get selected value in an auto populated drop down - php

Question

I would like to know how we can store the value selected in an auto populated drop down (HTML5) into a variable, all in PHP. I want to obtain this value BEFORE clicking the 'Submit' button.
<?php
$i=1;
$j=0;
$result=pg_exec($pgsql_conn,"select * from crm.product_info order by 1");
while ($row = pg_fetch_assoc($result))
{
?>
<td><input type="checkbox"
id= <?php
echo $row['product_id'];
?>
value= <?php
echo $i;
?>
name= "prod[]">
<?php echo $row['product_name']; ?>
</td>
<td>
<input type="button" value=<?php echo "$".$row['product_value']; ?> id="but">
</td>
<td>
Quantity
<select class="select" name="qty[]">
<?php echo "qty".$j; ?>
</select>
</td>
<td>
Amount
<input
id="amt"
type="text"
readonly
value=<?php
echo $row['product_value']
?> >
</td>
<?php
}
?>
I require the SELECTED value of 'quantity'.
This is how i auto populate the quantity. It is from 0-100.
$(document).ready(function() {
for(i=0;i<=100;i++)
{
$(".select").append("<option value=\""+i+"\">"+i+"</option>");
}
});

Answer 1

First of all, PHP is server side, so it can't handle changes made in the browser until a request is send to it. You will have to use javascript to know selected value in real time before submitting the form. You can manipulate this value using javascript. But if you really need to do some PHP with the selected value, your solution is to use Ajax for this.