Textarea内容归档

I want to save the content of a textarea to a file. I have written my script as illustrated in that topic:
Save content of a div to new file with jQuery AJAX and PHP

I just save the content of a textarea instead of the div.. And that works!
The problem is that only the text that is displayed in the textarea at the beginning is saved to the file. I want the changed text of the textarea to be saved.

Would be very nice if anyone can help me editing this script to make it work.

Regards
Markus

maybe you´re looking for something like this:

it will always save the actual text when it changes (as i understood you)

$("#data2save").change(function() {

var bufferId =$("#data2save").text();

        $.ajax({
             method : "POST",
             url : "saver.php",
             data: {id : bufferId},
             dataType: "html",
             success: function(data){ 
             alert("ok");  
             }
             });
});

if it´s not what youre looking for u definetly need to make use of .text() to retrieve the textares content

var bufferId =$("#data2save").text();