Getting Started with ASP.NET Core DropDownList Control
19 Dec 20224 minutes to read
This section briefly explains about how to include ASP.NET Core DropDownList control in your ASP.NET Core application using Visual Studio.
Prerequisites
System requirements for ASP.NET Core controls
Create ASP.NET Core web application with Razor pages
Install ASP.NET Core package in the application
Syncfusion ASP.NET Core controls are available in nuget.org. Refer to NuGet packages topic to learn more about installing NuGet packages in various OS environments. To add ASP.NET Core controls in the application, open the NuGet package manager in Visual Studio (Tools → NuGet Package Manager → Manage NuGet Packages for Solution), search for Syncfusion.EJ2.AspNet.Core and then install it.
NOTE
The Syncfusion.EJ2.AspNet.Core NuGet package has dependencies, Newtonsoft.Json for JSON serialization and Syncfusion.Licensing for validating Syncfusion license key.
Add Syncfusion ASP.NET Core Tag Helper
Open ~/Views/_ViewImports.cshtml
file and import the Syncfusion.EJ2
TagHelper.
@addTagHelper *, Syncfusion.EJ2
Add style sheet
Checkout the Themes topic to learn different ways (CDN, NPM package, and CRG) to refer styles in ASP.NET Core application, and to have the expected appearance for Syncfusion ASP.NET Core controls. Here, the theme is referred using CDN inside the <head>
of ~/Pages/Shared/_Layout.cshtml
file as follows,
<head>
...
<!-- Syncfusion ASP.NET Core controls styles -->
<link rel="stylesheet" href="https://cdn.syncfusion.com/ej2/21.1.35/fluent.css" />
</head>
Add script reference
In this getting started walk-through, the required scripts are referred using CDN inside the <head>
of ~/Pages/Shared/_Layout.cshtml
file as follows,
<head>
...
<!-- Syncfusion ASP.NET Core controls scripts -->
<script src="https://cdn.syncfusion.com/ej2/21.1.35/dist/ej2.min.js"></script>
</head>
Register Syncfusion Script Manager
Open ~/Pages/Shared/_Layout.cshtml
page and register the script manager
<body>
...
<!-- Syncfusion ASP.NET Core Script Manager -->
<ejs-scripts></ejs-scripts>
</body>
Add ASP.NET Core DropDownList control
Now, add the Syncfusion ASP.NET Core DropDownList tag helper in ~/Pages/Index.cshtml
page.
@{
...
var data = new string[] { "Badminton", "Basketball", "Cricket", "Football", "Golf", "Gymnastics", "Hockey", "Tennis" };
}
<ejs-dropdownlist id="games" dataSource="data"> </ejs-dropdownlist>
Press Ctrl+F5 (Windows) or ⌘+F5 (macOS) to run the app. Then, the Syncfusion ASP.NET Core DropDownList control will be rendered in the default web browser.
Binding data source
After initialization, populate the DropDownList with data using the dataSource property. Here, an array of string values is passed to the DropDownList component.
@{
...
var data = new string[] { "Badminton", "Basketball", "Cricket", "Football", "Golf", "Gymnastics", "Hockey", "Tennis" };
}
<ejs-dropdownlist id="games" dataSource="data" placeholder="Select a game" popupHeight="220px">
</ejs-dropdownlist>
Configure the popup list
By default, the width of the popup list automatically adjusts according to the DropDownList input element’s width, and the height of the popup list has ‘300px’.
The height and width of the popup list can also be customized using the popupHeight and popupWidth properties respectively.
@{
...
var data = new string[] { "Badminton", "Basketball", "Cricket", "Football", "Golf", "Gymnastics", "Hockey", "Tennis" };
}
<ejs-dropdownlist id="games" dataSource="data" popupWidth="300px" placeholder="Select a game" popupHeight="220px">
</ejs-dropdownlist>
NOTE