How to change the value of an xml node with jquery?

This may be a simple question though can´t figure out how to do it. I want to load and modify an xml file, then save the xml through php.

Here is the code:

 $.ajax({
  type: "GET",
  url: "menu.xml",
  dataType: "xml"开发者_开发百科,
  success: function(xml) {
   $(xml).find('menu_item').each(function(){
    //change the value of menu_item
    $(this).empty();
    $(this).text($("textarea").attr("value"));
    //send xml to php
    $.post('save_xml.php', $(xml), function(data){alert("Data Loaded: " + data);});
   }

  }
 });

Here is how save_xml.php looks like:

<?php

    $xml = $GLOBALS["HTTP_RAW_POST_DATA"];
    $file = fopen("file.xml","w");
    fwrite($file, $xml);
    fclose($file);
    echo "ok";

?> 

Is this what you are looking for?

$(this) is each of the menu_items you iterate over with .each()

Your code becomes

$(xml).find('menu_item').each(function(){
   $(this).text("New Value");
});

Hope this helps

EDIT

To post this back to the server I would do this:

$.post('save_xml.php', { xml: $(xml)}, function(data){alert("Data Loaded: " + data);});

and then in the PHP file

<?php
  $xml = $_POST['xml'];
  $file = fopen("file.xml","w");
  fwrite($file, $xml);
  fclose($file);
  echo "ok";
?> 

This code is untested, and there could be any number of reasons it doesn't work, write permissions on the files etc.