Proper way to set select list value in an array?

Question

Most examples I've seen of how to use DropDownListFor show a model with an IEnumerable or List of SelectListItem's, and you can set the Selected property for the item you want to be initially displayed.

What is the (or a) proper way to do this for an array of dropdowns? I suppose I could make an IEnumerable<IEnumerable<SelectList>> so each dropdown has it's on IEnumerable<SelectList>> with the appropriate value selected but that just doesn't seem right.

I think it would have made a lot of sense for the DropDownListFor method to have an overload letting you set a default value. The best solution I can think of at the moment is to simply set the default value for the proper item (and clear the selected value for all others) just before calling DropDownListFor.

But surely there is a more appropriate way to do it? Or perhaps DropDownListFor just isn't appropriate for this job and straight html would be easier?

Serge · Accepted Answer · 2021-12-01 01:16:49Z

1

Instead of DropDownListFor I usually use

<select class="form-control" id="itemId" asp-for="@Model.ItemId" 
asp-items="@Model.Items"></select>

where Items = List< SelectListItem >. It automatically select ItemId from Value of select list and shows a proper text.

answered Dec 1, 2021 at 1:16

Serge

44.4k4 gold badges26 silver badges53 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

BVernon Over a year ago

+1 because that would have been a good answer if I were using core. I've added another tag to specify that this is for framework version 4.5.2 though. I did try it but no dice. :/

BVernon · Accepted Answer · 2021-12-01 03:52:51Z

0

I ended up just adding a line of code in the view directly above the DropDownListFor statement to change the selected item like so:

Model.ExpenseCategories.ForEach(cat => cat.Selected = cat.Value == item.CategoryName);

Seems like there ought to be a better way to do it, but this was a pretty simple solution. I'll wait a bit before accepting my own answer in case anyone else has a better way to do it.

answered Dec 1, 2021 at 3:52

BVernon

3,9577 gold badges37 silver badges80 bronze badges

Collectives™ on Stack Overflow

Proper way to set select list value in an array?

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related