With the Nitobi Tree component you can choose to bind to a dataset on the server side, similar to how Grid and ComboBox can bind to server-side data.
From The Declaration
On the client side, all you need to do to enable databound mode for the Tree is to specify a URL for the gethandler attribute. For example, if you had a gethandler called simplegethandler.php, your Tree declaration would be as follows:
<ntb:tree id="tree1" cssclass="folder" gethandler="simplegethandler.php"></ntb:tree>
When the Tree first loads and when you expand a node, it will make a request to the gethandler which will return the appropriate data.
The Request Parameters
On the server-side, we need to define a script to get records from the database, construct an XML document from those records, and return the result back to the client.
When the Tree makes a request to the server, it makes a request like the following:
simplegethandler.php?id=13&label=Australia&nodetype=node&haschildren="true"&treeId="tree1"
The parameters that are passed are:
- id - Tells us the id of the node requesting its children (this will be blank if the tree is requesting its children)
- label - The label on the node making the request
- nodetype - Will either be node or leaf
- haschildren - true if the node has children, false otherwise
- treeId - The id attribute of the Tree declaration
Writing the GetHandler
We have separate tutorials available for each platform you can use:
