I am working on creating a blog with ASP.Net 4, MVC 3, Razor and C#.
There are 2 seperate tables. 1 for the actual blog post and a relationship table for categories.
The categories displays as a dropdown.
I want to add the ability to add a new category using Ajax so the user does not lose what they have already entered into the form.
What would be the best way to accomplish this?
Here is what I have right now.
Controller Code
public ActionResult Create()
{
ViewBag.category_id = new SelectList(_db.Categories, "id", "category_name");
return View();
}
Razor View
#model NPP.Models.News
#{
ViewBag.Title = "Create News Item";
}
<h2>Create News Item</h2>
<script src="#Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
<script src="#Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>
#using (Html.BeginForm()) {
#Html.ValidationSummary(true)
<fieldset>
<legend>News</legend>
<div class="editor-label">
#Html.LabelFor(model => model.news_title, "Title")
</div>
<div class="editor-field">
#Html.EditorFor(model => model.news_title)
#Html.ValidationMessageFor(model => model.news_title)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.news_content, "Content")
</div>
<div class="editor-field">
#Html.TextAreaFor(model => model.news_content)
#Html.ValidationMessageFor(model => model.news_content)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.news_teaser, "Teaser (optional)")
</div>
<div class="editor-field">
#Html.TextAreaFor(model => model.news_teaser)
#Html.ValidationMessageFor(model => model.news_teaser)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.category_id, "Category")
</div>
<div class="editor-field">
#Html.DropDownList("category_id", String.Empty)
#Html.ValidationMessageFor(model => model.category_id)
</div>
<p>
<input type="submit" value="Create" />
</p>
</fieldset>
}
<div>
#Html.ActionLink("Back to List", "Index")
</div>
Thanks for any help in advance. My layout page includes jquery which I would prefer to use.
Add another controler method to return you a list of categories, something like:
public JsonResult Categories()
{
return Json(DB.GetCategorys(), JsonRequestBehavior.AllowGet);
}
Then on the client side, use ajax to get your categories and bind them to your drop down, something like:
$.ajax({
url: 'http://myserver/myapp/mycontroller/Categories',
success: function(data) {
$('#dropCategorys').html('');
$.each(data, function(i, e) {
$('#dropCategorys').append('<option value="' +
e.category_id + '">' + e.category_name + '</option>');
}
}
});
This won't save your current selected item, but you can always check that before clearing the list, and reset it afterwards.
Creating the Category separately via AJAX is not your only option. You could then have a view model like this:
public class CategoryViewModel
{
public string name { get; set; }
public int id { get; set; }
}
public class CreateNewsViewModel
{
public string news_title { get; set; }
public string news_content { get; set; }
public string news_teaser { get; set; }
public string CategoryViewModel category { get; set; }
}
Change your view at the category field:
<div class="editor-label">
#Html.LabelFor(model => model.category, "Category")
</div>
<div class="editor-field">
#Html.DropDownListFor(model => model.category.id, ViewBag.category_id)
#Html.EditorFor(model => model.category.name) <!-- only show when creating a new category -->
#Html.ValidationMessageFor(model => model.category)
</div>
Then your action would look something like this:
[HttpPost, ActionName("Create")]
public ActionResult DoCreate(CreateNewsViewModel model)
{
if (ModelState.IsValid)
{
if (model.category.id == 0)
{
// create your new category using model.category.name
}
// create an entity from the model and save to your database
return RedirectToAction("Index", "News"); // do whatever you wish when you're done
}
return View("Create", model); // show Create view again if validation failed
}
This is more or less off the top of my head so let me know if I bollocks'ed any parts up.
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I have worked with .Net webforms before and now working on a MVC project.
I am working on creating a user registration page. I have no idea how its MODEL should look like.
See database diagram
User registration page:
Firstname
LastName
Email adress
Subcribe newsletter ?
Password
Choose your city
.....
I think I have to do this in this task:
STEP 1:
Populate cities dropdownList (choose your city) with data from database
STEP 2:
Insert users email address in UserEmail table and set subcribe to 0 or 1
STEP 3:
Save user registration data and EmailID (get from UserEmails table), CityID into Users table
Should I make a large MODEL , like this :
Public Class Registration Model
{
Get, set:
all USEREMAIL plugs ties
all Users plugs ties
all Cities plugs ties
}
How to start with this task in MVC?
(I know how to develop this in webforms , but MVC model confuses me)
You were on the right track.You're trying to create a view which let's users complete a registertion form, this view needs to use the user model and at the same type display a list of cities in a drop down which come from a different table in the database but are related to the user.
In MVC there's a concept called viewmodel, all that it is is a simple class which combines one or more models together.
Below I created a model called SiteUser and then another model called SiteUserViewModel which inherits from the user and gives us all the user properties PLUS an additional property we can use to populate the cities.So when we display the page, we will use the SiteUserViewModel but when we post to the controller to save the user in the database we will use SiteUser:
Models:
namespace MVCTutorial.Models
{
public class SiteUser
{
[Display(Name="First Name")]
public string FirstName { get; set; }
[Display(Name = "Last Name")]
public string LastName { get; set; }
[DataType(DataType.EmailAddress)]
public string EmailAddress { get; set; }
[Display(Name = "Subscribe To Newsletter?")]
public bool SubscribeToNewsletter { get; set; }
[DataType(DataType.Password)]
public string Password { get; set; }
[Display(Name="City")]
public int CityId { get; set; }
}
public class SiteUserViewModel : SiteUser
{
public List<SelectListItem> Cities { get; set; }
}
}
Controller:
public class SiteUserController : Controller
{
[HttpGet]
public ActionResult Index()
{
var model = new SiteUserViewModel();
//Replace this with logic that reads cities from the database
var city1 = new SelectListItem { Text = "Johannesburg", Value = "1" };
var city2 = new SelectListItem { Text = "Cape Town", Value = "2" };
model.Cities = new List<SelectListItem> { city1, city2 };
return View(model);
}
[HttpPost]
public ActionResult CreateUser(SiteUser user)
{
System.Diagnostics.Debugger.Break();
//Write the code to add user to the database
return View();
}
}
View:
#model MVCTutorial.Models.SiteUserViewModel
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Create User</title>
</head>
<body>
#using (Html.BeginForm("CreateUser", "SiteUser"))
{
#Html.ValidationSummary(true)
<fieldset>
<legend>Site User</legend>
<div class="editor-label">
#Html.LabelFor(model => model.FirstName)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.FirstName)
#Html.ValidationMessageFor(model => model.FirstName)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.LastName)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.LastName)
#Html.ValidationMessageFor(model => model.LastName)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.EmailAddress)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.EmailAddress)
#Html.ValidationMessageFor(model => model.EmailAddress)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.SubscribeToNewsletter)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.SubscribeToNewsletter)
#Html.ValidationMessageFor(model => model.SubscribeToNewsletter)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.Password)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.Password)
#Html.ValidationMessageFor(model => model.Password)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.CityId)
</div>
<div class="editor-field">
#Html.DropDownList("CityId", Model.Cities, "Please select one")
</div>
<p>
<input type="submit" value="Create" />
</p>
</fieldset>
}
</body>
</html>
Result:
I am new to ASP.NET MVC and I am having trouble updating the model data and then displaying it my view.
I currently have a MortgageCalculator class that I am using as a model.
public double loan_amount { get; set; }
public double interest { get; set; }
public int loan_duration { get; set; }
public int payments_year { get; set; }
Code for the controller is:
[httpGet]
public ActionResult M_Calculator()
{
var mortgageCalculator = new MortgageCalculator();
return View(mortgageCalculator);
}
[HttpPost]
public ActionResult M_Calculator(MortgageCalculator mortgageCalculator)
{
UpdateModel(mortgageCalculator);
return RedirectToAction("Results");
}
public ActionResult Results (MortgageCalculator mortgageCalculator)
{
return View(mortgageCalculator);
}
Code for my view is:
#using (Html.BeginForm())
{
<fieldset>
<legend>Mortgage Calculator</legend>
<div class="editor-label">
#Html.LabelFor(model => model.loan_amount)
</div>
<div class="editor-field">
#Html.TextBoxFor(model => model.loan_amount)
</div>
<br />
<div class="editor-label">
#Html.LabelFor(model => model.interest)
</div>
<div class="editor-field">
#Html.TextBoxFor(model => model.interest)
</div>
<br />
<div class="editor-label">
#Html.LabelFor(model => model.loan_duration)
</div>
<div class="editor-field">
#Html.TextBoxFor(model => model.loan_duration)
</div>
<br />
<div class="editor-label">
#Html.LabelFor(model => model.payments_year)
</div>
<div class="editor-field">
#Html.TextBoxFor(model => model.payments_year)
</div>
<br />
<input type="submit" value="Calculate" />
</fieldset>
}
I want to make some calculations on the data that I receive from the user and then show the results in my Results view. I don't have any database. I just want to perform simple calculations on data and show the results. The solution seems to be pretty straight forward but I am stuck. I would appreciate any help.
