# jsTree v.1.0 - html_data plugin

## Description

The `html_data` plugin enables jsTree to convert nested unordered lists to interactive trees. jsTree can also get HTML from the server insert it into the DOM and convert that to a tree.

The basic structure you need to follow when supplying data in the HTML format is:

    <li>
    	<a href="some_value_here">Node title</a>
    	<!-- UL node only needed for children - omit if there are no children -->
    	<ul>
    		<!-- Children LI nodes here -->
    	</ul>
    </li>

If you inspect the resulting structure you will find it a bit different - that is because jstree will automatically do some corrections.

    <!-- one of the three classes will be applied depending on node structure -->
    <li class="[ jstree-open | jstree-closed | jstree-leaf ]">
    	<!-- an INS element is inserted -->
    	<ins class="jstree-icon">&#160;</ins>
    	<a href="some_value_here">
    		<!-- another INS element is inserted -->
    		<ins class="jstree-icon">&#160;</ins>
    		Node title
    	</a>
    </li>

Both `ins` elements are inserted for visualization purposes. As for the class (`jstree-open`, `jstree-closed`) - you can specify that yourself to force the node to appear either closed or opened. Making a node with no children appear closed is often used - if you use ajax, opening a closed node with no children will result in jstree making a server call for the children (see the demo below).

## Configuration

### data

A HTML string (or `false` if not used). Default is `false`.

Specifies the content to load into the container and convert to a tree.

### ajax

An object (or `false` if not used). Default is `false`.

The ajax config object is pretty much the same as the jQuery ajax settings object.

You can set the `data` option to a function, that will be executed in the current tree's scope (`this` will be the tree instance) and gets the node about to be open as a paramater (or `-1` for initial load). Whatever you return in the function will be sent to the server as data (so for example you can send the node's ID).

You can set the `url` option to a function, that will be executed in the current tree's scope (`this` will be the tree instance) and gets the node about to be open as a paramater (or `-1` for initial load). Whatever you return in the `url` function will be used as the ajax URL (so that you can accomodate pretty paths such as /get_children/node_2).

The `error` and `success` functions (if present) also fire in the context of the tree, and if you return a value in the `success` function it will be used to populate the tree - this can be useful if you want to somehow change what the server returned on the client side before it is displayed in the tree.

### correct_state

A Boolean. Default is `true`.

If this option is set to `true` if an AJAX request returns an empty result, the node that was about to be opened will be converted to a leaf node (the open icon will no longer be displayed).

NOTE:
If both `data` and `ajax` are not set, the current container's HTML is used to build the tree.
If both `data` and `ajax` are set the initial tree is rendered from the `data` string. When opening a closed node (that has no loaded children) an AJAX request is made.

## Demos

### Using initial content (convert an existing list)

- Root node 1
  - Child node 1
  - Child node 2
- Root node 2

### Using the data config option

### Using the ajax config option

### Using both the data & ajax config options

## API

Both dummy functions - `_is_loaded` and `load_node` are overwritten.

### .load_node_html ( node , success_callback , error_callback )

This function is called instead of `load_node`.

- `mixed` node

  This can be a DOM node, jQuery node or selector pointing to an element you want loaded. Use `-1` for root nodes.

- `function` success_callback

  A function to be executed once the node is loaded successfully - used internally. You should wait for the `load_node` event.

- `function` error_callback

  A function to be executed if the node is not loaded due to an error - used internally. You should wait for the `load_node` event.