We’re going to create a contact form in ASP.NET MVC 2.0, that uses Ajax to send the form data and that uses client side validation to improve the user experience for our users.
Start by creating a new ASP.NET MVC 2.0 web application project in Visual Studio.
This will create a new project with the default ASP.NET MVC 2.0 sample code.
Inside the Models folder create a new class, and give it the name: Contact.cs. The class is very simple with just some properties for Name, Email and Comment.
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
namespace ContactForm.Models
{
public class Contact
{
[Required(ErrorMessage = "You need to fill in a name")]
[DisplayName("Name")]
public string Name { get; set; }
[Required(ErrorMessage = "You need to fill in an email address")]
[DataType(DataType.EmailAddress, ErrorMessage = "Your email address contains some errors")]
[DisplayName("Email address")]
public string Email { get; set; }
[Required(ErrorMessage = "You need to fill in a comment")]
[DisplayName("Your comment")]
public string Comment { get; set; }
}
}Notice the Required, DisplayName and DataType attributes. This is called DataAnnotations, and is a new feature in ASP.NET MVC 2.0, which helps us add validation logic to our models.
Next step is creating the /home/contact URL and the contact view. Open up HomeController.cs, and add the following method.
public ActionResult Contact()
{
return View();
}Place your cursor inside View() and press Ctrl+M, Ctrl+V, or just right-click and choose Add View. Check the “Create a strongly-typed view” and type in: ContactForm.Models.Contact.
<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<ContactForm.Models.Contact>" %>
<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
Contact
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<h2>Contact</h2>
</asp:Content>We can now create the form markup.
<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<ContactForm.Models.Contact>" %>
<asp:Content ContentPlaceHolderID="TitleContent" runat="server">
Contact us
</asp:Content>
<asp:Content ContentPlaceHolderID="MainContent" runat="server">
<% Html.EnableClientValidation(); %>
<% using (Ajax.BeginForm(new AjaxOptions { HttpMethod = "Post", OnComplete = "Contact.onComplete"}))
{ %>
<%: Html.ValidationSummary(true, "A few fields are still empty") %>
<fieldset>
<legend>Contact us</legend>
<div class="editor-label">
<%: Html.LabelFor(m => m.Name) %>
</div>
<div class="editor-field"><%: Html.TextBoxFor(m => m.Name) %>
<%: Html.ValidationMessageFor(m => m.Name) %>
</div>
<div class="editor-label">
<%: Html.LabelFor(m => m.Email) %>
</div>
<div class="editor-field">
<%: Html.TextBoxFor(m => m.Email) %>
<%: Html.ValidationMessageFor(m => m.Email) %>
</div>
<div class="editor-label">
<%: Html.LabelFor(m => m.Comment) %>
</div>
<div class="editor-field">
<%: Html.TextAreaFor(m => m.Comment, 10, 25, null) %>
<%: Html.ValidationMessageFor(m => m.Comment) %>
</div>
<p>
<input type="submit" value="Submit" />
</p>
</fieldset>
<p id="result"><%: TempData["Message"] %></p>
<% } %>
</asp:Content><%: … %> is just a shortcut for HTML encoding the data, a new feature in ASP.NET 4.0. <% Html.EnableClientValidation(); %> enables client side validation for us, and must be included right before the start of the form. Ajax.BeginForm is a helper method that generates the form tag for us and attaches a little JavaScript code for sending the form data with Ajax, if the client supports it, otherwise the form data will be sent like normal.
Lets create the JavaScript method that gets called when the form is finished. Create a new JavaScript file inside the Scripts folder and give it the name: Site.js. Add the Contact object with the property function onComplete.
var Contact = {
onComplete: function (content) {
var result = eval(content.get_response().get_object());
var textNode = document.createTextNode(result.message);
document.getElementById("result").appendChild(textNode);
}
};I take the JSON result from the server and add the message to the result paragraph.
If you press F5, the site should open up in your default browser. If you add Home/Contact behind the URL, you should be taken to the Contact Us page.
For the client side validation to work we need to reference a few JavaScript files. Open up Site.master (located in the shared folder), and add the following code right before the closing body tag.
...
<script src="../../Scripts/MicrosoftAjax.js" type="text/javascript"></script>
<script src="../../Scripts/MicrosoftMvcAjax.js" type="text/javascript"></script>
<script src="../../Scripts/MicrosoftMvcValidation.js" type="text/javascript"></script>
<script src="../../Scripts/Site.js" type="text/javascript"></script>
</body>
</html>
You should now receive some friendly error messages when you click the submit button without filling out the form properly.
Next step is adding the action method to HomeController.cs that will handle the form data.
[HttpPost]
public ActionResult Contact(Contact model)
{
string message = "There are a few errors";
if (ModelState.IsValid)
{
message = "Thanks! We'll get back to you soon.";
}
if (Request.IsAjaxRequest())
{
return new JsonResult { ContentEncoding = Encoding.UTF8, Data = new { success = true, message = message } };
}
TempData["Message"] = message;
return View();
}Notice that I check if the request is an Ajax request, if it is I return a JSON object with the result, otherwise I return the whole view with the message.
You would also add some other logic here for saving the message in some way.
That’s it!
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