multiple <select> dropdown as sql parameters | PHP - php

Question

I have a running code that does sql query based on 1 <select> dropdown value. May I ask how will I be able to do multiple query parameters using 2 or more <select> dropdown?
Example. I sorted my data based on accounttitle now I want to sort accountttitle by YEAR(datedue), how will I do this?
This is what I got so far.
For isset()
if(isset($_GET['accounttitle'])){
$accounttitle = $_GET['accounttitle'];
$year = date('Y');
if(isset($_GET['year'])){
$year = $_GET['year'];
}
else "PLEASE SELECT OPTION";
}
?>
For <select>
<div class="col-sm-9">
<select class="form-control" id="select_account_title" style="text-transform:uppercase" required>
<option value="">PLEASE SELECT OPTION</option>
<?php while ($row = sqlsrv_fetch_array($query, SQLSRV_FETCH_ASSOC)): ?>
<option value="<?= urlencode($row['accounttitle'])?>"><?= $row['accounttitle'] ?></option>
<?php endwhile; ?>
</select>
<label>Select Year: </label>
<select class="form-control input-sm" id="select_year">
<?php
for($i=2013; $i<=2033; $i++){
$selected = ($i==$year)?'selected':'';
echo "
<option value='".$i."' ".$selected.">".$i."</option>
";
}
?>
</select>
</div>
For SQL
$sql = "SELECT referenceno, employeeidno, accounttitle, 'ON PROGRESS' as debit, postedby, approvedby, notedby, credit FROM earningsamendment where accounttitle= '$accounttitle' and YEAR(datedue)='$year'";
$query = sqlsrv_query($conn, $sql, array(), array("Scrollable" => SQLSRV_CURSOR_KEYSET));
while($row = sqlsrv_fetch_array($query, SQLSRV_FETCH_ASSOC)){
This is my concern.
$(function(){
$('#select_account_title').change(function(){
window.location.href = 'earnings_amendment.php?accounttitle='+$(this).val();
});
});
</script>
How will I enable <script> to read 2 parameters? like
$(function(){
$('#select_account_title').change(function(){
window.location.href = 'earnings_amendment.php?accounttitle='+$(accounttitle).val()'&year='+$(year).val();
});
});
</script>
or something similar?

Answer 1

You need an on change with multiple selectors.
$(document).on('change', '#select_account_title, #select_year', function() {
var account_title = $("#select_account_title").val();
var year = $("#select_year").val();
window.location.href = 'earnings_amendment.php?accounttitle='+account_title+'&year='+year;
});