php实现网页上一页下一页翻页过程详解

<a href="listmore.php?cPage=0" rel="external nofollow" rel="external nofollow" class="pull-right">更多&gt;&gt;</a>
$row=$table->fetch()每次读取一条信息，得到的是一个索引数组，代码里的$row['id']表示$row里面名为id的值，也可表示为$row.id

<?php
$link=new PDO("mysql:host=localhost;port=3306;dbname=db","root","");
$link->query("set names utf8");

 <ul id="list" class="media-list">
  <?php
    include_once('connect.php');
    $result = $link->query("select  from news");
    $total=$result->rowCount();//查询出来符合条件的总数
    $pages=ceil($total/4);//分页的总页数  
    $num = 4;//每页显示的数据条数
    $cPage = $_GET['cPage'];//获取当前是显示的第几页
    $start = $cPage  $num;//第一条数据
    $table = $link->query("select  from news order by id desc limit {$start},$num");
    $link = null;//销毁
    while ($row=$table->fetch()){//每次读出一条数据，赋给$row
      //插入多行文本，把值替换掉
    echo <<<_
      <li class="media">
        <a href="detail.php?id={$row['id']}">
        <img class="pull-left" src="{$row['src']}">
        <figcaption>
        <h4><span class="title">{$row['title']}</span> <span class="news-date">{$row['time']}</span></h4>
        <p>{$row['content']}</p>
        </figcaption>
        </a>
      </li>
  _;
    }
  ?>
</ul>

<div class="page text-center">
 <ul class="pagination" id="page">
  <li data-i="0" id="index" class="<?php if ($cPage==0) echo 'disabled'; ?>"><a href="listmore.php?cPage=0">&laquo;首页</a></li>
  <li data-i="1" class="<?php if ($cPage==0) echo 'disabled';?>"><a href="listmore.php?cPage=<?php echo $cPage>0?$cPage-1:0?>">&lt;上一页</a></li>
  <li data-i="2" class="<?php if ($cPage==$pages-1) echo 'disabled'?>"><a href="listmore.php?cPage=<?php echo $cPage==($pages-1)?$pages-1:$cPage+1?>">下一页&gt;</a></li>
  <li data-i="3" id="end" class="<?php if ($cPage==$pages-1) echo 'disabled'?>"><a href="listmore.php?cPage=<?php echo $pages-1?>">尾页&raquo;</a></li>
  <li class="disabled">
    <a href="##" id="total"><?php echo ($cPage+1)?>/<?php echo "$pages"?></a>
  </li>
  </ul>
</div>

 <div class="panel-body" id="content">
    <ul id="list" class="media-list">  
     </ul>
  </div>
  <div class="page text-center">
     <ul class="pagination" id="page">
       <li data-i="0" id="index" class="disabled"><a href="##">&laquo;首页</a></li>
       <li data-i="1" class="disabled"><a href="##">&lt;上一页</a></li>
       <li data-i="2"><a href="##">下一页&gt;</a></li>
       <li data-i="3" id="end"><a href="##">尾页&raquo;</a></li>
       <li class="disabled">
         <a href="##" id="total"></a>
       </li>
     </ul>
   </div>
   <template id="temp">     //引用模板
    <li class="media">
      <a href="detail.html?id={id}">
        <img class="pull-left" src="{src}">
        <figcaption>
          <h4><span class="title">{title}</span> <span class="news-date">{date}</span></h4>
  
          <p>{content}</p>
         </figcaption>
        </a>
      </li>
    </template>

 var html=$('#temp').html();
  var curPage=0,pages=0;
  $.getJSON('php/pages.php',function (res) {
    pages=Math.ceil(res/4);/获取信息的总页数/
  });
  function show(cPage){//替换每一页的内容
    $.getJSON('php/listmore.php',{cPage:cPage},function (json) {
      var str='';
      $('#list').empty();
      json.forEach(function (el) {
        str+=html.replace('{id}',el.id).replace('{title}',el.title).replace('{src}',el.src)
          .replace('{content}',el.content).replace('{date}',el.time);
      });
      $('#list').html(str);
    });
    $('#total').html((curPage+1)+'/'+pages);
  }
  setTimeout(function () {
    show(0);
  },100);
  $('#page').on('click','li',function () {//上下翻页，翻遍当前页的值
    var i=$(this).data('i');//jquery里特有的获取data-属性的方法
    switch (i){
      case 0:curPage=0;break;
      case 1:curPage>0?curPage--:0;break;
      case 2:curPage<(pages-1)?curPage++:pages-1;break;
      case 3:curPage=pages-1;break;
    }
    show(curPage);
    disabled(curPage);
  })
  function disabled(curPage) {//关于临界值禁止选择
    if (curPage==0){/当前页为第一页，首页和上一页选项禁止点击/
      $('#index').addClass('disabled').next().addClass('disabled');
      $('#end').removeClass('disabled').prev().removeClass('disabled');
    } else if (curPage==pages-1){
      $('#index').removeClass('disabled').next().removeClass('disabled');
      $('#end').addClass('disabled').prev().addClass('disabled');
    } else {/当前页为一页，尾页和下一页选项禁止点击/
      $('#index').removeClass('disabled').next().removeClass('disabled');
      $('#end').removeClass('disabled').prev().removeClass('disabled');
    }
  }

<?php
$link=new PDO("mysql:host=localhost;port=3306;dbname=db","root","");
$link->query("set names utf8");

<?php
include_once('connect.php');//连接数据库
$result = $link->query("select  from news");
$row=$result->rowCount();
echo $row;

<?php
include_once ('connect.php');
$num = 4;//每一页显示的数据条数
$cPage = $_GET['cPage'];//获取当前页
$start = $cPage  $num;//计算当前页显示的第一条数据的数目
/从表中查询从开始$start的一共$num条数据/
$result = $link->query("select  from news order by id desc limit {$start},$num");
$link = null;
while ($row=$result->fetch()){/每一次读取一条数据/
$json[]=$row;/把数据赋给json数组/
}
echo json_encode($json);/把json数组以json格式返回给HTML/