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programming_books_eng

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This code first uses jQuery (a JavaScript helper library) to attach some
code to the click even of all the checkboxes on the page with the CSS
class done-checkbox . When a checkbox is clicked, the markCompleted()
function is run.
The markCompleted() function does a few things:
70
Complete items with a checkbox
Adds the disabled attribute to the checkbox so it can't be clicked
again
Adds the done CSS class to the parent row that contains the
checkbox, which changes the way the row looks based on the CSS
rules in style.css
Submits the form
That takes care of the view and frontend code. Now it's time to add a
new action!
Add an action to the controller
As you've probably guessed, you need to add an action called MarkDone
in the TodoController :
[ValidateAntiForgeryToken]
public async Task<IActionResult> MarkDone(Guid id)
{
if (id == Guid.Empty)
{
return RedirectToAction("Index");
}
var successful = await _todoItemService.MarkDoneAsync(id);
if (!successful)
{
return BadRequest("Could not mark item as done.");
}
return RedirectToAction("Index");
}
Let's step through each line of this action method. First, the method
accepts a Guid parameter called id in the method signature. Unlike
the AddItem action, which used a model and model binding/validation,
the id parameter is very simple. If the incoming request data includes a
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Complete items with a checkbox
field called id , ASP.NET Core will try to parse it as a guid. This works
because the hidden element you added to the checkbox form is named
id .
Since you aren't using model binding, there's no ModelState to check for
validity. Instead, you can check the guid value directly to make sure it's
valid. If for some reason the id parameter in the request was missing or
couldn't be parsed as a guid, id will have a value of Guid.Empty . If
that's the case, the action tells the browser to redirect to /Todo/Index
and refresh the page.
Next, the controller needs to call the service layer to update the
database. This will be handled by a new method called MarkDoneAsync