Update multiple select dropdown(select 2) in ASP.NET MVC

Question

I am creating a product, where i will select multiple categories from multiple select dropdown list. product information will be saved in product table

Product_Id  Name Description
1001        Abc   Abcdescription
1002        Xyz   Xyzdescription

and selected categories will be saved in another table product_cat_type by product_Id

Type_Id Product_Id  Category    
1       1001        Electronics 
2       1001        Devices     
3       1001        Gadgets

now i want to update product 1001, all data showing in their respective boxes but multiple select drop down not populating with their previously select categories.

Controller

 model.prodcategory= new SelectList(db.Product_category.ToList(), "Category_id", "Category_name");

Viewmodel

 [NotMapped]
 public int[] Category_iid { get; set; }
 public IEnumerable<SelectListItem> prodcategory{ get; set; }

View Page

@Html.DropDownListFor(model => model.Category_iid, Model.prodcategory, "Select Category", new { @class = "form-control m-select2", multiple = "multiple", id = "kt_select2_3" })

now i am trying to append from product_cat_type Product_Id column values to Category_iid

present output click here

expected output click here

Note: I am doing this by using linq code without using any ajax, jquery or json

Honestly, I would suggest creating the dropdown list in vanilla JS rather than in the HTML. Have you considered giving this approach a shot? Or is there a specific reason you need to use html? — Zach Pedigo
– Zach Pedigo, Commented Sep 24, 2019 at 19:39
@ZachPedigo, I am not that much familiar with JavaScript / Jquery or Vanilla JS, so I am using HTML and facing the issue. — Suresh
– Suresh, Commented Sep 26, 2019 at 9:51

Suresh · Accepted Answer · 2019-09-30 17:24:11Z

0

Thanks to all those people who have shown their interest in my question. while searching more about it, i got another stack overflow question, where i got answer as per my requirement.

Click here to visit the similar question.

answered Sep 30, 2019 at 17:24

Suresh

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