Presentation of a PHP-based solution to cross-domain AJAX requests.
References:
There are ways to handle AJAX requests on the same domain, such as:
Or using IFRAMES to allow for cross-domain reqeusts, such as:
The following:
uses an intermediate PHP script as buffer.
maintains the integrity of the browser domain, while allowing for cross-domain script access.
[notice]<! — example.html — !>[/notice]
<script type=”text/javascript”>
// http://code.google.com/p/json-simple/wiki/JSPAndAJAXExamples
function createXMLHttpRequest()
{
var xmlhttp, bComplete = false;
try { xmlhttp = new ActiveXObject(“Msxml2.XMLHTTP”); }
catch (e) { try { xmlhttp = new ActiveXObject(“Microsoft.XMLHTTP”); }
catch (e) { try { xmlhttp = new XMLHttpRequest(); }
catch (e) { xmlhttp = false; }}}
if (!xmlhttp) return null;
this.connect = function(sURL, sMethod, sVars, fnDone)
{
if (!xmlhttp) return false;
bComplete = false;
sMethod = sMethod.toUpperCase();
try {
if (sMethod == “GET”)
{
xmlhttp.open(sMethod, sURL+”?”+sVars, true);
sVars = “”;
}
else
{
xmlhttp.open(sMethod, sURL, true);
xmlhttp.setRequestHeader(“Method”, “POST “+sURL+” HTTP/1.1″);
xmlhttp.setRequestHeader(“Content-Type”,
“application/x-www-form-urlencoded”);
}
xmlhttp.onreadystatechange = function(){
if (xmlhttp.readyState == 4 && !bComplete)
{
bComplete = true;
fnDone(xmlhttp);
}};
xmlhttp.send(sVars);
}
catch(z) { return false; }
return true;
};
return this;
}
function example()
{
//CALL LOCAL AJAX
file = “/local.php”;
//CREATE CONNECTION
var request = createXMLHttpRequest();
if ( !request ) {
alert( request )
return false;
}
//DEFINE HANDLER METHOD
var callback = function( oXML ) {
alert(oXML.responseText);
}
//RUN SCRIPT
request.connect(
file,
‘POST’,
‘var=’ + val,
callback
);
return;
}
</script>
<! — END example.html — !>
[notice]<! — local.php — !>[/notice]
<?php
class local {
public function local() {
//CALL FUNCTION ON ANOTHER DOMAIN
$url = “http://some.other.domain/remote.php?var=”.$_POST[‘var’];
//BUFFER
ob_start();
readfile($url);
$content = ob_get_contents();
ob_end_clean();
//RETURN to example.html
echo $content;
}
}
$local = new local();
?>
<! — END local.php — !>
[notice]<! — remote.php — !>[/notice]
<?php
class remote {
public function remote() {
//RETURN to local.php
echo $_GET[‘var’];
}
}
$remote = new remote();
?>
<! — END remote.php — !>
, football anyone?