Tree View

Bryon Baker

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16 Mar 20051 min read

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Tree View builds tree browsers for your web pages.

Sample Image - screenshot.gif

Introduction

Tree View builds tree browsers for your web pages. It was inspired by D. D. de Kerf who created Easy DHTML treeview.

However, it was not practical for creating complex dynamic trees. So I took his ideas and wrote a JavaScript that uses DOM to build the hierarchical document he created with static HTML.

To build the tree is very straightforward:

You include the treeview.js file into your HTML.

HTML

<script language="javascript" src="scripts/tree_view.js"></script>

Hook into the event that calls a method when the page is loaded:
HTML
```
<body onLoad="CreateProjectExplorer()">
```

Create a function that builds the tree:

JavaScript

function CreateProjectExplorer()
{
    Initialise();
    // This MUST be the called before
    // any other of treeview's funcitons.

    // Build a test project.
    d = CreateTreeItem( rootCell, "img/project.gif", 
        "img/project.gif", "Point of Sale terminal", 
        null, null );
    d2 = CreateTreeItem( d, "img/folder_closed.gif", 
         "img/folder_open.gif", "Actors", null, null );
    // .....
}

That's it! You are up and running with a tree browser.

The function signature is:

JavaScript

// Creates a new package under a parent. 
// Parameters:
//    parent: The parent element of the new element. (E.g. a folder)
//    img1FileName: File name of the "unclicked" image. (E.g. Closed folder)
//    img2FileName: File name of the "clicked" image. (E.g. Open folder)
//    nodeName: The text to display for the tree node.
//    url: The url to link to when the node is clicked.
//    target: Target when the node is clicked.
//            Possible values are: Frame name, _blank, _self
// Returns:
//    The newly created tree node item. 
//    To create children of the new node pass the returned 
//    node in as a parent of another new node.
function CreateTreeItem( parent, img1FileName, 
                         img2FileName, nodeName, url, target )

Thanks to D. D. de Kerf for the inspiration!

Note: This script is supplied "as is" without any form of warranty. Rewritten Software shall not be liable for any loss or damage to person or property as a result of using this script. Use this script at your own risk!

You are licensed to use this script free of charge for commercial or non-commercial use providing you do not remove the copyright notice or disclaimer from the comment section in the script.

Have fun!

License

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