Implementing Syncfusion Blazor FileUpload

This skill covers the Syncfusion Blazor FileUpload component, a robust solution for file handling in Blazor applications. Learn to implement single and multiple file uploads, configure validation rules, enable drag-drop interactions, handle large files with chunked uploads, and leverage comprehensive events for complete upload control and user feedback.

FileUpload

Learn to implement Syncfusion Blazor File Upload component with async/sync uploads, validation, events, customization, and always get immediate file handling with drag-drop or form integration for web and server applications.

Documentation

#### Getting Started 📄 Read: references/file-upload-getting-started.md

• Installation and NuGet package setup
• Visual Studio/Visual Studio Code setup steps
• Blazor WebAssembly vs Server configuration
• Basic SfUploader component rendering
• CSS and script imports
• Minimal working example

#### Core Configuration 📄 Read: references/file-upload-configuration.md

• ID property for component identification
• AllowedExtensions for file type restriction
• AllowMultiple vs single file uploads
• AutoUpload behavior configuration
• SequentialUpload for ordered processing
• DirectoryUpload capability
• Enabled state and component control

#### Upload Methods & Behavior 📄 Read: references/file-upload-file-upload-methods.md

• Synchronous vs asynchronous uploads
• Save URL and Remove URL configuration
• Upload button click handlers
• Automatic vs manual upload triggering
• Upload progress tracking mechanisms
• Backend API requirements

#### Events & Handlers 📄 Read: references/file-upload-events-and-handlers.md

• ValueChange event for direct file access (Blazor Server only, without AsyncSettings)
• FileSelected event for pre-validation
• Created event for initialization logic
• OnFileListRender for custom file display
• OnUploadStart, Success, OnFailure events (use with AsyncSettings)
• Event handler patterns and best practices
• Important: ValueChange and UploaderAsyncSettings are mutually exclusive

#### File Validation 📄 Read: references/file-upload-validation.md

• File type validation strategies
• File size constraints (MinFileSize, MaxFileSize)
• Custom validation functions
• Preventing invalid file uploads
• Error messages and user feedback
• Validation within EditForm

#### Advanced Features 📄 Read: references/file-upload-advanced-features.md

• Chunked upload for large files
• Pause and resume functionality
• Async/await patterns in event handlers
• MemoryStream processing without disk I/O
• Batch upload operations
• Retry and recovery mechanisms

#### Customization & Styling 📄 Read: references/file-upload-customization.md

• Custom file list templates
• CSS class customization
• Theme Studio integration
• Custom button styling
• Dark mode support
• Responsive design patterns

#### File Source Options 📄 Read: references/file-upload-file-source-options.md

• Drag-and-drop upload implementation
• Form integration patterns
• Direct file picker interaction
• Browser file dialog usage
• Directory selection and upload
• Multiple input method combinations
• Accessibility best practices

#### Localization & Accessibility 📄 Read: references/file-upload-localization-accessibility.md

• Multi-language UI support
• Locale configuration options
• Custom text labels
• WCAG 2.1 compliance
• Keyboard navigation implementation
• Screen reader support
• ARIA attributes

#### Platform-Specific Setup 📄 Read: references/file-upload-platform-specific-setup.md

• Blazor WebAssembly app setup
• Blazor Server app setup
• Blazor Web App (.NET 8+) setup
• MAUI integration
• Different render modes
• Platform-specific considerations

Quick Start Example

@using Syncfusion.Blazor.Inputs

<SfUploader AutoUpload="true" AllowedExtensions=".jpg,.jpeg,.png,.pdf">
    <UploaderAsyncSettings 
        SaveUrl="api/upload/save" 
        RemoveUrl="api/upload/remove">
    </UploaderAsyncSettings>
</SfUploader>

Common Patterns

#### Pattern 1: Basic File Upload with Validation (Server Upload)

• Use AutoUpload="true" for instant uploads
• Configure UploaderAsyncSettings with SaveUrl/RemoveUrl
• Set AllowedExtensions to restrict file types
• Listen to FileSelected event for pre-validation
• Use Success/OnFailure events for upload feedback

#### Pattern 2: Direct File Access (Blazor Server Only)

• Use ValueChange event to access file content directly
• Do NOT use UploaderAsyncSettings with ValueChange
• Process files in memory or save to directory
• Best for file preview, Base64 conversion, or direct storage

#### Pattern 3: Multiple File Handling

• Set AllowMultiple="true" to allow batch uploads
• Use SequentialUpload for ordered processing
• Track progress with upload events
• Display file list with individual progress indicators

#### Pattern 4: Large File Upload with Chunking

• Configure ChunkSize in UploaderAsyncSettings
• Enable pause/resume with chunk upload
• Implement retry logic for failed chunks
• Show chunk-level progress to user

Key Props

Common Use Cases

1. Document Upload: Resume, PDF, certification file uploads
2. Image Gallery: User profile pictures, photo collections
3. Data Import: CSV/Excel file imports for data processing
4. Media Library: Video, audio file uploads and management
5. Backup Uploads: Database backups, configuration files
6. Report Generation: Monthly reports, analytics data
7. Invoice Processing: Financial document uploads
8. User Attachments: Email attachments, message files

Quick Decision Tree

User needs file upload functionality ├─ Single file only? → Set AllowMultiple="false" + use basic setup ├─ Multiple files? │ ├─ All at once? → AllowMultiple="true" + SequentialUpload="false" │ └─ One at a time? → AllowMultiple="true" + SequentialUpload="true" └─ Large files (>100MB)? ├─ Enable chunking → Set ChunkSize property └─ Add pause/resume → Listen to Paused and OnResume events

TextArea

Learn to implement Syncfusion Blazor TextArea component for multi-line text input with configurable resize modes, row/column sizing, character limits, floating labels, and comprehensive validation. Perfect for comments, descriptions, messages, and any scenario requiring extended text entry with real-time feedback and form integration.

