Question

我有一个AJAX示例（来自W3Schools）我试图在我的服务器上运行：

HTML：

<html>
<head>
<script>
function showUser(str) {
    if (str == "") {
        document.getElementById("txtHint").innerHTML = "";
        return;
    } else { 
        if (window.XMLHttpRequest) {
            // code for IE7+, Firefox, Chrome, Opera, Safari
            xmlhttp = new XMLHttpRequest();
        } else {
            // code for IE6, IE5
            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        }
        xmlhttp.onreadystatechange = function() {
            if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                document.getElementById("txtHint").innerHTML = xmlhttp.responseText;
            }
        };
        xmlhttp.open("GET","getuser.php?q=1?q="+str,true);
        xmlhttp.send();
    }
}
</script>
</head>
<body>

<form>
<select name="users" onchange="showUser(this.value)">
  <option value="">Select a person:</option>
  <option value="1">Sophia</option>
  </select>
</form>
<br>
<div id="txtHint"><b>Person info will be listed here...</b></div>

</body>
</html>

PHP（getuser.php）：

<!DOCTYPE html>
<html>
<head>
<style>
table {
    width: 100%;
    border-collapse: collapse;
}

table, td, th {
    border: 1px solid black;
    padding: 5px;
}

th {text-align: left;}
</style>
</head>
<body>

<?php
$q = intval($_GET['q']);

// connect to db

$sql="SELECT * FROM names WHERE first = '".$q."'";
$result = mysqli_query($web_dbi, $sql) or die("Error " . mysqli_error($web_dbi));

echo "<table>
<tr>
<th>Firstname</th>
<th>Lastname</th>
<th>grad year</th>
</tr>";
while($row = mysqli_fetch_array($result)) {
    echo "<tr>";
    echo "<td>" . $row['first'] . "</td>";
    echo "<td>" . $row['last'] . "</td>";
    echo "<td>" . $row['gradyear'] . "</td>";
    echo "</tr>";
}
echo "</table>";
mysqli_close($con);
?>
</body>
</html>

我在控制台上遇到两个错误。首先，在加载页面时：

来自原产地的字体＆＃39; url1＆＃39;已被Cross-Origin阻止加载资源共享政策：No＆＃39; Access-Control-Allow-Origin＆＃39;标题是出现在请求的资源上。起源＆＃39; url2＆＃39;因此不是允许访问。

然后，当我从下拉列表中选择一个选项值时，控制台就会陷入＆＃34; xmlhttp.send（）;＆＃34;信息：

GET（url.getuser.php？q = 1）404（未找到）

感谢任何帮助。

AJAX字体来自origin和Access-Control-Allow-Origin错误

0 个答案: