javascript - PHP和Ajax做的分頁跳轉,可是出不來。望大神能看看

想做一個ajax局部刷新分頁跳轉，可是不知道為什麼用ajax接受的數據在頁面
上顯示出來總是這麼一句話MySql ErrorNo database selected 然後我做了幾個測試
發現echo"111111";echo "22222";echo"3333"echo"4444";只有4444輸出！ PHP我不是很懂
所以想麻煩大神們看下是怎麼回事！小弟在此謝過了！

---

<code><meta http-equiv="Content-Type" content="text/html; charset=utf8" />
<?php
if($_REQUEST['page'])
{
    $page = $_REQUEST['page'];
    $page=1;
    $cur_page = $page;
    $page -= 1;
    $per_page = 10;
    $previous_btn = true;
    $next_btn = true;
    $first_btn = true;
    $last_btn = true;
    $start = $page * $per_page;


    $conn=mysqli_connect("localhost","root","","info");
    mysqli_query($conn,"SET NAMES 'utf8'");
    **echo "44444444";**
    $query_pag_data = "SELECT id,name from content LIMIT $start, $per_page";
    $result_pag_data = mysql_query($query_pag_data) or die('MySql Error' . mysql_error());
    $msg = "";
    while ($row = mysql_fetch_array($result_pag_data)) {
        $htmlmsg=htmlspecialchars($row['name']);
        $msg .= "<li><b>" . $row['id'] . "</b> " . $htmlmsg . "</li>";
    }
    $msg = "<div class='data'><ul>" . $msg . "</ul></div>"; // Content for Data

    **echo "3333333333333333333333";**
    /* --------------------------------------------- */
    $query_pag_num = "SELECT COUNT(*) AS count FROM content";
    $result_pag_num = mysql_query($query_pag_num);
    $row = mysql_fetch_array($result_pag_num);
    $count = $row['count'];
    $no_of_paginations = ceil($count / $per_page);

    **echo "2222222222";**

    /* ---------------Calculating the starting and endign values for the loop----------------------------------- */
    if ($cur_page >= 7) {
        $start_loop = $cur_page - 3;
        if ($no_of_paginations > $cur_page + 3)
            $end_loop = $cur_page + 3;
        else if ($cur_page <= $no_of_paginations && $cur_page > $no_of_paginations - 6) {
            $start_loop = $no_of_paginations - 6;
            $end_loop = $no_of_paginations;
        } else {
            $end_loop = $no_of_paginations;
        }
    } else {
        $start_loop = 1;
        if ($no_of_paginations > 7)
            $end_loop = 7;
        else
            $end_loop = $no_of_paginations;
    }
    /* ----------------------------------------------------------------------------------------------------------- */
    $msg .= "<div class='pagination'><ul>";

    // FOR ENABLING THE FIRST BUTTON
    if ($first_btn && $cur_page > 1) {
        $msg .= "<li p='1' class='active'>First</li>";
    } else if ($first_btn) {
        $msg .= "<li p='1' class='inactive'>First</li>";
    }

    // FOR ENABLING THE PREVIOUS BUTTON
    if ($previous_btn && $cur_page > 1) {
        $pre = $cur_page - 1;
        $msg .= "<li p='$pre' class='active'>Previous</li>";
    } else if ($previous_btn) {
        $msg .= "<li class='inactive'>Previous</li>";
    }
    for ($i = $start_loop; $i <= $end_loop; $i++) {

        if ($cur_page == $i)
            $msg .= "<li p='$i' style='color:#fff;background-color:#006699;' class='active'>{$i}</li>";
        else
            $msg .= "<li p='$i' class='active'>{$i}</li>";
    }

    // TO ENABLE THE NEXT BUTTON
    if ($next_btn && $cur_page < $no_of_paginations) {
        $nex = $cur_page + 1;
        $msg .= "<li p='$nex' class='active'>Next</li>";
    } else if ($next_btn) {
        $msg .= "<li class='inactive'>Next</li>";
    }

    // TO ENABLE THE END BUTTON
    if ($last_btn && $cur_page < $no_of_paginations) {
        $msg .= "<li p='$no_of_paginations' class='active'>Last</li>";
    } else if ($last_btn) {
        $msg .= "<li p='$no_of_paginations' class='inactive'>Last</li>";
    }
    $goto = "<input type='text' class='goto' size='1' style='margin-top:-1px;margin-left:60px;'/><input type='button' id='go_btn' class='go_button' value='Go'/>";
    $total_string = "<span class='total' a='$no_of_paginations'>Page <b>" . $cur_page . "</b> of <b>$no_of_paginations</b></span>";
    $msg = $msg . "</ul>" . $goto . $total_string . "</div>";  // Content for pagination
    **echo $msg;**
    **echo "1111111111111";**
}
?>
</code>

以上是程式碼

回覆內容：

想做一個ajax局部刷新分頁跳轉，可是不知道為什麼用ajax接受的數據在頁面
上顯示出來總是這麼一句話MySql ErrorNo database selected 然後我做了幾個測試
發現echo"111111";echo "22222";echo"3333"echo"4444";只有4444輸出！ PHP我不是很懂
所以想麻煩大神們看下是怎麼回事！小弟在此謝過了！

