Customization

CommandForm provides several customization options to adapt the form rendering to your specific needs while maintaining integration with the command system.

Custom Titles

By default, CommandForm displays field titles above each field when they are defined. You can disable automatic title rendering and provide your own custom title rendering.

Disabling Automatic Titles

Set the showTitles prop to false:

<CommandForm command={MyCommand} showTitles={false}>
    <InputTextField<MyCommand> value={c => c.name} title="Full Name" />
    <InputTextField<MyCommand> value={c => c.email} type="email" title="Email Address" />
</CommandForm>

Custom Title Rendering

Combine showTitles={false} with custom heading or label elements:

<CommandForm command={MyCommand} showTitles={false}>
    <h3 style={{ fontSize: '1.25rem', fontWeight: 'bold', marginBottom: '0.5rem' }}>
        Full Name
    </h3>
    <InputTextField<MyCommand> value={c => c.name} title="Full Name" />

    <h3 style={{ fontSize: '1.25rem', fontWeight: 'bold', marginBottom: '0.5rem', marginTop: '1rem' }}>
        Email Address
    </h3>
    <InputTextField<MyCommand> value={c => c.email} type="email" title="Email Address" />
</CommandForm>

Use Case

Custom titles are useful when you want:

• Different visual styling than the default
• To include additional information (icons, tooltips, required indicators)
• More control over layout and spacing
• To use a custom design system

Custom Error Rendering

CommandForm automatically displays error messages below fields when validation fails. You can take control of error rendering to match your design requirements.

Disabling Automatic Error Messages

Set the showErrors prop to false:

<CommandForm command={MyCommand} showErrors={false}>
    <InputTextField<MyCommand> value={c => c.email} type="email" title="Email" required />
    <InputTextField<MyCommand> value={c => c.password} type="password" title="Password" required />
</CommandForm>

Custom Error Display

Use the useCommandFormContext hook to access validation state and render errors yourself:

import { useCommandFormContext } from '@cratis/arc.react/commands';

function MyForm() {
    const { getFieldError } = useCommandFormContext();
    const emailError = getFieldError('email');
    const passwordError = getFieldError('password');

    return (
        <CommandForm command={MyCommand} showErrors={false}>
            <InputTextField<MyCommand> value={c => c.email} type="email" title="Email" required />
            {emailError && (
                <div className="error-message" style={{
                    backgroundColor: '#fee',
                    color: '#c00',
                    padding: '0.5rem',
                    borderRadius: '0.25rem',
                    marginTop: '0.25rem',
                    fontSize: '0.875rem'
                }}>
                    ⚠️ {emailError}
                </div>
            )}

            <InputTextField<MyCommand> value={c => c.password} type="password" title="Password" required />
            {passwordError && (
                <div className="error-message">
                    ⚠️ {passwordError}
                </div>
            )}
        </CommandForm>
    );
}

Error Summary

Display all errors at once at the top or bottom of the form:

function MyForm() {
    const { commandResult } = useCommandFormContext();
    const hasErrors = commandResult?.validationResults && commandResult.validationResults.length > 0;

    return (
        <CommandForm command={MyCommand} showErrors={false}>
            {hasErrors && (
                <div className="error-summary" style={{
                    backgroundColor: '#fee',
                    border: '2px solid #c00',
                    padding: '1rem',
                    borderRadius: '0.5rem',
                    marginBottom: '1rem'
                }}>
                    <h4 style={{ margin: '0 0 0.5rem 0', color: '#c00' }}>
                        Please correct the following errors:
                    </h4>
                    <ul style={{ margin: 0, paddingLeft: '1.5rem' }}>
                        {Object.entries(instance.errors).map(([field, errors]) => (
                            <li key={field} style={{ color: '#c00' }}>
                                <strong>{field}:</strong> {errors.join(', ')}
                            </li>
                        ))}
                    </ul>
                </div>
            )}

            <InputTextField<MyCommand> value={c => c.email} type="email" title="Email" required />
            <InputTextField<MyCommand> value={c => c.password} type="password" title="Password" required />
        </CommandForm>
    );
}

Use Case

Custom error rendering is useful when you want:

• Error summaries at the form level
• Integration with a specific UI framework or design system
• Inline errors with custom icons or animations
• Accessible error messages with specific ARIA attributes

Custom Field Container

For complete control over how each field is rendered, including its title, error message, and container, use the fieldContainerComponent prop.

