I'm creating a program in vb.net to go to https://www.royalmail.com/track-your-item#/ and:

1. Enter some text in the Reference Number box
2. Click the button 'Track your delivery'
3. Grab the text from the page so I can search for the delivery date

I've had to switch to using CeFSharp, as the microsoft browser doesn't want to load the page, so this is my first time with it.

This is what I have so far (CWB1 is the name of the browser object):

CWB1.LoadUrl("https://www.royalmail.com/track-your-item#")

CWB1.LoadUrl("javascript:void( document.getElementById( 'barcode-input' ).value='12345678' )")

Dim script = "var pagebutton = document.getElementById('submit');
pagebutton.click();"

CWB1.ExecuteScriptAsyncWhenPageLoaded(script)

The page loads, the text '12345678' is entered in the search box, but running the script to press the button does nothing.

I can't figure out how to press the button. I thought it must be the wrong id, but inspecting the web page seems to give button id="submit" so this should work? I've tried a few variations but nothing seems to move me forwards.

I also then need to grab the text from the page - not sure how to so this either?

Thanks for any help!