MVC 4 Edit modal form using Bootstrap

You should use partial views. I use the following approach:

Use a view model so you're not passing your domain models to your views:

public class EditPersonViewModel
{
    public int Id { get; set; }   // this is only used to retrieve record from Db
    public string Name { get; set; }
    public string Age { get; set; }
}

In your PersonController:

[HttpGet] // this action result returns the partial containing the modal
public ActionResult EditPerson(int id)
{  
    var viewModel = new EditPersonViewModel();
    viewModel.Id = id;
    return PartialView("_EditPersonPartial", viewModel);
}

[HttpPost] // this action takes the viewModel from the modal
public ActionResult EditPerson(EditPersonViewModel viewModel)
{
    if (ModelState.IsValid)
    {
        var toUpdate = personRepo.Find(viewModel.Id);
        toUpdate.Name = viewModel.Name;
        toUpdate.Age = viewModel.Age;
        personRepo.InsertOrUpdate(toUpdate);
        personRepo.Save();
        return View("Index");
    }
}

Next create a partial view called _EditPersonPartial. This contains the modal header, body and footer. It also contains the Ajax form. It's strongly typed and takes in our view model.

@model Namespace.ViewModels.EditPersonViewModel
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
    <h3 id="myModalLabel">Edit group member</h3>
</div>
<div>
@using (Ajax.BeginForm("EditPerson", "Person", FormMethod.Post,
                    new AjaxOptions
                    {
                        InsertionMode = InsertionMode.Replace,
                        HttpMethod = "POST",
                        UpdateTargetId = "list-of-people"
                    }))
{
    @Html.ValidationSummary()
    @Html.AntiForgeryToken()
    <div class="modal-body">
        @Html.Bootstrap().ControlGroup().TextBoxFor(x => x.Name)
        @Html.Bootstrap().ControlGroup().TextBoxFor(x => x.Age)
    </div>
    <div class="modal-footer">
        <button class="btn btn-inverse" type="submit">Save</button>
    </div>
}

Now somewhere in your application, say another partial _peoplePartial.cshtml etc:

<div>
   @foreach(var person in Model.People)
    {
        <button class="btn btn-primary edit-person" data-id="@person.PersonId">Edit</button>
    }
</div>
// this is the modal definition
<div class="modal hide fade in" id="edit-person">
    <div id="edit-person-container"></div>
</div>

    <script type="text/javascript">
    $(document).ready(function () {
        $('.edit-person').click(function () {
            var url = "/Person/EditPerson"; // the url to the controller
            var id = $(this).attr('data-id'); // the id that's given to each button in the list
            $.get(url + '/' + id, function (data) {
                $('#edit-person-container').html(data);
                $('#edit-person').modal('show');
            });
        });
     });
   </script>

In reply to Dimitrys answer but using Ajax.BeginForm the following works at least with MVC >5 (4 not tested).

1. write a model as shown in the other answers,

2. In the "parent view" you will probably use a table to show the data. Model should be an ienumerable. I assume, the model has an id-property. Howeverm below the template, a placeholder for the modal and corresponding javascript

   <table>
   @foreach (var item in Model)
   {
       <tr> <td id="[email protected]"> 
           @Html.Partial("dataRowView", item)
       </td> </tr>
   }
   </table>
   
   <div class="modal fade" id="editor-container" tabindex="-1" 
        role="dialog" aria-labelledby="editor-title">
       <div class="modal-dialog modal-lg" role="document">
           <div class="modal-content" id="editor-content-container"></div>
       </div>
   </div> 
   
   <script type="text/javascript">
       $(function () {
           $('.editor-container').click(function () {
               var url = "/area/controller/MyEditAction";  
               var id = $(this).attr('data-id');  
               $.get(url + '/' + id, function (data) {
                   $('#editor-content-container').html(data);
                   $('#editor-container').modal('show');
               });
           });
       });
   
       function success(data,status,xhr) {
           $('#editor-container').modal('hide');
           $('#editor-content-container').html("");
       }
   
       function failure(xhr,status,error) {
           $('#editor-content-container').html(xhr.responseText);
           $('#editor-container').modal('show');
       }
   </script>
   

note the "editor-success-id" in data table rows.

3. The dataRowView is a partial containing the presentation of an model's item.

   @model ModelView
   @{
       var item = Model;
   }
   <div class="row">
           // some data 
           <button type="button" class="btn btn-danger editor-container" data-id="@item.Id">Edit</button>
   </div>
   

4. Write the partial view that is called by clicking on row's button (via JS $('.editor-container').click(function () ... ).

   @model Model
   <div class="modal-header">
       <button type="button" class="close" data-dismiss="modal" aria-label="Close">
           <span aria-hidden="true">&times;</span>
       </button>
       <h4 class="modal-title" id="editor-title">Title</h4>
   </div>
   @using (Ajax.BeginForm("MyEditAction", "Controller", FormMethod.Post,
                       new AjaxOptions
                       {
                           InsertionMode = InsertionMode.Replace,
                           HttpMethod = "POST",
                           UpdateTargetId = "editor-success-" + @Model.Id,
                           OnSuccess = "success",
                           OnFailure = "failure",
                       }))
   {
       @Html.ValidationSummary()
       @Html.AntiForgeryToken()
       @Html.HiddenFor(model => model.Id)
       <div class="modal-body">
           <div class="form-horizontal">
               // Models input fields
           </div>
       </div>
       <div class="modal-footer">
           <button type="button" class="btn btn-default" data-dismiss="modal">Cancel</button>
           <button type="submit" class="btn btn-primary">Save</button>
       </div>
   }
   

This is where magic happens: in AjaxOptions, UpdateTargetId will replace the data row after editing, onfailure and onsuccess will control the modal.

