New Examples / Sandboxes

[jaredpalmer]

Going through a lot of issues yesterday, I think it would be great to add some new sandboxes/examples:

• checkboxes (to array) (Any example of FieldArray check all? #1386)
• radios ([docs] Add guide for radio and checkbox input #1035)
• dependent select fields (a select input that conditionally renders another field) (Request for an example of dependant and dynamic selects #1205)
• nested forms (modals within forms) (Nested Forms #826, How to call handleSubmit on a particaular set of fields? #1298)
• masked inputs (Masked inputs #610, Masked input not working #1307)
• multi step forms (Multistep Wizard example - How to access this.state.value from Wizard inside each Wizard.page? #844, A working example of the MultistepWizard for react native #1438, MultistepWizard example validation broken #767)
• File Upload forms (Handling file input #45 )

Nice to have

• Autosave (Extensibility Needed - Use Case: Auto-Save & Partial Submit #1506)
• Usage with CDN (How to use Formik with a CDN #1463)
• Usage with React Native (Form Validation WIth Formik and React Native #1378)

[EfstathiadisDimitris]

I can handle checboxes if that's ok. But a couple of questions. Could we get a little more explanations regarding the other 3. What is the requirements.

If you can provide more scenarios I would be happy to help...

[billdybas]

I made a sandbox for #1205. Let me know if there's anything to improve / if we should move it into an example. I believe that issue was talking about two selects which are always shown where choosing an option in the first select changes what options are available in the second select.

If desired, I can make another sandbox where a select's selected value will hide/show another field.

[jamesmosier]

I created two examples for masked inputs.

1. Based off of the input primitives example to allow for regular or masked inputs using the same component: https://codesandbox.io/s/7259y11530
2. A very basic example of how to use react-text-mask: https://codesandbox.io/s/248vzprz2p

[denis-souzaa]

@jamesmosier your solution working for me. Thanks

[MattWilliamsDev]

A multi-select example would be incredibly helpful as well. Additionally, I've been hitting issues trying to get a RadioGroup with boolean values working. It's a simple Email Notifications: Enable or Disable radio group. Having an example of this would be quite helpful as well.

[Andreyco]

Started work on these, will provide WIP soon

[Andreyco]

While working on examples and with Docusaurus... It is kinda limiting but hard to imagine managing docs versioning on our own. Any plans here? Is there something better?

Edit
https://www.docz.site/ but no versioning by default 😔

[Andreyco]

WIP and preview here https://festive-wozniak-c71293.netlify.com
source here https://github.com/Andreyco/formik/tree/feature/examples/formik-examples

[Andreyco]

cc @demkovych - I just added radio boxes example with "check all" functionality

[tkrebs2]

WIP and preview here https://festive-wozniak-c71293.netlify.com
source here https://github.com/Andreyco/formik/tree/feature/examples/formik-examples

@Andreyco are there any working sandboxes floating around with current formik versions that implement radio checkbox group?

[benjiwheeler]

@Andreyco are there any working sandboxes floating around with current formik versions that implement radio checkbox group?

+1 on this question

[viniciusdacal]

Auto save form example #1506:
https://codesandbox.io/s/formik-example-7fkw6

[tobeycodes]

I created a FormWizard that uses Yup and Hooks. Might be useful for someone here

import React, { useState, ReactElement } from 'react';
import {
  Formik,
  validateYupSchema,
  yupToFormErrors,
  FormikErrors,
  FormikValues,
  FormikActions,
} from 'formik';
import Button from '../../styles/Button';

interface MyProps {
  children: ReactElement[];
  onSubmit: CallableFunction;
  initialValues: FormikValues;
}

const FormWizard = (props: MyProps): JSX.Element => {
  const { children, onSubmit, initialValues } = props;
  const [page, setPage] = useState(0);
  const activePage = React.Children.toArray(children)[page];
  const isLastPage = page === React.Children.count(children) - 1;

  const previous = (): void => {
    setPage(Math.max(page - 1, 0));
  };

  const next = (): void => {
    setPage(Math.min(page + 1, children.length - 1));
  };

  const validate = (values: FormikValues): FormikErrors<FormikValues> => {
    if (activePage.props.validationSchema) {
      try {
        validateYupSchema(values, activePage.props.validationSchema, true);
      } catch (err) {
        return yupToFormErrors(err);
      }
    }

    return {};
  };

  const handleSubmits = (
    values: FormikValues,
    { setSubmitting }: FormikActions<FormikValues>,
  ): void => {
    if (activePage.props.onPageSubmit) {
      activePage.props.onPageSubmit();
    }
    if (isLastPage) {
      onSubmit(values);

      return;
    }

    setSubmitting(false);
    next();
  };

  return (
    <Formik
      initialValues={initialValues}
      validate={validate}
      onSubmit={handleSubmits}
      render={({ values, handleSubmit, isSubmitting }): JSX.Element => (
        <form onSubmit={handleSubmit}>
          {activePage}

          {page > 0 && (
            <Button type="button" onClick={previous}>
              Previous
            </Button>
          )}

