[Webkit-unassigned] [Bug 64572] Initial implementation of calling WebScriptObject::callWebScriptMethod() via COM

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=64572





--- Comment #17 from Anthony Johnson <anthony.johnson at flexsim.com>  2011-08-16 12:30:57 PST ---
Adam,
I've looked through the JavaScriptCore API (http://developer.apple.com/library/mac/#documentation/Carbon/Reference/WebKit_JavaScriptCore_Ref/javascriptcore_fw-datatypes.html), and there are some primary things that I can't figure out how to do for my application if it's to access the JavaScriptCore API directly. First, let me explain what I want my application to do.

The goal is for our c++ windows client application to display real time graphs within the client application, i.e. bar charts, line charts, histograms, pie charts, etc. as a simulation runs. Then we also want to make those graphs and charts accessible remotely, i.e. a browser connects to our application which is acting as a server, and the application sends data to the browser that essentially renders those bar charts the same as they look in the client application.

So our solution is to have a "web widget" in the client application, that is essentially an html canvas that draws a chart. The canvas DOM element is given methods such as updateData(), which updates the data to be drawn. From the c++ side, when the client application wants to update the chart data, it gets a reference to the canvas DOM element (DOMDocument::getElementById()), and then calls the updateData method on that DOM element, passing in the appropriate parameters.

At this point our client application works as designed above. We are just now getting into moving that to a remote server scenario. But the idea is once we've designed the client app's chart widget, the remote widget will be almost exactly the same code, i.e. a canvas DOM element that has some methods on it that are called to update the chart display, albeit this time through some HTTP/AJAX request/response mechanism.

So, for our given design, here are the things we need:
1. An HTML/CSS/JavaScript-based window, with it's associated DOM structure.
2. When we want to update the display, we need to get reference to DOM elements.
3. We need to call javascript methods on those elements.
4. Right now we are running everything through the COM-API provided.

For the JavaScriptCore API I wasn't able to find anything that allowed me to get the JSObject that is associated with the DOM element in an html document. I think once I have that, I could use the JavaScriptCore API; I just don't see how to tap into the DOM/JSObject binding. Perhaps it might work if the javascript methods are global, but how to get global javascript in an html document using the JavaScript Core API? The other issue is, I don't know exactly how to get access to the JavaScriptCore API via the COM API, as I don't see interfaces that bridge the gap.

Anyway, thanks for your time and help, and any design suggestions here are more than welcome.

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