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Data Validation Using Annotations for jQuery AJAX Calls in MVC Applications

, 4 Jul 2011 CPOL
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.
DataAnnotationAjax.zip
DataAnnotationAjax
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Content
Controllers
ControllerBase
DataAnnotationAjax.csproj.user
Global.asax
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obj
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Home
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using DataAnnotationAjax.Models;
using DataAnnotationAjax.Controllers.ControllerBase;

namespace DataAnnotationAjax.Controllers
{
    public class HomeController : BaseController
    {
        [HttpGet]
        public ActionResult Index()
        {
            return View(StudentRepository.GetStudent());
        }

        [HttpPost]
        public ActionResult AddStudent()
        {
            var student = new Student();

            // The TryUpdateModel will use data annotation to validate
            // the data passed over from the client. If any validation
            // fails, the error will be written to the "ModelState".
            var valid = TryUpdateModel(student);

            string studentPartialViewHtml = null;
            if (valid)
            {
                // Add the student to the repository.
                // In any pratical application, exception handling should be used
                // when making data access. In this small example, I will just cross
                // my finger to say "there is no chance to encounter exeption" when
                // adding the student. Indeed, the chance of exception is very minimal
                // when adding students to my small repositoty. If the validation is
                // successful, I will simply tell the client that the student is added.
                StudentRepository.AddStudent(student);

                // Obtain the html string from the partial view "Students.ascx"
                var students = StudentRepository.GetStudent();
                studentPartialViewHtml = RenderPartialViewToString("Students", students);
            }

            return Json(new {Valid = valid,
                             Errors = GetErrorsFromModelState(), 
                StudentsPartial = studentPartialViewHtml
            });
        }
    }
}

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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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