Go Premium for a chance to win a PS4. Enter to Win


com event handler in javascript vs. vbscript

Posted on 2013-12-16
Medium Priority
Last Modified: 2013-12-31
I have created a com object that raises events.  It works and I have been able to test it in vbs.  the events are raised like this:

set obj = WScript.CreateObject("TestObj.Agent", "agent_")  'create the object

Sub agent_AgentEvent(val)
      MsgBox "Event fired - val is " & val
End Sub

the event handler is a sub in vbscript.  how do I do this in javascript?
Question by:dhenderson12
  • 3
  • 3
  • 2
LVL 75

Expert Comment

by:Michel Plungjan
ID: 39723282
Without having used WScript.CreateObject myself, I would translate it to this

var obj = WScript.CreateObject("TestObj.Agent", "agent_");  //create the object

function agent_AgentEvent(val) {
  alert("Event fired - val is " + val);

Author Comment

ID: 39723893
thanks for the response.  I ask the question incorrectly. I was looking for a way to translate the sub procedure that vbscript uses for the event handler to javascript.  I am trying to put this com object on a web page, but used windows script host to test my object first.

that being said, I put the object on the web page and cannot get the events.  here is my code:

<script type="text/javascript">
        var ica = new ActiveXObject("TestObj.Agent");
        var ok = ica.Init();
        var sm;

        if (ok)
            sm = "OK";
            sm = "Failed";



        ica.SetAgentState("Available", ica.NewSessionId);

        function ica_AgentEvent(val) {
            alert("Event fired - val is " + val);

Open in new window

LVL 75

Expert Comment

by:Michel Plungjan
ID: 39723995
This would only work in ie - and would need permission by the user - did you look in the console?
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!


Author Comment

ID: 39736283
sorry, all, for the delay in answering.  this is an intranet site and is limited to IE, so that's not an issue.

bottom line is my com object raises events that can be handled by client side vbscript, but I would like to have the event handler in javascript and I don't know how to do that.  I have posted what i have tried above and can't get any further than that.  how can I get an event handler for the com object in javascript?
LVL 43

Expert Comment

ID: 39737027
This shows how instantiate your ActiveX object using JavaScript.

However, it would worth using following tool to make sure your object reference is correct. When you'll run it you'll be able to see the objects available to ie.

Author Comment

ID: 39737917
thx for the reply, tagit, but that's not the question.  I can instantiate the object and call the exposed methods and properties on the object just fine.  the question is event handling.

the object is put on the page using the <object> tag and guid.
the object raises events.
the event handler is written in vbscript on the page and works just fine.

the question is how can I get the event handler in javascript instead of vbscript?
LVL 75

Accepted Solution

Michel Plungjan earned 2000 total points
ID: 39738395
Almost the same way

var obj = document.getElementById("yourObjectID");

obj.onSomeEvent=function() {
  alert("someEvent triggered");
LVL 43

Expert Comment

ID: 39739347
It sounded from your comments you wanted to instantiate the object using javascript.  

Assuming the object is inserted into the page in your object tags, you should still be able to capture the events with javascript as mplungjan has indicated.

Can you post your object tag and the events you want javascript to capture.

I have to ask though, why do you want to use javascript when vbscript works fine??  This is only going to work in IE as has already been said.

Featured Post

How to Use the Help Bell

Need to boost the visibility of your question for solutions? Use the Experts Exchange Help Bell to confirm priority levels and contact subject-matter experts for question attention.  Check out this how-to article for more information.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Having worked on larger scale sites, we found out that you are bound to look at more scalable solutions to integrating widgets, code snippets or complete applications and mesh them into functional sites, in any given composition. To share some of…
Today, the web development industry is booming, and many people consider it to be their vocation. The question you may be asking yourself is – how do I become a web developer?
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…
Suggested Courses

926 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question