Web Development MVC Questions

Dev Zone Code
1

Hi guys when I use standard java script this works but when I use jQery it causes problems. For example it does not change the txt and it does not change the color based on where my mouse is.

(function startup() {

    //document.getElementById("testID").innerHTML = "Shane Drafahl";
    var element = $("#testID");
    element.text("Shanel");
    var main = document.getElementById("main");

    main.onmouseenter = function () {
        main.style.backgroundColor = "#888"
    };

    main.onmouseleave = function () {
        main.style.backgroundColor = "";
    };
})();
2

In the HTML the jQuery library must be above the your.js code.

3

I found the solution to that question but now I am trying to toggle a class but when I put the info in about the new class in my css file it doesn't transfer over when I launch chrome in dev settings.

4

What's your environment look like? Are you publishing your CSS file? Is there caching?

5

ok dumb mistake, I was just entering localhost:5000 to refresh it instead of F5.

6

Now I have a question about this exception. I am trying to mess around with MVC and I get this exception when I try to run it.

Project emptyPage (.NETCoreApp,Version=v1.0) was previously compiled. Skipping compilation.

Unhandled Exception: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.TypeLoadException: Could not load type 'Microsoft.Extensions.DependencyInjection.Extensions.ServiceCollectionExtensions' from assembly 'Microsoft.Extensions.DependencyInjection.Abstractions, Version=1.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.
   at Microsoft.Extensions.DependencyInjection.MvcCoreServiceCollectionExtensions.AddMvcCore(IServiceCollection services)
   at Microsoft.Extensions.DependencyInjection.MvcServiceCollectionExtensions.AddMvc(IServiceCollection services)
   at emptyPage.Startup.ConfigureServices(IServiceCollection services)
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Microsoft.AspNetCore.Hosting.Internal.ConfigureServicesBuilder.Invoke(Object instance, IServiceCollection exportServices)
   at Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureApplicationServices()
   at Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()
   at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build()
   at emptyPage.Program.Main(String[] args)
7

it crashes after I do 

 public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
        }