Documentation

#### Getting Started 📄 Read: references/textarea-getting-started.md

• Installation and NuGet package setup
• Basic SfTextArea component setup
• Namespace imports and service registration
• CSS theme configuration
• Minimal working example
• Initial component rendering

#### Configuration Options 📄 Read: references/textarea-configuration.md

• RowCount and ColumnCount for sizing
• ResizeMode (Vertical, Horizontal, Both, None)
• MaxLength property for character limits
• Placeholder text configuration
• FloatLabelType (Auto, Always, Never)
• ReadOnly and Disabled states
• Width property and responsive sizing
• HTML attributes customization

#### Events and Data Binding 📄 Read: references/textarea-events-binding.md

• Value property and two-way binding (@bind-Value)
• ValueChange event for real-time updates
• Focus and Blur events (TextAreaFocusInEventArgs, TextAreaFocusOutEventArgs)
• Input event for keystroke tracking
• Created and Destroyed lifecycle events
• Form validation integration with EditForm
• ValueExpression for validation binding

#### Customization and Styling 📄 Read: references/textarea-customization.md

• CssClass for custom styling
• ShowClearButton for quick text removal
• InputAttributes and HtmlAttributes
• Theme customization with Theme Studio
• Responsive design patterns
• Accessibility features (ARIA, keyboard navigation)
• RTL (Right-to-Left) support with EnableRtl

Quick Start Example

@using Syncfusion.Blazor.Inputs

<SfTextArea @bind-Value="@description"
            Placeholder="Enter description..."
            RowCount="5"
            ColumnCount="50"
            MaxLength="500"
            FloatLabelType="FloatLabelType.Auto">
</SfTextArea>

@code {
    private string description = "";
}

Common Patterns

#### Pattern 1: Basic Multi-Line Input

• Use RowCount to set visible lines (default: 2)
• Set Placeholder for user guidance
• Enable @bind-Value for two-way binding
• Apply MaxLength for character constraints

#### Pattern 2: Resizable TextArea with Limits

• Set ResizeMode="Resize.Both" for user resizing
• Configure RowCount and ColumnCount for initial size
• Use MaxLength to prevent excessive input
• Listen to ValueChange for live character counting

#### Pattern 3: Form Integration with Validation

• Wrap in <EditForm> with model binding
• Use @bind-Value with ValueExpression
• Apply [Required] or [StringLength] attributes
• Display validation messages with <ValidationMessage>
• Style invalid state with CSS

#### Pattern 4: Auto-Growing TextArea

• Set ResizeMode="Resize.Vertical" for vertical expansion
• Start with minimal RowCount (e.g., 3)
• Allow user to expand as needed
• Combine with MaxLength for upper bounds

Key Props

Common Use Cases

1. Comment Sections: User feedback, review comments, discussion threads
2. Form Descriptions: Product descriptions, bio sections, about fields
3. Message Composition: Email bodies, chat messages, note-taking
4. Code/JSON Input: Configuration files, script input, data entry
5. Address Fields: Multi-line address entry with street, city, etc.
6. Search Queries: Complex search inputs with multiple criteria
7. Customer Support: Ticket descriptions, issue reporting, help requests
8. Content Management: Article drafts, blog post editing, documentation

Quick Decision Tree

User needs multi-line text input ├─ Fixed size? → Set ResizeMode="Resize.None" + specific RowCount ├─ User-resizable? │ ├─ Vertical only? → ResizeMode="Resize.Vertical" │ ├─ Horizontal only? → ResizeMode="Resize.Horizontal" │ └─ Both directions? → ResizeMode="Resize.Both" ├─ Character limit needed? → Set MaxLength property └─ Form validation? ├─ Use within <EditForm> └─ Add ValueExpression for validation binding

Signature

Learn to implement Syncfusion Blazor Signature component for capturing digital signatures with configurable stroke width, colors, background images, save/load functionality in multiple formats (PNG, JPEG, SVG), and comprehensive event handling. Perfect for e-signatures, document approval workflows, digital consent forms, and any scenario requiring handwritten signature capture with touch and mouse support.

Documentation

#### Getting Started 📄 Read: references/signature-getting-started.md

• Installation and NuGet package setup
• Basic SfSignature component setup
• Namespace imports and service registration
• CSS theme configuration
• Canvas rendering and initialization
• Touch and mouse input support
• Minimal working example

#### Drawing Configuration 📄 Read: references/signature-drawing-configuration.md

• MinStrokeWidth and MaxStrokeWidth for pen thickness
• StrokeColor for ink color customization
• BackgroundColor for canvas background
• BackgroundImage for letterhead/watermark
• Velocity property for stroke smoothness
• Drawing behavior and responsiveness
• Pressure sensitivity simulation

#### Save and Load Signatures 📄 Read: references/signature-save-load.md

• Save() method with format options (PNG, JPEG, SVG)
• SaveWithBackground property configuration
• GetSignature() for Base64 string retrieval
• Load() method for existing signatures
• Clear() method for signature removal
• File format selection and quality settings
• Server integration patterns
• Database storage strategies

#### Event Handling 📄 Read: references/signature-events.md

• Changed event for stroke tracking
• OnSave event for save operations
• Created event for initialization
• Event argument structure
• Real-time signature validation
• Detecting empty vs filled signatures
• Event-driven workflows

#### Customization and Styling 📄 Read: references/signature-customization.md

• Disabled and IsReadOnly states
• HtmlAttributes for custom styling
• Canvas size customization
• Theme integration
• Mobile and touch device optimization
• Accessibility considerations
• Responsive design patterns

Quick Start Example

@using Syncfusion.Blazor.Inputs

<div class="signature-container">
    <label>Sign below:</label>
    <SfSignature @ref="signatureRef"
                 StrokeColor="#000000"
                 BackgroundColor="#FFFFFF"
                 MaxStrokeWidth="2.0"
                 MinStrokeWidth="0.5">
    </SfSignature>
    
    <div class="signature-actions">
        <button @onclick="SaveSignature">Save</button>
        <button @onclick="ClearSignature">Clear</button>
    </div>
</div>

