Extension talk:Treeview5.php

This talk page pertains specifically to the development of this extension. For more general discussion about bugs and usage etc, please refer to the mediawiki.org talk page at MW:Extension talk:Tree view

A more logical way of approaching a treeview in MediaWiki is for the PHP extension part to concentrate on allowing bullet lists (and maybe numbered lists too) to work recusively with transclusion, and for the tree rendering to be handled by existing JavaScript components such as dTree which are very good and packed with features such as persistence between pages.

Note: Extension:DTree.php has been created in the mean time to test dtree, the code will be integrated into Extension:Treeview5.php.

Treeview4 already handles the recursion aspect well and has been written in a much more modular way than Treeview3 allowing it to be independent of the tree rendering. But in this version I'd like to make the list-recursion work without any parser-function syntax at all - i.e. essentially to fix the MediaWiki parser's limitation of not allowing transclusion to work properly with lists as in the following example.

*Foo
**Bar
**{{:Baz}}
**Fodda

The new version would allow the Baz article (if it were a bullet list) to be properly nested at the correct level in the parent tree. This would simply be based on the fact that the transclusion is directly after an asterisk. The following example would not be indented, the indentation of Baz is determined by the article itself.

*Foo
**Bar
{{:Baz}}
**Fodda

The #tree parser-function would still be used to make bullet lists into trees, but would be optional and would provide an interface to convert the transcluded bullet lists into the javascript required in dTree (see Extension talk:Treeview5.php#Dtree API) to generate a tree.

Persistance

Persistance is auctomatically handled via cookies, see dtree.js, line 36.

Dtree API

See file api.html in the dTree directory.

Basically this extension need to provide an interface from a parser function which deals with nested bullet lists to creating the javascript output. At the bullet list stage the php function htmlspecialchars on the input to prevent cross site scripting. See HTML Code Injection and Cross-site scripting for details.

Open/Close parser function

Dedicated parser functions should be provided which inserts the open/close functionality of clades on the tree.

<p><a href="javascript: d.openAll();">open all</a> | <a href="javascript: d.closeAll();">close all</a></p>

Note here that the javascript object is a tree called d. The functionality will not work for any other tree other than that named d.

Tree example

This example generates a tree similar to the example01.html provided with dTree

Wikisyntax

{{#tree:openlevels=4|root='My example tree'|
*Node 1
**Node 1.1
***Node 1.1.1
****Node 1.1.1.1
*Node 2
*Node 3
*Node 4
*My Pictures
**The trip to Iceland
**Mom's birthday
*Recycle bin
}}

Original javascript syntax;

	d = new dTree('d');

	d.add(0,-1,'My example tree');
	d.add(1,0,'Node 1','/wiki/index.php?title=Sandbox');
	d.add(2,0,'Node 2','example01.html');
	d.add(3,1,'Node 1.1','example01.html');
	d.add(4,0,'Node 3','example01.html');
	d.add(5,3,'Node 1.1.1','example01.html');
	d.add(6,5,'Node 1.1.1.1','example01.html');
	d.add(7,0,'Node 4','example01.html');
	d.add(8,1,'Node 1.2','example01.html');
	d.add(9,0,'My Pictures','example01.html','Pictures I\'ve taken over the years','','','img/imgfolder.gif');
	d.add(10,9,'The trip to Iceland','example01.html','Pictures of Gullfoss and Geysir');
	d.add(11,9,'Mom\'s birthday','example01.html');
	d.add(12,0,'Recycle Bin','example01.html','','','img/trash.gif');

	document.write(d);

Equivalent reordered javascript syntax;

	e = new dTree('e');

	e.add(0,-1,'My example tree');
	e.add(1,0,'Node 1','/wiki/index.php?title=Sandbox');
	e.add(2,1,'Node 1.1','example01.html');
	e.add(3,2,'Node 1.1.1','example01.html');
	e.add(4,3,'Node 1.1.1.1','example01.html');
	e.add(5,1,'Node 1.2','example01.html');
	e.add(6,0,'Node 2','example01.html');
	e.add(7,0,'Node 3','example01.html');
	e.add(8,0,'Node 4','example01.html');
	e.add(9,0,'My Pictures','example01.html','Pictures I\'ve taken over the years','','','img/imgfolder.gif');
	e.add(10,9,'The trip to Iceland','example01.html','Pictures of Gullfoss and Geysir');
	e.add(11,9,'Mom\'s birthday','example01.html');
	e.add(12,0,'Recycle Bin','example01.html','','','img/trash.gif');
	
	document.write(e);

Defining the root of the tree

The root of the tree could be optionally specified with a parameter called root in the parser function options. It must be specified as either;

unnamed

	e.add(0,-1,'');

or named

	e.add(0,-1,'My example tree');

for the tree to be rendered.

{{{1}}}

See also

• dTree (javascript based)
• Slipstream wp-Dtree (php based)