Javascript 如何使用ajax检查数据库中已经存在的电子邮件?
我正在寻找一个代码,用于获取ajax响应,以检查数据库中是否已经输入了电子邮件地址。这是我的代码片段 Java脚本:Javascript 如何使用ajax检查数据库中已经存在的电子邮件?,javascript,php,jquery,ajax,Javascript,Php,Jquery,Ajax,我正在寻找一个代码,用于获取ajax响应,以检查数据库中是否已经输入了电子邮件地址。这是我的代码片段 Java脚本: <script type="text/javascript"> pic1 = new Image(16, 16); pic1.src="img/loader.gif"; $(document).ready(function(){ $("#email").change(function() { var usr = $("#email").val(); if(us
<script type="text/javascript">
pic1 = new Image(16, 16);
pic1.src="img/loader.gif";
$(document).ready(function(){
$("#email").change(function() {
var usr = $("#email").val();
if(usr.length >= 4)
{
$("#status").html('<img style="width:17px;" src="img/loader.gif" align="absmiddle"> Checking availability...');
$.ajax({
type: "POST",
url: "check.php",
data: "email="+ usr,
success: function(msg){
$("#status").ajaxComplete(function(event, request, settings){
if(msg == 'OK')
{
alert ("error");
$("#email").removeClass('object_error'); // if necessary
$("#email").addClass("object_ok");
$(this).html(' <img src="tick.gif" align="absmiddle">');
}
else
{
$("#email").removeClass('object_ok'); // if necessary
$("#email").addClass("object_error");
$(this).html(msg);
}
});
}
});
}
else
{
$("#status").html('<font color="red">' +
'Enter Valid Email</font>');
$("#email").removeClass('object_ok'); // if necessary
$("#email").addClass("object_error");
}
});
});
</script>
pic1=新图像(16,16);
pic1.src=“img/loader.gif”;
$(文档).ready(函数(){
$(“#电子邮件”).change(函数(){
var usr=$(“#email”).val();
如果(usr.length>=4)
{
$(“#状态”).html(‘检查可用性…’);
$.ajax({
类型:“POST”,
url:“check.php”,
数据:“email=“+usr,
成功:函数(msg){
$(“#状态”).ajaxComplete(功能(事件、请求、设置){
如果(msg=='OK')
{
警报(“错误”);
$(“#email”).removeClass('object#error');//如有必要
$(“#email”).addClass(“object#ok”);
$(this.html(“”);
}
其他的
{
$(“#email”).removeClass('object#ok');//如有必要
$(“电子邮件”).addClass(“对象错误”);
$(this.html(msg);
}
});
}
});
}
其他的
{
$(“#状态”).html(“”+
“输入有效电子邮件”);
$(“#email”).removeClass('object#ok');//如有必要
$(“电子邮件”).addClass(“对象错误”);
}
});
});
我的Check.php文件如下
<?php
// This is a sample code in case you wish to check the username from a mysql db table
if(isSet($_POST['email'])) {
$email = $_POST['email'];
$dbHost = 'localhost'; // usually localhost
$dbUsername = 'root';
$dbPassword = '';
$dbDatabase = 'jaquar_cdb';
$db = mysql_connect($dbHost, $dbUsername, $dbPassword)
or die ("Unable to connect to Database Server.");
mysql_select_db ($dbDatabase, $db)
or die ("Could not select database.");
$sql_check = mysql_query("select email from jaquar_contest where email='".$email."'")
or die(mysql_error());
if(mysql_num_rows($sql_check)) {
echo '<font color="red">The email <strong>'.$email.'</strong>'.
