CODEWITHSUNDEEP
c#asp.net-mvclistboxselectlist
Grizzly
Grizzly

Reputation: 5943

Select all items in listbox on page load

In my MVC application, I am retrieving a list of objects based on an ID and stuffing those objects into a Listbox via a SelectList. Here is what I have:

C#

ViewBag.SpecCatListBox = new SelectList(SelectListMethods.LstChosenSpecCat(incidentVm.ID), "Value", "Text");

HTML/Razor

@Html.ListBoxFor(model => model.LstSpecialCategories, (SelectList)ViewBag.SpecCatListBox, new { id = "SpecialCat-ListBox", @class = "form-control" })

On page load, the listbox is filled with the correct options, except that they're not selected. Is there a way to do this without looping (which is what I've seen in other posts)?

Any help is appreciated.

UPDATE

I've edited a few things, along with added a line of code.

C#

ViewBag.SpecCatListBox = new SelectList(SelectListMethods.LstChosenSpecCat(incidentVm.ID), "Value", "Text", SelectListMethods.LstChosenSpecCat(incidentVm.ID));
ViewBag.SpecCatIds = db.TBL_AssocIncidentSpecialCat.Where(x => x.IncidentId == incidentVm.ID)
    .Select(x => x.SpecialCategoriesId).ToList();

HTML/Razor

@Html.ListBoxFor(model => model.LstSpecialCategories, new MultiSelectList(ViewBag.SpecCatListBox, "Value", "Text", ViewBag.SpecCatIds), new { id = "SpecialCat-ListBox", @class = "form-control" })

This is selecting all of the options as needed, but is there a way to not use 2 Viewbag objects?

Upvotes: 0

Views: 433

Answers (1)

Grizzly
Grizzly

Reputation: 5943

I have figured this out.

C#

ViewBag.SpecCatListBox = new MultiSelectList(SelectListMethods.LstChosenSpecCat(incidentVm.ID), "Value", "Text", SelectListMethods.LstChosenSpecCat(incidentVm.ID).Select(x => x.Value));

HTML/Razor

@Html.ListBoxFor(model => model.LstSpecialCategories, (MultiSelectList)ViewBag.SpecCatListBox, new { id = "SpecialCat-ListBox", @class = "form-control" })

Upvotes: 1

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