Syncfusion aspnetcore accordion

Implementing Syncfusion Accordion

When to Use This Skill

use this skill when users need to:

• Organize content into collapsible sections
• Build FAQ or help sections with expandable items
• Create tabbed-like navigation with accordion panes
• Implement progressive disclosure of content
• Build hierarchical nested accordion structures
• Configure single or multiple expand modes
• Load accordion content dynamically from data sources
• Customize accordion animations and interactions
• Integrate accordion with ASP.NET Core applications

The Accordion component is the ideal choice whenever you need vertically stacked, collapsible content panels that display one or more panels at a time.

Component Overview

The Syncfusion Accordion is a vertically collapsible content panel control that:

• Supports Single and Multiple expand modes
• Handles static items and data-bound content
• Enables nested accordion structures for hierarchical content
• Provides animation configuration for expand/collapse actions
• Fires lifecycle events (created, expanding, expanded, collapsing, collapsed, clicked)
• Supports content loading from partial views or via POST requests
• Allows programmatic control through public methods like expandItem()
• Maintains state persistence across page reloads
• Provides RTL support and HTML sanitization

Documentation and Navigation Guide

Getting Started

📄 Read: references/getting-started.md

• System prerequisites and NuGet package installation
• TagHelper registration for ASP.NET Core
• Stylesheet and script resource configuration
• Creating your first Accordion control
• Understanding AccordionItem structure and markup patterns

Expand Modes & Behavior

📄 Read: references/expand-modes.md

• Single expand mode: mutually exclusive item expansion
• Multiple expand mode: independent item expansion (default)
• Toggle behavior and user interactions
• Keeping a single pane open always
• Expand mode configuration examples

Data Binding & Dynamic Content

📄 Read: references/data-binding.md

• Static item binding with AccordionItem elements
• DataSource property and dynamic data binding
• OData service integration with DataManager
• Mapping header and content properties from data
• Handling complex data structures

Advanced Content Loading

📄 Read: references/content-loading.md

• Loading content from partial views
• Lazy loading strategies for performance
• Dynamic content rendering and updates
• POST-based content requests
• Content refresh and state management

Customization & Animation

📄 Read: references/customization-animation.md

• Configuring expand/collapse animations
• Animation settings: effect, duration, easing
• Event handling: expanding, expanded, collapsing, collapsed
• Programmatic expand/collapse with expandItem() method
• Advanced interaction patterns and sequential operations

Nested Accordion Structures

📄 Read: references/nested-accordion.md

• Creating multi-level accordion hierarchies
• Referencing nested accordion elements
• Content element ID references
• Performance considerations at scale

Complete API Reference

📄 Read: api-reference.md

• All properties, methods, and events available
• AccordionItem configuration options
• Animation settings and event arguments
• Non-duplicative reference to skill files for detailed guidance

Quick Start Example

<!-- Add Accordion in your Razor page -->
<div class="control_wrapper accordion-control-section">
    <ejs-accordion id="myAccordion" expand-mode="Multiple">
        <e-accordion-accordionitems>
            <e-accordion-accordionitem expanded="true" 
                header="Getting Started" 
                content="Learn the basics of Accordion component integration">
            </e-accordion-accordionitem>
            <e-accordion-accordionitem 
                header="Features" 
                content="Explore expand modes, data binding, and customization options">
            </e-accordion-accordionitem>
            <e-accordion-accordionitem 
                header="Advanced Topics" 
                content="Discover nested accordions, animations, and event handling">
            </e-accordion-accordionitem>
        </e-accordion-accordionitems>
    </ejs-accordion>
</div>

This creates a basic accordion with three items, the first one expanded by default.

Common Patterns

FAQ Section with Single Expand Mode

Use Single expand mode when only one FAQ answer should be visible at a time:

<ejs-accordion expand-mode="Single">

Documentation with Multiple Panels Open

Use Multiple expand mode (default) to allow readers to compare multiple sections simultaneously.

Dynamic Content Loading

Bind accordion items to a DataSource for dynamic content:

<ejs-accordion data-source="Model.AccordionItems">

Keeping One Panel Always Open

In Single mode, configure the expanding event to prevent the last open item from being collapsed.

Key Properties

Property	Type	Default	Purpose
expandMode	Single | Multiple	Multiple	Controls whether one or multiple items can be expanded simultaneously
items	AccordionItemModel[]	[]	Array of accordion items to display
dataSource	Object[]	[]	Binds dynamic data to accordion items
expandedIndices	number[]	[]	Specifies which items are expanded on initial load
height	string | number	auto	Sets accordion container height
width	string | number	100%	Sets accordion container width
animation	AccordionAnimationSettingsModel	Configured	Customizes expand/collapse animations
enablePersistence	boolean	false	Persists expanded state across page reloads
enableHtmlSanitizer	boolean	true	Sanitizes untrusted HTML content

When to Use Each Expand Mode

Single Mode: Use when content is mutually exclusive or only one section should be visible at once (e.g., step-by-step wizards, radio button-like behavior).

Multiple Mode: Use when users need to view multiple sections simultaneously (e.g., FAQ sections, documentation, feature lists).

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Next Steps: Select a reference file based on your needs, or start with Getting Started for a complete setup walkthrough.