Retrieve database data using PHP and AJAX - php

Question

I am trying to retrieve data from database using AJAX without any success. These are the codes I am using. I dont see any specific errors in console.
HTML:
<button type="button" name="result_submit" id="result_submit" >Submit</button>
<div class="result" id="result" name="result"> </div>
Jquery:
$(document).ready(function(e) {
$('#result_submit').click(function() {
$.ajax({
url :"Income.php",
type :'POST',
success: function(data){
$("#result").html(data);
}
});
});
});
Income.php content:
<?php
include_once 'dbConnection.php';
$stmt = mysqli_stmt_init($conn);
$income = "select SUM(amount) as incomeNumber FROM wp_formdata WHERE entry_type='Income'";
if(!mysqli_stmt_prepare($stmt,$income))
{
$message = '<h1 style="color:red;padding-top:5%;">SQL Error !!</h1>';
}
else
{
mysqli_stmt_execute($stmt);
$result= mysqli_stmt_get_result($stmt);
$income_sum=mysqli_fetch_assoc($result);
$TotIncome= "Total Income is ".$income_sum['incomeNumber'];
}
?>
dbConnection.php has connections details:
<?php
$dbServername = "localhost";
$dbUsername = "root";
$dbPassword = "";
$dbName = "wordpress";
$conn= mysqli_connect($dbServername, $dbUsername, $dbPassword, $dbName);
?>
Can someone guide me how to resolve the issue

Answer 1

You need to echo your data from your PHP file :
$income = "select SUM(amount) as incomeNumber FROM wp_formdata WHERE entry_type='Income'";
$response = '';
if (! mysqli_stmt_prepare($stmt,$income)) {
$response = '<h1 style="color:red;padding-top:5%;">SQL Error !!</h1>';
} else {
mysqli_stmt_execute($stmt);
$result = mysqli_stmt_get_result($stmt);
$income_sum = mysqli_fetch_assoc($result);
$response = "Total Income is ".$income_sum['incomeNumber'];
}
echo $response;

Answer 2

First off all add on the beginig of page:
error_reporting(E_ERROR | E_WARNING | E_PARSE);
ini_set('error_reporting', E_ALL);
and
printf("Errormessage: %s\n", mysqli_error($income_sum));
afther query to db.
Do you have any respons from the page called by ajax?

Answer 3

The script that you call using AJAX doesn't render anything.
echo $TotIncome;