Many people asked me how to implement the basic CRUD functionalities for the D&D Tree, so here it is:
Download persistentTreeCRUD.zip
I use the simpletree callback function afterDblClick for the modify functionality, and a simple jQuery click for add and delete. I also used nyroModal for the popup windows.
In this example i reload the page when a CRUD operation is performed, a better implementation should use ajax to modify the tree on the fly.
Is not perfect but it works 
Enjoy!
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In this second part of this article (this is the first part) i’m going to show you how to retreive and serialize the tree structure using jQuery and sent the serialized data to a php script (using ajax) that saves it on the database. In this way, we can have the persistence of any change made on the tree.
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I’m developing a website that have a catalog with nested categories; this categories are also ordered and with a not predefined depth levels. I needed to find a way to manage with category in a fast and intuitive way for the user, so i decided to use a directory like tree allowing the users to drag and drop the categories to change the order and even the position on the tree: of course i use jQuery to do this, and PHP/MySQL to save the structure of the tree in a database.
I found a nice tree jQuery plugin on the web, that i used as a starting point for my project: http://news.kg/wp-content/uploads/tree/. The plugin work well on all browser i tested (FF3, Safari 3, IE6, IE7). It provide the drag and drop funcionality and some interesting callback, like afterClick and afterDblClick.
But let’s start from the beginning.
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I had to find a regex to match not a string that contain something, but a string that not contain something, and in particular i had to check that a link entered in a form does not begin with http://. I needed to use a regex for this that work with PHP and, i have to admin, it was not so simple.
The method that i found is based on lookahead technique, but seem to work only with preg_match() and not with ereg(). Is not perfect, because it don’t match any string that contain http://, not only that begin with.
This is the regex:
(^((?!.*http\://).)*$)
This match www.ciao.com, but not http://www.ciao.com and also not www.ciao.com/http:// and any string that contain http://. It work for my needs, but is not what really wanted to achieve.
If you know a method to correct the regex, please tell me.
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