bookit | This is a Next | Frontend Framework library

I am trying to go from one screen to the next in my react-native application but nothing is happening when the button is selected. I am using a Stack Navigation and from all other research I have done it seems as though my pages are setup correctly please let me know if you see any problems.

Root Stack

Another beginner's question. I've captured a value from a dropdown using a JavaScript function and am trying to use it on my page. However, my return value (LocationID) is the wrong data type and the code won't compile. (When I tried the "if" line below as if (pc.LocationID = Model.BookingSL.SelectedValue) I got a message to that effect. I've tried to do a typecast to put the number into a string but nothing seems to work.

The following gives "The name 'LocSelected' does not exist in the current context", whether or not I prefix LocSelected with an @. I don't understand what's happening with the variable scope, as everything I've read tells me that a public property should be available elsewhere on my page/page model.

Have I missed something obvious again? How can I compare the value from my selectlist with a field value from my other current table entity (PCList)? (Is Selectlist.SelectedValue even the correct property of a SelectList to get the single selected value?)

In Home.cshtml.cs

As you'll gather, I'm a relative beginner to web programming - moving on from Web Forms (ASPX) written in VB. My starter project is being developed in Visual Studio Code (latest version) as Razor pages using .Net Core 3.1 as I gathered that's now the most straightforward way. (I've avoided the full Visual Studio as this is a small project, I can't ask my organisation to pay for it and Microsoft is clear that the Community version isn't for use in "Enterprises", as it defines us.) I have coded in Basic, Pascal and Perl but am not an instinctive programmer. The complexity of a web application seems to me to have increased tenfold since "Classic ASP" and the requirement now to separate elements into View, Model and ViewModel.

Following examples on line, I've got my app to write to (seed data) and read from a MySQL database. However, parts of the View have defeated me. I've tried various examples of how to create and populate a dropdown list but none will compile or run for me because of missing elements, even after running "dotnet add package" and adding a reference to the relevant namespace.

Although my application is to run on Windows only, I decided I don't want a combo box because it's resource hungry (my application wouldn't compile anyway even after adding the necessary references and trying to rebuild.) I got in a tangle with tag helpers and HTML helpers and had a series of different errors. I haven't tried examples including "Viewbag" because I couldn't find a clear description of what it is, and at least one source advised against using it anyway.

It then struck me that I was overcomplicating things because my application had successfully read the data needed in the dropdown, as the attached image shows. It's there in the model (Home.cshtlml.cs) using BookIt_Context.cs and entities representing the two tables here in PC.cs and Location.cs. As the image shows, my sample data is available and can be shown in a table (for PC) and as plain text for Location (the list of place names run together at the top). However, trying various other techniques to show the dropdown kept giving errors telling me "Name" was not in the Model (although it clearly is).

Now the compile errors have gone but the dropdown for Location remains stubbornly blank. Can anyone tell me why? Does the data in Location (public List Location {get; set; } = new List(); ) need some kind of typecast to be shown in a dropdown? Apologies if I've missed something simple but I just can't see it.Screen shot

I have this data-request from Mailchimp plugin where I send form data to Mailchimp API.