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Passing Js Variable To Php Variable

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I want to pass the id value of the tag that has just been clicked to a php file that is being loaded onto the page using greybox. I got the id stored in a js variable called link

Solution 1: 

var myCallback = function(caller){
    var linkID = caller.id; 

    var xmlhttp = newXMLHttpRequest();
    xmlhttp.open("POST","species/butterfly.php",true);
    xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
    xmlhttp.send("linkID="+linkID;);

    xmlhttp.onreadystatechange = function(){
        if(xmlhttp.readyState == 4 && xmlhttp.status == 200){
            alert("Request complete. Data: "+xmlhttp.responseText);
        }
    };

    alert(linkID);
 }

EDIT:

Pure GreyBox:

var myCallback = function(caller){
    var linkID = caller.id; 
    caller.href = "species/butterfly.php?linkID="+linkID;
}

Solution 2:

This will convert js variable to php variable

<script>functionsud(){

javavar=document.getElementById("text").value;  

document.getElementById("rslt").innerHTML="<?php$phpvar='"+javavar+"'; 
echo$phpvar.$phpvar;?>";
}

function sud2(){
document.getElementById("rslt2").innerHTML="<?phpecho$phpvar;?>";
}

</script><body><divid="rslt"></div><divid="rslt2"></div><inputtype="text"id="text" /><buttononClick="sud()" >Convert</button><buttononClick="sud2()">Once Again</button></body>

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