@code {
    private SfSignature signatureRef;
    
    private async Task SaveSignature()
    {
        await signatureRef.SaveAsync(SignatureFileType.Png, "signature.png");
    }
    
    private async Task ClearSignature()
    {
        await signatureRef.ClearAsync();
    }
}

Common Patterns

#### Pattern 1: Basic Signature Capture

• Use default stroke settings for natural handwriting feel
• Set BackgroundColor="#FFFFFF" for clear canvas
• Provide Clear button for user corrections
• Save as PNG for universal compatibility
• Validate signature is not empty before submission

#### Pattern 2: Document Signing with Letterhead

• Use BackgroundImage for company letterhead or form template
• Set SaveWithBackground="true" to include background in saved file
• Configure StrokeColor to contrast with background
• Save as PNG or JPEG with background embedded
• Ideal for contracts, agreements, official documents

#### Pattern 3: Mobile-Optimized Signature

• Increase stroke width for better touch visibility
• Use larger canvas size for thumb-friendly drawing
• Set IsReadOnly="false" only when signature mode active
• Auto-save on signature completion
• Provide clear visual feedback for touch interactions

#### Pattern 4: Multi-Signature Forms

• Use multiple SfSignature components for different signatories
• Track completion state per signature field
• Save each signature with unique identifier
• Combine signatures in final document generation
• Validate all required signatures before form submission

Key Props

Common Use Cases

1. E-Signature Capture: Digital document signing, contract approval, consent forms
2. Financial Services: Loan applications, account opening, transaction authorization
3. Healthcare: Patient consent forms, HIPAA agreements, medical records
4. Legal Documents: Contracts, NDAs, legal agreements, court documents
5. HR Processes: Employment contracts, onboarding documents, policy acknowledgments
6. Delivery Confirmation: Package delivery signatures, service completion
7. Check-In Systems: Visitor logs, attendance tracking, registration forms
8. Educational: Test proctoring, form submissions, parent consent

Quick Decision Tree

User needs signature capture ├─ Basic signature? │ └─ Use default settings + Save as PNG ├─ Document with letterhead? │ ├─ Set BackgroundImage property │ └─ Enable SaveWithBackground="true" ├─ Mobile/touch primary? │ ├─ Increase MaxStrokeWidth to 3.0+ │ └─ Use larger canvas dimensions ├─ Multiple signers? │ ├─ Use multiple SfSignature components │ ├─ Track each signature state separately │ └─ Save with unique identifiers └─ Need specific format? ├─ PNG → Universal support, transparency ├─ JPEG → Smaller file size, no transparency └─ SVG → Vector format, scalable

RangeSlider

Learn to implement Syncfusion Blazor Range Slider component with dual handles for range selection, ticks, tooltips, color ranges, movement limits, and always get immediate two-value selection for price filters, date ranges, temperature zones, or any scenario requiring range input with visual feedback and validation in Blazor applications.

Documentation

#### Getting Started 📄 Read: references/rangeslider-getting-started.md

• Installation and NuGet package setup
• Basic SfSlider with Type="SliderType.Range"
• Value binding with arrays for dual handles
• CSS imports and theme configuration
• Namespace imports and service registration
• Minimal working example with range selection

#### Range Configuration 📄 Read: references/rangeslider-range-configuration.md

• Min, Max, and Step properties for range bounds
• Type property (SliderType.Range vs Default)
• Two-way value binding with arrays (@bind-Value)
• Custom non-numeric values with CustomValues
• IsImmediateValue for real-time updates
• Value array structure and data types

#### Ticks and Tooltip 📄 Read: references/rangeslider-ticks-and-tooltip.md

• SliderTicks component configuration
• LargeStep and SmallStep for interval markers
• Tick placement options (Before, After, Both)
• ShowSmallTicks property for granular display
• Format property for tick label customization
• SliderTooltip component setup
• Tooltip visibility modes (Focus, Hover, Always, Auto)
• Tooltip placement and format customization
• Custom tooltip templates

#### Color Ranges and Visual Indication 📄 Read: references/rangeslider-color-ranges-visual.md

• SliderColorRanges for visual feedback
• ColorRange components with Start, End, Color
• Multiple color segments for different value zones
• Use cases (temperature zones, price tiers, ratings)
• Color customization and styling
• Accessibility considerations for color choices

#### Limits and Constraints 📄 Read: references/rangeslider-limits-and-constraints.md

• SliderLimits configuration for movement restrictions
• MinStart, MinEnd, MaxStart, MaxEnd properties
• Enabled property for limit activation
• StartHandleFixed and EndHandleFixed for locked handles
• Restricting handle movement within bounds
• Use cases (booking date ranges, budget constraints)
• Validation patterns with limits

#### Orientation and Customization 📄 Read: references/rangeslider-orientation-and-customization.md

• Orientation property (Horizontal vs Vertical)
• ShowButtons for increment/decrement controls
• Width property for responsive sizing
• EnableAnimation for smooth transitions
• CssClass for custom styling
• EnableRtl for right-to-left language support
• ReadOnly and Enabled states
• Theme customization with Theme Studio

#### Events and Data Binding 📄 Read: references/rangeslider-events-and-binding.md

• SliderEvents component configuration
• ValueChange event callback for range updates
• OnChange vs Changed event timing
• Created event for initialization logic
• Rendered event for post-render operations
• OnTooltipChange for dynamic tooltip content
• OnTicksRender for custom tick label rendering
• Form integration with EditForm
• Validation with EditContext and data annotations

Quick Start Example

@using Syncfusion.Blazor.Inputs

<div class="range-slider-container">
    <label>Select Price Range: $@priceRange[0] - $@priceRange[1]</label>
    <SfSlider @bind-Value="@priceRange"
              Type="SliderType.Range"
              Min="0"
              Max="1000"
              Step="10">
        <SliderTicks Placement="Placement.After" LargeStep="200" SmallStep="50" ShowSmallTicks="true"></SliderTicks>
        <SliderTooltip IsVisible="true" ShowOn="TooltipShowOn.Always" Format="C0"></SliderTooltip>
    </SfSlider>
</div>