Instead of redirect user to another action you should return your model with the result populated, like this:
[HttpPost]
public ActionResult M_Calculator(MortgageCalculator mortgageCalculator)
{
UpdateModel(mortgageCalculator);
return View("Results", mortgageCalculator);
}
If you don't want to create another view only to show the results, just remove the first parameter that indicates which view ASP.NET MVC should use, so, it will use the default view.
I'll try to be clear. I'm developing a web application based on MVC 4 and Entity Framework. Through this app, I can create some Products which is depending on an other table which is Product Types As you can see, in my create product View, I have a dropdownlist which contains the product types :
#model BuSIMaterial.Models.Product
#{
ViewBag.Title = "Create";
}
<h2>
Create</h2>
#using (Html.BeginForm())
{
#Html.ValidationSummary(true)
<fieldset>
<legend>Product</legend>
<div class="editor-label">
Purchase date :
</div>
<div class="editor-field">
#Html.TextBoxFor(model => model.PurchaseDate, new { #class = "datepicker"})
#Html.ValidationMessageFor(model => model.PurchaseDate)
</div>
<div class="editor-label">
Serial number :
</div>
<div class="editor-field">
#Html.TextBoxFor(model => model.SerialNumber, new { maxlength = 50 })
#Html.ValidationMessageFor(model => model.SerialNumber)
</div>
<div class="editor-label">
Product type :
</div>
<div class="editor-field">
#Html.DropDownList("Id_ProductType", String.Empty)<a href="../ProductType/Create">Add
a new product type?</a>
#Html.ValidationMessageFor(model => model.Id_ProductType)
</div>
<div class="form-actions">
<button type="submit" class="btn btn-primary">Create</button>
</div>
</fieldset>
}
And in my create product type View, I have a dropdownlist of existing product companies (so the same relation which exists between product and product type :
#model BuSIMaterial.Models.ProductType
#{
ViewBag.Title = "Create";
}
<h2>Create</h2>
#using (Html.BeginForm()) {
#Html.ValidationSummary(true)
<fieldset>
<legend>ProductType</legend>
<div class="editor-label">
Model :
</div>
<div class="editor-field">
#Html.TextBoxFor(model => model.Model, new { maxlength = 50 })
#Html.ValidationMessageFor(model => model.Model)
</div>
<div class="editor-label">
Catalog Price :
</div>
<div class="editor-field">
#Html.EditorFor(model => model.CatalogPrice)
#Html.ValidationMessageFor(model => model.CatalogPrice)
</div>
<div class="editor-label">
Company :
</div>
<div class="editor-field">
#Html.DropDownList("Id_ProductCompany", String.Empty)<a href ="../ProductCompany/Create" >Add a new company?</a>
#Html.ValidationMessageFor(model => model.Id_ProductCompany)
</div>
<div class="form-actions">
<button type="submit" class="btn btn-primary">Create</button>
</div>
</fieldset>
}
What I tried is to "mix" these 2 views in one Create Product View. So I think my action will change a little bit. Also, I think I'll have to do 2 adds in my database. Is it the best way to do what I want?
UPDATE : by using a viewmodel, I got this :
My View Model :
public class ProductViewModel
{
[Required]
public Product Product { get; set; }
[Required]
public ProductType ProductType { get; set; }
}
My Create Action :
[HttpPost]
public ActionResult CreateFullProduct(ProductViewModel pvm)
{
ViewBag.Id_ProductCompany = new SelectList(db.ProductCompanies, "Id_ProductCompany", "Name", pvm.ProductType.Id_ProductCompany);
if (ModelState.IsValid)
{
Product product = new Product { PurchaseDate = pvm.Product.PurchaseDate,
SerialNumber = pvm.Product.SerialNumber,
Id_ProductType = pvm.ProductType.Id_ProductType};
ProductType productType = new ProductType {Model = pvm.ProductType.Model,
CatalogPrice = pvm.ProductType.CatalogPrice,
Id_ProductCompany = pvm.ProductType.Id_ProductCompany};
db.ProductTypes.AddObject(productType);
db.Products.AddObject(product);
db.SaveChanges();
return RedirectToAction("Index", "Person");
}
return View(pvm);
}
When I try to save the new entries, I got this issue : The INSERT statement conflicted with the FOREIGN KEY constraint "FK_bm_ProductTypes_bm_ProductCompanies".
