Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

MVC client-side validation With multiple models

Posted on 2014-02-10
4
135 Views
Last Modified: 2016-06-20
I have three models: VehicleType, VehicleModel, and VehicleManufacturer.

Both VehicleType and VehicleManufacturer point to VehicleModel in the model, like so:

namespace Dealership.Models
{
    public class VehicleModel
    {
        [Key]
        public int ModelId { get; set; }
        public int TypeId { get; set; }
        public int ManufacturerId { get; set; }
        public string ModelName { get; set; }

       
        public VehicleType VehicleType { get; set; }
        public VehicleManufacturer Manufacturer { get; set; }

    }
}

Open in new window


From there, VehicleModel points to the InventoryModel:

public class Inventory
    {
        [Key]
        public int InventoryId { get; set; }
        public int Price { get; set; }
        public int Mileage { get; set; }
        public int Year { get; set; }


        public int ModelId { get; set; }
        public VehicleModel VehicleModel { get; set; }
    }

Open in new window


My problem is when I try to get client-side validation working on all three dropdownlists (VehicleType, VehicleManufacturer, VehicleModel), it only works with VehicleModel. I believe this is because in the View, I am calling the Inventory Model(@model IEnumerable<Dealership.Models.Inventory>), and VehicleModel has a navigation property pointing to the Inventory model. But VehicleManufacturer and VehicleType point to the VehicleModel, so I don't see why all three models can't be validated.
What needs to be done to validate these two dropdownlists using these models?

Here is my controller (fyi)
// GET: /Inventory/Create
        public ActionResult Create()
        {
            ViewBag.TypeId = new SelectList(db.Types, "TypeId", "TypeName"); //(Object List, Value Field (usually Id), Column)
            ViewBag.ModelId = new SelectList(db.Models, "ModelId", "ModelName"); //(Object List, Value Field (usually Id), Column)
            ViewBag.ManufacturerId = new SelectList(db.Manufacturers, "ManufacturerId", "ManufacturerName"); //(Object List, Value Field (usually Id), Column)

            return View();
        }

        // POST: /Inventory/Create
        // To protect from overposting attacks, please enable the specific properties you want to bind to, for 
        // more details see http://go.microsoft.com/fwlink/?LinkId=317598.
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create(Inventory inventory, VehicleManufacturer VehicleManufacturer, VehicleType VehicleType)
        {
            if (ModelState.IsValid)
            {
                db.Inventorys.Add(inventory);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            ViewBag.TypeId = new SelectList(db.Types, "TypeId", "TypeName");
            ViewBag.ModelId = new SelectList(db.Models, "ModelId", "ModelName");
            ViewBag.ManufacturerId = new SelectList(db.Manufacturers, "ManufacturerId", "ManufacturerName");

            return View(inventory);
        }

Open in new window



And my View:



<div class="editor-label">
            @Html.LabelFor(model => model.VehicleModel.TypeId, "Some name for column")
        </div>
        <div class="editor-field">
            @Html.DropDownList("TypeId", String.Empty)

            @Html.ValidationMessageFor(model => model.VehicleModel.TypeId)
        </div>


        <div class="editor-label">
            @Html.LabelFor(model => model.ModelId, "Some name for column")
        </div>
        <div class="editor-field">
            @Html.DropDownList("ModelId", String.Empty)
            @Html.ValidationMessageFor(model => model.ModelId)
        </div>



        <div class="editor-label">
            @Html.LabelFor(model => model.VehicleModel.ManufacturerId, "Some name for column")
        </div>
        <div class="editor-field">
            @Html.DropDownList("ManufacturerId", String.Empty)
            @Html.ValidationMessageFor(model => model.VehicleModel.ManufacturerId)
        </div>

Open in new window



Thanks in advance!
0
Comment
Question by:DonHoddinott2
  • 2
4 Comments
 
LVL 11

Expert Comment

by:Mihai Stancescu
ID: 39849352
Hi,

Try decorating the properties with [Required] attribute. You can also implement in your model the interface "IValidatableObject" to provice custom validation.


Regards,
Mishu
0
 

Author Comment

by:DonHoddinott2
ID: 39856777
Hi Mishu,

I appreciate your answer, but I don't it is necessary to use IValidateObject in this instance. I want to understand why it isn't working, just as much as I want it resolved. Adding the [Required] attribute didn't work.
0
 
LVL 11

Accepted Solution

by:
Mihai Stancescu earned 500 total points
ID: 39858414
Hi again,

As I see it you have two options for achieving this:
1. In your form add or modify this line @Html.ValidationSummary(false) and call the method using false as parameter.
2. In your view change the dropdown definition from @Html.DropDownList("ModelId", String.Empty) to  @Html.DropDownListFor(model=>model.VehicleModel.TypeId,  (SelectList)ViewBag.ModelId,"-please select item-").

The first option will display all the validation messages where that line is placed.
The second option will add the in-line client side validation that you need.

Hope this helps,
Mishu
0

Featured Post

DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Calculating holidays and working days is a function that is often needed yet it is not one found within the Framework. This article presents one approach to building a working-day calculator for use in .NET.
This article aims to explain the working of CircularLogArchiver. This tool was designed to solve the buildup of log file in cases where systems do not support circular logging or where circular logging is not enabled
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

840 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question