Created
November 22, 2019 21:02
-
-
Save agmcleod/921c5798c4ba7285bc12bff8ebd6d82b to your computer and use it in GitHub Desktop.
This can be tested via create react app.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
.App { | |
text-align: center; | |
} | |
.App-logo { | |
height: 40vmin; | |
} | |
.App-header { | |
background-color: #282c34; | |
min-height: 100vh; | |
display: flex; | |
flex-direction: column; | |
align-items: center; | |
justify-content: center; | |
font-size: calc(10px + 2vmin); | |
color: white; | |
} | |
.App-link { | |
color: #09d3ac; | |
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import React from "react"; | |
import { Formik, Field } from "formik"; | |
import * as yup from "yup"; | |
import { DisplayFormikState } from "./helper"; | |
import "./App.css"; | |
const validationSchema = yup.object().shape({ | |
menu1: yup.string().required(), | |
menu2: yup.string().required() | |
}); | |
const initialValues = { | |
menu1: undefined, | |
menu2: undefined | |
}; | |
const MENUS = [ | |
{ | |
options: ["1", "2", "3"] | |
}, | |
{ | |
options: ["a", "b", "c"] | |
} | |
]; | |
class Fields extends React.Component { | |
componentDidUpdate(prevProps) { | |
const { formik } = this.props; | |
if (formik.values.menu1 !== prevProps.formik.values.menu1) { | |
formik.setFieldValue("menu2", ""); | |
} | |
} | |
render() { | |
const { formik } = this.props; | |
return ( | |
<React.Fragment> | |
<h1>Your code here</h1> | |
<button type="submit">Submit</button> | |
<Field name="menu1"> | |
{({ field }) => ( | |
<select | |
value={field.value} | |
onChange={ev => { | |
const { value } = ev.target; | |
formik.setFieldValue("menu1", value); | |
formik.setFieldTouched("menu1", true); | |
}} | |
> | |
<option value="">Select</option> | |
{MENUS[0].options.map(o => ( | |
<option value={o}>{o}</option> | |
))} | |
</select> | |
)} | |
</Field> | |
<Field name="menu2"> | |
{({ field }) => ( | |
<select | |
value={field.value} | |
onChange={ev => { | |
const { value } = ev.target; | |
formik.setFieldValue("menu2", value); | |
formik.setFieldTouched("menu2", true); | |
}} | |
> | |
<option value="">Select</option> | |
{MENUS[0].options.map(o => ( | |
<option value={o}>{o}</option> | |
))} | |
</select> | |
)} | |
</Field> | |
</React.Fragment> | |
); | |
} | |
} | |
const App = () => ( | |
<div className="App"> | |
<Formik | |
initialValues={initialValues} | |
onSubmit={() => {}} | |
validationSchema={validationSchema} | |
> | |
{props => { | |
return ( | |
<form onSubmit={props.handleSubmit}> | |
<Fields formik={props} /> | |
<DisplayFormikState {...props} /> | |
</form> | |
); | |
}} | |
</Formik> | |
</div> | |
); | |
export default App; |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import React from "react"; | |
export const DisplayFormikState = props => ( | |
<div style={{ margin: "1rem 0" }}> | |
<h3 style={{ fontFamily: "monospace" }} /> | |
<pre | |
style={{ | |
background: "#f6f8fa", | |
fontSize: ".65rem", | |
padding: ".5rem", | |
textAlign: "left" | |
}} | |
> | |
<strong>props</strong> = {JSON.stringify(props, null, 2)} | |
</pre> | |
</div> | |
); |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
{ | |
"name": "formiktest", | |
"version": "0.1.0", | |
"private": true, | |
"dependencies": { | |
"formik": "^2.0.6", | |
"react": "^16.12.0", | |
"react-dom": "^16.12.0", | |
"react-scripts": "3.2.0", | |
"yup": "^0.27.0" | |
}, | |
"scripts": { | |
"start": "react-scripts start", | |
"build": "react-scripts build", | |
"test": "react-scripts test", | |
"eject": "react-scripts eject" | |
}, | |
"eslintConfig": { | |
"extends": "react-app" | |
}, | |
"browserslist": { | |
"production": [ | |
">0.2%", | |
"not dead", | |
"not op_mini all" | |
], | |
"development": [ | |
"last 1 chrome version", | |
"last 1 firefox version", | |
"last 1 safari version" | |
] | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment