How to update specific row using modal Laravel 5.8 - laravel

Question

I am trying to update a specific row using modal. However I don't have any idea how to pass the value of the row id to the route parameter.
Here's the update form.
<form action="{{route('subcategory.update', 'idhere')}}" method="POST">
#method('PATCH')
#csrf
<div class="modal-body">
<label for="editname">New sub-category name:</label>
<input type="text" name="editname" id="editname" class="form-control">
<input type="text" name="editid" id="editid" value="" hidden>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<button class="btn btn-primary" type="submit">Save changes</button>
</div>
</form>
Edit button
<button class="btn btn-secondary btn-sm" data-myid="{{$item->id}}"
data-mytitle ="{{$item->name}}"
data-target="#editsub" data-toggle="modal">Edit</button>
And here's the controller
public function update(Request $request, Subcategory $subcategory)
{
// return $request;
Subcategory::where('id',$request->editid)->update([
'name' => $request->editname
]);
return back();
}

Answer 1

When you pass an id here and if your model name is subcategory.php you will get the db record in your controller.
<form action="{{route('subcategory.update', $subcategory )}}" method="POST">
Or you can do following too
<form action="{{route('subcategory.update', $subcategory->id )}}" method="POST">
Your route should have {subcategory} in it for eager loading. After that you can do following in your code.
public function update(Request $request, Subcategory $subcategory)
{
//variable $subcategory has the db record
$subcategory->update(['name' => $request->only('editname')]);
return back();
}

Answer 2

If I understand it correctly, you can store the item id in
<input type="text" name="editid" id="editid" value="{$item->id}" hidden>
And since you are using POST request, you can easily get the item id from the request.
Like the one in your post:
$request->input('editid');

Answer 3

Please try first to pass id in input box hidden field