JAVASCRIPT

Retrieving Hardware Information using Advanced JavaScript with Internet Explorer

This is the third article in a series focusing on retrieving hardware information using JavaScript and presenting the same on a web page. You can directly copy and paste the code samples presented in this article into a file with the extension “.htm” and open in Internet Explorer 5.5+.

Author Info:

By: Jagadish Chaterjee

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May 02, 2006

TABLE OF CONTENTS:

<!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_Keyboard");
      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.DeviceID + "</td>");
            document.write("<td>" + p.Layout + "</td>");
            document.write("<td>" + p.Name + "</td>");
            document.write("<td>" + p.NumberOfFunctionKeys + "</td>");
            document.write("<td>" + p.Status + "</td>");
            document.write("<td>" + p.Password + "</td>");
            document.write("<td>" + p.PNPDeviceID + "</td>");
            document.write("<td>" + p.Status + "</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>DeviceID</td>");
      document.write("<td>Layout</td>");
      document.write("<td>Name</td>");
        document.write("<td>NumberOfFunctionKeys</td>");
        document.write("<td>Status</td>");
      document.write("<td>Password</td>");
        document.write("<td>PNPDeviceID</td>");
        document.write("<td>Status</td>");
      document.write("</thead>");
}

//-->

            </script>
      </head>
      <body>
            <INPUT id="Button1" type="button" value="Button"
name="Button1" language="javascript" onclick="return Button1_onclick()">
      </body>
</html>

The above sample would automatically list the information related to the keyboard. It provides very useful information such as DeviceID, PNPDeviceID, layout, number of function keys and so forth. To make the above sample simple, I listed out only the most important information. You can retrieve much more information. To retrieve this information, I used a built-in class, “Win32_Keyboard.”

The “for” loop I used in the above code iterates for every keyboard (in fact, there would normally be only one keyboard) present with the system and finally retrieves only the properties of that keyboard.

Any comments, suggestions, bugs, errors, feedback etc. are highly appreciated at jag_chat@yahoo.com.

DISCLAIMER: The content provided in this article is not warranted or guaranteed by Developer Shed, Inc. The content provided is intended for entertainment and/or educational purposes in order to introduce to the reader key ideas, concepts, and/or product reviews. As such it is incumbent upon the reader to employ real-world tactics for security and implementation of best practices. We are not liable for any negative consequences that may result from implementing any information covered in our articles or tutorials. If this is a hardware review, it is not recommended to open and/or modify your hardware.