@code {
    private int[] priceRange = new int[] { 200, 800 };
}

Common Patterns

#### Pattern 1: Basic Range Selection

• Set Type="SliderType.Range" for dual handles
• Bind value to int[] or double[] array with two elements
• Configure Min, Max, and Step properties
• Enable tooltip with IsVisible="true" for user feedback
• Use ValueChange event to capture range updates

#### Pattern 2: Range with Visual Color Zones

• Add SliderColorRanges component
• Define multiple ColorRange segments (e.g., cold/warm/hot)
• Set colors that provide clear visual distinction
• Use for temperature, ratings, or risk indicators
• Combine with ticks for precise value identification

#### Pattern 3: Constrained Range Selection

• Use SliderLimits to restrict handle movement
• Set MinStart/MaxStart for first handle bounds
• Set MinEnd/MaxEnd for second handle bounds
• Enable StartHandleFixed or EndHandleFixed if one handle should be locked
• Ideal for booking systems, budget planning, scheduling

#### Pattern 4: Custom Value Range Selection

• Use CustomValues array for non-numeric ranges
• Example: string[] { "XS", "S", "M", "L", "XL", "XXL" }
• Value array uses indices, not actual values
• Display custom labels via tick formatting
• Perfect for size selection, priority levels, skill ratings

Key Props

Common Use Cases

1. E-Commerce Price Filters: Min/max price selection, budget range filtering
2. Date Range Pickers: Check-in/check-out dates, event duration, scheduling
3. Temperature Control: HVAC systems, oven settings, climate zones
4. Age Range Selection: Demographics, target audience, age restrictions
5. Time Range Selection: Working hours, availability slots, time windows
6. Score/Rating Ranges: Grade filtering, performance metrics, review scores
7. Financial Planning: Budget allocation, investment ranges, spending limits
8. Resource Allocation: CPU/memory limits, bandwidth throttling, capacity planning

Quick Decision Tree

User needs range selection (two values) ├─ Numeric range? │ ├─ Set Type="SliderType.Range" │ ├─ Use int[] or double[] for Value │ └─ Configure Min, Max, Step ├─ Non-numeric values (sizes, labels)? │ ├─ Set CustomValues array │ ├─ Value array contains indices │ └─ Use tick formatting for labels ├─ Need visual zones? │ ├─ Add SliderColorRanges component │ └─ Define multiple ColorRange segments ├─ Restrict movement? │ ├─ Use SliderLimits component │ ├─ Set MinStart/MaxStart/MinEnd/MaxEnd │ └─ Enable StartHandleFixed or EndHandleFixed if needed ├─ Vertical layout needed? │ └─ Set Orientation="SliderOrientation.Vertical" └─ Real-time updates during drag? └─ Set IsImmediateValue="true"

OtpInput

Learn to implement Syncfusion Blazor OtpInput (One-Time Password) component for secure verification code entry with configurable length, input types (number, text, password), styling modes (outlined, underlined, filled), automatic focus management, and comprehensive event handling. Perfect for 2FA authentication, email verification, SMS codes, PIN entry, and any scenario requiring secure multi-digit code input with keyboard navigation and accessibility support.

Documentation

#### Getting Started 📄 Read: references/otpinput-getting-started.md

• Installation and NuGet package setup
• Basic SfOtpInput component setup
• Namespace imports and service registration
• CSS theme configuration
• Length property for OTP digit count
• Value binding and retrieval
• Minimal working example

#### Configuration Options 📄 Read: references/otpinput-configuration.md

• Length property for digit count (default: 4)
• Type property (Number, Text, Password)
• Placeholder configuration for empty inputs
• Separator for visual grouping
• AutoFocus for immediate input
• Disabled state management
• ID and HtmlAttributes customization

#### Styling Modes 📄 Read: references/otpinput-styling-modes.md

• StylingMode options (Outlined, Underlined, Filled)
• TextTransform (None, Lowercase, Uppercase)
• CssClass for custom styling
• Theme customization with Theme Studio
• Responsive design patterns
• Visual states and focus indicators

#### Events and Data Binding 📄 Read: references/otpinput-events-binding.md

• Value property and two-way binding (@bind-Value)
• ValueChanged event callback (use Value property only, NOT @bind-Value)
• OnInput event with OtpInputEventArgs
• OnFocus and OnBlur events
• Created lifecycle event
• Form validation integration
• Real-time verification patterns
• Auto-submit on completion

#### Accessibility 📄 Read: references/otpinput-accessibility.md

• AriaLabels array for individual input fields
• Keyboard navigation (arrows, backspace, delete)
• Screen reader support
• WCAG 2.1 compliance
• Focus management best practices
• Password type accessibility considerations
• Mobile device optimization

Quick Start Example

@using Syncfusion.Blazor.Inputs

<div class="otp-container">
    <label>Enter verification code:</label>
    <SfOtpInput @bind-Value="@otpValue"
                Length="6"
                Type="OtpInputType.Number"
                StylingMode="OtpInputStyle.Outlined">
    </SfOtpInput>
    
    @if (!string.IsNullOrEmpty(message))
    {
        <div class="message">@message</div>
    }
</div>

@code {
    private string otpValue = "";
    private string message = "";
    
    protected override void OnParametersSet()
    {
        if (otpValue.Length == 6)
        {
            message = "Verifying code...";
            // Call verification API
        }
    }
}

Common Patterns

#### Pattern 1: Basic OTP Verification (6-digit numeric)

• Set Length="6" for standard OTP length
• Use Type="OtpInputType.Number" for numeric-only input
• Enable AutoFocus="true" for immediate input
• Use @bind-Value for two-way binding (simplest approach)
• Validate and verify OTP on server

#### Pattern 2: Email/SMS Verification Code

• Configure Length="4" or Length="6" based on service
• Use Type="OtpInputType.Number" for numeric codes
• Set StylingMode="OtpInputStyle.Underlined" for clean look
• Auto-focus first input on page load
• Show countdown timer for code expiration
• Provide "Resend code" functionality

