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JS案例之1——pager 分页

原文:JS案例之1——pager 分页

学习JS大半年之久,第一次自己尝试写一些小插件,写法参考网上某位牛人写代码的思路。

此处代码写的是静态分页。如果需动态分页,还可以修改下。第一次写,还有很多地方可以优化。希望各位大牛踊跃拍砖。

预览图

 

 

源代码

  1 <!DOCTYPE html>  2 <html>  3 <head>  4 <meta http-equiv="Content-Type" Content="text/html; charset=utf-8;">  5 <title> pager demo </title>  6 <meta name="author" content="rainna" />  7 <meta name="keywords" content="rainna‘s js lib" />  8 <meta name="description" content="pager demo" />  9 </head> 10 <style> 11 *{margin:0;padding:0;} 12 li{list-style:none;} 13 .j-curr{color:red;} 14  15 #list,#pager{width:400px;margin:50px auto;text-align:center;line-height:26px;} 16 #list li{border-bottom:1px solid #eee;} 17 #pager li{display:inline-block;padding:0 5px;cursor:pointer;} 18 </style> 19 <body> 20 <div id="list"> 21     <ul> 22         <li>01111111</li> 23         <li>0222222</li> 24         <li>0333333</li> 25         <li>0444444</li> 26         <li>0555555</li> 27         <li>0666666</li> 28         <li>0777777</li> 29         <li>0888888</li> 30         <li>0999999</li> 31         <li>10101010</li> 32         <li>11111111</li> 33         <li>12121212</li> 34         <li>13131313</li> 35         <li>14141414</li> 36         <li>15151515</li> 37         <li>16161616</li> 38         <li>17171717</li> 39         <li>18181818</li> 40         <li>19191919</li> 41         <li>20202020</li> 42         <li>01111111</li> 43         <li>0222222</li> 44         <li>0333333</li> 45         <li>0444444</li> 46         <li>0555555</li> 47     </ul> 48 </div> 49 <div id="pager"></div> 50  51 <script> 52 var pager = function(){ 53     //公共函数 54     function T$(id){ 55         return document.getElementById(id); 56     } 57     function T$$(root,tag){ 58         return (root || document).getElementsByTagName(tag); 59     } 60     function $extend(object1,object2){ 61         for(var p in object2){ 62             object1[p] = object2[p]; 63         } 64         return object1; 65     } 66     function $each(arr, callback, thisp) { 67         if (arr.forEach){ 68             arr.forEach(callback, thisp); 69         }else{ 70             for(var i = 0, len = arr.length; i < len; i++){ 71                 callback.call(thisp, arr[i], i, arr); 72             } 73         } 74     } 75      76     //默认参数配置 77     var defaultOptions = { 78         elemShowCount:5,     //每页显示条数,默认为5条 79         pageShowCount:4,     //显示的页码数目,默认显示4个页码 80         showFirstPageBtnAndLastPageBtn:true,     //是否显示首页,尾页,默认显示 81         showPrevBtnAndNextBtn:true,    //是否显示上一页,下一页,默认显示 82         showPageNumTips:true,      //是否显示【1/7页】页面提示,默认显示 83         showPageNum:true      //是否显示分页的数字,默认显示 84     }; 85      86     //主类构造函数 参数说明:bid为元素容器div的ID,pid为分页容器div的ID,options为重写的默认配置参数 87     var showPage = function(bid,pid,options){    88         var self = this;              89         if(!(self instanceof showPage)){ 90             return new showPage(bid,pid,options); 91         } 92         self.container = T$(bid);    //元素容器div 93         self.pagerBox = T$(pid);    //翻页容器div 94         if(!self.container){ 95             return;                      96         } 97         self.options = $extend(defaultOptions,options||{}); 98         self.elem = T$$(self.container,li);     //需要分页的元素 99         self.elemTotalCount = self.elem.length || 0;    //分页元素的总个数100         self.pageTotalCount = Math.ceil(self.elemTotalCount/self.options.elemShowCount) || 0;   //总页数101     };102     103     showPage.prototype = {104         constructor:showPage,105         //显示当页的元素内容,参数currPageNum为当前页码,从0开始106         showChangeElemCont: function(currPageNum){                     107             var self = this;     //this为showPage对象108             var nextPageCount = (currPageNum+1)*self.options.elemShowCount < self.elemTotalCount ? (currPageNum+1)*self.options.elemShowCount : self.elemTotalCount;     //判断为最后一页时,最后一页应该显示的数据条数109             for(var i=0;i<self.elemTotalCount;i++){110                 self.elem[i].style.display = none;111             }112             for(var i=currPageNum*self.options.elemShowCount,l=nextPageCount;i<l;i++){113                 self.elem[i].style.display = block;114             }115         },116         //显示当页的页码内容,参数currPageNum为当前页码,从0开始117         showChangePageCont: function(currPageNum){                      118             var self = this;      //this为showPage对象119             var firstPageHtml = prevPageHtml = pageLinkHtml = nextPageHtml = lastPageHtml = pageTips = ‘‘;     //firstPageHtml:首页   prevPageHtml:上一页  pageLinkHtml:页码表   nextPageHtml:下一页  lastPageHtml:尾页   pageTips:页码提示120             