Why is model data passed from view to controller null? - razor

Question

I have a view where I loop through the model list and display data. I am trying to pass that model to a different controller/action on link click. The data being passed is null. How do I do this?
View:
#Model TransactionViewModel
<table class="table table-striped table-hover visible-lg visible-md visible-sm " style="white-space:nowrap;">
<thead>
<tr>
<th>Date</th>
<th>Amount</th>
<th>Tag Number</th>
<th>Payment Method</th>
<th>Prior Balance</th>
<th>Current Balance</th>
<th>Description</th>
<th>Comments</th>
<th>Receipt</th>
</tr>
</thead>
<tbody>
#if (Model != null && Model.Transactions != null)
{
#foreach (var Tran in #Model.Transactions)
{
<tr>
<td>#Tran.TimeStamp</td>
<td>#Tran.Fare</td>
<td>#Tran.FullTagNum</td>
<td>#Tran.PaymentMethod</td>
<td>#Tran.PreviousBalance</td>
<td>#Tran.NewBalance</td>
<td>#Tran.PaymentDescription</td>
<td>#Tran.Comments</td>
#if (Tran.Processing_ref_string != null)
{
<td>
Receipt
</td> /*how do I pass in the dynamic variable Tran*/
}
else
{
<td>Not Available</td>
}
</tr>
}
}
</tbody>
</table>
Controller Action:
public async Task<IActionResult> PrintReceipt(ReplenishmentRecordResponse ReceiptData){
//data manipulation
}
Model:
public class TransactionViewModel
{
[Display(Name = "From", Prompt = "Starting Date")]
public DateTime StartDate { get; set; }
[Display(Name = "To", Prompt = "Ending Date")]
public DateTime EndDate { get; set; }
public List<ReplenishmentRecordResponse> Transactions { get; set; }
}

Answer 1

I would utilize asp-route-id and asp-page-handler TagHelpers to route your ID back to your PrintReceipt() method.
You could have a button like:
<button id="btnDownload" class="btn btn-info" asp-route-id="#HttpContext.Request.Query["id"]" asp-page-handler="PrintReceipt" type="submit">Submit</button>
Your element needs to have name=id for this to work, but you can change id to be anything.
Simply pass in string id as your parameter in your Controller method.
public async Task<IActionResult> PrintReceipt(string id){
//do something
}
You may need to add #Tran.Tran.Processing_ref_string in your if block
Below are some good links that could also steer you in the right direction. I hope this helps!
https://learn.microsoft.com/en-us/aspnet/core/mvc/views/tag-helpers/built-in/anchor-tag-helper?view=aspnetcore-3.1
TagHelper for passing route values as part of a link
https://www.learnrazorpages.com/razor-pages/tag-helpers/anchor-tag-helper