#### Pattern 3: Secure PIN Entry

• Use Type="OtpInputType.Password" to mask input
• Set Length="4" or Length="6" for PIN length
• Apply StylingMode="OtpInputStyle.Filled" for modern look
• Implement rate limiting for security
• Clear input on failed attempts
• Show visual feedback for validation

#### Pattern 4: Alphanumeric Verification (with separators)

• Set Type="OtpInputType.Text" for letters and numbers
• Use TextTransform="TextTransform.Uppercase" for readability
• Configure Separator="-" to visually group digits
• Example: ABC-123-XYZ pattern
• Set Length="9" (including separator positions)
• Useful for activation codes, license keys

Key Props

Common Use Cases

1. Two-Factor Authentication (2FA): Login security, account verification, multi-factor authentication
2. Email Verification: Account activation, email confirmation, newsletter signup
3. SMS Verification: Phone number verification, mobile app login, transaction confirmation
4. Password Reset: Secure password recovery, account access restoration
5. Transaction Verification: Banking transactions, payment confirmation, fund transfers
6. Access Control: Building entry codes, secure area access, temporary access codes
7. Device Pairing: Bluetooth pairing codes, smart device setup, IoT device linking
8. Activation Codes: Software licenses, product activation, subscription validation

Quick Decision Tree

User needs OTP/verification code input ├─ Numeric only? │ ├─ Set Type="OtpInputType.Number" │ └─ Use Length="4" or Length="6" ├─ Need to hide input (PIN)? │ ├─ Set Type="OtpInputType.Password" │ └─ Apply security best practices ├─ Alphanumeric codes? │ ├─ Set Type="OtpInputType.Text" │ ├─ Use TextTransform="TextTransform.Uppercase" │ └─ Consider Separator for readability ├─ Auto-submit when complete? │ ├─ Listen to ValueChanged event │ ├─ Check if value.Length == Length │ └─ Call verification API automatically ├─ Custom styling needed? │ ├─ Outlined → StylingMode="OtpInputStyle.Outlined" (default) │ ├─ Underlined → StylingMode="OtpInputStyle.Underlined" │ └─ Filled → StylingMode="OtpInputStyle.Filled" └─ Accessibility important? ├─ Set AriaLabels array for screen readers └─ Enable AutoFocus for keyboard users

Rating

Learn to implement Syncfusion Blazor Rating component for intuitive rating and feedback collection with configurable precision modes (full, half, quarter, exact), custom icons and templates, label and tooltip support, comprehensive event handling, and accessibility features. Perfect for product reviews, skill assessments, satisfaction surveys, quality ratings, and any scenario requiring user feedback through star ratings or custom iconography with keyboard navigation and form integration.

Documentation

#### Getting Started 📄 Read: references/rating-getting-started.md

• Installation and NuGet package setup
• Basic SfRating component setup
• Namespace imports and service registration
• CSS theme configuration
• ItemsCount property for rating scale
• Value binding and retrieval
• Minimal working example
• Basic 5-star rating implementation

#### Precision and Values 📄 Read: references/rating-precision-and-values.md

• Precision property (Full, Half, Quarter, Exact)
• Full precision for whole numbers only
• Half precision for 0.5 increments
• Quarter precision for 0.25 increments
• Exact precision for decimal values
• Min property for minimum rating value
• AllowReset for clearing ratings
• EnableSingleSelection for single-item mode
• Value calculations and display

#### Labels and Tooltips 📄 Read: references/rating-labels-and-tooltips.md

• ShowLabel property for label display
• LabelPosition (Top, Bottom, Left, Right)
• LabelTemplate for custom label formatting
• ShowTooltip property for hover tooltips
• TooltipTemplate for custom tooltip content
• Dynamic label updates based on value
• Contextual feedback patterns

#### Templates and Customization 📄 Read: references/rating-templates-customization.md

• EmptyTemplate for unselected items
• FullTemplate for selected items
• RatingItemContext for template data
• Custom icon implementation (hearts, thumbs, emojis)
• SVG and icon font integration
• CssClass for custom styling
• EnableAnimation property
• Theme customization and responsive design

#### Events and States 📄 Read: references/rating-events-and-states.md

• ValueChanged event for rating updates
• OnItemHover event with RatingHoverEventArgs
• Created lifecycle event
• Form validation integration
• ReadOnly state for display-only ratings
• Disabled state management
• Visible property control
• Keyboard navigation support
• Accessibility features and ARIA attributes

Quick Start Example

@using Syncfusion.Blazor.Inputs

<div class="rating-container">
    <label>Rate your experience:</label>
    <SfRating @bind-Value="@userRating"
              ItemsCount="5"
              Precision="PrecisionType.Full"
              ShowLabel="true">
    </SfRating>
    
    @if (userRating > 0)
    {
        <p>You rated: @userRating / 5 stars</p>
    }
</div>

@code {
    private double userRating = 0;
}

Common Patterns

#### Pattern 1: Basic 5-Star Product Rating

• Use default ItemsCount="5" for standard rating
• Set Precision="PrecisionType.Full" for whole stars only
• Enable @bind-Value for two-way data binding
• Show ShowLabel="true" to display rating value
• Position label with LabelPosition="LabelPosition.Right"
• Use ValueChanged event for auto-submit

#### Pattern 2: Half-Star Rating with Hover Feedback

• Set Precision="PrecisionType.Half" for 0.5 increments
• Enable ShowTooltip="true" for hover feedback
• Use OnItemHover event for preview
• Display average ratings with ReadOnly="true"
• Show rating count in custom label template
• Implement real-time feedback messages

#### Pattern 3: Custom Icon Templates (Hearts, Thumbs, Emojis)

• Define EmptyTemplate for unselected state
• Define FullTemplate for selected state
• Use RatingItemContext for item-specific rendering
• Implement custom icons (♥, 👍, 😊, etc.)
• Apply CssClass for custom colors and sizing
• Enable EnableAnimation="true" for smooth transitions

