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Data Validation Using Annotations for jQuery AJAX Calls in MVC Applications

, 4 Jul 2011 CPOL 51.7K 1.5K 33
This article presents an example of how to use data annotations to validate data received from jQuery AJAX calls and how to send validation result as well as HTML content from a partial view to the client in a JSON object in MVC.
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using System.Web.Mvc;
using System.IO;
using System.Collections.Generic;

namespace DataAnnotationAjax.Controllers.ControllerBase
{
    public class BaseController : Controller
    {
        // This method helps to render a partial view into html string.
        // http://craftycodeblog.com/2010/05/15/asp-net-mvc-render-partial-view-to-string/
        // Credit: Kevin Craft
        public string RenderPartialViewToString(string viewName, object model)
        {
            ViewData.Model = model;
            using (var sw = new StringWriter())
            {
                var viewResult = ViewEngines.Engines.FindPartialView(ControllerContext, viewName);
                var viewContext = new ViewContext(ControllerContext,
                    viewResult.View, ViewData, TempData, sw);
                viewResult.View.Render(viewContext, sw);

                return sw.GetStringBuilder().ToString();
            }
        }

        // This method helps to get the error information from the MVC "ModelState".
        // We can not directly send the ModelState to the client in Json. The "ModelState"
        // object has some circular reference that prevents it to be serialized to Json.
        public Dictionary<string, object> GetErrorsFromModelState()
        {
            var errors = new Dictionary<string, object>();
            foreach (var key in ModelState.Keys)
            {
                // Only send the errors to the client.
                if (ModelState[key].Errors.Count > 0)
                {
                    errors[key] = ModelState[key].Errors;
                }
            }

            return errors;
        }
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Dr. Song Li
United States United States
I have been working in the IT industry for some time. It is still exciting and I am still learning. I am a happy and honest person, and I want to be your friend.

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