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<button type="submit">Add</button>
</form>
The asp-action tag helper can generate a URL for the form, just like
when you use it on an <a> element. In this case, the asp-action helper
gets replaced with the real path to the AddItem route you'll create:
<form action="/Todo/AddItem" method="POST">
Adding an asp- tag helper to the <form> element also adds a hidden
field to the form containing a verification token. This verification token
can be used to prevent cross-site request forgery (CSRF) attacks. You'll
verify the token when you write the action.
That takes care of creating the partial view. Now, reference it from the
main Todo view:
Views/Todo/Index.cshtml
<div class="panel-footer add-item-form">
@await Html.PartialAsync("AddItemPartial", new TodoItem())
</div>
Add an action
When a user clicks Add on the form you just created, their browser will
construct a POST request to /Todo/AddItem on your application. That
won't work right now, because there isn't any action that can handle the
/Todo/AddItem route. If you try it now, ASP.NET Core will return a 404
Not Found error.
63
Add new to-do items
You'll need to create a new action called AddItem on the
TodoController :
[ValidateAntiForgeryToken]
public async Task<IActionResult> AddItem(TodoItem newItem)
{
if (!ModelState.IsValid)
{
return RedirectToAction("Index");
}
var successful = await _todoItemService.AddItemAsync(newItem);
if (!successful)
{
return BadRequest("Could not add item.");
}
return RedirectToAction("Index");
}
Notice how the new AddItem action accepts a TodoItem parameter?
This is the same TodoItem model you created in the MVC basics chapter
to store information about a to-do item. When it's used here as an action
parameter, ASP.NET Core will automatically perform a process called
model binding.
Model binding looks at the data in a request and tries to intelligently
match the incoming fields with properties on the model. In other words,
when the user submits this form and their browser POSTs to this action,
ASP.NET Core will grab the information from the form and place it in the
newItem variable.