javascript - set attribute value dynamically from from event -

i need set value of attribute show 'x' amount of stars need run event database average , use number?

here html 'data-rateit-value' attribute id modify dynamically.

<div id="randomtest" data-productid="randomtest" class="rateit" data-rateit-value=""></div> 

i tried modify without event query database , didnt set it? need advise before go on including event.

$('#randomtest').attr( 'data-rateit-value','4'); 

but once im able able set dynamically have made basic demo of below? if not further guidance appreciated.

$.ajax({     url: 'currentvalue.php',     data: { id: productid, value: value },     type: 'post',      success: setcurrentvalue });  function setcurrentvalue(data) {     $('#randomtest').attr( 'data-rateit-value'.append(data)); } 

thanks help

edit changed query , results , alerts integer still doesn't append attribute

$.ajax({     url: 'currentstars.php', //your server side script     data: { id: productid, value: value }, //our data     type: 'post',      success: function(results) {      alert(results);     $('.rateit').attr( 'data-rateit-value'.append(results))     } }); 

i don't know if helps trying work out why it's not working?

first should check getting expect server:

function setcurrentvalue(data) {     console.log(data);     ... } 

what structure of data?

i'm not sure want happen setcurrentvalue function, have syntax errors in line $('#randomtest').attr( 'data-rateit-value'.append(data));. attr can called attr(attribute, value) maybe $('#randomtest').attr( 'data-rateit-value', data); closer need