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/*--------------------------------------------------------------------------------
AJAX Queue
----------------------------------------------------------------------------------*/
var AJAXQueue = new Array;
var AJAXServiceRunning=false;
var AJAXReturnfunction;
var httpAjax = false;
function getSVG(fileName) {
paramstr="svgname="+escape(fileName);
AjaxService("svgtocanvas.php",paramstr,"returnedSVG");
}
/*--------------------------------------------------------------------------------
AjaxService
This is the only interface to the AJAX wrapper. This makes the ajax service
browser agnostic and provides a single interface for all of the services.
Each service uses a different url and a different parameter layout.
----------------------------------------------------------------------------------*/
function AjaxService(servicename,serviceparam,returnfunction) {
AJAXQueue.push(servicename);
AJAXQueue.push(serviceparam);
AJAXQueue.push(returnfunction);
if( !AJAXServiceRunning ) {
AJAXServiceRunning = true;
AJAXReturnfunction = AJAXQueue.pop();
var Aparam = AJAXQueue.pop();
var Aservice = AJAXQueue.pop();
AjaxServiceExec( Aservice, Aparam );
}
}
/*--------------------------------------------------------------------------------
AjaxService
This is the only interface to the AJAX wrapper. This makes the ajax service
browser agnostic and provides a single interface for all of the services.
Each service uses a different url and a different parameter layout.
----------------------------------------------------------------------------------*/
function AjaxServiceExec(servicename, serviceparam) {
// Parameters are set, initiate AJAX engine
if( window.XMLHttpRequest ) {
httpAjax = new XMLHttpRequest();
if( httpAjax.overrideMimeType ) {
httpAjax.overrideMimeType( 'text/xml' );
}
} else if ( window.ActiveXObject ) {
try{
httpAjax = new ActiveXObject( "Msxml2.XMLHTTP" );
} catch(e) {
try {
httpAjax = new ActiveXObject( "Microsoft.XMLHTTP" );
} catch(e) {
alert( "CouldnŽt build an AJAX instance." );
return false;
}
}
}
// Send request to Server and initiate callback.
try{
httpAjax.onreadystatechange = getPage;
}
catch(e) {
alert( "onreadystatechange didnŽt go well!" );
return false;
}
try{
httpAjax.open( 'POST', servicename, true );
httpAjax.setRequestHeader( "Content-Type", "application/x-www-form-urlencoded;" );
}
catch(e) {
alert( "CouldnŽt open url." );
return false;
}
try{
httpAjax.send( serviceparam );
}
catch(e) {
alert( "CouldnŽt send request." );
return false;
}
return true;
}
/*--------------------------------------------------------------------------------
getPage
This is the AJAX callback function. It detects the invoking service and handles
the reply from each service accordingly.
----------------------------------------------------------------------------------*/
function getPage() {
if(httpAjax.readyState == 4) {
tr = httpAjax.responseText;
eval( AJAXReturnfunction + '(tr);' );
if( AJAXQueue.length > 0 ) {
AJAXReturnfunction = AJAXQueue.pop();
var Aparam = AJAXQueue.pop();
var Aservice = AJAXQueue.pop();
AjaxServiceExec( Aservice, Aparam );
} else {
AJAXServiceRunning = false;
}
return true;
} else {
// If any other ready state than prepared, do nothing!
}
}
function returnedSVG( htmltext ) {
var conto = document.getElementById( 'content' );
conto.innerHTML = htmltext;
str = 'var acanvas=document.getElementById("previewCanvas");acanvas.width=700;var c=acanvas.getContext("2d");' + htmltext;
eval(str);
}
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