Export to Excel from html data using PHP - php

Question

I have displayed a table of data from MYSQL DB. I have a button to export to excel. When I click on the button the excel file is created but it is empty or sometimes nothing is happening. What could be wrong here?
I have code like below:
view.php:
<div id="div_users">
<table class="table table-striped">
<thead class="thead-dark">
<tr>
<th class="mn_th01">#</th>
<th class="mn_th02">Date</th>
<th class="mn_th03">Name</th>
<th class="mn_th04">Place</th>
<th class="mn_th05">Notes</th>
<th class="mn_th06">Sales Exec.</th>
<th class="mn_th07">Image</th>
</tr>
</thead>
<tbody>
<?php
date_default_timezone_set('Asia/Kolkata');
$date = date('d/m/Y', time());
echo $date . "\n";
$count=1;
$query = "SELECT * FROM ua_myadd_details WHERE STR_TO_DATE(notes_date,'%d/%m/%y') = STR_TO_DATE('$date', '%d/%m/%y') ORDER BY M.id DESC";
$result = mysqli_query($bd,$query);
if(mysqli_num_rows($result) > 0)
{
while($row = mysqli_fetch_assoc($result)) {
?>
<tr>
<td><?php echo $count; ?></td>
<td><?php echo $row["notes_date"]; ?></td>
<td><?php echo $row["firstname"] . " " . $row["lastname"]; ?></td>
<td><?php echo $row["city"]; ?></td>
<td><?php echo $row["notes"]; ?></td>
<td><?php echo $row["executive"]; ?></td>
</tr>
<?php $count++; }
}
else
{?>
<tr>
<td colspan="7">
<?php echo "No Data Found"; ?>
</td>
</tr>
<?php } ?>
</tbody>
</table>
</div>
I have a button like this:
<div class="col-md-3">
<button name="create_excel" id="create_excel" class="btn btn-success btn-block"><i class="fas fa-arrow-alt-circle-down"></i> Export to Excel</button>
</div>
In the script I have written:
<script>
$(document).ready(function(){
$('#create_excel').click(function(){
var excel_data = $('#div_users').html();
var page = "export.php?data=" + excel_data;
window.location = page;
});
});
</script>
export.php:
<?php
header('Content-Type: application/vnd.ms-excel');
header('Content-disposition: attachment; filename='.rand().'.xls');
echo $_GET["data"];
?>