          <Button type="submit" disabled={isSubmitting}>
            {isLastPage ? 'Submit' : 'Next'}
          </Button>

          <pre>{JSON.stringify(values, null, 2)}</pre>
        </form>
      )}
    />
  );
};

export default FormWizard;

And how a basic example of how to use it

import React from 'react';
import * as Yup from 'yup';
import { Field } from 'formik';
import FormInput from '../components/FormInput';
import FormWizard from '../components/FormWizard';

const page1ValidationSchema = Yup.object().shape({
  firstName: Yup.string()
    .email('1Email is not a valid email address')
    .required('1Email is required'),
});

const page2ValidationSchema = Yup.object().shape({
  email: Yup.string()
    .email('Email is not a valid email address')
    .required('Email is required'),
});

const Page1 = () => (
  <div>
    <div>
      <label>First Name</label>
      <Field
        name="firstName"
        component="input"
        type="text"
        placeholder="First Name"
        component={FormInput}
      />
    </div>
  </div>
);

const Page2 = () => (
  <div>
    <div>
      <label>Email</label>
      <Field
        name="email"
        component="input"
        type="text"
        placeholder="Email"
        component={FormInput}
      />
    </div>
  </div>
);

const onSubmit = (values, actions) => {
  console.log(values);
};

const onPage1Submit = () => {
  console.log('bob');
};

const InnerForm = (): JSX.Element => (
  <FormWizard
    initialValues={{
      firstName: '',
      lastName: '',
      email: '',
      favoriteColor: '',
    }}
    onSubmit={onSubmit}
  >
    <Page1
      validationSchema={page1ValidationSchema}
      onPageSubmit={onPage1Submit}
    />
    <Page2 validationSchema={page2ValidationSchema} />
  </FormWizard>
);

export default InnerForm;

[Fieel]

#1035 has been closed even though it's not a duplicate nor resolved here, even with examples (docs would be better).

[WestonThayer]

Here is a simple example for a set/group of radio buttons: https://codesandbox.io/s/formik-radio-button-group-example-d6l33

[vincentntang]

I wrote an example using Reactstrap (UI library) with Yup + Formik, demonstrating all the important features for a wizard. Uses class components

https://github.com/vincentntang/multistep-wizard-formik-yup-reactstrap

[VinothiniBalakrishnan]

Here is a simple example for a set/group of radio buttons: https://codesandbox.io/s/formik-radio-button-group-example-d6l33

You did a great job. Thank you so much for your demo with radio button

[patspam]

Here's an updated Multistep Wizard that uses hooks, and Yup: https://codesandbox.io/s/formik-multistep-wizard-5bkkl?file=/index.js

(Evolved from @schrapel's example, updated for Formik 2.x, removed Formik internals, made more extensible, etc)

[BenjDG]

Some examples with fetch or http requests on submit would be helpful.

[johnrom]

@BenjDG there is nothing special about fetch or http requests on submit, so documenting is a little out of scope. We do document that onSubmit can be async.

Here's a fetch request and associated documentation:

<Formik 
  onSubmit={async (values) => {
    const response = await fetch(endpointUrl, { 
      method: 'POST',
      headers: {
        'Content-Type': 'application/json'
        // 'Content-Type': 'application/x-www-form-urlencoded',
      },
      body: JSON.stringify(values), // or build a new FormData() for x-www-form-urlencoded
    });
    const result = response.json();

    console.log(result); // your API's response as an object
  }}
/>

[BenjDG]

I think some of the links in the Tutorial section point to the wrong code sandbox and it was throwing me off a bit. Thanks for your help!

[johnrom]

@BenjDG do you know which ones? it'd be great to note them down to fix them. glad I could help!

[BenjDG]

At this url - https://jaredpalmer.com/formik/docs/tutorial

“You can see what we'll be building here: Final Result. “ - this links to https://codesandbox.io/s/formik-v2-tutorial-final-bq0li (when you test the form, it doesn’t work. Also, it has “lol” in the code.

[johnrom]

Thanks! That should have been fixed in #2484. Guess it hasn't made it to the site yet?

[lsbyerley]

Does anyone have an example of storing any edits made to initialValues in a separate object? Essentially this "edited" object would only store properties that differ from their respective value in initialValues. I guess this would also contain newly added or deleted values as well.

[mkelley33]

Is there an example of selecting all checkboxes?

[nishojib]

@mkelley33

I haven't really found an example of selecting all checkboxes, so https://codesandbox.io/s/select-all-formik-lny9l this is what I have been using.

Any other solution is always welcome.

[mossa-Sammer]

@patspam
can you explain this please, I don't see if it's using any component from Formik, as it takes Formik component props,
also, typescript blaming me when I pass these props
also, I changed it to use a plain div and it works, how? I don't know
cc: @jaredpalmer
https://github.com/formium/formik/blob/559667c823331e8be85a50e8240e45f7c782fa3c/examples/MultistepWizard.js#L76

[mossa-Sammer]

would love to see something official for managing multistep forms

[dhlpradip]

Is issue #1386 still unsolved? help needed