即使填写了所有输入字段并且验证插件已验证，表单也不会提交

Question

表单验证专家，我可以使用您的帮助。我正在尝试将图稿提交表单提交输入字段到数据库以及弹出＆＃34;可打印＆＃34;提交表格在新窗口中提交。 （前面提到过的＆＃34; popup＆＃34;窗口就是这个问题本身就是独一无二的。请参阅标有＆＃34; Javascript＆＃34; 的部分。无论出于何种原因，表单都会验证，但是，我没有在PHP存放邮件的电子邮件地址收到回复。提前致谢！ -qs

HTML：

<form action="mailer.php" method="post" id="signup" name="signup" onsubmit="return checkForm();">
    <table width="686"  cellspacing="2px" cellpadding="2px">
      <tr>
        <td width="190" class="gradtable"><p>Date submitted: <span style="color:red;"><small>*</small></span></p></td>
        <td width="470" class="gradtable"><span class="gradtablefootnotes"><span class="gradtable"><span class="gradtable"></span></span></span>
          <input name="first" type="text" size="50" id="first" class="required" /></td>
      </tr>
      <tr>
        <td class="gradtable"><p>Name: <span style="color:red;"><small>*</small></span></p></td>
        <td class="gradtable"><input name="last" type="text" size="50" id="last" class="required" /></td>
      </tr>
      <tr>
        <td class="gradtable"><p>Email: <span style="color:red;"><small>*</small></span></p></td>
        <td class="gradtable"><input name="email" type="text" size="50" id="email" class="required" /></td>
      </tr>
      <tr>
        <td class="gradtable"><p>Telephone: </p></td>
        <td class="gradtable"><input name="phone" type="text" size="50" id="phone" /></td>
      </tr>
      <tr>
        <td class="gradtable"><p>Category: <span style="color:red;"><small>*</small></span></p></td>
        <td class="gradtable">
            <input name="category" type="text" size="50" id="category" class="required" />
      </td>   
      </tr>
      <tr>
        <td class="gradtable">Title of piece: <span style="color:red;"><small>*</small></span></td>
        <td class="gradtable">
            <input name="title" type="text" size="50" id="title" class="required" />
          </td>
      </tr>
      <tr>
        <td class="gradtable">Main medium used:</td>
        <td class="gradtablefootnotes">
            <input name="medium" type="text" size="50" />
          </td>


      </tr>
      </table>
    <input type="submit"value="SUBMIT"/>
    </form>

使用Javascript：         

    $(document).ready(function() {
     $('#signup').validate({

       rules: {
         first: {
             required: true
         },
         last: {
            required: true
         },
         email: {
            required: true,
            email: true,
         },
         category: {
            required: true
         },
         title: {
             required: true
         },
       }, //end rules
       messages: {
          first: {
             required: "Please enter the submission date."
          },
          last: {
            required: "Please enter your first and last name.",
          },
          email: {
            required: "Please supply an e-mail address.",
            email: "This is not a valid email address."
           },
          category: {
            required: "Please supply the entry category.",
          },
          title: {
            required: "Please provide the title of the piece."
          },
       }

      }); // end validate 
    }); // end ready


    $(document).ready(function(){
        $('#signup').submit(function(){
            if ($('#first').val() == ''){
                return false;   
            } else if ($('#last').val() == ''){
                return false;
            } else if ($('#email').val() == ''){
                return false;
            } else if ($('#category').val() == ''){
                return false;
            } else if ($('#title').val() == ''){
                return false;
            } openForm();
        });
    });
    function openForm(url){
        pop = window.open("Art Submission Form.pdf","pop","scrollbars=yes");
        testPop = (pop == null || typeof(pop) == "undefined") ? true: 
            false;
            return testpop;
    }
    </script>

PHP：

    <?php
    $date = $_POST['date'];
    $name = $_POST['name'];
    $email = $_POST['email'];
    $telephone = $_POST['telephone'];
    $category = $_POST['category'];
    $title = $_POST['title'];
    $medium = $_POST['medium'];
    $formcontent=" Date submitted: $date
    \n Name: $name 
    \n Email: $email
    \n Telephone: $telephone 
    \n category: $category  
    \n title: $title
    \n medium: $medium ";
    $recipient = "artbin@somedomain.com";
    $subject = "2014 Student Art Show Submission";
    $mailheader = "From: $email \r\n";
    mail($recipient, $subject, $formcontent, $mailheader) or die("Error!");

    echo "Thank you for registering for the Student Show.  " . " " . "<a 

     href='index.html' style='text-decoration:none;color:#fffff;'> </a>";
    ?>