AJAX不發送帖子數據

Question

我目前正在嘗試通過ajax將表單數據發送到php函數，但似乎沒有發送它。

這是HTML表單：

<form onSubmit="return registration();" id="registration_form">
    <input type="email" id="email_address" name="email_address" class="inputTextFooter">
    <input src="images/go.png" alt="Go" type="submit">
</form>

AJAX：

function registration(){
    if(!$('#email_address').val()){
        alert("Empty");
    }
    else {
        $.ajax( {
            type: "POST",
            url: "includes/registration_check.php",
            data: $('#registration_form').serialize(),
            success: function( response ) {
                alert( response );
            }
        });
    }
    return false;
};

最后是PHP：

$user_id = NULL;
$user_email = isset($_POST['email_address']) ? $_POST['email_address'] : '';
$distinct_query = "SELECT distinct user_email FROM user_emails";

$result=mysql_query($distinct_query, $connection);
$rows = mysql_num_rows($result) - 1;
$distinct_result_array = array();
while($fetched_array = mysql_fetch_assoc($result)) 
{
    $distinct_result_array[] = $fetched_array;
}

for ($loop = 0; $loop <= $rows; $loop++) { 
    if (in_array($user_email, $distinct_result_array[$loop])) {
        echo "Email taken.";
        break;
    }
    else{

    }
}

$query = "INSERT INTO user_emails (user_id, user_email) VALUES ('".$user_id."', '".$user_email."')";
        mysql_query($query, $connection);
        echo "You have successfully registered and will be checked by administration.";

當我發送表單時，它將添加到數據庫中，但電子郵件字段為空白。

Answer 1

更換

$user_email = isset($_POST['email_address']) ? $_POST['email_address'] : '';

用

if(empty($_POST['email_address']))
{
echo "error";
exit;
}
else
{
$user_email = $_POST['email_address'];
}

我建議您使用mysqli代替mysqli，在插入數據庫之前還要驗證用戶輸入。

Answer 2

您的函數應具有event.preventDefault()來限制默認表單提交操作，然后僅觸發您的ajax請求。

function registration(){
event.preventDefault();
    if(!$('#email_address').val()){
        alert("Empty");
    }
    else {
        $.ajax( {
            type: "POST",
            url: "includes/registration_check.php",
            data: $('#registration_form').serialize(),
            success: function( response ) {
                alert( response );
            }
        });
    }
    return false;
};

Answer 3

我認為您可能需要使用PHP的parse_str（）函數來獲取序列化數據

http://php.net/manual/zh/function.parse-str.php