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Home  >  Article  >  Web Front-end  >  JQuery's Pager implementation code_jquery

JQuery's Pager implementation code_jquery

WBOY
WBOYOriginal
2016-05-16 15:02:341508browse

The example in this article shares the specific implementation code of JQuery's Pager for your reference. The specific content is as follows

Rendering:

Code:

html code: 

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>分页器</title>
 <link href="pager.css" rel="stylesheet"/>
</head>
<body>
 <div id="pager"></div>
 <script src="pager.js"></script>
 <script>
 function doChangePage(obj){
  //TO DO
 }

 var pagerBox = document.getElementById('pager');

 var pager = new Pager({
  index: 1,
  total: 15,
  parent: pagerBox,
  onchange: doChangePage
 });
 </script>
</body>
</html>

css code: 

.pager-box:after{
 display:block;
 height:0;
 visibility:hidden;
 clear:both;
 content:'';
}
.pager{
 float:left;
 position:relative;
 left:50%;
 font-family:微软雅黑;
}
.pager a,.pager span{
 position:relative;
 left:-50%;
 display:block;
 float:left;
 margin-left:5px;
 border:1px solid #b6bcc1;
 padding: 5px 10px;
 text-decoration:none;
 color:#b6bcc1;
 border-radius:3px;
}
.pager span{
 border:0;
}
.pager a.js-selected{
 background:#b6bcc1;
 color:#fff;
 cursor:default;
}
.pager a.js-disabled{
 background:#f1f1f1;
 border-color:#f1f1f1;
 cursor:default;
 color:#fff;
}

pager.js code

(function(window, undefined){

 /**
 * 创建元素节点并返回
 */
 function create(tagName, className, parent){
 var element = document.createElement(tagName);
 element.className = className;
 parent.appendChild(element);
 return element;
 }

 /**
 * 数组消除重复
 */
 function clearRepeat(arr){
 var obj = {},
  result = [];
 for(var i = 0, len = arr.length; i < len; i++){
  obj[arr[i]] = 1;
 }
 for(var i in obj){
  result.push(i);
 }
 return result;
 }

 /**
 * 添加类名
 */
 function addClassName(element, className){
 var aClass = element.className.split(' ');
 aClass.push(className);
 aClass = clearRepeat(aClass);
 element.className = aClass.join(' ');
 }
 /**
 * 删除类名
 */
 function delClassName(element, className){
 var aClass = element.className.split(' '),
  index = aClass.indexOf(className);
 if(index > 0) aClass.splice(index, 1);
 element.className = aClass.join(' ');
 }

 /**
 * 检查是否含有类名
 * @param element
 * @param className
 * @returns {boolean}
 */
 function hasClassName(element, className){
 var aClass = element.className.split(' '),
  index = aClass.indexOf(className);
 if(index > 0) return true;
 return false;
 }

 var Pager = function(obj){

 this.__total = obj.total || 1;
 this.__index = obj.index || 1;
 this.__parent = obj.parent;
 this.__onchange = obj.onchange;
 //初始化分页器
 this.__init(obj);

 };

 var pro = Pager.prototype;
 /**
 * 初始化分页器
 */
 pro.__init = function(obj){
 if(this.__total < this.__index) return;
 //存储数字
 this.__numbers = [];
 //储存省略号
 this.__dots = [];
 this.__wrapper = create('div', 'pager-box', this.__parent);
 this.__body = create('div', 'pager', this.__wrapper);
 //存储上一页
 this.__preBtn = create('a', 'prev', this.__body);
 this.__preBtn.href = 'javascript:void(0);';
 this.__preBtn.innerText = (obj.label && obj.label.prev) || '上一页';
 //存储数字
 if(this.__total < 8){
  for(var i = 0; i < this.__total; i++){
  var t = create('a', 'number', this.__body);
  t.href = 'javascript:void(0);';
  t.innerText = i + 1;
  this.__numbers.push(t);
  }
 }else{
  for(var i = 0; i < 2; i++){
  var t = create('span', 'dots', this.__body);
  t.innerText = '...';
  this.__dots.push(t);
  };
  for(var i = 0; i < 7; i++){
  var t = create('a', 'number', this.__body);
  t.href = 'javascript:void(0);';
  this.__numbers.push(t);
  }

 }
 //存储下一页
 this.__nextBtn = create('a', 'next', this.__body);
 this.__nextBtn.href = 'javascript:void(0);';
 this.__nextBtn.innerText = (obj.label && obj.label.next) || '下一页';
 //
 this._$setIndex(this.__index);
 //
 this.__body.onclick = this.__doClick.bind(this);
 };

 pro.__doClick = function(e){
 var e = e || window.event,
  target = e.target || e.srcElement;
 //点击省略号
 if(target.tagName.toLowerCase() == 'span') return;
 //点击了不能点击的上一页或者下一页
 if(hasClassName(target, 'js-disabled')) return;
 //点击了当前页
 if(hasClassName(target, 'js-selected')) return;

 if(target == this.__preBtn){
  //点击了上一页
  this._$setIndex(this.__index - 1);
 }else if(target == this.__nextBtn){
  //点击了下一页
  this._$setIndex(this.__index + 1);
 }else{
  //点击了数字
  var index = target.innerText;
  this._$setIndex(index);
 }

 };

 /**
 * 跳转页数
 */
 pro._$setIndex = function(index){

 index = parseInt(index);
 //更新信息
 if(index != this.__index){
  this.__last = this.__index;
  this.__index = index;
 }
 //处理
 delClassName(this.__preBtn, 'js-disabled');
 delClassName(this.__nextBtn, 'js-disabled');
 if(this.__total < 8){
  //总页数小于8的情况
  if(this.__last) delClassName(this.__numbers[this.__last - 1], 'js-selected');
  addClassName(this.__numbers[this.__index - 1], 'js-selected');
  if(this.__index == 1) addClassName(this.__preBtn, 'js-disabled');
  if(this.__index == this.__total) addClassName(this.__nextBtn, 'js-disabled');

 }else{
  this.__dots[0].style.display = 'none';
  this.__dots[1].style.display = 'none';
  for(var i = 0; i < 7; i++){
  delClassName(this.__numbers[i], 'js-selected');
  };
  if(this.__index < 5){
  for(var i = 0; i < 6; i++){
   this.__numbers[i].innerText = i + 1;
  }
  this.__numbers[6].innerText = this.__total;
  this.__dots[1].style.display = 'block';
  this.__body.insertBefore(this.__dots[1], this.__numbers[6]);
  addClassName(this.__numbers[this.__index - 1], 'js-selected');
  if(this.__index == 1) addClassName(this.__preBtn, 'js-disabled');
  }else if(this.__index > this.__total - 4){
  for(var i = 1; i < 7; i++){
   this.__numbers[i].innerText = this.__total + i -6;
  }
  this.__numbers[0].innerText = '1';
  this.__dots[0].style.display = 'block';
  this.__body.insertBefore(this.__dots[0], this.__numbers[1]);
  addClassName(this.__numbers[this.__index + 6 - this.__total], 'js-selected');
  if(this.__index == this.__total) addClassName(this.__nextBtn, 'js-disabled');
  }else{
  this.__numbers[0].innerText = '1';
  for(var i = 1; i < 6; i++){
   this.__numbers[i].innerText = this.__index - 3 + i;
   if(i == 3) addClassName(this.__numbers[i], 'js-selected');
  }
  this.__numbers[6].innerText = this.__total;
  this.__dots[0].style.display = 'block';
  this.__body.insertBefore(this.__dots[0], this.__numbers[1]);
  this.__dots[1].style.display = 'block';
  this.__body.insertBefore(this.__dots[1], this.__numbers[6]);
  }

 }
 if(typeof this.__onchange == 'function'){
  this.__onchange({
  index: this.__index,
  last: this.__last,
  total: this.__total
  })
 }

 };
 /**
 * 得到总页数
 */
 pro._$getIndex = function(){
 return this.__index;
 };
 /**
 * 得到上一个页数
 */
 pro._$getLast = function(){
 return this.__last;
 };
 //变成全局
 window.Pager = Pager;

})(window);

Main idea:

The paginator is divided into the following 4 situations:

Case 1, when total

Case 2, when total >= 8 and index a93788d99a8b522ccbabe9eb69cf9f1f= 8 and 5 <= index <= total - 4, display 1 and the last page, and the 5 items in the middle.

Pass in a settings object when instantiating the Pager class: 

{
 parent: element, //给分页器设置父节点
 index: index, //设置当前页
 total: total, //设置总页数
 onchange: function(){} //页数变化回调函数
}

When we instantiate Pager, execute the statements in the Pager function body, first assign the value, and then execute the initialization function: 

var Pager = function(obj){
 //赋值
 this.__total = obj.total || 1;
 this.__index = obj.index || 1;
 this.__parent = obj.parent;
 this.__onchange = obj.onchange;
 //初始化分页器
 this.__init(obj);
};

Initialization function this.__init structure: 

Pager.prototype.__init = function(obj){

 (根据上面分析的情况进行处理)
 ...
 this._$setIndex(this.__index); //跳转到初始页
 //绑定分页器点击函数
 this.__body.onclick = this.__doClick.bind(this);
};

Initialization is completed. After clicking, the corresponding judgment will be made and this._$setIndex(index) will be used to jump.

For more articles on pagination tutorials, please check out the following topics:

javascript paging function operation
jquery paging function operation
php paging function operation
ASP.NET paging function operation

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