Examples: Request - XML

Front End
Back End

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Chapter 4 : Data Types - XML Request </title>

<script type="text/javascript">

 
function encodeValue(val)
{
 var encodedVal;
 if (!encodeURIComponent)
 {
   encodedVal = escape(val);
   /* fix the omissions */
   encodedVal = encodedVal.replace(/@/g, '%40');
   encodedVal = encodedVal.replace(/\//g, '%2F');
   encodedVal = encodedVal.replace(/\+/g, '%2B');
 }
 else
 {
   encodedVal = encodeURIComponent(val);
   /* fix the omissions */
   encodedVal = encodedVal.replace(/~/g, '%7E');
   encodedVal = encodedVal.replace(/!/g, '%21');
   encodedVal = encodedVal.replace(/\(/g, '%28');
   encodedVal = encodedVal.replace(/\)/g, '%29');
   encodedVal = encodedVal.replace(/'/g, '%27');
 }
 /* clean up the spaces and return */
 return encodedVal.replace(/\%20/g,'+'); 
}
 
function createXHR()
{
   try { return new XMLHttpRequest(); } catch(e) {}
   try { return new ActiveXObject("Msxml2.XMLHTTP.6.0"); } catch (e) {}
   try { return new ActiveXObject("Msxml2.XMLHTTP.3.0"); } catch (e) {}
   try { return new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) {}
   try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {}
 
   return null;
}
 
function sendRequest(url, payload)
{
    var xhr = createXHR();
 
    if (xhr)
     {
       xhr.open("POST",url,true);
       xhr.setRequestHeader("Content-Type", "text/xml");
       xhr.onreadystatechange = function(){handleResponse(xhr);};
       xhr.send(payload);
     }
}
 
function handleResponse(xhr)
{
  if (xhr.readyState == 4  && xhr.status == 200)
    {
      var responseOutput = document.getElementById("responseOutput");
     responseOutput.innerHTML = xhr.responseText;
    }
}
 
 
function rate(rating, comment)
{
    /* determine rating value */
    var ratingVal = 0;
    for (var i=0; i < rating.length; i++)
    {
     if (rating[i].checked)
       {
        ratingVal = rating[i].value;
        break;
       }
    }
    
    ratingVal = encodeValue(ratingVal);
    comment = encodeValue(comment);
     
    var url = "https://ajaxref.com/ch4/setrating.php";
    var payload = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\r\n";
    payload += "<vote>\r\n";
    payload += "<rating>" + ratingVal + "</rating>\r\n";
    payload += "<comment>" + comment + "</comment>\r\n";
    payload += "</vote>\r\n";
    
    sendRequest(url, payload);
    
    return false;
}
 
 
window.onload = function () 
{ 
 document.ratingForm.onsubmit = function () { return rate(this.rating,this.comment.value); };
};

</script>

 
</head>
<body>
<h3>How do you feel about Ajax?</h3>
<form action="#" name="ratingForm" method="post" >
<em>Hate It - </em> [
<input type="radio" name="rating" value="1"  /> 1
<input type="radio" name="rating" value="2"  /> 2
<input type="radio" name="rating" value="3"  /> 3
<input type="radio" name="rating" value="4"  /> 4
<input type="radio" name="rating" value="5"  /> 5
] <em> - Love It</em><br /><br />
<label>Comments:<br />
<textarea id="comment" name="comment" rows="5" cols="40"></textarea></label><br />
<input type="submit" value="vote" />
</form>
<br />
<div id="responseOutput">&nbsp;</div>
</body>
</html>

view plain print

<?php
if (isset($_REQUEST["delay"]) && is_numeric($_REQUEST["delay"]))
    sleep($_REQUEST["delay"]);
 
/* File to write to */
$theFile = "ratings.txt";
$totalsFile = "totals.txt";
 
/* check request Content-Type headers */
$headers = getallheaders();
 
if (isset($headers["Content-Type"]) && !strstr($headers["Content-Type"], "application/x-www-form-urlencoded"))
{
    $payloadString =  $GLOBALS['HTTP_RAW_POST_DATA'];
    $payloadArray = array();
    
    if (strstr($headers["Content-Type"], "application/json"))
    {
        require_once('JSON.php');
        $json = new Services_JSON();
        $jsonObject = $json->decode($payloadString);
        $payloadArray = (array)$jsonObject;    
    }
    else if (strstr($headers["Content-Type"], "text/x-yaml"))
    {
        require_once('spyc.php');
        $payloadArray = Spyc::YAMLLoad($payloadString);
    }
    else if (strstr($headers["Content-Type"], "text/plain"))
    {
        if (isset($headers["Content-Transfer-Encoding"]) && $headers["Content-Transfer-Encoding"]  == "base64")
        {
            $payloadString = base64_decode($payloadString);
            parse_str($payloadString, $payloadArray);
        }
        else
        {    
            $tmpPayloadArray = explode(",", $payloadString);
            for($i=0;$i<count($tmpPayloadArray);$i++)
            {
                $index = strpos($tmpPayloadArray[$i], "=");
                $name = substr($tmpPayloadArray[$i], 0, $index);
                $value = substr($tmpPayloadArray[$i], $index+1);
                $payloadArray[$name] = $value;
            }
        }
    }
    else if (strstr($headers["Content-Type"], "text/xml"))
    {
        $doc = new DOMDocument();
        $doc->loadXML($payloadString);
        
