注册validation和ajax认证

我有一个注册表格，当填写并按下“注册”按钮被js检查，找到空字段和检查用户名的可用性，或者如果已经使用电子邮件或手机号码通过ajax发送信息到php并接收答案。 但我的js不会一直工作。 这是我的js脚本：

$("#reg_button").click(function(){ user = $("#usr").val(); pass = $("#psw").val(); fname = $("#first_name").val(); sname = $("#second_name").val(); dateb = $("#date_birth").val(); email = $("#email").val(); mobnum = $("#mob_num").val(); if(user == ""){ alert("First name must be filled out"); $('#usr').focus(); return false; }else if(pass == ""){ alert("Password must be filled out"); $('#psw').focus(); return false; }else if(fname == ""){ alert("First name must be filled out"); $('#first_name').focus(); return false; }else if(sname == ""){ alert("Second name must be filled out"); $('#second_name').focus(); return false; }else if(dateb == ""){ alert("Date of birth must be filled out"); $('#date_birth').focus(); return false; }else if(email == ""){ alert("Email must be filled out"); $('#email').focus(); return false; }else if(mobnum == ""){ alert("Mobile number must be filled out"); $('#mob_num').focus(); return false; }else{ ajaxCheck(); } function ajaxCheck(){ $.ajax({ type: "POST", url: "http://imes.*********.com/php/check_info_reg.php", data: "usr="+user+"&email="+email+"&mob_num="+mobnum, dataType: "json", success: function(json){ if(json.success){ var user_conf = json.data.usr; var email_conf = json.data.email; var mob_conf = json.data.mob; if(user_conf == "taken"){ alert("Username already taken. Choose another one."); $('#usr').focus(); return false; } if(email_conf == "taken"){ alert("Email already registered. If you lost your password, retrieve it on login page."); $('#email').focus(); return false; } if(mob_conf == "taken"){ alert("Mobile number already registered. If you lost your password, retrieve it on login page."); $('#mob_num').focus(); return false; } }else{ //Here could go another ajax, for actualy sending the //info into the php script which sends it to database. } }, beforeSend: function() { $.mobile.showPageLoadingMsg(); }, //Show spinner complete: function() { $.mobile.hidePageLoadingMsg() }, //Hide spinner }); return false; } }); 

而我的PHP：

 = 1){ //JSON message: Username already taken. Choose different. echo json_encode(array('success'=>true, 'usr'=>"taken")); } } elseif(isset($email) && !empty($email)){ if($res2 >= 1){ //JSON message: Email already registered. Retrieve on "login"(login => link). echo json_encode(array('success'=>true, 'email'=>"taken"));; } } elseif(isset($mob_num) && !empty($mob_num)){ if($res3 >= 1){ //JSON message: Mobile number already registered. Retrieve on "login"(login => link). echo json_encode(array('success'=>true, 'mob'=>"taken")); } } else{ echo json_encode(array('success'=>false)); } ?> 

Answer 1

你的php文件中缺少一个括号：

 if(isset($username) && !empty($username){ 

应该

 if(isset($username) && !empty($username)){