#### Pattern 4: Multi-Category Rating Form

• Create multiple SfRating components
• Different ItemsCount per category if needed
• Combine with EditForm for validation
• Calculate overall rating average
• Track completion with event handlers
• Enable submit only when all ratings complete

Key Props

Common Use Cases

1. Product Reviews: E-commerce ratings, marketplace feedback, customer reviews, product quality assessment
2. Service Quality: Restaurant ratings, hotel reviews, delivery service feedback, support satisfaction
3. Skill Assessments: Employee evaluations, competency ratings, training feedback, proficiency levels
4. Content Rating: Article feedback, video ratings, course reviews, documentation usefulness
5. User Experience: App store ratings, feature satisfaction, usability scores, NPS surveys
6. Performance Reviews: Team member evaluations, project ratings, goal achievements, KPI tracking
7. Survey Responses: Satisfaction surveys, opinion polls, feedback forms, questionnaires
8. Quality Control: Inspection ratings, compliance scoring, audit results, quality metrics
9. Entertainment: Movie ratings, music reviews, book ratings, game scores
10. Sentiment Analysis: Customer sentiment, brand perception, mood tracking, emotional feedback

Quick Decision Tree

User needs rating/feedback functionality ├─ Display existing rating (read-only)? │ ├─ Set ReadOnly="true" │ ├─ Use Precision="PrecisionType.Exact" for average ratings │ └─ Show ShowLabel="true" with review count ├─ Collect new rating from user? │ ├─ Whole stars only? → Precision="PrecisionType.Full" │ ├─ Half stars? → Precision="PrecisionType.Half" │ ├─ Quarter stars? → Precision="PrecisionType.Quarter" │ └─ Any decimal? → Precision="PrecisionType.Exact" ├─ Custom rating scale? │ ├─ 3-point scale → ItemsCount="3" │ ├─ 7-point scale → ItemsCount="7" │ └─ 10-point scale → ItemsCount="10" ├─ Need custom icons instead of stars? │ ├─ Hearts → Define EmptyTemplate and FullTemplate with ♥ │ ├─ Thumbs → Use 👍/👎 icons │ ├─ Emojis → Use 😞😐🙂😊🤩 progression │ └─ Custom SVG → Render SVG in templates ├─ Thumbs up/down only? │ ├─ Set EnableSingleSelection="true" │ ├─ Use ItemsCount="1" or ItemsCount="2" │ └─ Custom templates with thumb icons ├─ Form integration needed? │ ├─ Use within <EditForm> │ ├─ Add validation attributes │ └─ Listen to ValueChanged for validation ├─ Show rating feedback? │ ├─ Enable ShowLabel="true" for numeric display │ ├─ Use LabelTemplate for custom messages │ ├─ Enable ShowTooltip="true" for hover feedback │ └─ Use TooltipTemplate for contextual messages └─ Accessibility requirements? ├─ Ensure keyboard navigation works (arrow keys) ├─ Test screen reader compatibility └─ Provide clear ARIA labels

InputMask

Learn to implement Syncfusion Blazor InputMask (MaskedTextBox) component for formatted text input with predefined patterns, custom mask rules, prompt characters, and always get immediate masked input for phone numbers, SSN, credit cards, dates, ZIP codes, license plates, or any scenario requiring structured text entry with format validation, literal preservation, and comprehensive event handling in Blazor applications.

Documentation

#### Getting Started 📄 Read: references/inputmask-getting-started.md

• Installation and NuGet package setup
• Basic SfMaskedTextBox component setup
• Namespace imports and service registration
• CSS theme configuration
• Simple mask examples (phone, date, SSN)
• Value binding basics
• Minimal working example

#### Mask Patterns and Configuration 📄 Read: references/inputmask-mask-patterns.md

• Standard mask characters (0, 9, L, ?, A, &, C, #)
• Predefined patterns (phone, SSN, ZIP, date, time)
• Mask property configuration
• Literal characters in masks
• Optional vs required positions
• Complex pattern examples
• International format patterns
• Pattern validation rules

#### Custom Characters and Formatting 📄 Read: references/inputmask-custom-characters.md

• CustomCharacters dictionary usage
• Creating custom mask rules
• Regex-based character validation
• Advanced pattern customization
• Use cases (license plates, product codes, etc.)
• Combining custom with standard masks
• Best practices for custom rules

#### Prompt Character Configuration 📄 Read: references/inputmask-prompt-configuration.md

• PromptChar property (default: _)
• PromptPlaceholder for display
• EnableLiterals for value inclusion
• Placeholder vs PromptChar difference
• Visual feedback configuration
• User experience considerations
• Examples with different configurations

#### Events and Data Binding 📄 Read: references/inputmask-events-binding.md

• Value property and @bind-Value
• ValueChange event (MaskChangeEventArgs)
• ValueChanged event callback
• Focus and Blur events (MaskFocusEventArgs, MaskBlurEventArgs)
• OnChange vs OnInput vs ValueChange timing
• EditForm integration with EditContext
• ValueExpression for validation
• Real-time validation patterns
• Event handler best practices

#### Styling and Accessibility 📄 Read: references/inputmask-styling-accessibility.md

• FloatLabelType configuration
• ShowClearButton functionality
• CssClass for custom styling
• Width and responsive sizing
• Enabled vs Readonly states
• Theme customization with Theme Studio
• WCAG 2.1 compliance
• Keyboard navigation
• ARIA attributes
• Screen reader support
• RTL (EnableRtl) support
• HtmlAttributes and InputAttributes
• Accessibility best practices

Quick Start Example

@using Syncfusion.Blazor.Inputs

<div class="input-mask-container">
    <label>Phone Number:</label>
    <SfMaskedTextBox @bind-Value="@phoneNumber"
                     Mask="(000) 000-0000"
                     Placeholder="Enter phone number"
                     FloatLabelType="FloatLabelType.Auto">
    </SfMaskedTextBox>
    
