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Part 34 Generating a dropdownlist control in mvc using HTML helpers
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To generate a dropdownlist, use DropDownList html helper. A dropdownlist in MVC is a collection of SelectListItem objects. Depending on your project requirement you may either hard code the values in code or retrieve them from a database table. In this video, we will discuss both the approaches. • Healthy diet is very important both for the body and mind. If you like Aarvi Kitchen recipes, please support by sharing, subscribing and liking our YouTube channel. Hope you can help. • / @aarvikitchen5572 • Generating a dropdownlist using hard coded values: We will use the following overloaded version of DropDownList html helper. • DropDownList(string name, IEnumerable[SelectListItem] selectList, string optionLabel) • The following code will generate a departments dropdown list. The first item in the list will be Select Department . • @Html.DropDownList( Departments , new List[SelectListItem] • { • new SelectListItem { Text = IT , Value = 1 , Selected=true}, • new SelectListItem { Text = HR , Value = 2 }, • new SelectListItem { Text = Payroll , Value = 3 } • }, Select Department ) • The downside of hard coding dropdownlist values with-in code is that, if we have to add or remove departments from the dropdownlist, the code needs to be modified. • In most cases, we get values from the database table. For this example, let's use entity framework to retrieve data. Add ADO.NET entity data model. We discussed working with entity framework in Parts 8 25. • To pass list of Departments from the controller, store them in ViewBag • public ActionResult Index() • { • // Connect to the database • SampleDBContext db = new SampleDBContext(); • // Retrieve departments, and build SelectList • ViewBag.Departments = new SelectList(db.Departments, Id , Name ); • • return View(); • } • Now in the Index view, access Departments list from ViewBag • @Html.DropDownList( Departments , Select Department ) • Text version of the video • http://csharp-video-tutorials.blogspo... • Slides • http://csharp-video-tutorials.blogspo... • All ASP .NET MVC Text Articles • http://csharp-video-tutorials.blogspo... • All ASP .NET MVC Slides • http://csharp-video-tutorials.blogspo... • All Dot Net and SQL Server Tutorials in English • https://www.youtube.com/user/kudvenka... • All Dot Net and SQL Server Tutorials in Arabic • / kudvenkatarabic
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