Strickland
  • Readme
  • Introduction
    • Validators
    • Validation
    • Validation Results
  • Extensibility
    • Validator Factories
    • Validation Context
    • Validation Result Props
    • Extensibility Pattern
    • formatResult
  • Built-In Validators
    • required
    • compare
    • min
    • max
    • range
    • minLength
    • maxLength
    • length
  • Composition
    • Arrays of Validators
      • every
      • all
      • some
    • Validating Array Elements
      • arrayElements
    • Validating Objects
      • objectProps
      • Advanced Object Validation
      • Nested Objects
      • Arrays of Objects
    • Composition Conventions
    • Composition and formatResult
  • Async Validation
    • Resolving Async Validation
    • Deferred Async Validation
    • Async Validator Arrays and Objects
    • Two-Stage Sync/Async Validation
    • Race Conditions
    • Automatic Race Condition Handling
    • Async Validation and formatResult
  • Form Validation
    • form
    • Async Form Validation
    • validateFields
    • emptyResults
    • updateFieldResults
  • Inspiration
  • Design Goals
  • Wrap-Up
  • Change Log
  • NPM
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  • Named Props
  • Parameters
  • Usage

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  1. Built-In Validators

minLength

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Last updated 4 years ago

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The minLength validator checks that a string value has a length at least the minimum length provided.

If the value being validated is null or an empty string, then the result will be valid. This respects the rule of thumb described in the notes for the validator.

Named Props

  • minLength: The minimum length compared against

Parameters

The minLength validator supports three parameter signatures:

  1. minLength(value) where the value is used as the minLength named prop

  2. minLength(propsObject) where the props object contains a minLength named prop

  3. minLength(propsFunction) where the props function returns a props object with a minLength named prop

Usage

import validate, {minLength} from 'strickland';

// As a value parameter
const minLengthOf3 = minLength(3);

// As a named prop
const minLengthOf2 = minLength({
    minLength: 2,
    message: 'Must have a length of at least 2'
});

// As a function that resolves to have the named prop
const minLengthValidator = minLength((context) => ({
    minLength: context.minLength,
    message: `Must have a length of at least ${context.minLength}`
}));
required