var startPage,endPage;        //startPage:页码列表中的第一页   endPage:页码列表中的最后一页121             var pageShowMidCount = Math.ceil(self.options.pageShowCount/2);      //页码中间值,当超过这个值时,页码列表发生变化122             if(self.pageTotalCount <= self.options.pageShowCount){           //总页码数小于等于默认要显示的页码数时,直接在当前页面显示全部的页码123                 startPage = 0;124                 endPage = self.pageTotalCount-1;125             }else{126                 if(self.options.pageShowCount%2 == 0){127                     if((currPageNum + 1 - pageShowMidCount) <= 0){       //首页128                         startPage = 0;129                         endPage = self.options.pageShowCount-1;130                     }else if((currPageNum + 1 + pageShowMidCount) >= self.pageTotalCount){            //尾页131                         startPage = self.pageTotalCount-1 - self.options.pageShowCount + 1;132                         endPage = self.pageTotalCount-1;133                     }else{134                         startPage = currPageNum - pageShowMidCount + 1;135                         endPage = currPageNum + pageShowMidCount;136                     }    137                 }else{138                     if((currPageNum + 1 - pageShowMidCount) <= 0){       //首页139                         startPage = 0;140                         endPage = self.options.pageShowCount-1;141                     }else if((currPageNum + 1 + pageShowMidCount - 1) >= self.pageTotalCount){            //尾页142                         startPage = self.pageTotalCount-1 - self.options.pageShowCount + 1;143                         endPage = self.pageTotalCount-1;144                     }else{145                         startPage = currPageNum - pageShowMidCount + 1;146                         endPage = currPageNum + pageShowMidCount - 1;147                     }    148                 }    149             }150             151             //显示首页尾页152             if(self.options.showFirstPageBtnAndLastPageBtn == true){153                 firstPageHtml = <li>首页</li>;154                 lastPageHtml =     <li>尾页</li>;    155             }156             //显示上一页下一页157             if(self.options.showPrevBtnAndNextBtn == true){158                 if(currPageNum != 0) prevPageHtml = <li>上一页</li>;       //首页不显示上一页159                 if(currPageNum != self.pageTotalCount-1) nextPageHtml = <li>下一页</li>;      //尾页不显示最后一页160             }161             //显示页码数字链接162             for(var i=startPage,l=endPage;i<=l;i++){163                 if(currPageNum==i){164                     pageLinkHtml += <li class="j-curr"> + (i+1) + </li>;165                 }else{166                     pageLinkHtml += <li> + (i+1) + </li>;167                 }168             }169             //显示页码提示信息170             if(self.options.showPageNumTips == true){171                 pageTips = <span> +(currPageNum+1) + / + self.pageTotalCount + </span>;172             }173             //拼出页码元素的整体内容174             self.pagerBox.innerHTML = firstPageHtml + prevPageHtml + pageLinkHtml + nextPageHtml + lastPageHtml + pageTips;    175 176             var elems = T$$(self.pagerBox,li);177             $each(elems, function(o, i) {178                 o.onclick = function() {179                     if(o.innerText == 首页){180                         self.showChangeElemCont(0);181                         self.showChangePageCont(0);182                     }else if(o.innerText == 尾页){183                         self.showChangeElemCont(self.pageTotalCount-1);184                         self.showChangePageCont(self.pageTotalCount-1);185                     }else if(o.innerText == 上一页){186                         self.showChangeElemCont(currPageNum-1);187                         self.showChangePageCont(currPageNum-1);188                     }else if(o.innerText == 下一页){189                         self.showChangeElemCont(currPageNum+1);190                         self.showChangePageCont(currPageNum+1);191                     }else{192                         index = parseInt(o.innerText) - 1;193                         self.showChangeElemCont(index);194                         self.showChangePageCont(index);195                     }        196                 }197             });198         }199     };200     201     return{202         onShowPage:function(bid,pid,options){203             //调用主类204             var st = new showPage(bid,pid,options);205             st.showChangeElemCont(0);206             st.showChangePageCont(0);207         }208     }209 }();210 211 pager.onShowPage(list,pager,{elemShowCount:4,pageShowCount:5});212 </script>213 </body>214 </html>

源码下载:Download

JS案例之1——pager 分页