Simple Javascript to write to mysql

This is more of a braindump/code dump for me. Original source…

Note: If you are going to use PHP values in this script please make sure they are set first…

Note2: I know javascript isn’t writing directly to mysql, this is my preferred method. function.php does the actual writing to mysql.. (uses update function – if you are reading this I expect you already know how to write a simply mysql update/insert statement and execute it inside of php..

Example.html

<!-- Function to save avatarID -->
<script type="text/javascript">
function showUser(str)
{
if (str=="")
  {
  document.getElementById("avatarsavediv").innerHTML="";
  return;
  }
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
    document.getElementById("avatarsavediv").innerHTML=xmlhttp.responseText;
    }
  }
// best to set a new variable name so I don't forget what I'm working on
var avatarid = str;
// below we can grab a mysql value if we need to
var phpnickname = "<?= $username ?>";
var avurl = "function.php?nickname="+phpnickname+"&avatarid="+avatarid;
xmlhttp.open("GET",avurl,true);
xmlhttp.send();
}
</script>

<div id="avatarsavediv"></div>

Final note: The above shows the output