java - 来自 jQuery 的远程 AJAX 调用验证检查电子邮件有效性不起作用

Question

我正在尝试使用 Spring Boot REST API 将用于检查电子邮件可用性的远程方法调用添加到 jQuery 验证。

当使用 jQuery 的远程函数时，我可以从服务器端看到电子邮件的值和服务器响应，但在 Web 客户端中它不会显示错误“电子邮件已被占用”。

@RestController
public class ValidateController
{   
  @Autowired
    MemberService member;

    @RequestMapping(method = RequestMethod.POST, value="/checkEmail")
    public ResponseEntity<Object> checkEmail(@RequestParam("email") String email) 
  {
        System.out.println("Requested by ajax validator..." + email);
        boolean _email = this.member.existEmail(email);
        return new ResponseEntity<Object>(_email, HttpStatus.OK);
    }
}

$('#validation-form').validate({
  errorElement: 'div',
  errorClass: 'help-block',
  focusInvalid: false,
  ignore: "",
  rules: {
    email: {
      required: true,
      email: true,
      remote: {
        url: "http://localhost:8080/easyscan/checkEmail",
        type: "post",
        //dataType: "json",
        data: {
          email: function() {
            return $("#email").val();
          }
        }
      }
    }
  },
  messages: {
    email: {
      required: "Please provide a valid email.",
      email: "Please provide a valid email.",
      remote: "Email address taken."
    }
  },

Answer 1

我在使用远程方法时遇到的问题是，我的服务器返回带有许多属性的 JSON，而不仅仅是远程函数想要的 true 或 false。因此，我使用 addMethod 深入研究响应并获取我想要的 JSON 属性的值。

$.validator.addMethod("uniqueEmail", function (value, element) {
    let emailOrgName = "yourDomain/uniqueEmailCheck?emailId=" + value;
    let result = false;
    $.ajax({
        type: "GET",
        url: emailOrgName,
        dataType: "JSON",
        success: function (data) {
            if (data.data.email === 1) {
                console.log(data.data.email + ': This email exists.');
                result = false;
            } else {
                console.log(data.data.email + ': This email does not exist.');
                result = true;
            }
        },
        async: false
    });
    console.log(result);
    return result;
});

$("#form").validate({
    rules: {
        email: {
            required: true,
            email: true,
            uniqueEmail: true,
            normalizer: function (value) {
                return $.trim(value);
            }
        }
    },
    messages: {
        email: {
            required: "Please enter your email address.",
            minlength: jQuery.validator.format("Your email address must consist of at least {0} character."),
            maxlength: jQuery.validator.format("Your email address must be no longer than {0} characters."),
            uniqueEmail: "Your Email address is already registered on our system.",
        }
    },

    // Bootstrap 4 native error style.

    errorElement: "div",
    errorClass: "is-invalid",
    validClass: "is-valid",
    errorPlacement: function (error, element) {
        error.addClass("invalid-feedback");
        if (element.prop("type") === "checkbox") {
            error.insertAfter(element.next("label"));
        } else {
            error.insertAfter(element);
        }
    },
    highlight: function (element, errorClass, validClass) {
        $(element).addClass(errorClass).removeClass(validClass);
    },
    unhighlight: function (element, errorClass, validClass) {
        $(element).addClass(validClass).removeClass(errorClass);
    }
});