如何用Ajax重新加载php文件？

I have a php file that's create a .txt file with name of some photos. But constantly new photos are being added to the images folder. On my index page, I have a javascript function that call the ajax function, because I don't want to reload the page. I just want to request again the php file to recreate the .txt file with the name of all photos again. Can someone help me with the ajax?

I would use JQuery for this as it'll become much easier.

$.ajax({
  url: 'path/createtextfile.php',
  success: function(data) {
    alert('textfile created');
  }
});

As this stands right now it returns a result from createtextfile.php and does a alert.

However if your file returns the names of all the pictures in a list (delimitered of course)

Example: name1, name2, name3

you can then explode this list into an array and use JQuery again to create html elements to display the names.