While creating a Html TextBox or Dropdown list using jQuery, it would define the ID and Name attributes of an Html TextBox or Dropdown list. First, let's us understand what is ID and Name attribute of Html controls. ID attribute of an input html control is responsible for uniquely identified a control on the html page. We use ID for getting an input html control's value using jQuery at client side or for applying some CSS to that control. And Name attribute of an input html control is responsible for posting that control values on server side.

When you will not defined the Name attributes of an Html TextBox or Dropdown list then form will not post the TextBox or Dropdown list values to the server. It means at controller's action result, you will not find the Html TextBox or Dropdown list. Then, you need to select no of customers from drop down list as shown below:

Also, Textboxes for entering customers full name are created by jQuery as shown below:

When you will submit the form you will get the Textboxes created by jQuery at controller side as shown below:

Here's the view code:

    <script src="~/Scripts/jquery-1.8.2.js"></script>
    <script>
    $(document).ready(function () {
    $("#ddl").change(function () {
    var i = $("#ddl :selected").val();
    var str = "";
    for (var j = 1; j <= i; j++) {
    var id = "txtCustomer" + j;
    //Remember to add name attribute to get values at server side
    str = str + "<span>Customer " + j + " Full Name: </span><input type='text' id='" + id + "' name='" + id + "'/><br/>";
    }
    $("#content").html(str);
    });
    });
    </script>
    
    <br />
    @using (Html.BeginForm())
    {
    <h2>Get TextBoxes Values Created by jQuery</h2>
    <span>Select No. of Customers </span>
    <select id="ddl" name="ddl">
    <option>Select</option>
    <option>1</option>
    <option>2</option>
    <option>3</option>
    <option>4</option>
    </select>
    <br />
    <div id="content">
    </div>
    <br />
    <div align="center">
    <input type="submit" id="btnSave" value="Save" />
    </div>
    }

And you can get the Html TextBox or Dropdown list values created by jQuery by two method: Get Values Using FormCollection and Get Values Using Request.Form.

Method 1: Get Values Using FormCollection

    public ActionResult Index()
    {
    return View();
    }
    
    [HttpPost]
    public ActionResult Index(FormCollection form, string ddl)
    {
    for (int i = 1; i <= Convert.ToInt32(ddl); i++)
    {
    string id = "txtCustomer" + i;
    string customer = form[id];
    }
    return View();
    }

Method 2: Get Values Using Request.Form

  public ActionResult Index()
    {
    return View();
    }
    
    [HttpPost]
    public ActionResult Index(string ddl)
    {
    for (int i = 1; i <= Convert.ToInt32(ddl); i++)
    {
    string id = "txtCustomer" + i;
    string customer = Request.Form[id];
    }
    return View();
    }

Hope you will enjoy this tutorial!

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This sample shows the code that is utilized to post the JSON information to the server utilizing AngularJS $http service based on AJAX POST protocol in MVC. It additionally shows the capacity of AngularJS dependency injection which is used to inject $http service to the controller as it is initiated.

The $http administration is a center Angular administration that encourages communication  with the remote HTTP servers via the browser's XMLHttpRequest object or via JSONP. The detailed article on $http service could be found on AngularJS $http page.

Pay consideration on Spring MVC controller strategy where @RequestBody is utilized. One needs to make a Domain item mapping to JSON. Additionally, simply making the space object won't do. One needs to include Jackson libraries in the classpath. Otherwise, 415 error would keep haunting.

$http Service & Related Code
Let’s write the following code to  create JSON object:
var helloAjaxApp = angular.module("helloAjaxApp", []);
helloAjaxApp.controller("CompaniesCtrl", ['$scope', '$http', function($scope, $http) {    $scope.companies = [
                                    { 'name':'Infosys Technologies',
                                                'employees': 125000,
                                                'headoffice': 'Bangalore'},
                                                { 'name':'Cognizant Technologies',
                                                  'employees': 100000,
                                                  'headoffice': 'London'},
                                                  { 'name':'Peter',
                                                  'employees': 115000,
                                                  'headoffice': 'London'},
                                                  { 'name':’IT Support',
                                                  'employees': 150000,
                                                  'headoffice': ' London '},                                                              
                                    ];        
                $scope.addRowAsyncAsJSON = function(){                                                        
$scope.companies.push({ 'name':$scope.name, 'employees': $scope.employees, 'headoffice':$scope.headoffice });
                                // Writing it to the server
                                //                           
                                var dataObj = {
                                name : $scope.name,
                                employees : $scope.employees,
                                headoffice : $scope.headoffice
                                };            
                                var res = $http.post('/savecompany_json', dataObj);
                                res.success(function(data, status, headers, config) {
                                $scope.message = data;
                                });
                                res.error(function(data, status, headers, config) {
                                alert( "failure message: " + JSON.stringify({data: data}));
                                });                          
                                // Making the fields empty
                                //
                                $scope.name='';
                                $scope.employees='';
                                $scope.headoffice='';
                };
}]);

