我有我的 html 页面，人们可以在其中注册，它调用我的 php 页面来检查和输入到 db，如果我收到错误，例如有人没有选择他们的性别，它会提醒用户应该这样做。问题是，如果用户没有选择性别并再次提交，那么现在调用 ajax 两次，我收到两条相同的警报消息，如果再次完成，我会收到三个警报消息，并且每次按下都会继续增长等等。我怎么能阻止这种情况发生。
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<meta name="apple-mobile-web-app-capable" content="yes" />
<meta name="apple-mobile-web-app-status-bar-style" content="black" />
<title>
</title>
<link rel="stylesheet" href="css/logout-button.min.css" />
<link rel="stylesheet" href="css/jquery.mobile-1.3.0.min.css" />
<link rel="stylesheet" href="css/my.css" />
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
</script>
<script src="js/jquery.mobile-1.3.0.min.js"></script>
<script src="js/jquery.cookies.2.2.0.min.js"></script>
<script src="js/account-login.js"></script>
</head>
<body>
<!-- Home -->
<div data-role="page" id="account-signup">
<script>
function submitForm() {
$(document).ready(function() {
$("form#signupForm").submit(function() {
var form_data = $('#signupForm').serialize();
$.ajax({
type: "POST",
url: "ajaxResponder.php",
dataType: 'html',
data: form_data,
complete: function(data){
if(data.responseText == 'yes'){
alert("Your Account has been created");
$.mobile.changePage( "account-login.html", { transition: "slide"} );
}else {
alert(data.responseText);
}
}
});
return false;
});
});
}
</script>
<div data-theme="a" data-role="header">
<a data-role="button" href="account-login.html" data-transition="slide"
data-icon="arrow-l" data-iconpos="left" class="ui-btn-left">
Back
</a>
<h3>
Sign-Up
</h3>
</div>
<div data-role="content">
<form id="signupForm" name="signupForm">
<input name="method" id="method" placeholder="method" value="account-signup" type="hidden" />
<div data-role="fieldcontain">
<fieldset data-role="controlgroup">
<label for="forename">
Forename *
</label>
<input name="forename" id="forename" placeholder="Forename" value="" type="text" />
</fieldset>
</div>
<div data-role="fieldcontain">
<fieldset data-role="controlgroup">
<label for="surname">
Surname *
</label>
<input name="surname" id="surname" placeholder="Surname" value="" type="text" />
</fieldset>
</div>
<div data-role="fieldcontain">
<label for="gender">Gender</label>
<select name="gender" id="gender" data-native-menu="false">
<option>Gender</option>
<option value="male">Male</option>
<option value="female">Female</option>
</select>
</div>
<div data-role="fieldcontain">
<script type="text/javascript">
$(function(){
var items="";
$.getJSON("ajaxResponder.php?method=account-signup-countries",function(data){
items+='<option value="Select Country">Select Country</option>';
$.each(data,function(index,item)
{
items+="<option value='"+item.id+"'>"+item.name+"</option>";
});
$("#countries").html(items);
$("#countries").trigger("change");
});
});
</script>
<legend>Country *</legend>
<select name="countries" id="countries" data-native-menu="false">
</select>
</div>
<div data-role="fieldcontain">
<fieldset data-role="controlgroup">
<label for="email">
Email *
</label>
<input name="email" id="email" placeholder="Email" value="" type="text" />
</fieldset>
</div>
<div data-role="fieldcontain">
<fieldset data-role="controlgroup">
<label for="password">
Password *
</label>
<input name="password" id="password" placeholder="Password" value="" type="password" />
<label for="confirm">
Confirm Password *
</label>
<input name="confirm" id="confirm" placeholder="Confirm" value="" type="password" />
</fieldset>
</div>
<input data-theme="b" value="Sign-Up" type="submit" onclick="submitForm()" />
</form>
</div>
</div>
</body>
</html>
我的PHP
case 'account-signup':
$password_minlength = 6;
$password_maxlength = 40;
$message == "";
function validusername($username) {
$allowedchars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ¥µÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖØÙÚÛÜÝßàáâãäåæçèéêëìíîïðñòóôõöøùúûüýÿ'";
for ($i = 0; $i < strlen($username); ++$i)
if (strpos($allowedchars, $username[$i]) === false)
return false;
return true;
}
$forename= $_POST["forename"];
$surname= $_POST["surname"];
$email= $_POST["email"];
$password= $_POST["password"];
$confirm= $_POST["confirm"];
$day = $_POST["select-choice-day"];
$month = $_POST["select-choice-month"];
$year = $_POST["select-choice-year"];
$country = $_POST["countries"];
$gender = $_POST["gender"];
if ($day =='Day' or $month == 'Mon' or $year =='Year')
$message = "You Need to fill in Your DOB";
if ($gender =='Gender')
$message ="Please select your Gender";
if ($country == "Select Country")
$message ="Please select a Country";
if (empty($password) || empty($forename) || empty($surname) || empty($email) || empty($confirm) )
$message = "All fields required to be filled in";
elseif ($password != $confirm)
$message = "Your passwords do not match";
elseif (strlen($password) < $password_minlength)
$message = sprintf("Your password needs to be more than $password_minlength char");
elseif (strlen($password) > $password_maxlength)
$message = sprintf("Your password needs to be less than $password_maxlength char");
elseif (!validusername($forename))
$message = "Invalid characters used in your forename";
elseif (!validusername($surname))
$message = "Invalid characters used in your surname";
elseif (!validemail($email))
$message = "A Valid email address is required";
if ($message == "") {
// check if email addy is already in use
$a = (@mysql_fetch_row(@SQL_Query_exec("select count(*) from users where email='$email'")));
if ($a[0] != 0)
$message = "Email Address $email has already signed up. Please use account-recovery ";
}
if ($message == "") {
$signupclass = '1';
$status = "confirmed";
$dob = "$year-$month-$day";
$secret = mksecret(); //generate secret field
$password = passhash($password);// hash the password
$forename1 = str_replace('\' ', '\'', ucwords(str_replace('\'', '\' ', strtolower($forename))));
$surname1 = str_replace('\' ', '\'', ucwords(str_replace('\'', '\' ', strtolower($surname))));
SQL_Query_exec("INSERT INTO users (forename,surname, password, secret, email, status, added, last_access, country, gender,dob, stylesheet, language, class, ip) VALUES (" .
implode(",", array_map("sqlesc", array($forename1,$surname1, $password, $secret, $email, $status, get_date_time(), get_date_time(), $country, $gender,$dob, $site_config["default_theme"], $site_config["default_language"], $signupclass, getip()))).")");
$message="yes";
}
echo "$message";
break;