我正在尝试在 Javascript 验证后从同一 PHP 页面发送电子邮件，但在发送电子邮件时遇到了一些问题。有人可以帮我解决这个问题吗？
这是 JavaScript 代码：
<!-- -->
<script type="text/javascript">
function checkCheckBoxes() {
if (document.form.inforequired.checked == true)
{
if (document.form.option1.checked == false && document.form.option2.checked == false && document.form.option3.checked == false && document.form.option4.checked == false && document.form.option5.checked == false && document.form.option6.checked == false && document.form.option7.checked == false && document.form.option8.checked == false && document.form.option9.checked == false && document.form.option10.checked == false)
{
document.getElementById('error').innerHTML = "Please choose your options.";
return false;
}
if (document.form.option8.checked == true || document.form.option9.checked == true || document.form.option10.checked == true)
{
if (document.form.address.value == "" )
{
document.getElementById('erroraddress').innerHTML = "Please enter your address.";
return false;
}
}
else
{
document.forms["form"].submit();
return true;
}
}
else
{
document.forms["form"].submit();
return true;
}
}
</script>
<!-- Email -->
这是在 else 部分发送电子邮件的 PHP 代码。
<div id="content">
<h1 id="formSpacingHeading"> Visitor Information </h1>
<?if( !isset($_POST['submit'])):?>
<form id="form" name="form" onsubmit="return checkCheckBoxes();" action="" method="POST">
<p id="formSpacing"><label for="username" class="iconic user" > Name <span class="required">*</span></label> <input type="text" name="username" id="username" required="required" placeholder="Enter your name" /></p>
<p id="formSpacing"><label for="usermail" class="iconic mail-alt"> E-mail address <span class="required">*</span></label> <input type="email" name="usermail" id="usermail" placeholder="Enter your E-mail ID" required="required" /> </p>
<p id="formSpacing"><label for="contactno" class="iconic link"> Contact number <span class="required">*</span></label> <input type="text" pattern="^\d\d\d\d\d\d\d\d\d\d$" name="contact" id="contactno" placeholder="Enter your contact number" required="required" /></p>
<input type="submit" name="submit" value="Submit Form" />
</form>
<?php else :
$name=$_POST['username'];
$mail=$_POST['usermail'];
$contact=$_POST['contact'];
$to = "admin@xxx.com";
$subject = "New Visitor Information";
$message = $name;
$from = $mail;
$headers = "From:" . $from;
$email = mail($to, $subject, $message, $headers);
if($email){
echo "Thank you. We will keep you updated with the latest information.";
}
else{
echo "Error processing your request. Please try again later.";
}
?>
<? endif ?>