As Products are "dependent" on ProductTypes, merging them into one is a good idea. You'll have to merge the post action too, which will have 2 inserts into your database (which is correct, one for Product, one for ProductType.
You'll have to put them both in one Model too so you can use it in your view, something like:
public class ProductViewModel
{
public Product Product { get; set; }
public ProductType ProductType { get; set; }
}
EDIT: Your problem with your saving is because the ProductComany is not being posted (as indiciated in Chat)
To fix that, first we'll put the values for the Dropdown in the model:
public class ProductViewModel
{
public Product Product { get; set; }
public ProductType ProductType { get; set; }
public List<SelectListItem> ProductCompanies { get; set; }
}
Then populate it in your HttpGet and HttpPost by doing:
model.ProductCompanies = db.ProductCompanies
.ToList()
.Select(s => new SelectListItem
{
Text = s.Name,
Value = s.Id.ToString()
})
.ToList();
Then in your view you can do:
#Html.DropDownListFor(m => m.ProductType.Id_ProductCompany, Model.ProductCompanies)
I am using asp.net mvc 4
Is there a way to update the form based on selection made by the user?
(in this case I want to fill in address fields if something is picked from the dropdown list, otherwise a new address would need to be typed in)
My model:
public class NewCompanyModel
{
[Required]
public string CompanyName { get; set; }
public bool IsSameDayRequired { get; set; }
public int AddressID { get; set; }
public Address RegisterOfficeAddress { get; set; }
}
View:
#model ViewModels.NewCompanyModel
#using (Html.BeginForm(null, null, FormMethod.Post, new { name = "frm", id = "frm" }))
{
#Html.ValidationSummary(true)
<fieldset id="test">
<legend>Company</legend>
<h2>Register office address</h2>
<div class="editor-label">
#Html.LabelFor(model => model.AddressID)
</div>
<div class="editor-field">
#Html.DropDownListFor(model => model.AddressID, (IList<SelectListItem>)ViewBag.Addresses, new {id = "address", onchange = "window.location.href='/wizard/Address?value=' + this.value;" })
</div>
<div class="editor-label">
#Html.LabelFor(model => model.RegisterOfficeAddress.BuildingNameOrNumber)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.RegisterOfficeAddress.BuildingNameOrNumber)
#Html.ValidationMessageFor(model => model.RegisterOfficeAddress.BuildingNameOrNumber)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.RegisterOfficeAddress.StreetName)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.RegisterOfficeAddress.StreetName)
#Html.ValidationMessageFor(model => model.RegisterOfficeAddress.StreetName)
</div>
and controller:
public ActionResult Address(string value)
{
//get the address from db and somehow update the view
}
The question is how do you update the 'model.RegisterOfficeAddress.StreetName' etc
Just to make clear this is just part of the form so I cannot submit it just yet.
Many thanks
Thanks for your help; I have decided to take a different approach:
On dropdown change I submit the form:
<div class="editor-label">
#Html.LabelFor(model => model.ServiceAddress.AddressID)
</div>
<div class="editor-field">
#Html.DropDownListFor(model => model.ServiceAddress.AddressID, (IEnumerable<SelectListItem>)ViewBag.Addresses, new { onchange = "this.form.submit();" })
#Html.ValidationMessageFor(model => model.ServiceAddress.AddressID)
</div>
and then in controller:
[HttpPost]
public ActionResult NewDirector(NewDirectorVM vm, string value)
{
ModelState.Clear();
if (vm.ServiceAddress.AddressID > 0)
{
//Updates the properties of the viewModel
vm.ServiceAddress = _Repository.GetAddress(vm.ServiceAddress.AddressID);
}
return View("NewDirector", vm);
}
Please notice ModelState.Clear(); which actually allows the view to be updated from the controller (otherwise all the changes made the the viewModel by the controller would have been overwritten by the values in the view).
Common way in such cases is to update other fields via javascript:
$('##Html.IdFor(model => model.AddressID)').on('change',function(){
$.get(...,function(data){
$('##Html.IdFor(model => model.RegisterOfficeAddress.BuildingNameOrNumber)').val(data)
})
})
This is my first MVC3 project and thought it'd be a bit simpler to accomplish this, but I've had a lot of issues. This seems to be the one trouble for which I've not encountered a solution. Posting here as a last resort.
