C#•12mo ago

ASP.NET MVC

How do I check that my input (html) (from the view) matches the data in the database? (For example, like matching Username and Password). While also using DataAnnotations to validate that the input = database stuff? Also would like someone to do some pair coding to help me out if they have time.

23 Replies

BlasterBlasterOP•12mo ago

[HttpPost]
public IActionResult Save(List<Question> questions)
{
    if(ModelState.IsValid)
    {
        foreach (Question question in questions)
        {
            question.Genus == *HtmlInput //i dont know the syntax of doing this, but basically some way to use the HTML input in my controller
        }
    }
            
}

[HttpPost]
public IActionResult Save(List<Question> questions)
{
    if(ModelState.IsValid)
    {
        foreach (Question question in questions)
        {
            question.Genus == *HtmlInput //i dont know the syntax of doing this, but basically some way to use the HTML input in my controller
        }
    }
            
}

Angius•12mo ago

If by "html input" you mean a form, then you can bind to the form data

[HttpPost]
public IActionResult Foo(string name)
{

}

[HttpPost]
public IActionResult Foo(string name)
{

}

<form method="post" action="some-controller">
  <input type="text" name="name" />
  <input type="submit" value="Send" />
</form>

<form method="post" action="some-controller">
  <input type="text" name="name" />
  <input type="submit" value="Send" />
</form>

BlasterBlasterOP•12mo ago

I was using a form. So, I can "bind" that parameter in the controller to my "<input>" using a tag-helper?

Angius•12mo ago

No need for tag helpers Input named name goes into parameter named name

BlasterBlasterOP•12mo ago

[HttpPost]
public IActionResult Save(List<Question> questions, string input)
{
    if(ModelState.IsValid)
    {
        foreach (Question question in questions)
        {
            if (question.Genus != input)
                ModelState.AddModelError("", question.Species + " is wrong!");
        }
    }
    return View(questions);

}

[HttpPost]
public IActionResult Save(List<Question> questions, string input)
{
    if(ModelState.IsValid)
    {
        foreach (Question question in questions)
        {
            if (question.Genus != input)
                ModelState.AddModelError("", question.Species + " is wrong!");
        }
    }
    return View(questions);

}

Updated. Still don't know if it works.

Angius•12mo ago

Well, try it? If that doesn't work, you might need [FromForm] attribute on the parameter Also, where are you getting the questions from?

BlasterBlasterOP•12mo ago

<form asp-action="Save" method="post">
    <div asp-validation-summary="All" class="text-danger"></div>

@foreach(var question in Model)
{
    <div class="form-group">
        <label>@question.Species</label>
            <input asp-controller="Game" asp-action="Save" asp-route="input" class="form-control" type="text" placeholder="@question.Species is a type of...">
    </div>
}
</form>

<form asp-action="Save" method="post">
    <div asp-validation-summary="All" class="text-danger"></div>

@foreach(var question in Model)
{
    <div class="form-group">
        <label>@question.Species</label>
            <input asp-controller="Game" asp-action="Save" asp-route="input" class="form-control" type="text" placeholder="@question.Species is a type of...">
    </div>
}
</form>

"questions" is coming from the razor model (@model List<Question>) on the top of my razor page.

BlasterBlasterOP•12mo ago

BlasterBlasterOP•12mo ago

Above. Is the example of my code running.

Angius•12mo ago

Ah, so you want a list of inputs, essentially, gotcha

BlasterBlasterOP•12mo ago

@ZZZZZZZZZZZZZZZZZZZZZZZZZ What do you think about my using of the asp tag helpers like asp-controller , asp-action, and asp-route in my input?

Angius•12mo ago

You'll have to look up how to deal with dynamic forms, then

BlasterBlasterOP•12mo ago

It's a game where you have to match the definitions basically

Angius•12mo ago

Inputs don't have any URL-like attributes, so asp-controller, asp-action, etc. are useless on them The form defines where the data is sent So the form needs that

BlasterBlasterOP•12mo ago

@model List<Question> 


<div class="text-center">
    <h1 class="display-4">Welcome</h1>

</div>
<form asp-controller="Game" asp-action="Save" method="post">
    <div asp-validation-summary="All" class="text-danger"></div>

@foreach(var question in Model)
{
    <div class="form-group">
        <label>@question.Species</label>
            <input name="input "class="form-control" type="text" placeholder="@question.Species is a type of...">
    </div>
}

</form>

@model List<Question> 


<div class="text-center">
    <h1 class="display-4">Welcome</h1>

</div>
<form asp-controller="Game" asp-action="Save" method="post">
    <div asp-validation-summary="All" class="text-danger"></div>

@foreach(var question in Model)
{
    <div class="form-group">
        <label>@question.Species</label>
            <input name="input "class="form-control" type="text" placeholder="@question.Species is a type of...">
    </div>
}

</form>

This is what I changed it to So the "name" tag helps connect the view to the controller? Esp. the parameter

Angius•12mo ago

Yes Input with [name] -> parameter with [name] But in your case, you have a dynamic list of inputs Each should have an individual name, too, since they refer to different questions

BlasterBlasterOP•12mo ago

Ah ssibal

Angius•12mo ago

So, again, you should look up how to deal with dynamic forms

BlasterBlasterOP•12mo ago

Ok I will One more thing, can I use the "Enter" button to submit my <input> or do I need to connect a button to it?

