How to detect Javascript execution in WebBrowser control

On the webbrowser load event,

1. Inject Jquery
2. Inject Monitor scripts

,

private void addScript(HtmlElement head, string scriptSource) 
{ 
HtmlElement lhe_script = head.Document.CreateElement("script"); 
IHTMLScriptElement script = (IHTMLScriptElement)lhe_script.DomElement; 
script.src = scriptSource;
head.AppendChild(lhe_script);            
} 

addScript(Webbrowser.Head, @"<Change File Path here>jquery.min.js");
addScript(WebBrowser.Head, @"InjectMonitor.js");

your file InjectMonitor.js should be something like this

 $(document).ready(function () { 
        //Add click event for every anchor on the page loaded- note this merely alerts text on click. you can however add your own function
        $("a").click(function (e) { alert($(this).text()); return false;}) 
    }); 

Well what krishna has answered is interms of pure javascript attaching to events, however i see that you might need to attach it to all the tags(a,p,div,input) etc and to all the events attached to each tag.

i believe the another way is to play around with the BHO(browser helper object) available to your in .net, and if not and you are good at VC++ and MFC you can also play around with Windows Hooks.

You can use window.external to call a C# method when a global function is fired in JavaScript. See WebBrowser Control Overview for details on window.external.

You'll need to set ObjectForScripting: Webbrowser control's window.external is ALWAYS null. for this to work.

Take @Krishna's answer to add the JavaScript (but drop jQuery because it won't be needed):

private void addScript(HtmlElement head, string scriptSource) 
{ 
HtmlElement lhe_script = head.Document.CreateElement("script"); 
IHTMLScriptElement script = (IHTMLScriptElement)lhe_script.DomElement; 
script.src = scriptSource;
head.AppendChild(lhe_script);            
} 

addScript(WebBrowser.Head, @"InjectMonitor.js");

The JavaScript below (InjectMonitor.js) will find all global functions and attach your specified handler:

function augment(withFn) {
    var name, fn;
    for (name in window) {
        fn = window[name];
        if (typeof fn === 'function') {
            window[name] = (function(name, fn) {
                var args = arguments;
                return function() {
                    withFn.apply(this, args);
                    fn.apply(this, arguments);

                };
            })(name, fn);
        }
    }
}

augment(function(name, fn) {
    console.log("calling " + name, fn);

    // window.external.yourC#method
});

In this example, taken from Adding Console Log to Every Function, it just logs the call to console; but using window.external you could send some message back to your C# application with details of what function was called from the client.

Finally, here's a JS Bin example (run it and don't forget the console): JS Bin Example