HOWTO: Trap JScript Errors on a Web Page

ID: Q183616

The information in this article applies to:

Microsoft JScript, versions 1.0, 2.0, 3.0
Microsoft Internet Explorer (Programming) versions 5.0, 3.0, 3.01, 3.02, 4.0, 4.01

SUMMARY

There is currently no language support for error handling in JScript. However, when using JScript in a Web page, there is a window.onerror() event, which you can use to trap errors and handle them as you wish.

MORE INFORMATION

The following HTML demonstrates how to use the onerror event of the window object to trap an error in JScript code:


<HTML>
 <HEAD>
 <META NAME="GENERATOR" Content="Microsoft Visual Studio 6.0">
 <TITLE>Window onerror event with JScript</TITLE>
 </HEAD>
 <script language=JavaScript>
 function errorHandler(message, url, lineno)
 {
 alert("oops: message");
 return true;
 }
 window.onerror = errorHandler;
 new ActiveXObject("Non-existing");
 </script>
 <BODY>

 <P>This page will generate a scripting error while loading (you should see an alert box     instead of the standard script error message).</P>

 </BODY>
 </HTML>

REFERENCES

For information on using JScript, refer to the documentation available at the following Web site:

http://msdn.microsoft.com/scripting/

Additional query words:

Keywords : kbcode kbIE300 kbIE301 kbIE400 kbIE401 kbJScript100 kbJScript200 kbJScript300 kbIE302 kbIE500
Version : WINDOWS:1.0,2.0,3.0,3.01,3.02,4.0,4.01
Platform : WINDOWS
Issue type : kbhowto