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How to disable modal button if displayed cart item is empty?

Im still learning PHP and Javascript. I display my cart item using modal but I don't have any idea how to disable the modal button if the displayed cart item is empty.
<div class="modal fade bd-example-modal-lg" id="cartmodal" tabindex="-1" data-target=".bd-example-modal-lg" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog modal-lg" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">Lihat Bahan Arkib</h5>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<table class="table table-secondary" id="cart_table" style="width: 100%;">
<thead class="">
<tr class="">
<th>No.Rujukan & No.Penerimaan</th>
<th>Tajuk</th>
<th>Tindakan</th>
</tr>
</thead>
<tbody id='cartBody'>
<?php if (isset($_SESSION['cart'])) {
foreach($_SESSION['cart'] as $k => $v){ ?>
<tr id="view-cart">
<td><?php echo $v['id_arkib'] ?> </td>
<td><?php echo $v['tajuk']?> </td>
<td><button class="btn btn-danger mdi mdi-delete deleteitem" required>Padam</button></td>
</tr>
<?php }
}?>
</tbody>
</table>
</div>
<div class="modal-footer">
<a type="submit" class="btn btn-primary" id="btn-mohon-cart" name="mohonbtn" href="<?php echo ROOT_PATH; ?>pusat_sumber/penyelidik/permohonan_penyelidik.php">Mohon</a>
</div>
</div>
</div>
</div>

in javascript:
<button type="button" class="close" data-dismiss="modal" aria-label="Close" disabled={cart.length > 0 ? false : true}>

Issue passing table row data to bootstrap modal

I've gone through several examples but for some reason I'm unable to get data from my table to pass to my modal. I could use some expert guidance.
Table row is dynamically populated and looks like this:
<tr data-toggle="modal" data-target="#myModal" style="cursor: pointer" data-id="<?php echo $site_info['site_id']; ?>">
<td><?php echo $site_info['site_id']; ?></td>
...
The modal and JS are below:
<div id="myModal" class="modal fade" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true" style="display: none;">
<div class="modal-dialog" style="width:55%;">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title" id="myModalLabel">Site Information</h4>
</div>
<div class="modal-body">
<div id="siteDetails">asdf</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div><!-- /.modal-content -->
</div><!-- /.modal-dialog -->
</div><!-- /.modal -->
<script>
$(document).ready(function() {
$('#myModal').on('show.bs.modal', function(event) {
var getId = $(event.relatedTarget).data('id');
$("#siteDetails").html('Selected: ' + getId);
});
});
</script>
How can I make sure that the #siteDetails div gets updated?
Thanks!

Show data based of selected id on modal popup window after click a button php mysql

On my website, when the button is clicked, it will prompt to a popup window. Im using the modal popup window. My problem is, I cant get the right data that being retrieved based on the id of the button. Below is my code:
The html table:
<tbody>
<?php
$counter = 1;
$data = "SELECT * FROM family";
$result = $conn->query($data);
while($ser=mysqli_fetch_array($result))
{
?>
<tr>
<td><center><?php echo $counter;
$counter++; ?></center></td>
<td><center><?php echo $ser['fam_id'];?></center></td>
<td><center><?php echo $ser['fam_name']; ?></center></td>
<td><center><button class="btn btn-primary btn-sm" data-toggle="modal" data-target="#myModal" data-id=<?php echo $ser['fam_id'];?>>Edit Attendance Status</button></center>
The fam_id is the primary key.
Then, below is the code for modal popup window
<!-- Modal -->
<form id="form1" method="post">
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">×</span><span class="sr-only">Close</span></button>
<h4 class="modal-title" id="fam_id">Name <?php echo $ser['fam_name'];?></h4>
</div>
<div class="modal-body">
<b>Details</b>
<hr></hr>
Address: <?php echo $ser['fam_add']; ?><p></p>
Phone_num: <?php echo $ser['fam_phone']; ?><p></p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
</form>
Moreover, Im doing them in one file. In conclusion, it is like below:
<tbody>
<?php
$counter = 1;
$data = "SELECT * FROM family";
$result = $conn->query($data);
while($ser=mysqli_fetch_array($result))
{
?>
<tr>
<td><center><?php echo $counter;
$counter++; ?></center></td>
<td><center><?php echo $ser['fam_id'];?></center></td>
<td><center><?php echo $ser['fam_name']; ?></center></td>
<td><center><button class="btn btn-primary btn-sm" data-toggle="modal" data-target="#myModal" data-id=<?php echo $ser['fam_id'];?>>Edit Attendance Status</button></center>
<!-- Modal -->
<form id="form1" method="post">
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">×</span><span class="sr-only">Close</span></button>
<h4 class="modal-title" id="fam_id">Name <?php echo $ser['fam_name'];?></h4>
</div>
<div class="modal-body">
<b>Details</b>
<hr></hr>
Address: <?php echo $ser['fam_add']; ?><p></p>
Phone_num: <?php echo $ser['fam_phone']; ?><p></p>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
</form>
</td>
</tr>
<?php
}
?>
</tbody>

