
self.Box.onclick= function(e){
var e= e || window.event;
var target= e.target || e.srcElement;
if(typeof e.target.getAttribute('href') === 'string'){
var nowNum= parseInt(target.getAttribute('href').substring(1));
// console.log(nowNum);
self.Box.innerHTML= '';
new Paging(null,{
nowNum: nowNum,
allNum: self.config.allNum,
callback: self.config.callback
})
}
return false;
}
},
/*渲染UI*/
render: function(container){
this.renderUI();
this.bindUI();
if(container){
var con= document.getElementById(container);
con.appendChild(this.Box);
}else{
document.body.appendChild(this.Box);
}
},
/*继承对象*/
extend: function(obj1,obj2){
for(attr in obj2){
obj1[attr]= obj2[attr];
}
}
}
//初始化调用
var page= new Paging(null,{
nowNum: 1,
allNum: 10,
callback: function(nowNum,allNum){
console.log('当前页：'+nowNum)
console.log('总页：'+allNum)
}
});
</script>
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