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XMLHTTP:內部服務器錯誤-GET問題?

[英]XMLHTTP: Internal server error - issue with GET?

我正在嘗試從存儲在服務器上的MySQL數據庫檢索一些數據。 我正在使用PHP,Javascript和AJAX來獲取數據。

當我在Chrome中運行HTML文件(New.html)並使用開發人員工具查看代碼時,它說:

GET http://example.net/Example/getuser.php?q=2500 (內部服務器錯誤)

showUser @ New.html:31onchange @ New.html:52

我認為這是指xmlhttp.onreadystatechange,並且.send()行旁邊有一個紅色的X。

<html>
<head>
    <title>New</title>
    <meta charset="UTF-8">
                              //Javascript Code
<script> 
        function showUser(str) {
            if (str == " ") {
                document.getElementById("txtHINT").innerHTML = " ";
                return;
            } else {
                if (window.XMLHttpRequest) {
                    // code for IE7+, Firfox, Chrome, Opera, Safari
                    xmlhttp = new XMLHttpRequest();  
            } else {
                   // code for IE6, IE5
            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
            }
            xmlhttp.onreadystatechange = function() {
                if (this.readyState == 4 && this.status == 200) {
                    document.getElementById("txtHint").innerHTML = this.reponseText;
                }
            };
            xmlhttp.open("GET","getuser.php?q="+str,true);
            xmlhttp.send(); //LINE 31
        }
    }
</script>
                      //CSS for HTML table
<style> 
    table         {
        width: 100%;
        border-collapse: collapse;
    }
    table, td, th {
        border: 1px solid black;
        padding: 5px;
    }   
    th            {
       text-align: left;
    }
</style>
</head>
                   <!-- Code for Form -->
<body>
    <form>
        <select name ="users" onchange="showUser(this.value)"> //LINE 51
            <option value=" ">Select a person:</option>
            <option value="1">Peter Griffin</option>
            <option value="2">Lois Griffin</option>
            <option value="3">Joseph Swanson</option>
            <option value="4">Glenn Quagmire</option>
        </select>
    </form>
    <br>
    <div id="txtHint"><b>MySQL Data should go here</b></div>
</body>
</html>

有誰知道如何解決這些問題? 也許需要將.open()放在代碼的前面? 或者也許需要某種處理程序?

PHP文件:

<html>
<head>
    <title>Latest Attempt</title>
</head>
<?php
    $q = intval($_get['q']);
    // put your connection code here
    $servername = 'localhost';
    $username = 'user';
    $password = '12345678';
    $dbname = 'ajax_demo';

    // create connection
    $conn = new mysqli($servername, $username, $password, $dbname);

    // check connection
    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error);
    }
    echo "Connected successfully";

    mysqli_select($conn,"ajax_demo");
    $sql="SELECT * FROM my_DB WHERE id = '".$q."'";
    $result = mysqli_query($conn,$sql);

    echo "<table>
    <tr>
    <th>FirstName</th>
    <th>LastName</th>
    <th>Age</th>
    <th>Hometown</th>
    <th>Job</th>
    </tr>";
    while ($row = mysqli_fetch_array($result)) {
        echo "<tr>";
        echo "<td>" . $row['FirstName'] . "</td>";
        echo "<td>" . $row['LastName'] . "</td>";
        echo "<td>" . $row['Age'] . "</td>";
        echo "<td>" . $row['Hometown'] . "</td>";
        echo "<td>" . $row['Job'] . "</td>";
        echo "</tr>";
    }
    echo "</table>";
    mysqli_close($conn);
?>
</html>

您的代碼中有一些拼寫錯誤,如果您修復了這些拼寫錯誤,您的代碼將可以正常運行:

在你的JavaScript中

在這條線

document.getElementById("txtHint").innerHTML = this.reponseText;

您的reponseText拼寫錯誤,應為responseText因此此行將類似於:

document.getElementById("txtHint").innerHTML = this.responseText;

在你的PHP中

您必須從頁面頂部刪除所有這些額外的html標簽:

<html>
<head>
    <title>Latest Attempt</title>
</head>

以及該標簽位於頁面底部:

</html>

然后您在這一行中:

$q = intval($_get['q']);

您必須輸入$ _GET的大寫形式,如下所示:

$q = intval($_GET['q']);

最后,mysqli沒有mysqli_select()函數,因此您必須完全刪除以下行:

mysqli_select($conn,"ajax_demo");

現在你可以走了:)

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