Coming from Webbrowser , Winforms DOM Document Access in Webview2 Clearing of Cookies Inprivate

[igotbass]

Sorry if this has been discussed before, i cannot find the subject anywhere.

webbrowser.document object what is the equivalent in Webview2 ?
Can we access the DOM like we did with webbrowser control ?

How can all of the cookies and user data be cleared when the winform program is run ?
All of the cookies and data are still in the browser from prior sessions ?
with Webbrowser control we used wininet method

public static bool SupressCookiePersist()
{
// 3 = INTERNET_SUPPRESS_COOKIE_PERSIST
// 81 = INTERNET_OPTION_SUPPRESS_BEHAVIOR
return SetOption(81, 3);
}

    public static bool EndBrowserSession()
    {
        // 42 = INTERNET_OPTION_END_BROWSER_SESSION 
        return SetOption(42, null);
    }

    static bool SetOption(int settingCode, int? option)
    {
        IntPtr optionPtr = IntPtr.Zero;
        int size = 0;
        if (option.HasValue)
        {
            size = sizeof(int);
            optionPtr = Marshal.AllocCoTaskMem(size);
            Marshal.WriteInt32(optionPtr, option.Value);
        }

        bool success = InternetSetOption(0, settingCode, optionPtr, size);

        if (optionPtr != IntPtr.Zero) Marshal.Release(optionPtr);
        return success;
    }

This does not work with Webview2, is there any way to get a fresh browser session when the program is executed ????

Any help would be appreciated.

AB#28556146

[ukandrewc]

There isn't a DOM (Document) implementation for WebView2, but I am working on one here.

[igotbass]

There isn't a DOM (Document) implementation for WebView2, but I am working on one here.

There is no native way to access DOM objects from Winforms app ?
How is that even possible ?

[ukandrewc]

Create a .Net DOM framework and update it from JS.

[igotbass]

Create a .Net DOM framework and update it from JS.

The documentation does not explain how to get values out of the control into .net. I mean this is the most basic functionality of a webbrowser control ? How is this not explained in depth in the documentation?

[ukandrewc]

It is far more flexible and cross browser/platform and more secure to do it in JS.
It is explained how to communicate between .Net and JS, it's up to us what we do with it.

[david-risney]

Hi @igotbass, thanks for these great questions! Looks like we need some documentation regarding how to interact with the DOM.

@igotbass, Regarding interacting with the DOM, yes what @ukandrewc is true. You can use ExecuteScript to execute script and you'll get back the result of that script as JSON. Or you can use PostWebMessageAsJson/chrome.webview.addEventListener('message',...) to send messages into the document and chrome.webview.postMessage/WebMessageReceived to send messages from the document back to the host app.

Regarding clearing cookies or other state, that's a great feature request which we don't support yet.

To get a fresh browser session, when you create the CoreWebView2Environment you specify the user data folder. The user data folder holds all state including cookies, http cache, and so on. If you delete the user data folder or specify a new user data folder you will get a fresh environment.

[igotbass]

Hi @igotbass, thanks for these great questions! Looks like we need some documentation regarding how to interact with the DOM.

@igotbass, Regarding interacting with the DOM, yes what @ukandrewc is true. You can use ExecuteScript to execute script and you'll get back the result of that script as JSON. Or you can use PostWebMessageAsJson/chrome.webview.addEventListener('message',...) to send messages into the document and chrome.webview.postMessage/WebMessageReceived to send messages from the document back to the host app.

Regarding clearing cookies or other state, that's a great feature request which we don't support yet.

To get a fresh browser session, when you create the CoreWebView2Environment you specify the user data folder. The user data folder holds all state including cookies, http cache, and so on. If you delete the user data folder or specify a new user data folder you will get a fresh environment.

So if I want something as simple as the oldschool webbrowser.document.getelementbyid("xxx").value its now a massive process to get a element value ?

[ukandrewc]

I suppose that's part of the point, this is newschool ;-) but if you use this version that implements a DOM.

It is still a work in progress, so don't expect too much, but you can access most of Window, Document, Element, Attribute, Style and Node.

[igotbass]

I suppose that's part of the point, this is newschool ;-) but if you use this version that implements a DOM.

It is still a work in progress, so don't expect too much, but you can access most of Window, Document, Element, Attribute, Style and Node.

Ok thanks I will check it out.

[igotbass]

I just tried @ukandrewc browser and this is the functionality that MUST be built into webview2 from MS, not exactly sure how a 3rd party has managed to put this together but we should not have to inject javascript to get a simple value of a element. Webbrowser control 1 line of code

string TheValue = webbrowser1.document.getelementbyid("xxx").value

Now its setting up and receiving JSON messages ect, guys this should be basic functionality of the control, hands down.

Thanks

[ukandrewc]

not exactly sure how a 3rd party has managed to put this together

Ones and zeros, that's all there is to it. At least until we have quantum processing, then it will be ones and or possibly maybe zeros (ah now you've looked at it, so we'll have to start again ;-)

[mphacker]

100% agree that having DOM access without having to do a bunch of Javascript injecting is the right way to do it. I hope they incorporate what @ukandrewc has created.