npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

create-formik-fields-comparator

v1.2.0

Published

Simple utility to help avoiding unnecessary re-renders in Formik forms

Downloads

3

Readme

createFormikFieldsComparator

Simple NPM module to help avoiding unnecessary re-renders in Formik form field components.

Mainly inspired by this article: https://travix.io/using-recompose-hocs-to-get-better-performance-in-forms-using-formik-and-yup-e51024d645ba

Sorry for the long name thou :smile:

Usage

$ npm install create-formik-fields-comparator --save

Then feel free to use it in the shouldComponentUpdate lifecycle of your form fieldset or field components.

import React from 'react';
import createFormikFieldsComparator from 'create-formik-fields-comparator';

/**
 * Example MyComponent
 * 
 * This is a class based example of how you would
 * use this utility inside your component lifecycle 
 */
export default class MyComponent extends React.Component {
    shouldComponentUpdate(prevProps, nextProps) {
        const compare = createFormikFieldsComparator(['email']);
        return compare(prevProps, nextProps);
    }

    render() {
        return (
            <input
                name="email"
                value={this.props.values.email}
                onChange={this.props.onChange}
            />
        );
    }
}

Or with recompose.

import React from 'react';
import shouldUpdate from 'recompose/shouldUpdate';
import createFormikFieldsComparator from 'create-formik-fields-comparator';

/**
 * Example MyComponent
 * 
 * This is a stateless version
 * of how you would use this utility
 * inside your components.
 * 
 * Note how this component only
 * cares about the `email` field.
 */
const MyComponent = ({
    values,
    onChange,
}) => (
    <input
        name="email"
        value={values.email}
        onChange={onChange}
    />
);

const enhance = shouldUpdate(createFormikFieldsComparator(['email']));

export default enhance(MyComponent);

Full Example with Recompose and Yup

Disclaimer: I made this thinking about its usage with libraries like recompose or proppy. I would recommend to use this in combination with one of these two libraries, or at least with homemade higher order components.

/** FormSchema.js */
import object from 'yup/lib/object';
import string from 'yup/lib/string';

export default object({
  email: string().nullable().required('Type an email'),
  facebook: string().nullable().required('Type your facebook'),
  twitter: string().nullable().required('Type your twitter'),
});
/** EmailInput.js */
import React, { Fragment } from 'react';
import shouldUpdate from 'recompose/shouldUpdate';
import createFormikFieldsComparator from 'create-formik-fields-comparator';

const EmailInput = ({
    values,
    errors,
    touched,
    onChange,
    onBlur
}) => (
    <Fragment>
        <input
            type="email"
            name="email"
            onChange={onChange}
            onBlur={onBlur}
            value={values.email}
        />
        {errors.email && touched.email && <div>{errors.email}</div>}
    </Fragment>
);

const enhance = shouldUpdate(
    createFormikFieldsComparator(['email'])
);

export default enhance(EmailInput);
/** SocialFieldset.js */
import React, { Fragment } from 'react';
import shouldUpdate from 'recompose/shouldUpdate';
import createFormikFieldsComparator from 'create-formik-fields-comparator';

const SocialFieldset = ({
    values,
    errors,
    touched,
    onChange,
    onBlur
}) => (
    <Fragment>
        <input
            type="text"
            name="facebook"
            onChange={onChange}
            onBlur={onBlur}
            value={values.facebook}
        />
        {errors.facebook && touched.facebook && <div>{errors.facebook}</div>}
        <input
            type="text"
            name="twitter"
            onChange={onChange}
            onBlur={onBlur}
            value={values.twitter}
        />
        {errors.twitter && touched.twitter && <div>{errors.twitter}</div>}
    </Fragment>
);

const enhance = shouldUpdate(
    createFormikFieldsComparator(['facebook', 'twitter'])
);

export default enhance(SocialFieldset);
/** Form.js */
import React from 'react';
import { withFormik } from 'formik';

import FormSchema from './FormSchema';
import EmailInput from './EmailInput';
import SocialFieldset from './SocialFieldset';

const Form = ({
    values,
    errors,
    touched,
    handleSubmit,
    handleChange,
    handleBlur,
    handleReset,
    isSubmitting,
}) => (
    <form onSubmit={handleSubmit}>
        {/**
          *
          * The EmailInput will only update when 
          * something related to the fields it is interested to change
          *
          **/}
        <EmailInput
            values={values}
            errors={errors}
            touched={touched}
            onChange={handleChange}
            onBlur={handleBlur}
        />
        {/**
          *
          * The SocialFieldset will only update when 
          * something related to the fields it is interested to change
          *
          **/}
        <SocialFieldset
            values={values}
            errors={errors}
            touched={touched}
            onChange={handleChange}
            onBlur={handleBlur}
        />
        <button type="submit" disabled={isSubmitting}>
            Submit
        </button>
    </form>
);

const enhance = withFormik({
    handleSubmit: (values, actions) => {
        /** do something on submit */
    },
    mapPropsToValues = props => ({
        email: null,
        facebook: null,
        twitter: null
    }),
    validationSchema: FormSchema
});

export default enhance(Form);

Contributors

  • Armando Magalhaes