Java Controller Code
saveCompany_JSON method which is called from $http service using POST method type.  
@RequestBody Company company that represents the fact that request is parsed using Jackson library and passed as Company object.                                   
@RequestMapping(value = "/angularjs-http-service-ajax-post-json-data-code-example", method = RequestMethod.GET)
public ModelAndView httpServicePostJSONDataExample( ModelMap model ) {
                return new ModelAndView("httpservice_post_json");
} @RequestMapping(value = "/savecompany_json", method = RequestMethod.POST)  
public  @ResponseBody String saveCompany_JSON( @RequestBody Company company )   {                                  
//
// Code processing the input parameters
//           
return "JSON: The company name: " + company.getName() + ", Employees count: " + company.getEmployees() + ", Headoffice: " + company.getHeadoffice();
}                                                                                             
Java Code for Company Object (Domain object)
package com.vitalflux.core;
public class Company {  
                private String name;
                private long employees;
                private String headoffice;
                public String getName() {
                                return name;
                }
                public void setName(String name) {
                                this.name = name;
                }
                public Long getEmployees() {
                                return employees;
                }
                public void setEmployees(Long employees) {
                                this.employees = employees;
                }
                public String getHeadoffice() {
                return headoffice;
                }
                public void setHeadoffice(String headoffice) {
                                this.headoffice = headoffice;
                }
}                                                                                         

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Today, I will tell you about how to search records in MVC with Ajax and jQuery. This code will filter out all matching records group by table column name.

First thing that you should do is create an empty ASP.NET MVC project. Now, add two class to your model. Employee and DemoContext and write the following code:
namespace SearchingDemo.Models
{
    public class Employee
    {
        [Key]
        public int Id { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Position { get; set; }
     }
}
namespace SearchingDemo.Models
{
    public class DemoContext : DbContext
    {
        public DbSet<Employee> Employees { get; set; }
    }
}

Add a Home Controller. Now, Add index Action to controller. and create corresponding view.
public ActionResult Index()
       {
           return View();
      }

Now, write the following code to Index View.
<link href="~/Content/Style.css" rel="stylesheet" />
<script src="~/Content/jquery-2.1.1.min.js"></script>
<script src="~/Content/CustomJs.js"></script>
<h2>Seaching Demo</h2> 
<div class="divFind">
    <table>
        <tr>
            <td>
                <input type="text" id="txtSearch" />
            </td>
            <td>
                <input type="button" id="btnSearch" value="Seach" />
            </td>
        </tr>
    </table>
</div>
<div id="divList"> 
</div>

Write the .JS code for click event on seach button to get filtered result. add following .JS code.
$(document).ready(function () {
    $('#btnSearch').on('click', function () {
        var getkey = $('#txtSearch').val();
        $.ajax({           
        type: 'POST',
            contentType: 'application/json; charset=utf-8',
            url: 'Home/Search',
            data: "{ 'searchKey':' " + getkey + "' }",
            success: function (data) {
                BindData(data);
            },            
            error: function (data) {
                alert('Error in getting result');
            }
        });
   });
}); 
function BindData(data) {
    var ulList = '<ul>';
    var resultType = ["FirstName", "LastName", "Position"];
    $.each(data, function (i, d) {
        ulList += '<li class="SeachType">' + resultType[i] + '</li>';
        if (d.length > 0) {
            $.each(d, function (key, value) {
                ulList += '<li>' + value.FirstName + ' - ' + value.LastName + ' - ' + value.Position + '</li>'
            });
        } else {            
        ulList += '<li><span class="red">No Results</span></li>';
        }
    });
    ulList += '</ul>'
    $('#divList').html(ulList);
}

Javascript code calling search function, which is written in controller. Add search function to your controller.
public JsonResult Search(string searchKey)
       {
           DemoContext dbObj = new DemoContext();
           var getKey = searchKey.Trim();
           var getFirstName = dbObj.Employees.Where(n => n.FirstName.Contains(getKey)).ToList(); 
           var getLastName = dbObj.Employees.Where(n => n.LastName.Contains(getKey)).ToList(); 
           var getPostion = dbObj.Employees.Where(n => n.Position.Contains(getKey)).ToList(); 
           IList<IList<Employee>> getTotal = new List<IList<Employee>>();
           getTotal.Add(getFirstName);
           getTotal.Add(getLastName);
           getTotal.Add(getPostion);
           int count = getTotal.Count();
           return Json(getTotal);
      }

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In this case we disclose that how to show Empty Data Text in webgrid in MVC with ASP.NET.

There is no facility in webgrid to show empty datatext automatically, so we need to manually write or characterize the code for this.

Let's see a simple tips that demonstrates to show Empty Data or unfilled information message in ASP.NET MVC WebGrid by utilizing WebGrid web helper class. Here in this post we will check the  model in the event that it  has no data then show a message, like the EmptyDataText property of the ASP.NET GridView.