        $children = $doc->documentElement->childNodes;
        for($i=0;$i<$children->length;$i++)
        {
             $child = $children->item($i);
             $payloadArray[$child->nodeName] = $child->nodeValue;
         }
    }
    $rating = cleanVariable(arrayIndex($payloadArray,"rating"));
    $comment = cleanVariable(arrayIndex($payloadArray,"comment"));
    $response = strtolower(cleanVariable(arrayIndex($payloadArray,"response")));
    $error = cleanVariable(arrayIndex($payloadArray,"error"));
    $callback = cleanVariable(arrayIndex($payloadArray,"callback"));
    $validdtd = cleanVariable(arrayIndex($payloadArray,"validdtd"));
}        
else
{
        
    /* pull the user ratings via the query string */
    $rating = cleanVariable(gpc("rating"));
    $comment = cleanVariable(gpc("comment"));
    $response = strtolower(cleanVariable(gpc("response")));
    $error = cleanVariable(gpc("error"));
    $callback = cleanVariable(gpc("callback"));
    $validdtd = cleanVariable(gpc("validdtd"));
}
 
if ($rating == "")
    $rating = 0;
 
$transport = "XHR";
 
if ($response == "")
    $response = "html";
 
/* if error is set, set appropriate header and then return */
if ($error != "")
{
    if ($error == "404")
    header("HTTP/1.1 404 Not Found\n\n");
    else
    header("HTTP/1.1 500 Internal Server Error\n\n");
 
    exit;
}
 
 
/* record the IP address and time */
$userIP =  $_SERVER['REMOTE_ADDR'];;
$currentTime = date("M d y h:i:s A");
 
/* open the file and get the contents */
$filehandle = fopen($theFile, "r");
if ($filehandle)
{
    $data = fread($filehandle, filesize($theFile));
    fclose($filehandle);
}
else
   die('Failed to read file');
 
 
/* open the file and write line to the top of the file */    
$filehandle = fopen($theFile, "w+");
if ($filehandle) 
{
    fwrite($filehandle,"$rating\t $transport\t $userIP @ $currentTime\t $comment\n");
    fwrite($filehandle, $data);
    fclose($filehandle);
}
else
    die('Failed to write file');
 
//get the totals
$votes = $total = $average = 0;
$filehandle = fopen($totalsFile, "r+");
if ($filehandle) 
{
    $line = fgets($filehandle, 4096);
    $tokens = explode("\t", $line);
 
    if (count($tokens) > 1)
    {
        $votes = $tokens[0] + 1;
        $total = $tokens[1] + $rating;
    }
 
    fclose($filehandle);
}
else
    die('Failed to read file');
 
$filehandle = fopen($totalsFile, "w+");
if ($filehandle) 
{
    fwrite($filehandle,"$votes\t$total\n");
    fclose($filehandle);
}
else
    die('Failed to write file');
 
if ($votes != 0) $average = round(($total/$votes), 2);
 
// send the right headers
header("Cache-Control: no-cache");
header("Pragma: no-cache");
header("Ajax-Response-Type: $response");
$message = "";
 
if ($response == "html")
{
    header("Content-Type: text/html");
    $message = "Thank you for voting.  You rated this a <strong>$rating</strong>.  There are <strong>$votes</strong> total votes.  The average is <strong>$average</strong>.  You can see the ratings in the <a href='https://ajaxref.com/ch4/ratings.txt' target='_blank'>ratings file</a>";
}
else if ($response == "text")
{
    header("Content-Type: text/plain");
    $message = "Thank you for voting.  You rated this a $rating.  There are $votes total votes.  The average is $average.";
} 
else if ($response == "csv")
{
    header("Content-Type: text/plain");
    $message = "$rating,$average,$votes";
}    
else if ($response == "base64 encoded")
{
    header("Content-Type: text/plain");
    header("Content-Transfer-Encoding: base64");
    $msg = "Thank you for voting.  You rated this a <strong>$rating</strong>.  There are <strong>$votes</strong> total votes.  The average is <strong>$average</strong>.  You can see the ratings in the <a href='https://ajaxref.com/ch4/ratings.txt' target='_blank'>ratings file</a>";
    $message = base64_encode($msg);
}
else if ($response == "xml")
{
    header("Content-Type: text/xml");
 
