我使用Phonegap创建了一个android应用程序。我在000webhost上创建了一个帐户，并在服务器上添加了我的PHP文件。在phpMyAdmin中，我已经创建了我的数据库。
现在，我尝试将我的项目与在线数据库连接，并在其中插入或检查一些数据。
问题：
-
当我在手机中运行应用程序时，我从ajax中的
success: ...部分代码中收到此警报：There is no such username
（我的PHP在评论中有所有的echo，除了：echo json_encode） -
当我在PHP中从ajax获取
$username并运行我的应用程序后添加此行（var_dump($_POST);）时，我看到了以下警报：array(1){ ['"username'"]=> string(2) '"hi"'" } -
当我添加这些行：
if (empty($username)) { echo '...' }时，在我运行应用程序后，我看到在ajax的error: ...部分内的警报中，它打印了该if内的echo。因此，$username肯定是空的。
这是我的
JavaScript文件：（我确信
html中的所有值都是正确的，所以请关注代码的两个Ajax部分）
document.addEventListener("deviceready", onDeviceReady, false);
// PhoneGap is ready
function onDeviceReady() {
var el = document.getElementById("register");
el.addEventListener("click", Register, false);
}
function Register() {
var username = document.getElementsByName('username')[0];
var password = document.getElementsByName('password')[0];
var email = document.getElementsByName('email')[0];
var strong_flag_user = 0;
var user = username.value;
if (username.value == "") {
$("#username").focus();
document.getElementById('username').style.boxShadow = "0 0 7px #f00";
navigator.notification.vibrate(500);
}
else{
$.ajax({
url: "http://www.guidemeforall.freeiz.com/phps/check_for_dublicates/check_username.php",
type: "POST",
crossDomain: true,
data: { username: user },
dataType:'json',
success: function(response){
if (response.status == 'success') {
alert(response.message);
document.getElementById('username').style.boxShadow = "none";
strong_flag_user = 1;
}
else if (response.status == 'error') {
alert(response.message);
navigator.notification.alert("This username is already taken! Please use another one!", null, 'Username', 'Okay');
document.getElementById('username').style.boxShadow = "0 0 7px #f00";
navigator.notification.vibrate(500);
strong_flag_user = 0;
//window.location("main.html");
}
else {
alert("error");
strong_flag_user = 0;
}
},
error: function(error){ //function(error){
alert(JSON.stringify(error));
strong_flag_user = 0;
//window.location = "main.html";
}
});
}
//>5 characters, 1 upper case, at least 1 lower case, at least 1 numerical character, at least 1 special character
var passExp = /(?=^.{6,15}$)((?=.*'d)(?=.*[A-Z])(?=.*[a-z])|(?=.*'d)(?=.*[^A-Za-z0-9])(?=.*[a-z])|(?=.*[^A-Za-z0-9])(?=.*[A-Z])(?=.*[a-z])|(?=.*'d)(?=.*[A-Z])(?=.*[^A-Za-z0-9]))^.*/;
var strong_flag_pass = 0;
if (!(password.value.match(passExp))) {
$("#password").focus();
document.getElementById('password').style.boxShadow = "0 0 7px #f00";
navigator.notification.alert("Please enter a strong Password! It has to have at least: 6 characters, 1 upper case, 1 lower case, 1 numerical character and 1 special character!", null, 'Password', 'Okay');
navigator.notification.vibrate(500);
strong_flag_pass = 0;
}
else{
document.getElementById('password').style.boxShadow = "none";
strong_flag_pass = 1;
}
var emailExp = /^.+@[^'.].*'.[a-z]{2,}$/;
var strong_flag_email = 0;
if (!(email.value.match(emailExp))) {
$("#email").focus();
document.getElementById('email').style.boxShadow = "0 0 7px #f00";
navigator.notification.alert("Please enter a correct Email!", null, 'Email', 'Okay');
navigator.notification.vibrate(500);
strong_flag_email = 0;
}
else {
document.getElementById('email').style.boxShadow = "none";
strong_flag_email = 1;
}
var gender;
if (document.getElementById("gender").value == "female")
gender = 'F';
else
gender = 'M';
var about_you = document.getElementById("about_you").value;
var age = document.getElementById("radio-choice").value;
if (document.getElementById('radio-choice-1').checked) {
age = document.getElementById('radio-choice-1').value;
}
else if (document.getElementById('radio-choice-2').checked) {
age = document.getElementById('radio-choice-2').value;
}