' is already in use.</font>';
} else {
echo 'OK';
}
}
?>
将第一行php代码更改为:
if(设置($\u POST['email'])
因此,更新的Check.php文件:
<?php
// This is a sample code in case you wish to check the username from a mysql db table
if(isset($_POST['email'])) {
$email = $_POST['email'];
$dbHost = 'localhost'; // usually localhost
$dbUsername = 'root';
$dbPassword = '';
$dbDatabase = 'jaquar_cdb';
$db = mysql_connect($dbHost, $dbUsername, $dbPassword)
or die ("Unable to connect to Database Server.");
mysql_select_db ($dbDatabase, $db)
or die ("Could not select database.");
$sql_check = mysql_query("select email from jaquar_contest where email='".$email."'")
or die(mysql_error());
if(mysql_num_rows($sql_check)) {
echo '<font color="red">The email <strong>'.$email.'</strong>'.
' is already in use.</font>';
} else {
echo 'OK';
}
}
?>
将第一行php代码更改为:
if(设置($\u POST['email'])
因此,更新的Check.php文件:
<?php
// This is a sample code in case you wish to check the username from a mysql db table
if(isset($_POST['email'])) {
$email = $_POST['email'];
$dbHost = 'localhost'; // usually localhost
$dbUsername = 'root';
$dbPassword = '';
$dbDatabase = 'jaquar_cdb';
$db = mysql_connect($dbHost, $dbUsername, $dbPassword)
or die ("Unable to connect to Database Server.");
mysql_select_db ($dbDatabase, $db)
or die ("Could not select database.");
$sql_check = mysql_query("select email from jaquar_contest where email='".$email."'")
or die(mysql_error());
if(mysql_num_rows($sql_check)) {
echo '<font color="red">The email <strong>'.$email.'</strong>'.
' is already in use.</font>';
} else {
echo 'OK';
}
}
?>
为什么没有得到任何响应的问题就在这里
我不知道你为什么要用它,但你可以不用它,事实上,即使你的方法不需要它
没有Ajaxcomplete功能时
对代码进行了一些更改
pic1 = new Image(16, 16);
pic1.src="img/loader.gif";
$(document).ready(function(){
$("#email").change(function() {
var usr = $("#email").val();
if(usr.length >= 4){
$("#status").html('<img style="width:17px;" src="img/loader.gif" align="absmiddle"> Checking availability...');
$.ajax({
type: "POST",
url: "check.php",
data: "email="+ usr,
dataType: 'text',
success: function(msg){
if(msg == 'OK'){
alert ("success");
$("#email").removeClass('object_error'); // if necessary
$("#email").addClass("object_ok");
$("#status").html(' <img src="tick.gif" align="absmiddle">');
} else {
alert ("error");
$("#email").removeClass('object_ok'); // if necessary
$("#email").addClass("object_error");
$("#status").html(msg);
}
}
});
} else {
$("#status").html('<font color="red">' + 'Enter Valid Email</font>');
$("#email").removeClass('object_ok'); // if necessary
$("#email").addClass("object_error");
}
});
});
pic1=新图像(16,16);
pic1.src=“img/loader.gif”;
$(文档).ready(函数(){
$(“#电子邮件”).change(函数(){
var usr=$(“#email”).val();
如果(usr.length>=4){
$(“#状态”).html(‘检查可用性…’);
$.ajax({
类型:“POST”,
url:“check.php”,
数据:“email=“+usr,
数据类型:“文本”,
成功:功能(msg){
如果(msg=='OK'){
警惕(“成功”);
$(“#email”).removeClass('object#error');//如有必要
$(“#email”).addClass(“object#ok”);
$(“#状态”).html(“”);
}否则{
警报(“错误”);
$(“#email”).removeClass('object#ok');//如有必要
$(“电子邮件”).addClass(“对象错误”);
$(“#status”).html(msg);
}
}
});
}否则{
$(“#状态”).html(“+”输入有效电子邮件);
$(“#email”).removeClass('object#ok');//如有必要
$(“电子邮件”).addClass(“对象错误”);
}
});
});
旁注:已弃用,因此应停止使用它并开始使用MySQLi
<?php
// This is a sample code in case you wish to check the username from a mysql db table