Using Custom Field Container

Define a custom container component that receives field metadata:

import { FieldContainerProps } from '@cratis/arc.react/commands';

const CustomFieldContainer = ({ title, errorMessage, children }: FieldContainerProps) => (
    <div className="custom-field-container" style={{
        backgroundColor: errorMessage ? '#fff5f5' : '#f9fafb',
        border: `2px solid ${errorMessage ? '#f56565' : '#e5e7eb'}`,
        borderRadius: '0.5rem',
        padding: '1rem',
        marginBottom: '1rem'
    }}>
        {title && (
            <label style={{
                display: 'block',
                fontWeight: 600,
                fontSize: '0.875rem',
                marginBottom: '0.5rem',
                color: errorMessage ? '#c53030' : '#374151'
            }}>
                {title}
                {errorMessage && ' *'}
            </label>
        )}

        {children}

        {errorMessage && (
            <div style={{
                color: '#c53030',
                fontSize: '0.875rem',
                marginTop: '0.5rem',
                fontWeight: 500
            }}>
                🚫 {errorMessage}
            </div>
        )}
    </div>
);

Then use it with CommandForm:

<CommandForm
    command={MyCommand}
    fieldContainerComponent={CustomFieldContainer}
>
    <InputTextField<MyCommand> value={c => c.name} title="Full Name" required />
    <InputTextField<MyCommand> value={c => c.email} type="email" title="Email Address" required />
    <TextAreaField<MyCommand> value={c => c.bio} title="Biography" rows={5} />
</CommandForm>

FieldContainerProps Interface

The custom field container component receives these props:

Prop	Type	Description
title	string | undefined	The field title (from the field’s title prop).
errorMessage	string | undefined	The error message for the field, if any.
children	React.ReactNode	The actual field component.

Advanced Field Container

Add additional features like help text, icons, or required indicators:

interface ExtendedFieldContainerProps extends FieldContainerProps {
    helpText?: string;
    icon?: React.ReactNode;
}

const AdvancedFieldContainer = ({
    title,
    errorMessage,
    children,
    helpText,
    icon
}: ExtendedFieldContainerProps) => (
    <div className="field-wrapper" style={{
        marginBottom: '1.5rem'
    }}>
        {title && (
            <div style={{ display: 'flex', alignItems: 'center', marginBottom: '0.5rem' }}>
                {icon && <span style={{ marginRight: '0.5rem' }}>{icon}</span>}
                <label style={{ fontWeight: 600 }}>
                    {title}
                </label>
            </div>
        )}

        {children}

        {helpText && !errorMessage && (
            <div style={{
                fontSize: '0.875rem',
                color: '#6b7280',
                marginTop: '0.25rem'
            }}>
                ℹ️ {helpText}
            </div>
        )}

        {errorMessage && (
            <div style={{
                fontSize: '0.875rem',
                color: '#dc2626',
                marginTop: '0.25rem',
                fontWeight: 500
            }}>
                ❌ {errorMessage}
            </div>
        )}
    </div>
);

Use Case

Custom field containers are useful when you want:

• Consistent field styling across your application
• Integration with an existing component library
• Complex layouts with icons, help text, and labels
• Conditional styling based on validation state
• Accessibility enhancements (ARIA attributes, screen reader support)

Custom Field Decorator

The fieldDecoratorComponent allows you to customize how fields with icons and descriptions are wrapped and decorated. This is particularly useful for integrating with UI frameworks like PrimeReact, Material-UI, or custom design systems.

Using Custom Field Decorator

Define a custom decorator component:

import { FieldDecoratorProps } from '@cratis/arc.react/commands';

const PrimeReactFieldDecorator = ({ icon, description, children }: FieldDecoratorProps) => {
    if (!icon && !description) {
        return <>{children}</>;
    }

    return (
        <div className="p-inputgroup">
            {icon && (
                <span className="p-inputgroup-addon">
                    {icon}
                </span>
            )}
            <div className="p-field" data-pr-tooltip={description}>
                {children}
            </div>
        </div>
    );
};

Use it with CommandForm:

<CommandForm
    command={MyCommand}
    fieldDecoratorComponent={PrimeReactFieldDecorator}
>
    <InputTextField<MyCommand>
        value={c => c.email}
        title="Email"
        icon={<i className="pi pi-envelope" />}
        description="We'll never share your email"
    />
</CommandForm>

FieldDecoratorProps Interface

Prop	Type	Description
icon	React.ReactElement | undefined	Icon element to display alongside the field.
description	string | undefined	Description text to show as tooltip or help text.
children	React.ReactNode	The field component to decorate.

