Question

<script type="text/javascript">
function showState(str){
    if (str.length==0){ 
        document.getElementById("txtHint").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("state").innerHTML=xmlhttp.responseText;
        }
    }

    xmlhttp.open("GET","getState.php?cid="+str,true);
    xmlhttp.send();
}
</script>

This code doesn’t works in IE but fine in mozilla and chrome

Answer 1

You have to call send(null) on the xmlhttp-Object.
Just add

xmlhttp.send(null);

This will actually send the request.