Retrieving Hardware Information using Advanced JavaScript with Internet Explorer - How to retrieve a computer's keyboard information using JavaScript
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Now, let us try to develop a simple script (JavaScript) which shows how to display the information related to the keyboard. 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_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.
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