I have a mock database for playing around with some loaders and actions.
Here's the rough layout:
const db = { key: "bar" }
export const action = async ({ request }) => {
db.key = "foo"
}
export const loader = async ({ request }) => {
return json(db)
}
I have an issue though. When the action is called, it successfully updates db.key, however, the loader is called afterwards & the value is {key: "bar" }. Does anyone know why the object is not updated when the loader is called again?
I think that there is something related to "Data Writes" topic.
Whenever a form is submitted it reload all of the data for all of the routes on the page. Thats why many people reach for global state management libraries like redux.
I don't know if it helps but here I got a simple way where you can send a post request, update it with the action and load the content searching at the URL with the loader.
export const action: ActionFunction = async ({ request }) => {
const form = await request.formData();
const key = form.get("key");
return redirect(`/?key=${key}_updated`);
};
export const loader: LoaderFunction = async ({ request }: any) => {
const url = new URL(request.url);
const key = url.searchParams.get("key");
return json({ key });
};
export default function Index() {
const loaderData = useLoaderData();
return (
<div>
<span>loaderData: {loaderData.key}</span>
<Form method="post">
<input type="text" id="key" name="key" defaultValue={loaderData.key} />
<button>Submit</button>
</Form>
</div>
);
}
In my form, I have a checkbox for captcha that needs toggled for the form to be valid, however on load, the form still shows as valid. I can check the box to enable the form, and then uncheck it again, and THEN the form shows as properly disabled.
I am using the HOC withFormik implementation. I have tried using setTouched & setFieldTouched on the checkbox, and even setting this.props.touched.captcha = true. I have also tried passing isInitialValid: false to withFormik.
Another thing I tried is passing mapPropsToTouched, but that method doesn't get called.
I am using formik v 1.5.8
How can I make the form initially disabled until I engage the checkbox?
export class LoginForm extends React.Component {
render() {
const {
initialValues,
initialTouched,
validationSchema,
onSubmit,
children
} = this.props;
return (
<div>
<Formik
initialValues={initialValues}
initialTouched={initialTouched}
validationSchema={validationSchema}
onSubmit={onSubmit}
render={(formikProps) => {
return (
<Form>
{React.Children.map(children, (child, index) => {
return (
<div className='Form__row'>
{React.cloneElement(child, { index })}
</div>
);
})}
</Form>
);
}}
/>
</div>
);
}
}
const mapDispatchToProps = {};
export function mapStateToProps(state) {
return {};
}
export default compose(
connect(mapStateToProps, mapDispatchToProps),
withFormik({
// isInitialValid: false,
// mapPropsToTouched: (props) => {
// console.log('🚀 ~ file: LoginForm.jsx ~ line 257 ~ props', props);
// },
mapPropsToValues: (props) => {
return {
username: props.previousUsername ? props.previousUsername : '',
password: '',
rememberMe: true,
captcha: false
};
}
})
)(LoginForm);
I have a main page containing a component called single-contact as below:
<el-row id="rowContact">
<!-- Contacts -->
<el-scrollbar wrap-class="list" :native="false">
<single-contact ref="singleContact"></single-contact>
</el-scrollbar>
</el-row>
And I want to dynamically render this component after AJAX polling, so in SingleContact.vue I use $axios and mounted() to request the data from the backend. And I want to render the component using v-for. I have my code as:
<template>
<div :key="componentKey">
<el-row id="card" v-for="contact in contacts" :key="contact.convUsername">
<div id="avatar" ><el-avatar icon="el-icon-user-solid"></el-avatar></div>
<h5 id='name' v-if="contact">{{contact.convUsername}}</h5>
<div id='btnDel'><el-button size="medium" type="danger" icon="el-icon-delete" v-on:click="delContact(contact.convUsername)"></el-button></div>
</el-row>
</div>
</template>
And the data structure is:
data() {
return {
timer: null,
contacts: []
}
And the method of Ajax polling is:
loadContacts () {
var _this = this
console.log('loading contacts')
console.log(localStorage.getItem('username'))
this.$axios.post('/msglist',{
ownerUsername: localStorage.getItem('username')
}).then(resp => {
console.log('success')
var json = JSON.stringify(resp.data);
_this.contacts = JSON.parse(json);
console.log(json);
console.log(_this.contacts[0].convUserName);
// }
}).catch(failResponse => {
console.log(failResponse)
})
}
This is what I get in the console:
Console Result
And the mounted method I compute is as:
beforeMount() {
var self = this
this.$axios.post('/msglist',{
ownerUsername: localStorage.getItem('username')
}).then(resp => {
this.$nextTick(() => {
self.contacts = resp.data
})
}).catch(failResponse => {
console.log(failResponse)
})
},
mounted() {
this.timer = setInterval(this.loadContacts(), 1000)
this.$nextTick(function () {
this.loadContacts()
})
},
beforeDestroy() {
clearInterval(this.timer)
this.timer = null
}
I can get the correct data in the console. It seems that the backend can correctly send json to the front, and the front can also receive the right result. But the page just doesn't render as expected.