    $message = "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>
    <!DOCTYPE pollresults [
    <!ELEMENT pollresults (rating,average,votes)>
    <!ELEMENT rating (#PCDATA)>
    <!ELEMENT average (#PCDATA)>
    <!ELEMENT votes (#PCDATA)>
    <!ATTLIST rating id ID #IMPLIED>
    <!ATTLIST average id ID #IMPLIED>
    <!ATTLIST votes id ID #IMPLIED>
    ]>
        <pollresults>
            <rating id=\"rating\">$rating</rating>
            <average id=\"average\">$average</average>
            <votes id=\"votes\"";
        
    if ($validdtd == "false")
        $message .= " name=\"votes\"";
    
    $message .= ">$votes</votes>
        </pollresults>
    " ;
 
}
else if ($response == "xmldom")
{
    header("Content-Type: text/xml");
    $xml = new DOMDocument('1.0', 'UTF-8');
    $root = $xml->createElement("pollresults");
    
    $ratingNode = $xml->createElement("rating");
    $ratingNode->appendChild($xml->createTextNode($rating));
    $ratingNode->setAttribute("id", "rating");
    $root->appendChild($ratingNode);
    
    $averageNode = $xml->createElement("average");
    $averageNode->appendChild($xml->createTextNode($average));
    $averageNode->setAttribute("id", "average");
    $root->appendChild($averageNode);
    
    $votesNode = $xml->createElement("votes");
    $votesNode->appendChild($xml->createTextNode($votes));
    $votesNode->setAttribute("id", "votes");
    $root->appendChild($votesNode);
    
    $xml->appendChild($root);
 
    $message = $xml->saveXML();
}
else if ($response == "xmlbad")
{
    header("Content-Type: text/xml");
 
    $message = 
    "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\r\n
        <pollresults>\r\n
 
        <rating>$rating</rating>\r\n
        <average>$average\r\n
        <votes>$votes</votes>\r\n
 
        </pollresults>\r\n
    " ;
 
}
else if ($response == "xhtml hack")
{
    header("Content-Type: application/xhtml+xml");
 
    $message = 
    "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>
    <!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.1//EN\" \"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd\">
    <div xmlns=\"http://www.w3.org/1999/xhtml\">
        <rating id=\"rating\">$rating</rating>
        <average id=\"average\">$average</average>
        <votes id=\"votes\">$votes</votes>
    </div>" ;
 
}
else if ($response == "xhtml")
{
    header("Content-Type: text/xml");
 
    $message = 
    "<?xml version=\"1.0\" encoding=\"UTF-8\" ?>
    <!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">
    <html xmlns=\"http://www.w3.org/1999/xhtml\">
    <head><title>Testing</title></head>
    <body>
        <div id=\"rating\">$rating</div>
        <div id=\"average\">$average</div>
        <div id=\"votes\">$votes</div>
    </body>
    </html>
    " ;
 
}
else if ($response == "json")
{
    header("Content-Type: application/json");
    require_once('JSON.php');
    $json = new Services_JSON();
    $jsonResponse = new ResponseData();
    $jsonResponse->rating = $rating;
    $jsonResponse->votes = $votes;
    $jsonResponse->average = $average;
 
    $message = $json->encode($jsonResponse);
}
else if ($response == "yaml")
{
    header("Content-Type: text/x-yaml");
    require_once('spyc.php');
    
    $yamlResponse = new ResponseData();
    $yamlResponse->rating = $rating;
    $yamlResponse->votes = $votes;
    $yamlResponse->average = $average;
    
    $message = Spyc::YAMLDump($yamlResponse);
}
else if ($response == "javascript")
{
    header("Content-Type: application/x-javascript");
    $message = "
        var responseOutput = document.getElementById(\"responseOutput\");
        responseOutput.innerHTML += 'Thank you for voting.  You rated this a <strong>$rating</strong>.  There are <strong>$votes</strong> total votes.  The average is <strong>$average</strong>.  You can see the ratings in the <a href=\"https://ajaxref.com/ch4/ratings.txt\" target=\"_blank\">ratings file</a>';
    ";
 
}
 
echo $message;
 
/* Helper functions */
function gpc($name)
{
    if (isset($_GET[$name]))
    return $_GET[$name];
    else if (isset($_POST[$name]))
    return $_POST[$name];
    else if (isset($_COOKIE[$name]))
    return $_COOKIE[$name];
    else
    return "";
}
 
function arrayIndex($array, $index)
{
    if (isset($array[$index]))
        return $array[$index];
    else
        return "";
}
 
function cleanVariable($originalVariable)
{
    return htmlentities(substr(urldecode($originalVariable),0,1024));
}
 
 
class ResponseData
{
    public $average = 0;
    public $rating = 0;
    public $votes = 0;
    public $total = 0;
}
 
?>