Advanced JavaScript with Internet Explorer: Retrieving Networking Configuration Information
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This is the second article in a series focusing on retrieving system (or client) information using JavaScript and presenting the same on a web page. You can directly copy and paste all of the code samples present in this article into a file with extension “.htm” and open them in Internet Explorer 5.5+.
How to list all IP addresses for a computer using JavaScript
Now, let us try to develop a simple script (JavaScript) which shows the technique for retrieving all of the IP addresses for a computer. The entire code for the sample is as follows:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title></title>
<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1">
<meta name="vs_targetSchema" content="http://schemas.microsoft.
com/intellisense/ie5">
<script id="clientEventHandlersJS" language="javascript">
<!--
function Button1_onclick() {
var locator = new ActiveXObject ("WbemScripting.SWbemLocator");
var service = locator.ConnectServer(".");
var properties = service.ExecQuery("SELECT * FROM Win32_NetworkAdapterConfiguration");
var e = new Enumerator (properties);
document.write("<table border=1>");
dispHeading();
for (;!e.atEnd();e.moveNext ())
{
var p = e.item ();
document.write("<tr>");
document.write("<td>" + p.Caption + "</td>");
document.write("<td>" + p.Description + "</td>");
document.write("<td>" + p.DHCPEnabled + "</td>");
document.write("<td>" + p.DHCPServer + "</td>");
document.write("<td>" + p.DNSDomain + "</td>");
document.write("<td>" + p.DNSHostName + "</td>");
if (p.IPAddress!=null )
document.write("<td>" + p.IPAddress(0) + "</td>");
else
document.write("<td></td>");
document.write("</tr>");
}
document.write("</table>");
}
function dispHeading()
{
document.write("<thead>");
document.write("<td>Caption</td>");
document.write("<td>Description</td>");
document.write("<td>DHCPEnabled</td>");
document.write("<td>DHCPServer</td>");
document.write("<td>DNSDomain</td>");
document.write("<td>DNSHostName</td>");
document.write("<td>IPAddress</td>");
document.write("</thead>");
}
//-->
</script>
</head>
<body>
<INPUT id="Button1" type="button" value="Button"
name="Button1" language="javascript" onclick="return Button1_onclick()">
</body>
</html>
In the above code, “meta” tags are not necessary. They have been automatically added by Visual Studio. The above would automatically list all IP addresses belonging to a computer along with caption, description, DHCP info and DNS info. To retrieve this information, I used a built-in class, “Win32_NetworkAdapterConfiguration.” The class internally has a lot of properties, methods and events. But, in the above example we concentrated only on some limited properties, related to the “Win32_NetworkAdapterConfiguration” class.
The “for” loop I used in the above code iterates for every logical network adapter present in the system and finally retrieves only the properties of that adapter.
Next: How to retrieve MAC address and other extended network information using JavaScript >>
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