选择选项无法连接到数据库

Question

按照我之前的问题：PHP code won't pull database information

我想通过选择选项导航交易页面。 在每个选择选项中，它将使用来自数据库的client_id并过滤列表（动态地应该更改页面以根据客户端ID过滤交易信息）。

我的sql（里面没有：client变量）显示以下信息：

我使用选择选项的部分PHP代码如下：

<?php
//url /index.php?action=clients

include('header.php'); // create top box
include('sidemenu.php'); // create side menu
//database connection


    echo "<div id='content'>";


include('pdo_connect.php');

//Read data type
$type = "";
if (isset($_REQUEST['action']))
 $type = $_REQUEST['action'];

//echo 'Action: {$type}';

switch($type) {
    case 'transactions' :
        $sql = "SELECT products.product_title, products.product_description, products.unit_price, 
            p_clients.first_name, p_clients.last_name, sales.quantity FROM p_clients INNER JOIN 
            sales ON p_clients.client_id = sales.client_id INNER JOIN products ON products.product_id = sales.product_id
            WHERE client_id = :client_id";
        $values = array(':client_id'=>$_REQUEST['client_id']);
        $transactions = getAll($sql, $values);
                    displayTransactionList($transactions);
        break;
    default:    
        defaultView();
        break;
}
include('footer.php');

function defaultView() {
?>
<!-- add page content -->
<!--  <div id='content'>-->
    <h2>Welcome to our movie store</h2>
</div>
<div id = 'image'></div>
<div id = 'box'>
<p id = 'text-box'>
Welcome to International Electronics, the store where technology is endless. Please
feel free to browse our online store items and current customer interactions.
</p>
</div>
<?php
}

    function displayTransactionList($transactions) {

    //echo "<div id='content'>
    echo"<h2>List of Client Transactions</h2>";
echo " <p>
    <h3> Select Specific Client </h3>
    <form id='myform' method='post' action='index.php'>
            <select id = 'category' name='client_id' >
                    <option selected= 'selected'> --select id--</option>
                    <option value = '1'>Client ID 1</option>
                    <option value = '2'>Client ID 2</option>
                    <option value = '3'>Client ID 3</option>
                    <option value = '4'>Client ID 4</option>
                    <option value = '5'>Client ID 5</option>
                    <option value = '6'>Client ID 6</option>
                    <option value = '7'>Client ID 7</option>
                    <option value = '8'>Client ID 8</option>
                    <option value = '9'>Client ID 9</option>
                    <option value = '10'>Client ID 10</option>
            </select>
            </li>
    <input type='hidden' name= 'action' value = 'transactions'/>
    </form></p>";

    echo "<table id = 'long'>";
    echo "<tr><td id = 'title'>First Name</td><td id= 'title'>Last Name</td><td id = 'title'>Product Title</td>
<td id = 'title'>Product Description</td><td id = 'title'>Cost</td><td id = 'title'>Quantity</td></tr>";
    //display each record
    for ($i = 0; $i < count($transactions); $i++){

    echo "<tr><td>{$transactions[$i]['first_name']}</td><td> {$transactions[$i]['last_name']}
    </td><td> {$transactions[$i]['product_title']} </td><td> {$transactions[$i]['product_description']} </td><td> 
{$transactions[$i]['unit_price']} </td><td> {$transactions[$i]['quantity']} </td></tr>";


    }

    echo "</table>";
    echo "</div>";


    }

function getAll($sql, $values =null){

global $db;
    $statm = $db->prepare($sql);

    //Method 4
    //assign a value to named parameters using an array
    //$values= array(':genre'=>'drama');
    $statm->execute($values);

    //Fetch all records
    $result = $statm->fetchAll();
    return $result;
    }

Script.js在单击选择选项时更改页面：

document.ready（function（）{

    $('#category').on('change', function() {
            //send form data
      $('#myform').submit();

      $('#content').html(); //also tried $('#content').html(response);
    });
});

sidemenu.php

<div id = 'top'>

<div class = "nav">
<ul id = "nav1" class= "text-left">
<div id = 'text-left'>
<ul id = "nav" class= "text-left">
<li><a href='index.php'>Home</a></li>
<li><a href='index.php?action=products&product_type=tv'>TV Products</a></li>
<li><a href='index.php?action=products&product_type=cell'>Cell Phone Products</a></li>
<li><a href='index.php?action=products&product_type=computer'>Computer Products</a></li>
<li><a href='index.php?action=clients'>List of Customers</a></li>
<li><a href='index.php?action=transactions'>List of Transactions</a></li>
</ul>
</div>
</div>

更新：

如果我尝试：      $ values = array（＆＃39;：client_id＆＃39; =＆gt; $ _ POST [＆＃39; client_id＆＃39;]）;

没有任何改变。

！[在此输入图片说明] [3]