How to pass variable in javascript for query in php using ajax -


i want use value input file hidden when doing click on href.

<a href="#" onclick="invoice_open(<?php echo $counter?>);">confirm</a>  function invoice_open(i){     var x = document.getelementbyid("inv"+i).value;     alert(x);      window.scrollto(0,0);     document.getelementbyid('light').style.display='block';     document.getelementbyid('fade').style.display='block';   }

i success value input type hidden (var x), don't know how pass x value php ex. $result = x.

i want use $result display data database. please help. thank you

since values using <?php echo $counter?> can 

var counter = '<?php echo $counter?>'

in javascript. , typical ajax approach following..

$.ajax({         url: 'index.php&counter=' + counter,         datatype: 'json',         beforesend: function() {          },         complete: function() {          },                   success: function(json) {             // dom, redirect ... etc         },         error: function(xhr, ajaxoptions, thrownerror) {             // handles exception         }     });

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