Cordova jquery ajax post to server php file - php

Question

I want to compare input value of the input in the cordova app to an table in my database.
This is my jquery ajax post:
$('.postToken').click(function(){
console.log($('.valueToken').val());
var tokenValue = $('.valueToken').val();
$.ajax({
type: "POST",
url: "http://example.com/fysioWebapp/php/get_schema.php",
data: { dataString: tokenValue },
cache: false,
success: function(){
alert("Order Submitted");
}
});
and this is my get_schema.php on server:
<?php
include("connect.php");
$stringData = $_POST['dataString'];
ini_set('display_errors', 1);
var_dump($stringData);
?>
But it returns me null I first type in value data in my cordova app and then refresh the php page but keeps returning me null. Could somebody help me out on this issue?

Answer 1

Edit:
You need to see if the value exists in the database table like this
<?php
include("connect.php");
$stringData = $_POST['dataString'];
ini_set('display_errors', 1);
$checkToken = "SELECT * FROM Exercises WHERE YOUR_FIELD_NAME = ('$stringData')";
$checkResult = mysqli_query($conn, $checkToken);
if (mysqli_num_rows($checkResult) > 0) {
echo "Result already exists";
} else {
echo "0 results";
}
?>
Replace YOUR_FIELD_NAME for the column name you use for tokens.
The javascript I have already provided will console log wether or not the token exists.
Original
When you refresh the php file $stringData will be undefined.
Try this.
$('.postToken').click(function(){
console.log($('.valueToken').val());
var tokenValue = $('.valueToken').val();
$.ajax({
type: "POST",
url: "http://example.com/fysioWebapp/php/get_schema.php",
data: { dataString: tokenValue },
cache: false,
success: function(data){
console.log(data);
alert("Order Submitted");
}
});
});
This should console log the result of the var_dump.
If not change this line of the php file.
var_dump($stringData);
To.
echo var_dump($stringData);

Answer 2

You cannot just use ajax in your cordova app because of cross domain issues. Either you have to setup your server or php to get it or you can use jsonp.
For ajax solution you can try this on your php:
<?php
header("Access-Control-Allow-Origin: " . $_SERVER["HTTP_ORIGIN"]);
header("Access-Control-Allow-Methods: POST");
header("Access-Control-Allow-Credentials: true");
header("Access-Control-Allow-Headers: origin, referer, content-type");
header("Access-Control-Max-Age: 1728000");
if(strtoupper($_SERVER['REQUEST_METHOD']) == 'OPTIONS'){
header("Content-Type: text/plain");
header("Content-Length: 0");
http_response_code(204);
exit;
}
include("connect.php");
$stringData = $_POST['dataString'];
ini_set('display_errors', 1);
var_dump($stringData);
?>