Write to file using ajax?

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i have a textarea and a save button..I want to capture the data in the textarea and write it to a file but am getting problems..Am getting problems in writing the code for ajax.Note i am not using form.

<textarea  id="display" name="display" style="overflow:auto;resize:none"     rows="35" cols="40"><?php echo $data;?></textarea>



   <input type="button" name="Save" value="Save" onclick="save_data()"/>

This is the Ajax i wrote...
function save_data(){

        var ajaxadd;
        ajaxadd=new XMLHttpRequest();
        var url = "save.php";
        ajaxadd.open("GET",url,true);
        ajaxadd.onreadystatechange = function(){
            if(ajaxadd.readyState==4){
                document.getElementById('display').value = ajaxadd.responseText;
            }
        }
        ajaxadd.send(null);
        alert("Item successfully ADDED!");
    }


This is the save.php
<?php
if(!empty($_POST['data'])){
    $data = $_POST['data'];
    $fname ="XHTML_file.xhtml";

    $file = fopen($fname, 'w');//creates new file
    fwrite($file, $data);
    fclose($file);
}

?>

asked 54 secs ago

John

1