This is, the modal will only close when editing was successful and there have been no errors, otherwise the modal will be displayed after the ajax-posting to display error messages, e.g. the validation summary.

But how to get ajaxform to know if there is an error? This is the controller part, just change response.statuscode as below in step 5:

5. the corresponding controller action method for the partial edit modal

   [HttpGet]
   public async Task<ActionResult> EditPartData(Guid? id)
   {
       // Find the data row and return the edit form
       Model input = await db.Models.FindAsync(id);
       return PartialView("EditModel", input);
   }
   
   [HttpPost, ValidateAntiForgeryToken]
   public async Task<ActionResult> MyEditAction([Bind(Include =
      "Id,Fields,...")] ModelView input)
   {
       if (TryValidateModel(input))
       {  
           // save changes, return new data row  
           // status code is something in 200-range
           db.Entry(input).State = EntityState.Modified;
           await db.SaveChangesAsync();
           return PartialView("dataRowView", (ModelView)input);
       }
   
       // set the "error status code" that will redisplay the modal
       Response.StatusCode = 400;
       // and return the edit form, that will be displayed as a 
       // modal again - including the modelstate errors!
       return PartialView("EditModel", (Model)input);
   }
   

This way, if an error occurs while editing Model data in a modal window, the error will be displayed in the modal with validationsummary methods of MVC; but if changes were committed successfully, the modified data table will be displayed and the modal window disappears.

Note: you get ajaxoptions working, you need to tell your bundles configuration to bind jquery.unobtrusive-ajax.js (may be installed by NuGet):

        bundles.Add(new ScriptBundle("~/bundles/jqueryajax").Include(
                    "~/Scripts/jquery.unobtrusive-ajax.js"));

I prefer to avoid using Ajax.BeginForm helper and do an Ajax call with JQuery. In my experience it is easier to maintain code written like this. So below are the details:

Models

public class ManagePeopleModel
{
    public List<PersonModel> People { get; set; }
    ... any other properties
}

public class PersonModel
{
    public int Id { get; set; }
    public string Name { get; set; }
    public int Age { get; set; }
    ... any other properties
}

Parent View

This view contains the following things:

• records of people to iterate through
• an empty div that will be populated with a modal when a Person needs to be edited
• some JavaScript handling all ajax calls

@model ManagePeopleModel

<h1>Manage People</h1>

@using(var table = Html.Bootstrap().Begin(new Table()))
{
    foreach(var person in Model.People)
    {
        <tr>
            <td>@person.Id</td>
            <td>@Person.Name</td>
            <td>@person.Age</td>
            <td>@html.Bootstrap().Button().Text("Edit Person").Data(new { @id = person.Id }).Class("btn-trigger-modal")</td>
        </tr>
    }
}

@using (var m = Html.Bootstrap().Begin(new Modal().Id("modal-person")))
{

}

@section Scripts
{
    <script type="text/javascript">
        // Handle "Edit Person" button click.
        // This will make an ajax call, get information for person,
        // put it all in the modal and display it
        $(document).on('click', '.btn-trigger-modal', function(){
            var personId = $(this).data('id');
            $.ajax({
                url: '/[WhateverControllerName]/GetPersonInfo',
                type: 'GET',
                data: { id: personId },
                success: function(data){
                    var m = $('#modal-person');
                    m.find('.modal-content').html(data);
                    m.modal('show');
                }
            });
        });

        // Handle submitting of new information for Person.
        // This will attempt to save new info
        // If save was successful, it will close the Modal and reload page to see updated info
        // Otherwise it will only reload contents of the Modal
        $(document).on('click', '#btn-person-submit', function() {
            var self = $(this);
            $.ajax({
                url: '/[WhateverControllerName]/UpdatePersonInfo',
                type: 'POST',
                data: self.closest('form').serialize(),
                success: function(data) {
                    if(data.success == true) {
                        $('#modal-person').modal('hide');
                        location.reload(false)
                    } else {
                        $('#modal-person').html(data);
                    }
                }
            });
        });
    </script>
}

Partial View

This view contains a modal that will be populated with information about person.

@model PersonModel
@{
    // get modal helper
    var modal = Html.Bootstrap().Misc().GetBuilderFor(new Modal());
}

@modal.Header("Edit Person")
@using (var f = Html.Bootstrap.Begin(new Form()))
{
    using (modal.BeginBody())
    {
        @Html.HiddenFor(x => x.Id)
        @f.ControlGroup().TextBoxFor(x => x.Name)
        @f.ControlGroup().TextBoxFor(x => x.Age)
    }
    using (modal.BeginFooter())
    {
        // if needed, add here @Html.Bootstrap().ValidationSummary()
        @:@Html.Bootstrap().Button().Text("Save").Id("btn-person-submit")
        @Html.Bootstrap().Button().Text("Close").Data(new { dismiss = "modal" })
    }
}

Controller Actions

public ActionResult GetPersonInfo(int id)
{
    var model = db.GetPerson(id); // get your person however you need
    return PartialView("[Partial View Name]", model)
}

public ActionResult UpdatePersonInfo(PersonModel model)
{
    if(ModelState.IsValid)
    {
        db.UpdatePerson(model); // update person however you need
        return Json(new { success = true });
    }
    // else
    return PartialView("[Partial View Name]", model);
}