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Viewing changes to trunk/svg Converter/SVG_httpAjax.js

  • Committer: Henrik G.
  • Date: 2013-03-26 23:22:55 UTC
  • Revision ID: henrik.gustavsson@his.se-20130326232255-ik6snyatlbkf3zs1
First seed of Lenasys ... Needs to be Organized Further

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