Extension:Livelets.php

<?

1. Extension:Livelets{{#Security:*|dev}}{{#Security:view|*}}Template:Php
2. - Allows live articles to be transcluded which update automatically on change in a non-polling, fully event-driven way
3. - See http://www.mediawiki.org/wiki/Extension:Livelets for installation and usage details
4. - Licenced under LGPL (http://www.gnu.org/copyleft/lesser.html)
5. - Author: http://www.organicdesign.co.nz/nad

define('LIVELETS_VERSION', '0.1.0, 2007-05-11');

$wgLiveletsMagic = "live"; # the parser-function name for doing live-transclusions $wgExtensionFunctions[] = 'wfSetupLivelets'; $wgHooks['LanguageGetMagic'][] = 'wfLiveletsLanguageGetMagic';

$wgExtensionCredits['parserhook'][] = array( 'name' => 'Livelets', 'author' => 'User:Nad', 'description' => 'dynamic non-polling updates of articles', 'url' => 'http://www.mediawiki.org/wiki/Extension:Livelets', 'version' => LIVELETS_VERSION );

class Livelets {

var $version = LIVELETS_VERSION; var $id = 0;

# Constructor function Livelets($magic) { global $wgParser,$wgHooks,$wgOut,$wgScript,$wgLiveletsPath; $live = array_key_exists('live',$_REQUEST); $wgParser->setFunctionHook($magic,array($this,'functionHook')); }

# Remove live container content function functionHook(&$parser,$title) { global $wgScript,$wgLiveletsPath; $this->addJSandSWF(); $id = 'livelet'.$this->id++; # this should be a GUID $url = Title::newFromText($title)->getFullURL('action=render');

$html = "

<img src='$wgLiveletsPath/wait.gif'/>

";

$html .= "<script type='text/javascript'>liveletRequest('$id')</script>"; return array($html,isHTML => true); }

function addJSandSWF() { global $wgOut,$wgLiveletsPath,$wgAddJavaScriptFunctions;

# Add the livelets JavaScript functions to the output page $wgAddJavaScriptFunctions['Livelets'] = "

// Keep record of livelets on page var livelets = new Array();

// Request an URL function liveletRequest(id) { livelet = document.getElementById(id) livelets.push(livelet); livelet.id = id livelet.url = livelet.getAttribute(url); livelet.xmlhttp = null if (window.XMLHttpRequest) livelet.xmlhttp = new XMLHttpRequest() else if (window.ActiveXObject) livelet.xmlhttp = new ActiveXObject('Microsoft.XMLHTTP') if (livelet.xmlhttp != null) { livelet.xmlhttp.onreadystatechange = stateChange livelet.xmlhttp.open('GET',livelet.url,true) livelet.xmlhttp.send(null) } else alert('Your browser does not support XMLHTTP!') }

// Update the livelet content when loaded function stateChange() { for (var i = 0; i < livelets.length; i++) { var livelet = livelets[i]; var xmlhttp = livelet.xmlhttp if (xmlhttp.readyState == 4) { if (xmlhttp.status == 200) livelet.innerHTML = xmlhttp.responseText else alert('Problem retrieving XML data!') xmlhttp.readyState = 0; } } }

// Trap fscommands from the SWF movie function livelets_DoFScommand(cmd,args) { alert(args) }";

# Embed livelets.swf into the output page # NOTE: this actually needs to be served by the WikiDaemon, not the PHP $swf = "$wgLiveletsPath/livelets.swf"; $wgOut->addHTML("<object classid='clsid:D27CDB6E-AE6D-11cf-96B8-444553540000' codebase='http://active.macromedia.com/flash2/cabs/swflash.cab#version=4,0,0,0' id='livelets' width=100 height=100> <param name='movie' value='$swf'> <embed swliveconnect='true' name='livelets' src='$swf' width=100 height=100 type='application/x-shockwave-flash' pluginspage='http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash'> </embed></object>"); }

}

1. Called from $wgExtensionFunctions array when initialising extensions

function wfSetupLivelets() { global $wgLivelets,$wgLiveletsMagic,$wgScriptPath,$wgLiveletsPath; $wgLivelets = new Livelets($wgLiveletsMagic); if ($wgLiveletsPath == ) $wgLiveletsPath = "$wgScriptPath/extensions/livelets"; }

1. Needed in MediaWiki >1.8.0 for magic word hooks to work properly

function wfLiveletsLanguageGetMagic(&$magicWords,$langCode = 0) { global $wgLiveletsMagic; $magicWords[$wgLiveletsMagic] = array(0,$wgLiveletsMagic); return true; }

Template:AddJavaScript ?>