我正在尝试从存储在服务器上的MySQL数据库中检索一些数据。我正在使用PHP,Javascript和AJAX来获取数据。
当我在Chrome中运行HTML文件(New.html)并使用开发人员工具查看代码时,它说;
获取http://example.net/Example/getuser.php?q=2 500(内部服务器错误)
showUser @ New.html:31onchange @ New.html:52
我认为这是指xmlhttp.onreadystatechange,并且.send()行旁边有一个红色的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>
有谁知道如何解决这些问题?也许.open()需要在代码中提前放置?或者可能需要某种处理程序?
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>
答案 0 :(得分:1)
您的代码中有一些拼写错误,如果您修复它们,您的代码将完美运行:
在JavaScript中
在这一行
document.getElementById("txtHint").innerHTML = this.reponseText;
你拼错了reponseText
,它应该是responseText
所以这一行就像是:
document.getElementById("txtHint").innerHTML = this.responseText;
在您的PHP中
您必须从页面顶部删除所有这些额外的html标记:
<html>
<head>
<title>Latest Attempt</title>
</head>
和页面底部的标签:
</html>
然后你就在这一行:
$q = intval($_get['q']);
你必须在资本中输入$ _GET,这样就像:
$q = intval($_GET['q']);
最后mysqli没有mysqli_select()
函数,所以你必须完全删除这一行:
mysqli_select($conn,"ajax_demo");
现在你很高兴:)