To utilize the WebGrid web assistant as a part of MVC application, you need to first make an article reference to the WebGrid class and utilize the GetHtml() method that renders the grid. To use the WebGrid web helper in mvc application, you have to first create an object reference to the WebGrid class and use the GetHtml() method that renders the grid.
@{
                Var grid=new WebGrid(Model);
@grid.GetHtml();
}
To Display an Empty Data Text in Webgrid when the Model has no data or no record, just you have to write  following one:
@if(Model.Count>0)
@{
Var grid=new WebGrid(Model);
@grid.GetHtml();
}
Else
<p>No Record Found</p>
}

I hope this tutorial works for you!

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In this post, I will tell you about Refresh PartialView Automatically in ASP.NET MVC 6.  First thing you can do is Create a MVC app on Visual Studio and then add two Classes to your model folder.

using System.ComponentModel.DataAnnotations;
namespace AutoRefresh.Models
{
    public class Employee
    {
        [Key]
        public int Id { get; set; }
        public string Name { get; set; }
        public string ImagePath { get; set; }
    }
}

using System.Data.Entity;
namespace AutoRefresh.Models
{
    public class DemoContext:DbContext
    {
        public DbSet<Employee> employee { get; set; }
    }
}

Now, add a Home Controller and write the following code:
using System;
using System.Linq;
using System.Web.Mvc;
using AutoRefresh.Models;
using System.Web.UI;
namespace AutoRefresh.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            using (DemoContext dbObj = new DemoContext())
            {
               var empList = dbObj.employee.ToList();
                return View(empList);
           }
    }
        [OutputCache(Location = OutputCacheLocation.Client, VaryByParam = "none", Duration = 2)]
        public PartialViewResult _employeeShow()
       {
            using (DemoContext dbObj = new DemoContext())
            {
                var empList = dbObj.employee.ToList();
                int MinId = empList.Min(a => a.Id);
                int MaxId = empList.Max(a => a.Id);
               //generate a random number
                int GetRandomId = new Random().Next(MinId, (MaxId + 1));
                var getRandomemployee=empList.Find(a => a.Id == GetRandomId);
                return PartialView("_employeeShow", getRandomemployee);
            }
        }
     }
}

From the above code, I used OutputCache to get Data from Cache. Next step, add a PartialView _employeeShow to show the Employee.
@model AutoRefresh.Models.Employee
<div class="divEmployee" style="margin-left: 50px;">
    <img src="@Model.ImagePath" width="100" height="100" />
    <span>@Model.Name</span>
</div>

Now , create the Index View. With this view we will load our PartialView.
@model IEnumerable<AutoRefresh.Models.Employee>
@{
    ViewBag.Title = "Index";
}
<script src="~/Scripts/jquery-2.1.1.min.js"></script>
<script type="text/javascript">
    $(document).ready(function () {
        setInterval(function () {
            $('#Employee').load('/Home/_employeeShow')
        },2000);
    });
</script>
<h2>Employee</h2>
<div id="Employee">
    @Html.Partial("_employeeShow", Model.FirstOrDefault())
</div>

Using Jquery, I’m loading the PartialView in every 2 seconds.

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The Bind attribute is used to protect against over-posting. Represents an attribute that is used to provide details about how model binding to a parameter should occur.

Let’s take an example of Employee Controller which creates the records for employee basic information.

This code adds the Employee entity created by the ASP.NET MVC model binder to the Employees entity set and then saves the changes to the database.

The ValidateAntiForgeryToken attribute helps prevent cross-site request forgery attacks.

EmployeeController.cs –> Create

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(
   [Bind(Include = "FirstName, LastName, JoiningDate")]
   Employee employee)
{
   try
   {
      if (ModelState.IsValid)
      {
         db.Employees.Add(employee);
         db.SaveChanges();
         return RedirectToAction("Index");
      }
   }
   catch (DataException ex)
   {
      //Log the error
      ModelState.AddModelError("", "Unable to save. Try again.");
   }
   return View(employee);
}

Employee.cs

public class Employee
   {
      public int ID { get; set; }
      public string LastName { get; set; }
      public string FirstName { get; set; }
      public DateTime JoiningDate { get; set; }
      public string City { get; set; }

    }

For example, suppose the Employee entity includes a City property that you don’t want this web page to update. Even if you don’t have a City field on the web page, a hacker could use a tool such as fiddler, or write some JavaScript, to post a City form value. Without the Bind attribute limiting the fields that the model binder uses when it creates an Employee instance, the model binder would pick up that City form value and use it to update the Employee entity instance. Then whatever value the hacker specified for the City form field would be updated in your database.

It’s a security best practice to use the Include parameter with the Bind attribute to whitelist fields. It’s also possible to use the Exclude parameter to blacklist fields you want to exclude. The reason Include is more secure is that when you add a new property to the entity, the new field is not automatically protected by an Exclude list.

Another alternative approach, and one preferred by many, is to use only view models with model binding. The view model contains only the properties you want to bind. Once the MVC model binder has finished, you copy the view model properties to the entity instance.