分页原理-2019年6月11日 - PHP

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实例

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>最新影视简介</title>
    <style>
        body{
            padding: 0;
            margin: 0;
        }
        caption{
            margin: 10px;
        }
        table{
            border-collapse: collapse;
            width: 90%;
            text-align: center;
            margin: 0 auto;
        }
        table,th,td{
            border:1px solid black;
        }
        table thead tr{
            background-color: lightgoldenrodyellow;
        }

        /*table tbody tr td:nth-last-of-type(1){*/
        /*    width: 10%;*/
        /*}*/

     ul{
         text-align: center;
     }
        ul li{
            list-style: none;
            display: inline-block;
            width: 30px;
            height: 20px;
            border: 1px solid black;
            text-align: center;
            margin-left: 10px;
            cursor: pointer;
            line-height: 20px;
        }
        ul li:hover{
            background-color: lightblue;
            border: 1px solid red;
        }
        /*高亮显示*/
        .active{
            background-color: lightblue;
            border: 1px solid red;
        }
    </style>
</head>
<body onload="getData(<?php echo $_GET['p'] ?? 1; ?>)">
<table>
    <caption>最新影视剧介绍</caption>
    <thead>
    <tr>
        <th>序号</th>
        <th>片名</th>
        <th>简介</th>
    </tr>
    </thead>
    <tbody>
    </tbody>

</table>
<!--    分页条-->
<ul>

</ul>


<script>

    function getData(p){
//创建request对象
        var request=new XMLHttpRequest();
        //监听请求
        request.onreadystatechange=function () {
            //请求成功
            if (request.readyState===4){
               // console.log(request.responseText);
                var data=JSON.parse(request.responseText);
                console.log(data);

                var ul=document.getElementsByTagName('ul').item(0);

                for (var i=0;i<data[0];i++){
                    var li=document.createElement('li');
                    li.innerHTML=(i+1);
                   //高亮显示


                     var gl=location.search.slice(3,4);
                    if(li.innerText===gl){
                        li.className='active';
                    }else{
                        li.className=null;
                    }
                     // li.className=(li.innerText===gl)? 'active':null;
                    // if(gl===p){
                    //     li.className='active';
                    // }
                    //动态显示浏览器网址数据
                    li.onclick=function(){

                        var search = location.search.slice(0,3) + this.innerText;

                        location.replace(search);

                    };
                    ul.appendChild(li);
                }
              //2.显示表格内容
                var tbody=document.getElementsByTagName('tbody').item(0);
                data[1].forEach(function (value){
                    var tr=document.createElement('tr');
                    for(var key in value ){
                        var td=document.createElement('td');
                        td.innerText=value[key];
                        tr.appendChild(td);
                    }
                    tbody.appendChild(tr);
                })

            }
        };

        //配置请求
        request.open('GET', 'get_movies.php?p='+p.toString(), true);
       //发送请求
        request.send(null);
    }

</script>
</body>
</html>

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实例

<?php









//获取当前要显示的椰树
$page=intval($_GET['p']);


$pdo = new PDO('mysql:dbname=php', 'root', '123456');

//每页显示数量
$num=5;
//总页数：需要分二步，第一步求出总"记录数量" 第二总记录数量除以每页显示的记录数量 再向上取整

$sql=  "SELECT CEIL(COUNT(`mov_id`)/{$num}) FROM `movies` ";



$stmt=$pdo->prepare($sql);

$stmt->execute();

$pages=$stmt->fetchColumn(0);


//偏移量=当前显示数量*（当前页码-1）

$offset=$num * ($page-1);
$sql = "SELECT `mov_id`,`name`, CONCAT(LEFT(`detail`,20),'...') FROM `movies` LIMIT {$num} OFFSET {$offset} ";
$stmt=$pdo->prepare($sql);
$stmt->execute();
$result=$stmt->fetchAll(PDO::FETCH_ASSOC);

echo json_encode([$pages,$result]);

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Correction status：qualified

Teacher's comments：你的进度有点慢了, 尽快跟上

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