Refract
  • Read Me
  • Introduction
    • Why Refract?
    • Core Concepts
    • Thinking In Refract
    • Alternatives
  • Usage
    • Getting Started
    • Installation
    • Connecting To React
    • Observing React, Preact and Inferno
    • Injecting Dependencies
    • Observing Redux
    • Observing Anything
    • Handling Effects
    • Pushing to Props
    • Rendering Components
    • Handling Errors
    • Testing
  • Recipes
    • Dependency Injection
    • Creating An API Dependency
    • Handling state
    • Replacing Redux Connect
  • Examples
    • Debounced fetch
    • Counter
    • Field validation
    • Redux fetch
    • Routing
    • Typeahead
    • Visit time
  • API
    • compose
    • withEffects
    • toProps, asProps
    • useRefract
    • refractEnhancer (Redux)
  • Glossary
  • Feedback
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On this page
  • Field Validation
  • Aperture
  • Handler
  • Result
  1. Examples

Field validation

PreviousCounterNextRedux fetch

Last updated 6 years ago

Field Validation

callbag

most

RxJS

xstream

This basic example renders a single text input which prompts for a GitHub username; the current username of this input is stored in React component state.

Aperture

Only one source is observed:

  • The username prop.

Every time the input's username changes, the new username is passed to the stream. Any blank strings are filtered from the stream, and then the usernames are debounced for one second.

After debouncing, a fetch request is made and resolved. If a user is found, an effect with type USER_FOUND is output; if no user is found, an effect with type USERNAME_AVAILABLE is output.

Handler

The Refract handler toggles the available state appropriately depending on the effect's type.

Result

The end result is an input field with asynchronous validation handled as a side-effect.

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