Blazor AutoComplete

The Blazor AutoComplete component is a textbox that offers to users list of hints to select from as they type. Users can write their own value or select a suggestion from the dropdown and populate the input. 

The AutoComplete is a powerful, full-featured UI component that can be bound to data and offers multiple built-in features such as filtering, localization and keyboard navigation. The AutoComplete appearance can be customized by using templates or dimensions and works in both WebAssembly (WASM) and Server-side Blazor apps. 

Check out the Blazor AutoComplete demo

The AutoComplete component supports binding to primitive types (such as simple collection of int, string or other data types) or data models in Blazor applications. 

AutoComplete data binding example. 

The Blazor AutoComplete component enables you to speed-up and simplify users search of values via its Filterable parameter. This way the control will filter the available suggestions according to the current user input. 

The AutoComplete offers additional parameters to fine-tune filtering and searching:  

• MinLength – allows you to control when the filter list will appear

• FilterOperator – lets you define filtering operator such as “startswith”, “contains”, “endswith” etc.

• Header Template – enables you to define custom content in the header of the list when it is expanded
• Item Template – lets you customize the appearance of individual list items
• Footer Template – enables you to define custom content in the bottom of the list when it is expanded
• No Data Template – allows you to customize the dropdown message when there are no items to be displayed

AutoComplete is a flexible component that also allows custom operations. You can implement custom (server) filtering and set a data source dynamically through the OnRead event. 

Blazor AutoComplete filtering example. 

You have several events available for capturing and handling changes to the values in the AutoComplete component:  

• OnRead – fires upon component initialization and user filtering 

• ValueChanged - fires upon user selection change  

• OnChange - fires only when the user presses Enter, or blurs the input (for example, clicks outside of the component) 

• OnBlur - an event which is triggered when it loses focus

Like all other Telerik UI for Blazor components, the AutoComplete component supports out-of-the-box Keyboard Navigation and web accessibility standards implementation standards (including WCAG, Section 508 and WAI-ARIA attributes for screen readers). This enables easy navigation and selection of values in AutoComplete using just a keyboard, as well as access to component content through assistive technologies.

Explore the full list of supported keys in the Blazor AutoComplete keyboard navigation demo

The AutoComplete control has built-in localization support, which makes it easy to translate texts to any language that your Blazor app may require. 

Demo of AutoComplete component with various languages. 

The Telerik Blazor AutoComplete component has several built-in themes such as Default (our own styling), Material (based on the Material Design guidelines), Bootstrap (which looks like the Bootstrap styling to integrate better) and Fluent (based on Microsoft Fluent UI).  

You can easily customize any of out-of-the-box themes with a few lines of CSS, or create new theme to match your colors and branding by using the Telerik SASS ThemeBuilder application.