else if (document.getElementById('radio-choice-3').checked) {
age = document.getElementById('radio-choice-3').value;
}
else if (document.getElementById('radio-choice-4').checked) {
age = document.getElementById('radio-choice-4').value;
}
else if (document.getElementById('radio-choice-5').checked) {
age = document.getElementById('radio-choice-5').value;
}
else if (document.getElementById('radio-choice-6').checked) {
age = document.getElementById('radio-choice-6').value;
}
if (strong_flag_user == 1 && strong_flag_pass == 1 && strong_flag_email == 1){
//add to db
register_db(email.value, password.value, username.value, gender, about_you, age);
}
}
function register_db(em, pass, user, gend, about, ag) {
$.ajax({
url: "http://www.guidemeforall.freeiz.com/phps/sign-up.php",
type: "POST",
crossDomain: true,
data: { username:user, password:pass, email:em, gender:gend, about_you:about, age:ag },
dataType:'json',
success: function(data)
{
if (data.status == 'success')
{
alert("Success!");
}
else if (data.status == 'error')
{
alert("Failure!");
}
}
});
}
这是我的
PHP文件，我在其中检查用户名是否已经存在（用户名=主键）：
<?php
header('Content-type: application/json');
header('Access-Control-Allow-Origin: *');
//require_once('../database_config.php');
$server = "my***.000webhost.com";
$database = "a1****37_guideme";
$username = "a1****37_guideme";
$password = "*****";
$con = mysql_connect($server, $username, $password);
// if($con) { //echo "Connected to database!"; }
// else { //echo "Could not connect!"; }
mysql_select_db($database, $con);
$topost = file_get_contents('php://input');
$thedata = json_decode($topost, true);
$username = $thedata['username'];
//var_dump($_POST);
//if (empty($username)) {
// echo 'The username is either 0, empty, or not set at all';
//}
$sql = "SELECT COUNT(*) as Count FROM `user` WHERE `username`='$username'";
$result= mysql_query($sql, $con);
$rows = mysql_fetch_array($result);
$count = $rows['Count'];
if (!$result) {
die('Error: ' . mysql_error());
//$response_array['status'] = 'error';
//echo json_encode($response_array);
}
else {
if ($count == 0) {
echo json_encode(array('status' => 'success','message'=> 'There is no such username'));
//$response_array['status'] = 'success';
//echo json_encode($response_array);
}
else
{
echo json_encode(array('status' => 'error','message'=> 'The username already exists'));
//$response_array['status'] = 'error';
//echo json_encode($response_array);
}
}
mysql_close($con);
?>
这是我试图在数据库中插入新条目的
PHP文件（我的凭据肯定是正确的）：
<?php
header('Content-type: application/json');
header('Access-Control-Allow-Origin: *');
//require_once('database_config.php');
$server = "mys****.000webhost.com";
$database = "a***37_guideme";
$username = "a***37_guideme";
$password = "******";
$con = mysql_connect($server, $username, $password);
// if($con) { //echo "Connected to database!"; }
// else { //echo "Could not connect!"; }
mysql_select_db($database, $con);
$topost = file_get_contents('php://input');
$thedata = json_decode($topost, true);
$username = $thedata['username'];
$password = $thedata['password'];
$email = $thedata['email'];
$gender = $thedata['gender'];
$age = $thedata['age'];
$about_you = $thedata['about_you'];
$sql = "INSERT INTO user (username, password, email, gender, age, about_you) ";
$sql .= "VALUES ('$username', '$password', '$email', '$gender', '$age', '$about_you')";
if (!mysql_query($sql, $con)) {
die('Error: ' . mysql_error());
// $response_array['status'] = 'error';
// echo json_encode($response_array);
}
else {
echo json_encode(array('status' => 'success','message'=> 'No problem'));
// $response_array['status'] = 'success';
// echo json_encode($response_array);
}
mysql_close($con);
?>
我的问题通过将我在PHP中获取数据的方式更改为->$user = $_POST['username'];而不是Json（json_decode e.t.c.）来解决。