如何将 VB.net 代码中定义的字符串变量的值传递到 CefSharp 浏览器中，并使用 Javascript 按名称调用它们？

Question

First time user of CefSharp. I'm trying to use it with vb.net to automate some tasks in a website.

I created a ChromiumWebBrowser and pointed it to a website with 2 input fields Username and Password. I managed to use javascript for filling the 2 input fileds with the 2 corresponding strings as follows:

document.getElementsByTagName('input')[0].value = 'MyUsername';
document.getElementsByTagName('input')[1].value = 'MyPassword';

and IT WORKS. I'm seeing the 2 fileds filled with the 2 strings. (The fileds have no Id. That's why the getElementsByTagName)

Now, I want, instead of the actual strings inside the javascript code, to pass the strings from variables inside my VB.net code. Something like:

VB.net code

Dim USER as String = 'MyUsername'
Dim PASS as String = 'MyPassword'

and the previous JS code to something like:

document.getElementsByTagName('input')[0].value = USER;
document.getElementsByTagName('input')[1].value = PASS;

but obviously not that!

I found some posts about putting in my VB code something like this

browser.JavascriptObjectRepository.Register("boundAsync", New BoundObject())

and a Public Class BoundObject

and pass it to JS code like

await CefSharp.BindObjectAsync("boundAsync", "bound");

but I'm confused on how to do it with the 2 strings I mentioned before. How can I register the USER and PASS variables in VB.net and then call their values in JS to fill the input fields?

TIA

Answer 1

Yes I was doing that, just now!

in VB.net code

Dim USER as String = 'MyUsername'

and in JS code

document.getElementsByTagName('input')[0].value = '" + USER + "';

the trick is in the quotes. Instead of writing = USER you put it like this '" + USER + "'