Issue encountered while retrieving information from XML file through AJAX

I am facing an issue while using AJAX to fetch data from an external XML file. The error I receive is "Invalid argument" and I am working with IE 8.

Below is the code snippet:

var xhr;
 xhr = new XMLHttpRequest();      

xhr.open("GET","C:/Users/abc/Desktop/Project/POC/ajax/Data.xml", false);

 xhr.onreadystatechange = function ()
 { 
 if (xhr.readyState===4 && xhr.status===200)
 {  
 var items = xhr.responseXML.getElementsByTagName('name'); 
 var output = '<ul>'; 
 for (var i=0; i<items.length; i++)
 output += '<li>' + items[i].firstChild.nodeValue + '</li>'; 
 output += '</ul>';  
 var div = document.getElementById('update');
 div.innerHTML = output;
 }
 }
 xhr.send(); 

The highlighted line is causing the error. Any suggestions on how to resolve this? Thank you in advance.

Answer №1

It is recommended to use url instead of path. For example, make the change :

xhr.open("GET","C:/Users/abc/Desktop/Project/POC/ajax/Data.xml", false);

to something like this:

xhr.open("GET","http://localhost/your_Project/POC/ajax/Data.xml", false);

Answer №2

In order for AJAX requests to function properly, the sources must be hosted on a server as file-based URLs will not work with XMLHttpRequest calls.

Answer №3

When initiating a request to the server for XML using GET, it's important to note that GET only supports HTTP requests, which may result in an error being thrown.

To rectify this issue, one viable solution would be to include the XML file within the solution or web deploy directory and then attempt to make the request via the browser address bar. If the request is successful through the browser, you can then proceed to implement it with your XHR object.

Answer №4

To ensure smooth functioning, it is recommended to place the xml file on a web server and direct your xhr target to the file's URL. For example:

xhr.open("GET","http://yourwebsite.com/yourpath/Data.xml", false);

Additionally, the basic HTML file containing your JavaScript code should also be hosted on the same web server:

http://yourwebsite.com/yourpath/basic.html

Due to the Same Origin Policy restrictions, AJAX requests cannot be sent from the file system to a web server URL. However, you can send requests from one server to another as long as both servers share the same origin, such as:

http://yourwebsite.com

Remember to keep these considerations in mind for successful implementation.

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