How to call Javascript on a Browser page from a .NET windows app?

[Charlie Brown]

Hi,

I am trying to call a javascript function on a page using the following code from a Windows app:
Dim objMSHTML2 As New mshtml.HTMLDocument
'I'm not sure what code should go in here
objMSHTML2.parentWindow.FunctionOnThePage("1")

The scenario is that the browser is already open on the page that contains the function being called ("FunctionOnThePage").

How do I tell objMSHTML2 to point to the browser instance that I want so that the function can be accessed?

Thanks in advance!

Regards,
CB

[TRScheel]

Hi,

I am trying to call a javascript function on a page using the following code from a Windows app:
Dim objMSHTML2 As New mshtml.HTMLDocument
'I'm not sure what code should go in here
objMSHTML2.parentWindow.FunctionOnThePage("1")

The scenario is that the browser is already open on the page that contains the function being called ("FunctionOnThePage").

How do I tell objMSHTML2 to point to the browser instance that I want so that the function can be accessed?

Thanks in advance!

Regards,
CB

I am not sure I understand what you want... is this right:

There is a browser already up, and you want to access it and run the function called FunctionOnThePage() thats loaded on that page?

[Charlie Brown]

That is correct.

Thanks,
CB

I am not sure I understand what you want... is this right:

There is a browser already up, and you want to access it and run the function called FunctionOnThePage() thats loaded on that page?

[kenobewan]

Have you tried attributes.add("onclick", FunctionOnThePage())?

[Charlie Brown]

Hi again,

Just to clarify. The situation is that I am trying to fire off a JavaScript function on a page that is from a third party (i.e. I can't make any changes to it).

Let's say that the JavaScript function "FunctionOnThePage()" is something on www.yahoo.com. How do I call that from my Windows app?

Hope that's clearer.

Thanks again!
- CB

[TRScheel]

Hi again,

Just to clarify. The situation is that I am trying to fire off a JavaScript function on a page that is from a third party (i.e. I can't make any changes to it).

Let's say that the JavaScript function "FunctionOnThePage()" is something on www.yahoo.com. How do I call that from my Windows app?

Hope that's clearer.

Thanks again!
- CB

Well I know you can do javascript injection from the address bar... hence, you could do something like

javascript: alert("Hello");

in the address bar, and you would get a nice little pop up message. Now manipulating that programatically would be a bit tricky.

One thing I need to know, does this need to be ran on a running instance of say, IE7, or can this exist entirely in the realm of your program? The difference lies here:

If you are manipulating an running instance of IE7 it could be very difficult unless there is something available I am not aware of, BUT if its ok that this runs entirely inside your executable, you should be able to do this fairly easily.

[Frinavale]

Hi again,

Just to clarify. The situation is that I am trying to fire off a JavaScript function on a page that is from a third party (i.e. I can't make any changes to it).

Let's say that the JavaScript function "FunctionOnThePage()" is something on www.yahoo.com. How do I call that from my Windows app?

Hope that's clearer.

Thanks again!
- CB

JavaScript functions are usually specific to the web page that they are embedded into. They are used to manipulate things on the Client Side (not Server Side).

I do not think it is possible to do what you are asking without some piece of malicious code. This is not a good idea, its unethical, and it will get you into trouble.

What exactly are you trying to capture from this JavaScript?
Why can't you write your own JavaScript that is specific for your program?
By writing your JavaScript, you can set a hidden variable on your page which can be accessed by your server side code...and this will keep you from trouble.

-Frinny