Custom Error Display

The errorDisplayComponent allows complete control over how validation errors are rendered for each field.

Using Custom Error Display

Define a custom error display component:

import { ErrorDisplayProps } from '@cratis/arc.react/commands';

const CustomErrorDisplay = ({ errors, fieldName }: ErrorDisplayProps) => (
    <div className="custom-errors" role="alert" aria-live="polite">
        {errors.map((error, idx) => (
            <div key={idx} className="error-item" style={{
                display: 'flex',
                alignItems: 'center',
                gap: '0.5rem',
                padding: '0.5rem',
                backgroundColor: '#fef2f2',
                border: '1px solid #fecaca',
                borderRadius: '0.25rem',
                marginTop: '0.25rem',
                fontSize: '0.875rem',
                color: '#dc2626'
            }}>
                <svg width="16" height="16" viewBox="0 0 16 16" fill="currentColor">
                    <path fillRule="evenodd" d="M8 16A8 8 0 1 0 8 0a8 8 0 0 0 0 16zM7 5a1 1 0 1 1 2 0v4a1 1 0 1 1-2 0V5zm1 7a1 1 0 1 0 0-2 1 1 0 0 0 0 2z" />
                </svg>
                <span>{error}</span>
            </div>
        ))}
    </div>
);

Use it with CommandForm:

<CommandForm
    command={MyCommand}
    errorDisplayComponent={CustomErrorDisplay}
>
    <InputTextField<MyCommand> value={c => c.email} title="Email" required />
    <InputTextField<MyCommand> value={c => c.password} title="Password" required />
</CommandForm>

ErrorDisplayProps Interface

Prop	Type	Description
errors	string[]	Array of error messages for the field.
fieldName	string | undefined	Name of the field with errors (useful for custom error handling).

Custom Tooltip Component

The tooltipComponent allows you to integrate custom tooltip libraries or components for field descriptions.

Using Custom Tooltip

Define a custom tooltip wrapper:

import { TooltipWrapperProps } from '@cratis/arc.react/commands';
import { Tooltip } from 'primereact/tooltip';

const PrimeReactTooltip = ({ description, children }: TooltipWrapperProps) => {
    const tooltipId = `tooltip-${Math.random().toString(36).substr(2, 9)}`;

    return (
        <>
            <div data-pr-tooltip={description} data-pr-position="top" id={tooltipId}>
                {children}
            </div>
            <Tooltip target={`#${tooltipId}`} />
        </>
    );
};

Use it with CommandForm:

<CommandForm
    command={MyCommand}
    tooltipComponent={PrimeReactTooltip}
>
    <InputTextField<MyCommand>
        value={c => c.username}
        title="Username"
        description="Choose a unique username. Letters, numbers, and underscores only."
    />
</CommandForm>

TooltipWrapperProps Interface

Prop	Type	Description
description	string	The tooltip text to display.
children	React.ReactNode	The content to attach the tooltip to.

Custom CSS Classes

For lightweight customization without creating custom components, use the CSS class customization options.

Using Custom CSS Classes

<CommandForm
    command={MyCommand}
    errorClassName="my-error-message"
    iconAddonClassName="my-icon-addon"
>
    <InputTextField<MyCommand>
        value={c => c.email}
        title="Email"
        icon={<span>📧</span>}
        required
    />
</CommandForm>

Then define your CSS:

.my-error-message {
    display: block;
    margin-top: 0.5rem;
    padding: 0.5rem;
    background-color: #fee;
    border-left: 3px solid #c00;
    color: #c00;
    font-size: 0.875rem;
    font-weight: 500;
}

.my-icon-addon {
    display: flex;
    align-items: center;
    padding: 0.75rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 0.5rem 0 0 0.5rem;
}

CSS Class Props

Prop	Type	Default	Description
errorClassName	string	'p-error'	CSS class applied to error message elements.
iconAddonClassName	string	'p-inputgroup-addon'	CSS class applied to icon addon containers.

