addMethod的验证器规则总是返回true

Question

这使我发疯。在我的验证器中，通过使用addMethod规则中的ajax，通过php对数据库中是否存在电子邮件地址进行简单检查。我已经确认php文件正在输出“true”或“false”，但是该规则总是返回true，即使响应正确且值为false。

这是规则：

$.validator.addMethod("isExisting", function() { 
    var checkemail=$("#email").val(); 
    console.log('Email: '+checkemail); // shows email populated correctly 
    if(checkemail){ 
     $.ajax({ 
     type: 'post', 
     url: 'checkemail.php', 
     data: {email:checkemail,}, 
     success: function(response){ 

       console.log(response); // properly returns text "false" when email not found 

       var exists = (response=="false") ? false : true; 

       console.log('exists = '+exists); // is properly false 

       return exists; // returns false 
      } 
     }); 
    } 
}); 

而在验证 - （以下简称 “isExisting” 错误消息总是不管邮件是否真的存在或不弹出）：

$("#signupform").validate({ 
     errorLabelContainer: "#errors", 
     errorPlacement: function (error, element) { 
      error.insertAfter(element); 
     $(element).addClass(errorClass).removeClass(validClass); 
     }, 
     rules: { 
      fullname: { 
       required: true, 
       minlength: 2 
        }, 
      email: { 
       required: true, 
       email: true, 
       isExisting: true 
        }, 
      areacode: { 
       required: true, 
       digits: true, 
       minlength: 3 
        }, 
      prefix: { 
       required: true, 
       digits: true, 
       minlength: 3 
        }, 
      num: { 
       required: true, 
       digits: true, 
       minlength: 4 
        }, 
      address: { 
       required: true, 
        }, 
      city: { 
       required: true, 
       }, 
      noRobot: { 
       isCaptcha: true, 
      } 
     }, 
     messages: { 
      fullname: { 
       required: "Please enter your full name.<br />", 
       minlength: "Please enter your First and Last name.<br />" 
        }, 
      email: { 
       required: "Please enter your email address.<br />", 
       email: "Please enter a valid email address.<br />", 
       isExisting: "There is already an account with that email address.<br />" 
        }, 
      areacode: { 
       required: "Please enter your areacode.<br />", 
       minlength: "Your areacode should be 3 digits. »XXX« XXX-XXXX<br />" 
        }, 
      prefix: { 
       required: "Please enter your phone number prefix.<br />", 
       minlength: "Your phone number Prefix should be 3 digits. XXX »XXX«-XXXX<br />" 
       }, 
      num: { 
       required: "Please enter your phone number suffix.<br />", 
       minlength: "Your phone number Suffix should be 4 digits. XXX XXX-»XXXX«<br />" 
       }, 
      address: { 
       required: "Please enter your Street Address for pick-up service.<br />" 
        }, 
      city: { 
       required: "Please enter your town or city.<br />" 
        }, 
      noRobot: { 
       isCaptcha: "Please verify that your are not a spam Robot.<br />" 
        } 
     } 
}); 

我会认为“isExisting：true”只会验证true，如果真实值是从响应返回的。 （划痕头在挫折...）

checkemail.php：

else{ 
    $result = mysqli_query($connect, "SELECT * FROM `customer_info` WHERE `email`='$email' LIMIT 1"); 
    $num = mysqli_num_rows($result); 
    if($num > 0){ 
     echo "true"; 
    } 
    else { 
     echo "false"; 
    } 
} 
mysqli_close($connect); 

Answer 1

我的理解是，当响应有效验证方法应返回true。在你的情况下，有效的回应是没有匹配的电子邮件，所以你想返回true，如果AJAX调用返回false。

它很可能是减少混乱，使这个方法isUnused而不是isExisting避免布尔混乱，但你需要改变checkemail.php为好。

编辑：无视我上面的答案，我明显误解了这个问题。

我认为真正的问题是与异步调用有关。尝试在您的ajax调用中设置async：false。