How to pass data-id to modal - php

Question

I send an id from the database to the button. I can't send the id to modal inpıt. I tried so hard, but I couldn't.
Modal:
<div class="modal fade" id="delete">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span></button>
<h4 class="modal-title"><b>Deleting.</b></h4>
</div>
<div class="modal-body">
<form class="form-horizontal" method="POST" action="advert_delete.php">
<input type=""class="id" name="id">
<div class="text-center">
<p>DELETE </p>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default btn-flat pull-left" data-dismiss="modal"><i class="fa fa-close"></i> Close</button>
<button type="submit" class="btn btn-danger btn-flat" name="delete_button"><i class="fa fa-trash"></i> Delete</button>
</div>
</form>
</div>
</div>
Buton and Script:
<button type='button' class='btn btn-danger btn-sm delete btn-flat' data-id='".$row['id']."' ><i class='fa fa-trash'></i> Delete</button>
$(document).on('click', '.delete', function(e){
e.preventDefault();
var id = $(this).attr('data-id');
$("id").val(id);
$('#delete').modal('show');
});

Answer 1

The following input field:
<input class="id" name="id" id="id">
Can be called in the following ways:
$(".id") // Calling *any* element with class="id"
$("input[name=id]") //Calling *any* _input_ element that has name="id"
$("#id") // Calling the element with id="id"
In your particular example, your field doesn't include the id attribute, so you cannot use #id as a reference (Unless you add the id attribute of course). But the other two methods should work.