Framework Integration Examples

PrimeReact Integration

import { CommandForm } from '@cratis/arc.react/commands';
import { Tooltip } from 'primereact/tooltip';
import 'primereact/resources/themes/lara-light-blue/theme.css';
import 'primereact/resources/primereact.min.css';

const PrimeFieldDecorator = ({ icon, description, children }) => (
    <div className="p-inputgroup">
        {icon && <span className="p-inputgroup-addon">{icon}</span>}
        {children}
    </div>
);

const PrimeErrorDisplay = ({ errors }) => (
    <div>
        {errors.map((error, idx) => (
            <small key={idx} className="p-error block mt-1">{error}</small>
        ))}
    </div>
);

function MyForm() {
    return (
        <CommandForm
            command={MyCommand}
            fieldDecoratorComponent={PrimeFieldDecorator}
            errorDisplayComponent={PrimeErrorDisplay}
            errorClassName="p-error"
            iconAddonClassName="p-inputgroup-addon"
        >
            {/* Your fields */}
        </CommandForm>
    );
}

Tailwind CSS Integration

const TailwindFieldDecorator = ({ icon, description, children }) => (
    <div className="relative" title={description}>
        {icon && (
            <div className="absolute inset-y-0 left-0 flex items-center pl-3 pointer-events-none">
                {icon}
            </div>
        )}
        <div className={icon ? 'pl-10' : ''}>
            {children}
        </div>
    </div>
);

const TailwindErrorDisplay = ({ errors }) => (
    <div className="mt-1 space-y-1">
        {errors.map((error, idx) => (
            <p key={idx} className="text-sm text-red-600 flex items-center gap-1">
                <svg className="w-4 h-4" fill="currentColor" viewBox="0 0 20 20">
                    <path fillRule="evenodd" d="M10 18a8 8 0 100-16 8 8 0 000 16zM8.707 7.293a1 1 0 00-1.414 1.414L8.586 10l-1.293 1.293a1 1 0 101.414 1.414L10 11.414l1.293 1.293a1 1 0 001.414-1.414L11.414 10l1.293-1.293a1 1 0 00-1.414-1.414L10 8.586 8.707 7.293z" clipRule="evenodd" />
                </svg>
                <span>{error}</span>
            </p>
        ))}
    </div>
);

function MyForm() {
    return (
        <CommandForm
            command={MyCommand}
            fieldDecoratorComponent={TailwindFieldDecorator}
            errorDisplayComponent={TailwindErrorDisplay}
            errorClassName="text-sm text-red-600 mt-1"
        >
            {/* Your fields */}
        </CommandForm>
    );
}

Combining Customizations

You can combine multiple customization options for complete control:

<CommandForm
    command={MyCommand}
    showTitles={false}                              // Disable auto titles
    showErrors={true}                               // Keep auto errors
    fieldContainerComponent={CustomFieldContainer}  // Custom container
    fieldDecoratorComponent={CustomFieldDecorator}  // Custom field decoration
    errorDisplayComponent={CustomErrorDisplay}      // Custom error rendering
    tooltipComponent={CustomTooltip}                // Custom tooltips
    errorClassName="my-error"                       // Custom error CSS class
    iconAddonClassName="my-icon"                    // Custom icon CSS class
>
    <h2>Account Information</h2>
    <InputTextField<MyCommand>
        value={c => c.username}
        title="Username"
        icon={<span>👤</span>}
        description="Choose a unique username"
        required
    />
    <InputTextField<MyCommand>
        value={c => c.email}
        type="email"
        title="Email"
        icon={<span>📧</span>}
        description="We'll never share your email"
        required
    />

    <h2>Profile</h2>
    <TextAreaField<MyCommand> value={c => c.bio} title="Bio" />
</CommandForm>

Best Practices

1. Consistency: Use the same customization approach across all forms in your application
2. Accessibility: Ensure custom rendering maintains proper accessibility (labels, ARIA attributes)
3. Validation: Keep error messages visible and clear regardless of customization
4. Performance: Avoid creating new component instances on each render (define outside or use useMemo)
5. Testing: Test custom components with various validation states and error messages

See Also

• CommandForm Overview
• Built-in Field Types
• Validation
• Advanced Usage