@formkit/validation

• Introduction
• Functions
  • createMessageName()
  • createValidationPlugin()
  • getValidationMessages()
• TypeScript
  • FormKitValidationHints
  • FormKitValidationMessages
  • FormKitValidationRules
  • FormKitValidation
  • FormKitValidationI18NArgs
  • FormKitValidationIntent
  • FormKitValidationRule

Introduction

The first-party validation package/plugin for FormKit. Read the validation documentation for usage instructions.

Functions

createMessageName()

Given a node, this returns the name that should be used in validation messages. This is either the validationLabel prop, the label prop, or the name of the input (in that order).

Signature

createMessageName(node: FormKitNode): string;

Parameters

• node — The node to display

Returns

createValidationPlugin()

The actual validation plugin function. Everything must be bootstrapped here.

Signature

createValidationPlugin(baseRules?: FormKitValidationRules): (node: FormKitNode) => void;

Parameters

• baseRules optional — Base validation rules to include in the plugin. By default, FormKit makes all rules in the @formkit/rules package available via the defaultConfig.

getValidationMessages()

Extracts all validation messages from the given node and all its descendants. This is not reactive and must be re-called each time the messages change.

Signature

getValidationMessages(node: FormKitNode): Map<FormKitNode, FormKitMessage[]>;

Parameters

• node — The FormKit node to extract validation rules from — as well as its descendants.

TypeScript

FormKitValidationHints

Special validation properties that affect the way validations are applied.

interface FormKitValidationHints {
    blocking: boolean;
    debounce: number;
    force: boolean;
    name: string;
    skipEmpty: boolean;
}

FormKitValidationMessages

The interface for the localized validation message registry.

interface FormKitValidationMessages {
    [index: string]: string | ((...args: FormKitValidationI18NArgs) => string);
}

FormKitValidationRules

FormKit validation rules are structured as on object of key/function pairs where the key of the object is the validation rule name.

interface FormKitValidationRules {
    [index: string]: FormKitValidationRule;
}

FormKitValidation

Defines what fully parsed validation rules look like.

type FormKitValidation = {
    rule: FormKitValidationRule;
    args: any[];
    timer: number;
    state: boolean | null;
    queued: boolean;
    deps: FormKitDependencies;
    messageObserver?: FormKitObservedNode;
} & FormKitValidationHints;

FormKitValidationI18NArgs

The arguments that are passed to the validation messages in the i18n plugin.

type FormKitValidationI18NArgs = [
    {
        node: FormKitNode;
        name: string;
        args: any[];
        message?: string;
    }
];

FormKitValidationIntent

Defines what validation rules look like when they are parsed, but have not necessarily had validation rules substituted in yet.

type FormKitValidationIntent = [string | FormKitValidationRule, ...any[]];

FormKitValidationRule

Signature for a generic validation rule. It accepts an input — often a string — but should be able to accept any input type, and returns a boolean indicating whether or not it passed validation.

type FormKitValidationRule = {
    (node: FormKitNode, ...args: any[]): boolean | Promise<boolean>;
    ruleName?: string;
} & Partial<FormKitValidationHints>;