intercepting arbitrary javascript function calls

[mrp]

Sorry if this has been answered previously. I did search but nothing showed up.

I am wondering how I can intercept arbitrary javascript function calls in CEF, not just the ones bound to the window object. What I am looking for is a way to intercept js calls and modify their behavior on the native side.

Thanks,
mrp

[magreenblatt]

In JavaScript you can modify the prototype of standard objects to call your method instead.

[mrp]

Can you explain how that can be done in the render process? To be clear, I am calling a function, say foo() as soon as the DOM is loaded (from jQuery's $(document.ready()). But I want to intercept the call to "foo" from C++ native and call bar() javascript function instead. How can I do that?

Thanks.

[ViswanathCt]

As stated above you could use js to hijack specific calls. For example, if you want to intercept foo(), so that it should call the function interceptor(), every time it's called; you can do the following:

Code: Select all


var _foo = foo
, foo = function() {

  interceptor();
  _foo();
}



But if you want to intercept arbitrary functions, without js; I guess it falls beyond the scope of CEF. You might need to work with Chromium or V8.

[mrp]

But if you want to intercept arbitrary functions, without js; I guess it falls beyond the scope of CEF. You might need to work with Chromium or V8.

I am confused by the above statement. I thought V8 is also part of CEF. No?

I am familiar with how to modify function behavior in js but I want to intercept the call in the CEF render process, if it is possible.

Thanks.

[magreenblatt]

You can't intercept arbitrary JS object/function calls with C++, but you can intercept specific ones. For example, replace the default JS object with your custom interceptor object that calls a natively bound C++ function for each JS function.

[mrp]

You can't intercept arbitrary JS object/function calls with C++, but you can intercept specific ones. For example, replace the default JS object with your custom interceptor object that calls a natively bound C++ function for each JS function.

Thank you. I figured as much. I also realized that if I provide an implementation in javascript the V8 handler wont be invoked. It took me a while to figure it out the hard way. Is this documented somewhere?

Again thanks for all the replies.

[magreenblatt]

Is this documented somewhere?

https://code.google.com/p/chromiumembed ... ntegration