提交表单时AJAX Jquery验证无效

时间:2014-04-09 10:50:45

标签: javascript jquery ajax

基本上,我需要测试子域是否存在,所以我在jQuery Validate规则中添加了一个方法uniqueSubdomain

$.validator.addMethod("uniqueSubdomain", function(value, element) {
 $.ajax({
  type: "POST",
   url: "ajax.php",
   data: 'subdomain='+ value,
   cache: false,
success: function(msg)
{
alert(msg);
  // if the subdomain exists, it returns a string "true"
  if(msg == "true"){
    return false;  // already exists
  }else{
    return true;    // subdomain is free to use
  }      
 }
 })}, "sub-domain already exists!");

在规则中:

subdomain: {               
            required: true,
            uniqueSubdomain: true           
        },

但它似乎只显示sub-domain already exists!即使它不存在!对此有任何帮助,谢谢!

4 个答案:

答案 0 :(得分:1)

您正在使用AJAX请求来检索验证结果,但是:当ajax返回结果时,验证可能已经完成,因为您正在处理异步调用。

您需要让您的ajax请求同步,以便验证不会处理结果,并使用async: false返回结果。

类似的东西:

$.validator.addMethod("uniqueSubdomain", function(value, element) {
  $.ajax({
    type: "POST",
    url: "ajax.php",
    data: 'subdomain='+ value,
    async: false,
    cache: false,
    success: function(msg)
    {
    alert(msg);
    // if the subdomain exists, it returns a string "true"
    if(msg == "true"){
      return false;  // already exists
    }else{
      return true;    // subdomain is free to use
    }      
  }
 })}, "sub-domain already exists!");

由于async选项已弃用,您可以通过执行remote validation来解决此问题:

$( "#form" ).validate({
  rules: {
    subdomain: {
      required: true,
      uniqueSubdomain: true,
      remote: {
        url: "ajax.php",
        type: "post",
        data: 'subdomain='+ value
      }
    }
  }
});

答案 1 :(得分:1)

在虚假案例中添加以下行

$("div.error").css({ display: "none" });

为您的例子

$.validator.addMethod("uniqueSubdomain", function(value, element) {
     $.ajax({
      type: "POST",
       url: "ajax.php",
       async: false,
       data: 'subdomain='+ value,
       cache: false,
    success: function(msg)
    {
    //alert(msg);
      // if the subdomain exists, it returns a string "true"
      if(msg == "true"){
        return false;  // already exists
      }else{
        $("div.error").css({ display: "none" });
        return true;    // subdomain is free to use
      }      
     }
    });
 }, "sub-domain already exists!");

仅供参考:我相信您的错误容器是“div”,如果没有,请将以下行更改为

$("errorContainer.error").css({ display: "none" });

答案 2 :(得分:1)

另一个完美的解决方案是,我们需要返回验证方法的标志。

$.validator.addMethod("uniqueSubdomain", function(value, element) {
    var isFlag;
    $.ajax({
      type: "POST",
       url: "ajax.php",
       async: false,
       data: 'subdomain='+ value,
       cache: false,
    success: function(msg)
    {
    //alert(msg);
      // if the subdomain exists, it returns a string "true"
      if(msg == "true"){
        isFlag =  false;  // already exists
      }else{
        //$("div.error").css({ display: "none" });
        isFlag = true;    // subdomain is free to use
      }      
     }
    });

    return isFlag;
 }, "sub-domain already exists!");

答案 3 :(得分:1)

您的验证和ajax正在并行工作。验证完成后,ajax可能无法完成。为此,您需要使用async:false。你可以使用以下(测试过);

$.validator.addMethod("uniqueSubdomain", function(value, element) {
    var domainOk = false
     $.ajax({
      type: "POST",
       url: "ajax.php",
       data: 'subdomain='+ value,
       cache: false,
       success: function(msg) {
          // if the subdomain exists, it returns a string "true"
          if(msg == "true"){
            domainOk = false
          }else{
            domainOk = true;
          }      
         }
     });
     return domainOk;
 }, "sub-domain already exists!");