How to got page onload js event from Lander by Voluum?

[rogers.social]

hi everyone:

many traffic, many click, but less conversatoin.

i guess, there are not real audient, just bot or not real care people.

so, i want to known real click, eg when the Lander page load complete.

just like a custom js event fire, i can see the data like Anti-fraud kit cool feature.

but in the Voluum lander, there are only lander.ID, not clickID, so the Custom conversions not effect.

http://aabbcc.com/postback?cid=REPLACE&payout=OPTIONAL&txid=OPTIONAL&et=OPTIONAL

my lander js code such as:

<script type="text/javascript">
function getToken(variable)
{
        var query  = window.location.search.substring(1);
        var vars = query.split("&");
         for (var i=0;i<vars.length;i++) {
                  var pair = vars[i].split("=");
                  if(pair[0] == variable){return pair[1];}
        }
        return(false);
};

var  goal = "https://aabbcc.com/postback?cid="+getToken("lander_id")+"&et=Viewed";
 
function redir(){
alert('redir');

alert(window.location);
};

function load_lpViewed()
{
alert('load_lpViewed');
setTimeout(redir,  1000);
}

</script>

    </head>