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How to fire events from HTML into Application

Posted on 2001-06-08
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Last Modified: 2007-11-27
I have an application with CHtmlView , i want to be able to fire events into the mainapp , like clicking on a button on hyperlink calls a function within my App, just like what we have in Search window on Windows 2000.

I have looked into IHTMLDocument interface but the documentation was confusing for me , any suggestions or samples ???

I can only offer 75 points now cause that is all i have...
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Question by:neo77
8 Comments
 

Author Comment

by:neo77
ID: 6167502
I am willing to create a COM object for this if required
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Expert Comment

by:robertmitchell_99
ID: 6167561
Hi NEO77,

Its a bit tricky but this is how its done.

in your html file add a javascript function like this

<SCRIPT LANGUAGE=javascript>
<!--
function button1_onclick() {
location.href="#MyMessage";
}
</SCRIPT>

Basically, what this does is send a message to the browser to go to the internal file bookmark MyMessage.

As there is no MyMessage this message is passed on to the CHTMLView


in your CHTMLView implementation, implement the function:

CHTMLView::OnBeforeNavigate2( LPCTSTR lpszURL, DWORD nFlags, LPCTSTR lpszTargetFrameName, CByteArray& baPostedData, LPCTSTR lpszHeaders, BOOL* pbCancel )

The lpszURL contains the messages sent from the html file through the browser object so handle it like so

     if (NULL != strstr(lpszURL, "MyMessage"))
     {
         // put your handling in here
     }

Best of luck,

Robert
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Author Comment

by:neo77
ID: 6180063
Sure does serve the purpose i'll give you the points if nothing else shows up , i am waiting if someone could give final remarks about if its possible through IHTMLDocument or not ... sorry but i have to keep the discussion open for now
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Expert Comment

by:peterchen092700
ID: 6244882
Add an handler for OnBeforeNavigate2, check the URL parameter, set pbCancel to true, and run "your own" action

(it's likely that you need to decouple this operation, i.e. not call a NavigateTo or something from inside the OnBeforeNavigate handler, but post a message to yourself, and do the action in the message handler)

Helped?
Peter
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Author Comment

by:neo77
ID: 6296964
is it possible to expose methods from the application to the page , i.e.  i be able to call a method that is in the application from javascript code in page ?
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Accepted Solution

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peterchen092700 earned 300 total points
ID: 6297942
a) yes, using the "external" property of IHTMLWindow2
b) yes, by embedding an activex control on the page.

a) seems recommended,
should be window.external, or document.parentWindow.external, in scripting languages.

You create a component that does the stuff you want/need. The application hosting the HTMLView creates an instance of this, and provides this as "External Dispatch" interface to the view.  (ATL's CAxWindow has a "SetExternalDispatch" method, I'm not sure how to do this in MFC, but there's a sample for this on http://msdn.microsoft.com/downloads/samples/internet/browser/driller/default.asp

Peter








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Expert Comment

by:peterchen092700
ID: 6715155
>> is it possible to expose methods from the application to the page

yes, there's a DRILLER example in MSDN  that show how to
(basically, you can set an external dispatch interface - from ATL it's CAxWindow::SetExternalDispatch - and call into it using window.external.Foo() from jscript)

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