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<?php
// thewall.php, thewall.common.php, thewall.server.php
// demonstrate a demonstrates a xajax implementation of a graffiti wall
// using xajax version 0.2
// http://xajaxproject.org
if (!defined ('MAX_SCRIBBLES'))
{
define ('MAX_SCRIBBLES', 5);
}
if (!defined ('DATA_FILE'))
{
define ('DATA_FILE', "thewall.dta");
}
class graffiti
{
var $html;
var $isValid = false;
function graffiti($sHandle, $sWords)
{
if (trim($sHandle) == "" || trim($sWords) == "")
{
return;
}
$this->html = "\n<div style=\"font-weight: bold;text-align:".$this->getRandomAlignment();
$this->html .= ";color:".$this->getRandomColor().";\">";
$this->html .= "<span style=\"font-size:".$this->getRandomFontSize()."%;\">";
$this->html .= strip_tags(stripslashes($sWords));
$this->html .= "</span><br/><span style=\"font-size: small;\">";
$this->html .= " ~ ".strip_tags(stripslashes($sHandle))." ".date("m/d/Y H:i:s")."</span></div>";
$this->isValid = true;
}
function getRandomFontSize()
{
srand((double)microtime()*1000003);
return rand(100,300);
}
function getRandomColor()
{
$sColor = "rgb(";
srand((double)microtime()*1000003);
$sColor .= rand(0,255).",";
srand((double)microtime()*1000003);
$sColor .= rand(0,255).",";
$sColor .= rand(0,255).")";
return $sColor;
}
function getRandomAlignment()
{
$sAlign = "";
srand((double)microtime()*1000003);
$textAlign = rand(0,2);
switch($textAlign)
{
case 0: $sAlign = "left"; break;
case 1: $sAlign = "right"; break;
case 2: $sAlign = "center"; break;
}
return $sAlign;
}
function save()
{
if ($this->isValid)
{
$rFile = @fopen(DATA_FILE,"a+");
if (!$rFile) {
return "ERROR: the graffiti data file could not be written to the " . dirname(realpath(DATA_FILE)) . " folder.";
}
fwrite($rFile, $this->html);
fclose($rFile);
return null;
}
else
{
return "Please supply both a handle and some graffiti to scribble on the wall.";
}
}
}
function scribble($aFormValues)
{
$sHandle = $aFormValues['handle'];
$sWords = $aFormValues['words'];
$objResponse = new xajaxResponse();
$objGraffiti = new graffiti($sHandle,$sWords);
$sErrMsg = $objGraffiti->save();
if (!$sErrMsg)
{
$objResponse->addScript("xajax_updateWall();");
$objResponse->addClear("words","value");
}
else
$objResponse->addAlert($sErrMsg);
return $objResponse;
}
function updateWall()
{
$objResponse = new xajaxResponse();
if (file_exists(DATA_FILE)) {
$aFile = @file(DATA_FILE);
if (!$aFile) {
$objResponse->addAlert("ERROR: the graffiti data file could not be written to the " . dirname(realpath(DATA_FILE)) . " folder.");
return $objResponse;
}
$sHtmlSave = implode("\n",array_slice($aFile, -MAX_SCRIBBLES));
$sHtmlSave=str_replace("\n\n","\n",$sHtmlSave);
}
else {
$sHtmlSave = "";
$aFile = array();
}
$rFile = @fopen(DATA_FILE,"w+");
if (!$rFile) {
$objResponse->addAlert("ERROR: the graffiti data file could not be written to the " . dirname(realpath(DATA_FILE)) . " folder.");
return $objResponse;
}
fwrite($rFile, $sHtmlSave);
fclose($rFile);
$sHtml = implode("\n",array_reverse(array_slice($aFile, -MAX_SCRIBBLES)));
$objResponse->addAssign("theWall","innerHTML",$sHtml);
return $objResponse;
}
require("thewall.common.php");
$xajax->processRequests();
?>
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