以php電子郵件形式顯示錯誤消息

Question

我有一個基本的聯系表，可以獲取人員姓名，電子郵件和評論，然后通過電子郵件將其發送出去。 所有字段都是必填字段，在發送電子郵件之前，我在檢查php文件中的輸入時出錯。 但是現在，如果單擊提交后輸入之一發生錯誤，它將打開新頁面並顯示錯誤消息。 我將如何僅在錯誤的輸入下方顯示錯誤消息？

這是我的php文件：

<?php
if(isset($_POST['email'])) {

    $email_to = "email@address.com";
    $email_subject = "Personal Website Contact Form";

    function died($error) {
        // your error code can go here
        echo "We are very sorry, but there were error(s) found with the form you submitted. ";
        echo "These errors appear below.<br /><br />";
        echo $error."<br /><br />";
        echo "Please go back and fix these errors.<br /><br />";
            die();
    }

    // validation expected data exists
    if(!isset($_POST['first_name']) ||
        !isset($_POST['last_name']) ||
        !isset($_POST['email']) ||
        !isset($_POST['comments'])) {
        died('We are sorry, but there appears to be a problem with the form you submitted.');       
    }

        $first_name = $_POST['first_name']; // required
        $last_name = $_POST['last_name']; // required
        $email_from = $_POST['email']; // required
        $comments = $_POST['comments']; // required

        $error_message = "";
        $email_exp = '/^[A-Za-z0-9._%-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,4}$/';

    if(!preg_match($email_exp,$email_from)) {
        $error_message .= 'The Email Address you entered does not appear to be valid.<br />';
    }

        $string_exp = "/^[A-Za-z .'-]+$/";

    if(!preg_match($string_exp,$first_name)) {
        $error_message .= 'The First Name you entered does not appear to be valid.<br />';
    }

    if(!preg_match($string_exp,$last_name)) {
        $error_message .= 'The Last Name you entered does not appear to be valid.<br />';
    }

    if(strlen($comments) < 2) {
        $error_message .= 'The Comments you entered do not appear to be valid.<br />';
    }

    if(strlen($error_message) > 0) {
        died($error_message);
    }

    $email_message = "Form details below.\n\n";

    function clean_string($string) {
        $bad = array("content-type","bcc:","to:","cc:","href");
        return str_replace($bad,"",$string);
    }

    $email_message .= "First Name: ".clean_string($first_name)."\n";
    $email_message .= "Last Name: ".clean_string($last_name)."\n";
    $email_message .= "Email: ".clean_string($email_from)."\n";
    $email_message .= "Comments: ".clean_string($comments)."\n";
}

// create email headers
$headers = 'From: '.$email_from."\r\n".
'Reply-To: '.$email_from."\r\n" .
'X-Mailer: PHP/' . phpversion();
@mail($email_to, $email_subject, $email_message, $headers); 

header("location:contact.html");

?>

Answer 1

您可以請求ajax這樣做。 您可以像這樣的Ajax發送請求將發送請求發送到您的php文件，並在php中處理請求。 返回請求錯誤或成功消息

完整示例： PHP的Ajax請求