    <label>Social Security Number:</label>
    <SfMaskedTextBox @bind-Value="@ssn"
                     Mask="000-00-0000"
                     PromptChar="#"
                     Placeholder="Enter SSN">
    </SfMaskedTextBox>
</div>

@code {
    private string phoneNumber = "";
    private string ssn = "";
}

Common Patterns

#### Pattern 1: Phone Number Input (US Format)

• Use mask "(000) 000-0000" for US phone numbers
• Set PromptChar="_" for clear visual feedback
• Enable @bind-Value for two-way binding
• Use FloatLabelType.Auto for modern UX
• Configure Placeholder for user guidance
• Set EnableLiterals="false" to exclude parentheses/dashes from value

#### Pattern 2: Social Security Number (SSN)

• Use mask "000-00-0000" for SSN format
• Set PromptChar="#" or PromptChar="*" for privacy
• Apply Readonly="false" for input, Readonly="true" for display
• Use ShowClearButton="true" for quick reset
• Implement validation with ValueChange event
• Consider masking display value for security

#### Pattern 3: Credit Card Number with Separators

• Use mask "0000 0000 0000 0000" for 16-digit cards
• Set EnableLiterals="false" to get digits only
• Listen to ValueChange to detect card type (Visa, MC, Amex)
• Show card brand icon based on first digits
• Apply real-time Luhn algorithm validation
• Use PromptChar="X" for clear empty positions

#### Pattern 4: Date Input with Custom Format

• Use mask "00/00/0000" for MM/DD/YYYY format
• Or "00-00-0000" for DD-MM-YYYY format
• Set Placeholder="MM/DD/YYYY" for format guidance
• Implement custom validation for valid dates
• Use ValueChange to validate day/month ranges
• Consider using DatePicker component for complex date selection

#### Pattern 5: Custom Product Code Format

• Define CustomCharacters dictionary for special rules
• Example: @(new Dictionary<string, string> { { "P", "[A-Z]" }, { "N", "[0-9]" } })
• Use mask like "PPP-NNN-NNN" for ABC-123-456 format
• Combine standard and custom characters
• Apply TextTransform for uppercase conversion
• Validate against business rules in events

#### Pattern 6: International Phone with Custom Characters

• Use CustomCharacters for country-specific patterns
• Example: "+00 (000) 000-0000" with country code
• Set EnableLiterals="true" to include + and formatting
• Display country flag based on code
• Implement dynamic mask switching per country
• Support multiple international formats

Key Props

Common Use Cases

1. Contact Information: Phone numbers, fax numbers, mobile numbers with country codes
2. Personal Identification: SSN, tax ID, national ID, passport numbers, driver's license
3. Financial Data: Credit card numbers, bank account numbers, routing numbers, CVV codes
4. Dates and Times: Custom date formats, time entry, date ranges with specific patterns
5. Postal Codes: ZIP codes (US), postal codes (international), area codes with formatting
6. Product Identification: SKU numbers, serial numbers, product codes, barcode entry
7. License Numbers: Vehicle plates, software licenses, registration numbers with patterns
8. Network Information: IP addresses, MAC addresses, subnet masks with dot notation
9. Version Numbers: Software versions (1.2.3), build numbers with custom formats
10. Custom Codes: Voucher codes, promo codes, tracking numbers with specific patterns

Quick Decision Tree

User needs formatted text input with pattern ├─ Standard formats? │ ├─ US Phone → Mask="(000) 000-0000" │ ├─ SSN → Mask="000-00-0000" │ ├─ ZIP Code → Mask="00000" or Mask="00000-0000" │ ├─ Credit Card → Mask="0000 0000 0000 0000" │ ├─ Date → Mask="00/00/0000" (MM/DD/YYYY) │ └─ Time → Mask="00:00" (HH:MM) ├─ Need digits only in value? │ ├─ Set EnableLiterals="false" │ └─ Mask literals will be excluded from Value ├─ Include formatting in value? │ ├─ Set EnableLiterals="true" (default) │ └─ Value will include parentheses, dashes, etc. ├─ Custom pattern (not standard)? │ ├─ Use CustomCharacters dictionary │ ├─ Define regex for each custom character │ ├─ Example: { "P", "[A-Z]" } for uppercase letters │ └─ Combine in mask: "PPP-000-NNN" ├─ Privacy/security concerns? │ ├─ Set PromptChar="*" or PromptChar="#" │ ├─ Use Readonly="true" for display-only masked data │ └─ Implement additional masking on display if needed ├─ International format support? │ ├─ Use CustomCharacters for flexible patterns │ ├─ Implement dynamic mask switching based on locale │ └─ Consider country/region selection ├─ Form validation needed? │ ├─ Use within <EditForm> with model binding │ ├─ Add ValueExpression for validation │ ├─ Apply data annotations ([Required], [StringLength]) │ ├─ Listen to ValueChange for real-time validation │ └─ Implement custom validation logic (Luhn, date ranges) ├─ Enhance user experience? │ ├─ Set FloatLabelType="FloatLabelType.Auto" │ ├─ Enable ShowClearButton="true" for quick reset │ ├─ Use meaningful Placeholder text │ └─ Provide visual feedback on validation └─ Accessibility important? ├─ Ensure keyboard navigation works ├─ Set proper ARIA labels via HtmlAttributes ├─ Test screen reader compatibility └─ Provide clear format instructions in label/placeholder

ColorPicker

Learn to implement Syncfusion Blazor ColorPicker component for intuitive color selection with picker and palette modes, opacity control, preset color collections, inline or popup display, mode switching, and always get immediate color input for themes, UI customization, design tools, data visualization, branding, or any scenario requiring color selection with hex/rgba values, recent colors tracking, and comprehensive event handling in Blazor applications.

