How to pass a value from foreach loop in the view to the controller in ASP.NET Core MVC? - asp.net-core-mvc

Question

I have a table in my view that its rows are filled by a foreach loop. A part of this table is as follows:
#foreach (var item in Model.PmModel)
{
<td>#Html.DisplayName(item.pmNumber.ToString())</td>
<td>
<button type="button" class="btn btn-info btn-table btn-modal">Upload</button>
</td>
}
I have a button in each rows and by pressing each of them, a modal form is appeared to upload a file. I use the following code to upload the file and fill database columns based on the file information. But I need to take pmId from view to the following action:
public async Task<IActionResult> UploadFile(IFormFile file)
{
if (file != null)
{
if (file.Length > 0)
{
var fileName = Path.GetFileName(file.FileName);
var fileExtension = Path.GetExtension(fileName);
var newFileName = string.Concat(Convert.ToString(Guid.NewGuid()), fileExtension);
var path = Path.Combine(Directory.GetCurrentDirectory(), "wwwroot/PmFiles/UploadedByUsers", newFileName);
using (var stream = new FileStream(path, FileMode.Create))
{
await file.CopyToAsync(stream);
}
var fileElements = new Models.FileRepository()
{
fileId = 0,
fileName = newFileName,
isDownloaded = false,
pm = _pmRepository.GetPmById(int Id), //I need to get Id from view
uploadDate = DateTime.Now,
};
_fileRepository.InsertFile(fileElements);
_fileRepository.SaveChanges();
}
}
return RedirectToAction("PmPage");
}
I use Bootstrap modal:
#section Modal{
<div class="modal fade" id="exampleModal" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true"
dir="ltr">
<div class="modal-dialog">
<form method="post" enctype="multipart/form-data" asp-controller="Page" asp-action="UploadFile">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">File Upload</h5>
<button type="button" class="btn-close" data-mdb-dismiss="modal" aria-label="Close"></button>
</div>
<div class="modal-body">
<div class="row mt-2" dir="rtl">
<label class="form-label" for="customFile">Select your file:</label>
<input type="file" name="file" class="form-control" id="customFile" />
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-primary" data-mdb-dismiss="modal">Cancel</button>
<button type="submit" class="btn btn-danger">Upload</button>
</div>
</div>
</form>
</div>
</div>
}
In view, I can find pmId using item.pmNumber but I don't know how I can take its value to my controller. Please help me.
Update: This script triggers the modal by pressing the button.
<script type="text/javascript">
$(document).ready(function () {
$('.btn-modal').click(function () {
$('#exampleModal').modal('show');
});
});
</script>

Answer 1

You can add a hidden input in your modal and put the modal body in the foreach section to pass the item.pmNumber to hidden input.
Here is a working demo you could follow:
Model:
public class FileModel
{
public List<PmModel> PmModel { get; set; }
}
public class PmModel
{
public int pmNumber { get; set; }
}
View:
#model FileModel
#{
int i = 0; //add this....
}
#foreach (var item in Model.PmModel)
{
<td>#Html.DisplayName(item.pmNumber.ToString())</td>
<td> //change here....
<button type="button" data-toggle="modal" data-target="#exampleModal_#i" class="btn btn-info btn-table btn-modal">Upload</button>
</td> //change here.....
<div class="modal fade" id="exampleModal_#i" tabindex="-1" aria-labelledby="exampleModalLabel" aria-hidden="true"
dir="ltr">
<div class="modal-dialog">
<form method="post" enctype="multipart/form-data" asp-controller="Page" asp-action="UploadFile">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="exampleModalLabel">File Upload</h5>
<button type="button" class="btn-close" data-mdb-dismiss="modal" aria-label="Close"></button>
</div>
<div class="modal-body">
<div class="row mt-2" dir="rtl">
<!--add this-->
<input hidden name="id" value="#item.pmNumber" />
</div>
<div class="row mt-2" dir="rtl">
<label class="form-label" for="customFile">Select your file:</label>
<input type="file" name="file" class="form-control" id="customFile" />
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-primary" data-mdb-dismiss="modal">Cancel</button>
<button type="submit" class="btn btn-danger">Upload</button>
</div>
</div>
</form>
</div>
</div>
i++; //add here.........
}
#section Scripts {
<!-- Font Awesome -->
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.8.2/css/all.css">
<!-- Google Fonts -->
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700&display=swap">
<!-- Bootstrap core CSS -->
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.min.css" rel="stylesheet">
<!-- Material Design Bootstrap -->
<link href="https://cdnjs.cloudflare.com/ajax/libs/mdbootstrap/4.19.1/css/mdb.min.css" rel="stylesheet">
<!-- JQuery -->
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<!-- Bootstrap tooltips -->
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.4/umd/popper.min.js"></script>
<!-- Bootstrap core JavaScript -->
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.0/js/bootstrap.min.js"></script>
<!-- MDB core JavaScript -->
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mdbootstrap/4.19.1/js/mdb.min.js"></script>
}
Controller:
public class PageController : Controller
{
public async Task<IActionResult> UploadFile(IFormFile file,int id)
{
//do your stuff...
return View();
}
}
Besides, you can also create a partial view for modal(This partial view still needs a hidden input) to avoid looping modal body code. Refer to this answer