Q: How to get at controls of type or name

[mwpowellhtx]

I see the leading indicator tends ot be id where possible, and that's a good start. However, I have a case where I need by type and then by name, both of which I have inspected toward, and verified, at least for the moment. Is it possible to identify such controls, maybe by injecting some sort of selector?

[mwpowellhtx]

Ah, yes, 💡 right along the lines what I am after, after digging a bit further into the documentation documentation... "input[name='...'].

[mwpowellhtx]

Maybe spoke too soon, or my current setup is insufficient. I adopted the package references, starting with context. But getting exception.

I am trying to respond async to an ICommand RelayCommand (CommunityToolkit.Mvvm), so far so good, except not quite.

System.Exception: 'IBrowserHost instance is null. Browser has likely not finished initializing or is in the process of disposing.'

Exception thrown while attempting the dev tools context.

var context = await Wrapper.Browser.CreateDevToolsContextAsync();

var ctrlUsername = await context.QuerySelectorAsync<HtmlInputElement>("...");
var ctrlPassword = await context.QuerySelectorAsync<HtmlInputElement>("...");
var btnSubmitLogin = await context.QuerySelectorAsync<HtmlInputElement>("...");
var cbRememberMe = await context.QuerySelectorAsync<HtmlInputElement>("...");

await context.DisposeAsync();

Not even to the query selector part yet, but I am fairly confident my query strings are accurate. The only questions might be how to operate a <button/>, or a checkbox, or <input/> text into username and password inputs. I assume they are more than HtmlInputElement, for instance, but have not crossed that threshold just yet.

In terms of my browser window setup. I have verified, I am loading the desired target address. I have the WPF Window instance being created, and the wrapper instance has the Browser control named, both are not null. But when I try to engage through the Browser instance, that is when it gets thrown.

My aim is for the browser window to remain hidden, pretty much, but I might like to show the window when engaging with it. Is that supported, or maybe because it is hidden, some instances are falling from scope, and thus being disposed of prematurely (?).

[mwpowellhtx]

It's definitely throwing here:

var browserHost = chromiumWebBrowser.GetBrowserHost();

if (browserHost == null)
//  ^^^^^^^^^^^^^^^^^^^
{
    CefSharp.WebBrowserExtensions.ThrowExceptionIfBrowserHostNull(browserHost);
}

And which is because BrowserCore is null.

return browser.BrowserCore?.GetHost();
//             ^^^^^^^^^^^

[mwpowellhtx]

Related discusion.

[mwpowellhtx]

Problem sorted. Key notes:

1. Host window Visibility toggled to Visible from Hidden, and do appropriate wait, await Wrapper.Browser.WaitForRenderIdleAsync()
2. Ensure that selector query string integrity is sound; as long as it works in Chrome console, it should "just work" here. And it does, i.e. await context.WaitForSelectorAsync(selPassword, opts), or var ctrlPassword = await context.QuerySelectorAsync<HtmlInputElement>(selPassword), for instance,
3. Also works beautifully setting input value, different from text inner or outer, or checking a checkbox input, or clicking a button input via selector query string.

From there forward, rinse and repeat, the results are only as good as the document being queried, so know thy domain, and so forth.