Documentation

#### Getting Started 📄 Read: references/colorpicker-getting-started.md

• Installation and NuGet package setup
• Basic SfColorPicker component setup
• Namespace imports and service registration
• CSS theme configuration
• Value binding with color formats
• Mode overview (Picker vs Palette)
• Minimal working example

#### Modes and Configuration 📄 Read: references/colorpicker-modes-configuration.md

• ColorPickerMode (Picker vs Palette)
• Picker mode for gradient color selection
• Palette mode for predefined color grids
• Inline vs Popup display options
• ModeSwitcher for user mode selection
• Columns configuration for palette layout
• ShowButtons for Apply/Cancel actions
• Mode-specific behaviors and use cases

#### Preset Colors and Palettes 📄 Read: references/colorpicker-presets-colors.md

• PresetColors dictionary configuration
• Custom color palette groups
• Default preset color collections
• ShowRecentColors functionality
• NoColor option for "no selection"
• Organizing preset categories
• Business and design use cases

#### Opacity and Value Formats 📄 Read: references/colorpicker-opacity-values.md

• EnableOpacity for alpha channel control
• Opacity slider configuration
• Value formats (hex, rgba, hsva)
• Reading and setting opacity values
• Transparent color handling
• Use cases (overlays, highlights, transparency)

#### Events and Data Binding 📄 Read: references/colorpicker-events-binding.md

• Value property and two-way binding (@bind-Value)
• ValueChanged event callback
• Selected event with ColorPickerEventArgs
• OnOpen and OnClose events for popup control
• ModeSwitched event handling
• OnTileRender for custom palette tiles
• Form integration with EditForm
• Real-time color preview patterns

#### Customization and Accessibility 📄 Read: references/colorpicker-customization-accessibility.md

• ShowButtons configuration
• CssClass for custom styling
• Disabled and EnableRtl states
• HtmlAttributes customization
• Keyboard navigation support
• ARIA attributes for accessibility
• WCAG 2.1 compliance
• Theme customization with Theme Studio
• Responsive design patterns

Quick Start Example

@using Syncfusion.Blazor.Inputs

<div class="colorpicker-container">
    <label>Choose a color:</label>
    <SfColorPicker @bind-Value="@selectedColor"
                   Mode="ColorPickerMode.Palette"
                   ShowButtons="true">
    </SfColorPicker>
    
    <div class="color-preview" style="background-color: @selectedColor;">
        Selected: @selectedColor
    </div>
</div>

@code {
    private string selectedColor = "#008000";
}

Common Patterns

#### Pattern 1: Basic Palette Color Picker

• Use Mode="ColorPickerMode.Palette" for predefined color grid
• Enable @bind-Value for two-way binding
• Set ShowButtons="true" for Apply/Cancel actions
• Use default PresetColors or customize
• Bind to string variable for hex values
• Display preview with selected color

#### Pattern 2: Advanced Gradient Picker with Opacity

• Set Mode="ColorPickerMode.Picker" for gradient selector
• Enable EnableOpacity="true" for alpha channel
• Use ModeSwitcher="true" to allow mode switching
• Display rgba value for transparency
• Ideal for design tools, graphics editors
• Show real-time preview with opacity

#### Pattern 3: Inline Color Selector (No Popup)

• Set Inline="true" for always-visible picker
• Use for color customization panels
• No popup trigger, immediate display
• Works with both Picker and Palette modes
• Combine with ShowButtons="false" for instant selection
• Perfect for settings panels, theme builders

#### Pattern 4: Custom Preset Palette

• Define PresetColors dictionary with custom groups
• Organize by categories (brand colors, pastels, etc.)
• Set Columns property for grid layout
• Use ShowRecentColors="true" for history
• Enable NoColor="true" for "no selection" option
• Ideal for brand color systems, design systems

Key Props

Common Use Cases

1. UI Theme Customization: User-selectable themes, color scheme builders, personalization
2. Design Tools: Graphic editors, drawing apps, image annotation, markup tools
3. Data Visualization: Chart color selection, graph customization, report styling
4. Branding: Logo colors, brand identity, style guide implementation, corporate colors
5. Web Design: CSS color selection, background colors, text colors, border colors
6. Product Customization: Product color variants, custom merchandise, personalization
7. Highlighting Tools: Text highlighters, annotation colors, emphasis markers
8. Dashboard Customization: Widget colors, status indicators, category colors
9. Form Builders: Custom form styling, input colors, validation colors
10. Calendar/Scheduling: Event colors, category coding, priority indicators

Quick Decision Tree

User needs color selection functionality ├─ Specific predefined colors only? │ ├─ Use Mode="ColorPickerMode.Palette" │ ├─ Set PresetColors with custom palette │ └─ Configure Columns for grid layout ├─ Any color from gradient? │ ├─ Use Mode="ColorPickerMode.Picker" (default) │ └─ Users can select from full color spectrum ├─ Allow both modes? │ ├─ Enable ModeSwitcher="true" │ └─ Users can toggle between Picker and Palette ├─ Need transparency/opacity? │ ├─ Set EnableOpacity="true" │ ├─ Value will include alpha (rgba format) │ └─ Show opacity slider for user control ├─ Always visible (no popup)? │ ├─ Set Inline="true" │ ├─ Use in settings panels, sidebars │ └─ Consider ShowButtons="false" for instant selection ├─ Popup with confirmation? │ ├─ Use Inline="false" (default) │ ├─ Set ShowButtons="true" for Apply/Cancel │ └─ Listen to Selected event for confirmed selection ├─ Track recent colors? │ ├─ Enable ShowRecentColors="true" (default) │ └─ Recent colors displayed automatically ├─ Allow "no color" selection? │ ├─ Set NoColor="true" │ └─ User can clear color selection ├─ Custom color palette needed? │ ├─ Define PresetColors dictionary │ ├─ Group colors by category │ └─ Example: { "Basic": ["#fff", "#000"], "Brand": ["#e74c3c", "#3498db"] } ├─ Form integration required? │ ├─ Use within <EditForm> │ ├─ Apply validation attributes │ └─ Listen to ValueChanged for validation └─ Accessibility important? ├─ Ensure keyboard navigation works (Tab, Enter, Escape) ├─ Test screen reader compatibility └─ Provide clear labels via HtmlAttributes