Solved

Loading asynchronous XML in javascript

Posted on 2007-11-19
4
607 Views
Last Modified: 2013-11-19
Hello,

Im using javascript to load a simple xml document, using the following code:

      //Name: loadXML
      //Purpose: To load xml at any location
      var xmlDoc;
      function loadXML(strPath) {
            
            //code for IE
            if(window.ActiveXObject) {
                  
                  xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
                  xmlDoc.async=false;
                  //xmlDoc.onreadystatechange = getXMLState;
                  xmlDoc.load(strPath);
                  return xmlDoc;
                  
                  } else if(document.implementation && document.implementation.createDocument) { // mozilla
                        
                        xmlDoc = document.implementation.createDocument("","",null);
                        xmlDoc.load(strPath);
                        return xmlDoc; // returning data before entire document is loaded
      
                        }
            
            }


And i am calling the code like so:

      //load the xml data
      var objXmlTmp = loadXML('/data/formData2.xml');
      
      //alert('Number of objXmlTmp nodes = ' + objXmlTmp.childNodes.length);
      
      //get the nodes
      var objXml = objXmlTmp.getElementsByTagName('list');
      
      //alert('Length of objXml nodes in top function = ' + objXml.length);

My problem is that if you uncomment the last alert statement, it will return "Length of objXml nodes in top function = 0", however if you additionally uncomment the first alert statement, the last alert statement will return "Length of objXml nodes in top function = 3". I am therefore convinced that this is because Firefox is calling the XML asynchronously, and by executing the alert statements the code is having enough time to finish loading the xml.

Can anyone help modify my code so that the firefox version also loads asychronously?

Thanks in advance
Al
0
Comment
Question by:partnershipdev
  • 3
4 Comments
 
LVL 75

Accepted Solution

by:
Michel Plungjan earned 500 total points
ID: 20313135
try this

http://www.webmasterworld.com/forum91/3517.htm
var oLoadedXML;

function loadXML(sImportXML) {

  if( window.ActiveXObject && /Win/.test(navigator.userAgent) ) {

    oLoadedXML = new ActiveXObject("Msxml.DOMDocument");

    oLoadedXML.async = false;

    oLoadedXML.onreadystatechange = function () {

      if (oLoadedXML.readyState == 4) parseXML();

    }

    oLoadedXML.load(sImportXML);

  }

  else if( document.implementation && document.implementation.createdocument ) {

    oLoadedXML = document.implementation.createdocument("","",null);

    oLoadedXML.async=false;

    var loaded = oLoadedXML.load(sImportXML);

    if (loaded) {

      parseXML();

    }

  }

  else {

    alert("Your browser can\'t handle this script");

    return;

  }

} 

Open in new window

0
 
LVL 75

Expert Comment

by:Michel Plungjan
ID: 20313162
where you have
function parseXML() {

  var objXml = oLoadedXML.getElementsByTagName('list');

  alert('Length of objXml nodes in top function = ' + objXml.length);

}

Open in new window

0
 

Author Comment

by:partnershipdev
ID: 20318655
Hi mplungian,

Thanks for your input. I didnt use the code exactly, but was able to use parts of it in my existing code which now works perfectly.

Probably the quickest response ive ever had on EE.

Cheers
Al
0
 
LVL 75

Expert Comment

by:Michel Plungjan
ID: 20319532
Ah..  I have been faster than that... If I knew the answer off the top of my head it could have been under 2 minutes ;)
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction Since I wrote the original article about Handling Date and Time in PHP and MySQL (http://www.experts-exchange.com/articles/201/Handling-Date-and-Time-in-PHP-and-MySQL.html) several years ago, it seemed like now was a good time to updat…
This article discusses how to create an extensible mechanism for linked drop downs.
The viewer will learn how to create and use a small PHP class to apply a watermark to an image. This video shows the viewer the setup for the PHP watermark as well as important coding language. Continue to Part 2 to learn the core code used in creat…
The viewer will learn how to create a basic form using some HTML5 and PHP for later processing. Set up your basic HTML file. Open your form tag and set the method and action attributes.: (CODE) Set up your first few inputs one for the name and …

920 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now