javascript - Trigger a PHP function on drop down change -

i trying create web site table of results have drop down box @ end of each row let select quantity of row. in case user have thousands of results based on search criteria possibly large , variable amount of results on page @ 1 time.

i want use onchange or similar method update each change in background (update query table) without reloading page. no other information on page change , unnecessary delay user reload page, pulls tables mean.

i have been searching net several days now, , figured out how information extracted on drop down changed , changed in javascript.

i haven't found how trigger update sql command without reloading page. can please tell me how variables extracted sql update without reloading page?

here have far. appreciated.

function quantityfunction(select) {     var selectedoption = select.options[select.selectedindex];           alert (\"the selected option \" + selectedoption.value);  }//alert testing  </script>  <?php echo"<select onchange=\"quantityfunction(this)\">"; while($temp<101) { echo"<option value='$item-$temp'>$temp"; $temp++; } </select> ?>