if(isset($_POST['email'])) { //change isSet to isset (it will not make any difference)
$email = mysql_real_escape_string($_POST['email']); //escape the string
$dbHost = 'localhost'; // usually localhost
$dbUsername = 'root';
$dbPassword = '';
$dbDatabase = 'jaquar_cdb';
$db = mysql_connect($dbHost, $dbUsername, $dbPassword)
or die ("Unable to connect to Database Server.");
mysql_select_db ($dbDatabase, $db)
or die ("Could not select database.");
$sql_check = mysql_query("SELECT email FROM jaquar_contest WHERE email='$email'") or die(mysql_error());
if(mysql_num_rows($sql_check) > 0) { //check rows greater then zero (although it will also not make any difference)
echo '<font color="red">The email <strong>'.$email.'</strong>'. ' is already in use.</font>';
} else {
echo 'OK';
}
}
?>
为什么没有得到任何响应的问题就在这里
我不知道你为什么要用它,但你可以不用它,事实上,即使你的方法不需要它
没有Ajaxcomplete功能时
对代码进行了一些更改
pic1 = new Image(16, 16);
pic1.src="img/loader.gif";
$(document).ready(function(){
$("#email").change(function() {
var usr = $("#email").val();
if(usr.length >= 4){
$("#status").html('<img style="width:17px;" src="img/loader.gif" align="absmiddle"> Checking availability...');
$.ajax({
type: "POST",
url: "check.php",
data: "email="+ usr,
dataType: 'text',
success: function(msg){
if(msg == 'OK'){
alert ("success");
$("#email").removeClass('object_error'); // if necessary
$("#email").addClass("object_ok");
$("#status").html(' <img src="tick.gif" align="absmiddle">');
} else {
alert ("error");
$("#email").removeClass('object_ok'); // if necessary
$("#email").addClass("object_error");
$("#status").html(msg);
}
}
});
} else {
$("#status").html('<font color="red">' + 'Enter Valid Email</font>');
$("#email").removeClass('object_ok'); // if necessary
$("#email").addClass("object_error");
}
});
});
pic1=新图像(16,16);
pic1.src=“img/loader.gif”;
$(文档).ready(函数(){
$(“#电子邮件”).change(函数(){
var usr=$(“#email”).val();
如果(usr.length>=4){
$(“#状态”).html(‘检查可用性…’);
$.ajax({
类型:“POST”,
url:“check.php”,
数据:“email=“+usr,
数据类型:“文本”,
成功:功能(msg){
如果(msg=='OK'){
警惕(“成功”);
$(“#email”).removeClass('object#error');//如有必要
$(“#email”).addClass(“object#ok”);
$(“#状态”).html(“”);
}否则{
警报(“错误”);
$(“#email”).removeClass('object#ok');//如有必要
$(“电子邮件”).addClass(“对象错误”);
$(“#status”).html(msg);
}
}
});
}否则{
$(“#状态”).html(“+”输入有效电子邮件);
$(“#email”).removeClass('object#ok');//如有必要
$(“电子邮件”).addClass(“对象错误”);
}
});
});
旁注:已弃用,因此应停止使用它并开始使用MySQLi
<?php
// This is a sample code in case you wish to check the username from a mysql db table
if(isset($_POST['email'])) { //change isSet to isset (it will not make any difference)
$email = mysql_real_escape_string($_POST['email']); //escape the string
$dbHost = 'localhost'; // usually localhost
$dbUsername = 'root';
$dbPassword = '';
$dbDatabase = 'jaquar_cdb';
$db = mysql_connect($dbHost, $dbUsername, $dbPassword)
or die ("Unable to connect to Database Server.");
mysql_select_db ($dbDatabase, $db)
or die ("Could not select database.");
$sql_check = mysql_query("SELECT email FROM jaquar_contest WHERE email='$email'") or die(mysql_error());
if(mysql_num_rows($sql_check) > 0) { //check rows greater then zero (although it will also not make any difference)
echo '<font color="red">The email <strong>'.$email.'</strong>'. ' is already in use.</font>';
} else {
echo 'OK';
}
}
?>
不客气,别忘了将答案标记为正确:)不客气,别忘了将答案标记为正确:)