AJAX Inviare query

[lucavizzi]

ajax.js

function sendRequest(){
    var postToSend=document.getElementById('[COLOR=blue]txt[/COLOR]').value;//i dati da inviare
    
    var xmlhttp=new XMLHttpRequest(); // IE7+ ...
    xmlhttp.open("POST","sendmessage.php",true);
    xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");//per inviare il form
    xmlhttp.send("[COLOR=red]textareaContent[/COLOR]="+postToSend);
    
    xmlhttp.onreadystatechange=function()   {
       if (xmlhttp.readyState==4 && xmlhttp.status==200){
         alert(xmlhttp.responseText);
       }
    }
} 

index.php

<script src="ajax.js" type="text/javascript"></script>
<form method="post">
<textarea cols="20" rows="2" id="[COLOR=blue]txt[/COLOR]"></textarea>
<input type="button" onClick="sendRequest();"/>
</form> 

in sendmessage.php, per recuperare il testo nella textarea:

$text=$_POST['[COLOR=red]textareaContent[/COLOR]']