---

<code><meta http-equiv="Content-Type" content="text/html; charset=utf8" />
<?php
if($_REQUEST['page'])
{
    $page = $_REQUEST['page'];
    $page=1;
    $cur_page = $page;
    $page -= 1;
    $per_page = 10;
    $previous_btn = true;
    $next_btn = true;
    $first_btn = true;
    $last_btn = true;
    $start = $page * $per_page;


    $conn=mysqli_connect("localhost","root","","info");
    mysqli_query($conn,"SET NAMES 'utf8'");
    **echo "44444444";**
    $query_pag_data = "SELECT id,name from content LIMIT $start, $per_page";
    $result_pag_data = mysql_query($query_pag_data) or die('MySql Error' . mysql_error());
    $msg = "";
    while ($row = mysql_fetch_array($result_pag_data)) {
        $htmlmsg=htmlspecialchars($row['name']);
        $msg .= "<li><b>" . $row['id'] . "</b> " . $htmlmsg . "</li>";
    }
    $msg = "<div class='data'><ul>" . $msg . "</ul></div>"; // Content for Data

    **echo "3333333333333333333333";**
    /* --------------------------------------------- */
    $query_pag_num = "SELECT COUNT(*) AS count FROM content";
    $result_pag_num = mysql_query($query_pag_num);
    $row = mysql_fetch_array($result_pag_num);
    $count = $row['count'];
    $no_of_paginations = ceil($count / $per_page);

    **echo "2222222222";**

    /* ---------------Calculating the starting and endign values for the loop----------------------------------- */
    if ($cur_page >= 7) {
        $start_loop = $cur_page - 3;
        if ($no_of_paginations > $cur_page + 3)
            $end_loop = $cur_page + 3;
        else if ($cur_page <= $no_of_paginations && $cur_page > $no_of_paginations - 6) {
            $start_loop = $no_of_paginations - 6;
            $end_loop = $no_of_paginations;
        } else {
            $end_loop = $no_of_paginations;
        }
    } else {
        $start_loop = 1;
        if ($no_of_paginations > 7)
            $end_loop = 7;
        else
            $end_loop = $no_of_paginations;
    }
    /* ----------------------------------------------------------------------------------------------------------- */
    $msg .= "<div class='pagination'><ul>";

    // FOR ENABLING THE FIRST BUTTON
    if ($first_btn && $cur_page > 1) {
        $msg .= "<li p='1' class='active'>First</li>";
    } else if ($first_btn) {
        $msg .= "<li p='1' class='inactive'>First</li>";
    }

    // FOR ENABLING THE PREVIOUS BUTTON
    if ($previous_btn && $cur_page > 1) {
        $pre = $cur_page - 1;
        $msg .= "<li p='$pre' class='active'>Previous</li>";
    } else if ($previous_btn) {
        $msg .= "<li class='inactive'>Previous</li>";
    }
    for ($i = $start_loop; $i <= $end_loop; $i++) {

        if ($cur_page == $i)
            $msg .= "<li p='$i' style='color:#fff;background-color:#006699;' class='active'>{$i}</li>";
        else
            $msg .= "<li p='$i' class='active'>{$i}</li>";
    }

    // TO ENABLE THE NEXT BUTTON
    if ($next_btn && $cur_page < $no_of_paginations) {
        $nex = $cur_page + 1;
        $msg .= "<li p='$nex' class='active'>Next</li>";
    } else if ($next_btn) {
        $msg .= "<li class='inactive'>Next</li>";
    }

    // TO ENABLE THE END BUTTON
    if ($last_btn && $cur_page < $no_of_paginations) {
        $msg .= "<li p='$no_of_paginations' class='active'>Last</li>";
    } else if ($last_btn) {
        $msg .= "<li p='$no_of_paginations' class='inactive'>Last</li>";
    }
    $goto = "<input type='text' class='goto' size='1' style='margin-top:-1px;margin-left:60px;'/><input type='button' id='go_btn' class='go_button' value='Go'/>";
    $total_string = "<span class='total' a='$no_of_paginations'>Page <b>" . $cur_page . "</b> of <b>$no_of_paginations</b></span>";
    $msg = $msg . "</ul>" . $goto . $total_string . "</div>";  // Content for pagination
    **echo $msg;**
    **echo "1111111111111";**
}
?>
</code>

以上是程式碼

看一下文檔啊 少年 點擊連結
既然你是用的mysqli，三樓說的沒錯，選擇一下資料庫，mysqli是mysqli_select_db()這個，連結裡有，你看下。

mysql 和mysqli混用！
上面用的$conn=mysqli_connect("localhost","root",","info");
下面用mysql_query($query_pag_data)

要不改成

<code class="php">$conn=mysql_connect("localhost","root","","info");
mysql_query($conn,"SET NAMES 'utf8'");</code>

這個報錯是因為沒有選擇資料庫呀，你在連線之後執行一下mysqli_query('use database')，database是你的資料庫，另外像樓上說的，別mysqli和mysql混雜用，php已經放棄mysql擴充了，用pdo或mysqli