Without Loading no QuerySelectorAllAsync

[Mephisto090]

hey developer, :)

I'm loading the URL of a webpage through Form Show.

Now when I press a button without "Chroumium.LoadUrl" it doesn't over

Dim DevToolsContext = Await cwbBrowser.GetDevToolsContextAsync()
Dim Element = Await DevToolsContext.QuerySelectorAllAsync("input")
to access the website.

If I send a MsgBox after (Dim Element = Await DevToolsContext.QuerySelectorAllAsync("input")) this is no longer executed, i.e. it aborts the function without an error

Do you have any idea?

[amaitland]

Now when I press a button without "Chroumium.LoadUrl" it doesn't over

What do you mean by this? What's your working code look like.

Please provide a detailed example. Insufficient information for me to speculate.

[amaitland]

Then I can roughly know when to expect an answer

I will attempt to respond to GitHub monthly sponsors within 24hrs. I will respond to other queries when time permits, paid work takes priority.

When I reload the DevtoolsContext it doesn't work like before again

What is reloading the DevToolsContext exactly?

JavaScript function is triggered that outputs a text like "Wrong username..." is that also processed internally?

It's not clear what you mean by this.

I will adapt the minimal example tomorrow

It's unlikely I will have time to look at your example this week. Maybe early next week.

[Mephisto090]

I will attempt to respond to GitHub monthly sponsors within 24hrs. I will respond to other queries when time permits, paid work takes priority.

I think I'll buy you 2 coffees again for your great support.
Sorry for my bad English (i need the google translate) :(

What is reloading the DevToolsContext exactly?

• I use the DevToolsContext and describe the input fields and press a button.
• After that, the page reloads
• After that I use the DevToolsContext again (with this: DevtoolsContext = Await ChromWebBrowser.GetDevToolsContextAsync()) and get nothing back

I have the suspicion because you wrote that the script internally notices that the page is reloading and that is not passed to DevToolsContext

It's not clear what you mean by this.

When I log into a site and enter a wrong password, the site often doesn't reload but just writes "Wrong password or username"

Does the script also get this internally? As I said, the page is not reloaded in the classic sense

[amaitland]

• I use the DevToolsContext and describe the input fields and press a button.

As per my recommendation above you should create a single DevToolsContext per ChromiumWebBrowser instance, not one per button click. If you need to for some reason create them in sequence then you will need to Dispose of the previous instance.

• After that, the page reloads

It's hard to test as you haven't provided an actual working example. There are currently 501 passing unit tests that were ported from puppeteer-sharp. So I'm fairly confident that most of the navigation scenarios are handled.

When I log into a site and enter a wrong password, the site often doesn't reload but just writes "Wrong password or username"

Sounds like an expected use case. Shouldn't be anything special required.

Does the script also get this internally?

Get what exactly? The source is there should you wish to review anything for yourself.

I've simplified your example you can see the code at https://github.com/amaitland/Mephisto090.MinimalChrome/blob/master/MinimalChrome/Form1.vb#L41

The changes are in a single commit https://github.com/amaitland/Mephisto090.MinimalChrome/commit/8836715ee0a1bab7445efea8998ec1ad19235426 so you can review exactly was changed (you pull the changes into your branch for testing).

• I've removed all the unnecessary classes (which I've been repeatedly asking you to do) so the code example is clean and easy to review.
• DevToolsContext is now created just one on form load and disposed when the form is disposed (code for dispose is in the designer)
• Changed to use querySelector as per my previous recommendation.

I very much dislike VB.Net and I don't speak German so debugging/refactoring took way longer than it would have normally (reason I asked many many times for you to simplify your code).

[Mephisto090]

Can you tell me where the difference between # and . is?

Await _devtoolsContext.QuerySelectorAsync("#login")
Await _devtoolsContext.QuerySelectorAsync("div .header-login-button")

[amaitland]

This is standard query selector syntax see https://developer.mozilla.org/en-US/docs/Web/API/Document_object_model/Locating_DOM_elements_using_selectors

Some basic examples see https://developer.mozilla.org/en-US/docs/Web/API/Document_object_model/Locating_DOM_elements_using_selectors#examples (This should answer your question).