Angius•12mo ago

Might need Javascript for that

BlasterBlasterOP•12mo ago

Okay, I don't know Javascript haha so maybe just use a button Going to bump my thread to see if anyone can help me. I am still having issues with my program.

using FinalProject.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Rendering;

namespace FinalProject.Controllers
{
    public class GameController : Controller
    {
        private FinalProjectContext _context;
        public GameController(FinalProjectContext context) 
        {
            _context = context;
        }

        public IActionResult Index()
        {
            List<Question> questions = _context.Questions.ToList();
            GameViewModel gameViewModel = new GameViewModel();
            gameViewModel.Questions = questions;
            return View(gameViewModel);
        }


        [HttpPost]
        public IActionResult Save(GameViewModel gameViewModel)
        {
            
            if (ModelState.IsValid)
            {
                foreach (Question question in gameViewModel.Questions)
                {
                    //if (question.Genus != gameViewModel.UserInput)
                    //    ModelState.AddModelError("", question.Species + " is wrong!");
                    string test = "Genus is " + question.Genus + " input is " + gameViewModel.UserInput;
                    
                }
                return RedirectToAction("Index", "Home");
            }
            else
            {
                return View(gameViewModel);
            }
            

        }



    }
}

using FinalProject.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Rendering;

namespace FinalProject.Controllers
{
    public class GameController : Controller
    {
        private FinalProjectContext _context;
        public GameController(FinalProjectContext context) 
        {
            _context = context;
        }

        public IActionResult Index()
        {
            List<Question> questions = _context.Questions.ToList();
            GameViewModel gameViewModel = new GameViewModel();
            gameViewModel.Questions = questions;
            return View(gameViewModel);
        }


        [HttpPost]
        public IActionResult Save(GameViewModel gameViewModel)
        {
            
            if (ModelState.IsValid)
            {
                foreach (Question question in gameViewModel.Questions)
                {
                    //if (question.Genus != gameViewModel.UserInput)
                    //    ModelState.AddModelError("", question.Species + " is wrong!");
                    string test = "Genus is " + question.Genus + " input is " + gameViewModel.UserInput;
                    
                }
                return RedirectToAction("Index", "Home");
            }
            else
            {
                return View(gameViewModel);
            }
            

        }



    }
}

This is my controller

@model GameViewModel


<div class="text-center">
    <h1 class="display-4">Welcome</h1>

</div>
<form asp-controller="Game" asp-action="Save" method="post">
    <div asp-validation-summary="All" class="text-danger"></div>

@foreach(var question in Model.Questions)
{
    <div class="form-group">
        <label>@question.Species</label>
            <input name="GameViewModel.UserInput" class="form-control" type="text" placeholder="@question.Species is a type of...">
            <input type="hidden" name="GameViewModel.Questions.Genus" value="@question.Genus">
    </div>
}
<button type="submit">Submit</button>
</form>

@model GameViewModel


<div class="text-center">
    <h1 class="display-4">Welcome</h1>

</div>
<form asp-controller="Game" asp-action="Save" method="post">
    <div asp-validation-summary="All" class="text-danger"></div>

@foreach(var question in Model.Questions)
{
    <div class="form-group">
        <label>@question.Species</label>
            <input name="GameViewModel.UserInput" class="form-control" type="text" placeholder="@question.Species is a type of...">
            <input type="hidden" name="GameViewModel.Questions.Genus" value="@question.Genus">
    </div>
}
<button type="submit">Submit</button>
</form>

This is my view

BlasterBlasterOP•12mo ago

This is my website I don't understand how the form is submitting I am not able to transfer my data to the controller If I switch my asp-action="Save" in my view then it will crash on submitting Saying it can't find a save view One thing is that my ModelState.IsValid is returning false, and I don't know why this is. I want it to send my viewmodel to my post Ok well I've made progress But my current issue is now my data is not being passed correctly to my controller I think it is how i coded my view But this is very difficult for me I think my ViewModel is formatted wrong for what I want for my game to work aswell

Gaming

Programming

ASP.NET MVC