My issue is that the Ingredients list never seems to populate in the database when a new Recipe is created. I've even tried hard-coding a list in the controller when the rest of the data is saved, but it still doesn't do anything. As far as I can tell, there's not even a field for Ingredients in the DB anywhere. Can anyone point out what I'm doing wrong? Much thanks.
Model:
public class Recipe
{
public int ID { get; set; }
[Required]
public string Title { get; set; }
[Required]
[Display(Name = "Type of Meal")]
public int TypeID { get; set; }
[Required]
public string Instructions { get; set; }
[Display(Name = "Submitted By")]
public string UserName { get; set; }
public IList<string> Ingredients { get; set; }
public virtual MealType Type { get; set; }
}
Create View:
#model final.Models.Recipe
#{
ViewBag.Title = "Recipe Finder - New Recipe";
}
<h2>New Recipe</h2>
<script src="#Url.Content("~/Scripts/jquery.validate.min.js")" type="text/javascript"></script>
<script src="#Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js")" type="text/javascript"></script>
<script type="text/javascript">
//adds an ingredient field on the fly
var numIngredients = 0;
function addIngredient() {
$('#ingredientlist').append('<tr><td><input type="text" name="Ingredients[' + numIngredients++ + ']" value="' + $('#AddIngredient').val() + '" readonly="true" tabindex="-1" /></tr></td>');
$('#AddIngredient').val('');
$('#AddIngredient').focus();
}
function onKeyPress(e) {
var keycode;
if (window.event) {
keycode = window.event.keyCode;
}
else if (e) {
keycode = e.which;
}
else {
return true;
}
//for addingredient field, add ingredient and not submit
// else mimic submit
if (keycode == 13) {
if (document.activeElement.id == "AddIngredient") {
addIngredient();
return false;
}
document.getElementById('btnSubmit').click();
}
return true;
}
//intercepts form submit instead of using submit button to disable addingredient textbox
// this prevents the value/field from posting
function preSubmit() {
$('#AddIngredient').attr('disabled', 'true');
document.getElementsByTagName('form')[0].submit();
}
//intercepts users pressing the enter key
if (document.layers) document.captureEvents(Event.KEYPRESS);
document.onkeypress = onKeyPress;
</script>
#using (Html.BeginForm()) {
#Html.ValidationSummary(true)
<fieldset>
<legend>by #User.Identity.Name</legend>
<div class="editor-label">
#Html.LabelFor(model => model.Title)
</div>
<div class="editor-field">
#Html.EditorFor(model => model.Title)
#Html.ValidationMessageFor(model => model.Title)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.TypeID, "Type")
</div>
<div class="editor-field">
#Html.DropDownList("TypeID", String.Empty)
#Html.ValidationMessageFor(model => model.TypeID)
</div>
<div class="editor-label">
#Html.LabelFor(model => model.Ingredients)
</div>
<div class="editor-field">
#Html.TextBox("AddIngredient")
<input type="button" value="Add Ingredient" onclick="addIngredient()" tabindex="-1" />
<table id="ingredientlist">
</table>
</div>
<div class="editor-label">
#Html.LabelFor(model => model.Instructions)
</div>
<div class="editor-field">
#Html.TextAreaFor(model => model.Instructions, new { rows = "7", cols = "77" })
#Html.ValidationMessageFor(model => model.Instructions)
</div>
#Html.HiddenFor(model => model.UserName)
<p>
<input type="button" value="Submit" onclick="preSubmit()" id="btnSubmit" />
</p>
</fieldset>
}
Controller:
[HttpPost]
public ActionResult Create(Recipe recipe)
{
if (ModelState.IsValid)
{
db.Recipes.Add(recipe);
db.SaveChanges();
return RedirectToAction("Index");
}
ViewBag.TypeID = new SelectList(db.MealTypes, "ID", "Type", recipe.TypeID);
return View(recipe);
}
The POST fields I can see send all the information successfully, as seen below, I'm not sure what the issue is, or at this point what I haven't already tried.
Title:test recipe
TypeID:2
Ingredients[0]:test0
Ingredients[1]:test1
Ingredients[2]:test2
Ingredients[3]:test3
Instructions:this is a test
UserName:tym
You may want to check this page about storing a list of strings associated with an entity.