使用ajax实现分页技术

<div id="global"><div id="table"> <table> <col width="19%"> <col width="19%"> <col width="19%"> <col width="19%"> <col width="24%"> <tr> <th>日期</th> <th>时间</th> <th>事件</th> <th>报警画面</th> <th>事件备注</th> </tr> </table> </div> <div id="footer"> <span id="summary"></span> <ul id="pagination"> <li id="01">首页</li> <li id="02">上一页</li> <li id="03">下一页</li> <li id="04">最后一页</li> </ul> <div id="select"> <span>跳转到 </span> <input type="text" name="page_num"> <span> 页 </span> <input type="button" name="go_btn" value="跳转"> </div> </div></div>

#global{ position: relative;}#table{ position: absolute; top:19%; left:1.6%; width: 55%;}#table textarea{ width: 10vw; height: 10vh; background-color: transparent; color: #fff; border-width: 0; text-align: center;}table, th, td { border: 0.2px solid rgba(60,166,206,0.2); border-collapse: collapse; color:rgba(60,166,206,1); }th, td { padding: 3px; text-align: center; font-size: 1.6vmin;}td{ background: rgba(2,29,54,1);}th{ background: rgba(20,29,54,1); padding: 1.8% 0; color: rgba(255,255,255,0.8);}#footer{ position: absolute; bottom:5vh; left:7vw; text-align: center; color: rgba(60,166,206,1);}#pagination{ display: inline-block;}#pagination li{ display: inline;}#select{ display: inline-block; margin-left: 40px;}#select input[type="text"]{ width: 30px; height: 20px; background-color: #000; border-width: 1px;}#select input[type="button"]{ width: 40px; height: 23px; background: #000; border:none;}ul li{ cursor: pointer;}

var start_date = "2017-01-01", end_date = "2017-01-08";var pageNo = 1;var pageSize = 4;var pages = 0;

function loadData(pageNo, pageSize){ $(".detail").remove(); //每次重新从 API 数据接口获取数据都要先清除原先表格 `<tr>` 的内容 $.ajax({ url: "/history_alarm", type: "POST", data: JSON.stringify({date:date, page_num:pageNo, page_size:pageSize}), success:function(result){ var results = JSON.parse(result); var list = results.alarm; var totalCount = results.alarm_count; pages = results.page_count; if(list.length != 0){  for(var i=0; i<list.length; i++){  var alarm_id = list[i].alarm_id;  var alarm_pic = list[i].alarm_pic;  var date = list[i].date;  var event = list[i].event;  var time = list[i].time;  var remark = list[i].remark;  appendData(alarm_id, alarm_pic, date, event, time, remark);  addEvent(alarm_id);  }  $("#table").show();  $("#footer").show();  displayFooter(totalCount, pages, pageNo); } else{  $("#table").hide();  $("#footer").hide(); } }, error:function(){ //error handle function } }); }

//注意到我们将 `alarm_id` 作为 `<textarea>` 'class` 的值，也作为提交按钮 `id` 的值，这是因为我们要通过 ajax 将用户输入到某一个 `<textarea>` 的值作为参数传给后台 API 接口，由其写入数据库。function appendData(alarm_id, alarm_pic, date, event, time, remark){ var text = '<tr class="detail"><td>'+date+'</td><td>'+time+'</td<td>'+event+'</td>'+  '<td><img class="img01" src=data:image/jpeg;base64,' + alarm_pic + '</td>'+  '<td class="modity_btn"><textarea cols="5" rows="3"   class='+alarm_id+'>'+remark+'</textarea>'+'<img id='+alarm_id+' src="{{   static_url("slice/modify.png") }}"></td></tr>';; $("#table table").append(text); }

//该函数定义了如何通过 ajax 将用户输入到某一个 `<textarea>` 的值作为参数传给后台 API 接口，并写入数据库function addEvent(alarm_id){ $("#"+alarm_id).click(function(){ var remark = $("."+alarm_id).val(); if(remark != ""){ $.ajax({  url:"/history_alarm",  type:"POST",  data:JSON.stringify({alarm_id:alarm_id, note:remark}),  success:function(result){  var results = JSON.parse(result);  if(results.status == "ok"){  console.log('ok');  }  } }) } }) }

function displayFooter(totalCount, pages, pageNo){ var newText = '共' + totalCount + '条，' + '第' + pageNo + '页，' + '共' + pages + '页'; $("#summary").text(newText); }

$("input[name='page_num']").keydown(function(e){ if(e.keyCode == 13){ $("input[name='go_btn']").click(); } });$("input[name='go_btn']").click(function(){ var goPage = $("input[name='page_num']").val(); if(goPage >= 1 && goPage <=pages && goPage != pageNo){  pageNo = goPage;  loadData(pageNo, pageSize); } else{  return false; }});$("#01").click(function(){ pageNo = 1; loadData(pageNo, pageSize);});$("#04").click(function(){ pageNo = pages; loadData(pageNo, pageSize);});$("#02").click(function(){ if(pageNo == 1){  return false; } else{  pageNo--;  loadData(pageNo, pageSize); }});$("#03").click(function(){ if(pageNo == pages){  return false; } else{  pageNo++;  loadData(pageNo, pageSize); }});