ASP.NET MVC is a popular web development framework that allows developers to create dynamic and interactive web applications. One of the key features of this framework is the ability to submit form data using Ajax, which enables a seamless and efficient user experience. In this article, we will explore how to use the DropDownList control in ASP.NET MVC with Ajax form submission.
To get started, we first need to create a new ASP.NET MVC project. Open Visual Studio and select "File" > "New" > "Project". In the "New Project" window, select "ASP.NET Web Application" and give your project a name. Make sure to select "MVC" as the project template and click "OK" to create the project.
Once the project is created, we can start by adding a controller and a view. Right-click on the "Controllers" folder and select "Add" > "Controller". Give your controller a name and click "Add". In the controller, we will create an action method that will return a view with a DropDownList control.
```
public class HomeController : Controller
{
public ActionResult Index()
{
ViewBag.Countries = new List<SelectListItem>
{
new SelectListItem { Text = "USA", Value = "USA" },
new SelectListItem { Text = "Canada", Value = "Canada" },
new SelectListItem { Text = "UK", Value = "UK" },
new SelectListItem { Text = "Australia", Value = "Australia" }
};
return View();
}
}
```
In the above code, we are creating a list of countries and passing it to the view using the ViewBag object. Now, let's create a view for this action method. Right-click on the "Views" folder and select "Add" > "View". Give your view a name and make sure to select the "Create as a partial view" option. This will allow us to render this view inside another view. In the view, we will add a form with the DropDownList control.
```
@model YourProjectName.Models.YourModel
@using (Ajax.BeginForm("Submit", "Home", new AjaxOptions { HttpMethod = "Post" }))
{
@Html.DropDownListFor(m => m.Country, ViewBag.Countries as List<SelectListItem>, "Select Country", new { @class = "form-control" })
<input type="submit" value="Submit" />
}
```
In the above code, we are using the DropDownListFor helper method to render a DropDownList control. We are also passing the list of countries to the control and setting a default text of "Select Country". We have also added a submit button to the form. Notice that we have set the form to use the "Post" method and we have specified the controller and action to be called on form submission.
Next, we need to create an action method in the controller to handle the form submission. In the controller, add the following action method.
```
[HttpPost]
public ActionResult Submit(YourModel model)
{
// Code to handle form submission
return PartialView("_Success");
}
```
In the above code, we are adding the [HttpPost] attribute to the action method to indicate that it will handle the form submission. We are also passing a model as a parameter which will contain the selected country from the DropDownList control. In this example, we are simply returning a partial view called "_Success", which will be rendered on successful form submission.