<tbody>
<?php
$counter = 1;
$data = "SELECT * FROM family";
$result = $conn->query($data);
while($ser=mysqli_fetch_array($result))
{
?>
<tr>
<td><center><?php echo $counter; $counter++; ?></center></td>
<td><center><?php echo $ser['fam_id'];?></center></td>
<td><center><?php echo $ser['fam_name']; ?></center></td>
<td>
<center>
<a class="modalLink" href="#myModal" data-toggle="modal" data-target="#myModal" data-id="<?php echo $ser["fam_id"]; ?>" data-addr="<?php echo $ser['fam_add']; ?>" data-phone="<?php echo $ser['fam_phone']; ?>" data-name="<?php echo $ser['fam_name']; ?>">
<button class="btn btn-primary btn-sm">
Edit Attendance Status
</button>
</a>
</center>
Place this code in footer.php or end of this page.
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
</div>
</div>
</div>
Call your 'somepage.php' (Separate page.Where modal-body is present) through ajax. Place this <script></script> in your JS file.
<script>
$('.modalLink').click(function(){
var famID=$(this).attr('data-id');
var famAddr=$(this).attr('data-addr');
var famPhone=$(this).attr('data-phone');
var famName=$(this).attr('data-name');
$.ajax({url:"somepage.php?famID="+famID+"&famAddr="+famAddr+"&famPhone="+famPhone+"&famName="+famName,cache:false,success:function(result){
$(".modal-content").html(result);
}});
});
</script>
somepage.php
Create somepage.php (If you want to change this page name. Change in <script></script> too. Both are related.)
<?
$famID=$_GET['famID'];
$famAddr=$_GET['famAddr'];
$famPhone=$_GET['famPhone'];
$famName=$_GET['famName'];
?>
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal"><span aria-hidden="true">×</span><span class="sr-only">Close</span></button>
<h4 class="modal-title" id="fam_id">Name <?php echo $famName;?></h4>
</div>
<div class="modal-body">
<form id="form1" method="post">
<b>Details</b>
<hr></hr>
Address: <p><?php echo $famAddr;?></p>
Phone_num: <p><?php echo $famPhone;?></p>
</form>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>

Pass a row ID from one section of the Page to another

I would like to pass an row ID from one section of the page to another in the following way:
The user will click on the trash can and a delete confirmation message will come up. The following code shows how I retrieve the list from the database:
<?php while($row = mysql_fetch_array($query_set)) { ?>
<tr>
<td><?php echo $row['cover_name'] ?></td>
<td><?php echo 'R '.$row['sum_insured'] ?></td>
<td><?php echo $row['info'] ?></td>
<td>
<i class="fa fa-pencil"></i>
<i class="fa fa-trash-o"></i><!-- This is the link for the trash can to pass the id -->
</td>
</tr>
<?php } ?>
After clicking on the following <i class="fa fa-trash-o"></i><!-- This is the link for the trash can to pass the id -->
The following pop will come up:
and it has the following code:
<div class="modal small fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h3 id="myModalLabel">Delete Confirmation</h3>
</div>
<div class="modal-body">
<p class="error-text"><i class="fa fa-warning modal-icon"></i>Are you sure you want to delete the cover?<br>This cannot be undone.</p>
</div>
<div class="modal-footer">
<button class="btn btn-default" data-dismiss="modal" aria-hidden="true">Cancel</button>
<a href="delete-cover.php?id=<?php echo $coverid ?>" class="btn btn-danger" >Delete</a><!-- I would like to pass the id from that trash can button this the delete button -->
</div>
</div>
</div>
</div>
I would like to pass the id from the trash can link to the delete button that pops up. Any assistance will be appreciated

This is surely not good:
onclick="<?php $coverid = $row['coverid'] ?>"
It should be somethig like that:
onclick="jsfunctionname(<?php echo $row['coverid'];?>);"
Or if you use jQuery on selector, then add a data-id="<?php echo $row['coverid'];?>" to the link, and get like $(this).data('id');

twitter bootstrap modal works with js only once

Implemented in PHP using Codeigniter, I am using Twitter Bootstrap Modal for my project. The goal is that when I click the modal, an entry form for the name will appear. Fortunately, the modal gets the data I need (i.e. the name of the community). However, when I load the modals one by one, it is only in the first modal that my code here works:
Here are my codes inside my view page together with the codes linked above:
//..code here
<?php foreach ($name_list as $list) { ?>
modal trigger
<img class="pointer" title="Edit" src="pic.png" data-toggle="modal" data-target="<?php echo "#" . $list->name?>"/> <?php echo $list->name?>
modal
<div class="modal fade bs-example-modal-sm" id="<?php echo $list->name ?>" tabindex="-1" role="dialog" aria-labelledby="mySmallModalLabel" aria-hidden="true">
<div class="modal-dialog modal-sm">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title" id="myModalLabel">Edit <?php echo $list->name?></h4>
</div>
<form action="<?php echo base_url();?>edit" method="post">
<div class="modal-body">
<b><p id="warning"></p></b>
<input name="edit-name" id="edit-name" type="text" placeholder="Name" value="<?php echo $list->name?>"/>
<input name="edit-id" type="text" value="<?php echo $list->id?>" class="hidden"/>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
<input type="submit" id="edit-btn" disabled="true" class="btn btn-primary" value="Save changes" />
</div>
</form>
</div>
</div>
</div>
What is wrong with my code? Why does my JS code work only once?