Any advice would be great! Thank you in advance!
I have written code, which uses a Modal dialog to display a form.
My react app is rendered at "root"
index.html
<div id="root"></div>
App.js
const store = configureStore();
ReactDOM.render(
<Provider store={store}>
<ExampleBasic/>
</Provider>
, document.getElementById('root'));
ExmpleBasic.js
Please ignore state management in component here. this is just for example.
import React, { PureComponent } from 'react';
import Lorem from 'react-lorem-component';
import Modal from '#atlaskit/modal-dialog';
import Button from '#atlaskit/button';
export default class ExampleBasic extends PureComponent {
state = { isOpen: false }
open = () => this.setState({ isOpen: true })
close = () => this.setState({ isOpen: false })
secondaryAction = ({ target }) => console.log(target.innerText)
render() {
const { isOpen } = this.state;
const actions = [
{ text: 'Close', onClick: this.close },
{ text: 'Secondary Action', onClick: this.secondaryAction },
];
return (
<div>
<Button onClick={this.open}>Open Modal</Button>
{isOpen && (
<Modal
actions={actions}
onClose={this.close}
heading="Modal Title"
>
<BasicFormContainer />
</Modal>
)}
</div>
);
}
}
BasicFormContainer.js
const mapStateToProps = state => ({
addDesignation: state.designations.addDesignation,
});
const mapDispatchToProps = dispatch => ({
});
export default connect(mapStateToProps, mapDispatchToProps)(BasicForm);
BasicForm.js
import React, { Component } from 'react';
import { Field, reduxForm } from 'redux-form';
class BasicForm extends Component {
constructor(props) {
super(props);
this.submit = this.submit.bind(this);
}
submit(values) {
console.log(values);
}
render() {
const { handleSubmit } = this.props;
return (
<form onSubmit={handleSubmit(this.submit)}>
<Field
name="designationName"
component="input"
placeholder="Name"
label="Enter name"
autoFocus
/>
</form>
);
}
}
export default reduxForm({
form: 'BasicForm',
enableReinitialize: true,
})(BasicForm);
However modal is rendered using portal, outside current DOM.
As modal is rendered outside the scope of redux context, it is not getting the
store. and i am getting an error "Uncaught Error: Field must be inside a component decorated with reduxForm()"
Below is link to same kind of problem, where redux form within portal is not working.
Redux Form Wrapped Inside Custom Portal Component?
in React 16 it is handled by portals, but version before then that you can try something like as follow.
export default class ExampleBasic extends PureComponent {
...
static contextTypes = { store: React.PropTypes.object };
render() {
const { isOpen } = this.state;
const actions = [
{ text: 'Close', onClick: this.close },
{ text: 'Secondary Action', onClick: this.secondaryAction },
];
return (
<div>
<Button onClick={this.open}>Open Modal</Button>
{isOpen && (
<Modal
actions={actions}
onClose={this.close}
heading="Modal Title"
>
<Provider store={this.context.store}>
<BasicFormContainer />
</Provider>
</Modal>
)}
</div>
);
}
}
You need to pass in the values of BasicForm.js to the Redux store and dispatch an action from there itself and not from the BasicFormContainer.js. This way, the Modal remains inside of the scope of your root element and thus there is no need to access the store outside of the Provider.
Then update the Redux store based on the values entered in the form. Once, the store is updated, you can then access it from anywhere in your application such as Modal in your case.
I downgraded to version 2.1.0 to solve the problem.
On the official pages and in the GitHub issues for redux-form there are more than one example of how to work with initialValues however I cannot find a single one that focuses on explaining how initialValues can be set in response to an asynchronous source.
The main case that I have in mind is something like a simple CRUD application where a user is going to edit some entity that already exists. When the view is first opened and the redux-form component is mounted but before the component is rendered the initialValues must be set. Lets say that in this example that the data is loaded on demand when the component is first mounted and rendered for the first time. The examples show setting initialValues based on hard coded values or the redux store state but none that I can find focus on how to set the initialValues based on something async like a call to XHR or fetch.
I'm sure I'm just missing something fundamental so please point me in the right direction.
References:
Initializing Form State
Handling form defaults
What is the correct way to populate a dynamic form with initial data?
EDIT: Updated Solution from ReduxForm docs
This is now documented in the latest version of ReduxForm, and is much simpler than my previous answer.
The key is to connect your form component after decorating it with ReduxForm. Then you will be able to access the initialValues prop just like any other prop on your component.
// Decorate with reduxForm(). It will read the initialValues prop provided by connect()
InitializeFromStateForm = reduxForm({
form: 'initializeFromState'
})(InitializeFromStateForm)
// now set initialValues using data from your store state
InitializeFromStateForm = connect(
state => ({
initialValues: state.account.data
})
)(InitializeFromStateForm)
I accomplished this by using the redux-form reducer plugin method.
The following demos fetching async data and pre-populating a user form with response.
const RECEIVE_USER = 'RECEIVE_USER';
// once you've received data from api dispatch action
const receiveUser = (user) => {
return {
type: RECEIVE_USER,
payload: { user }
}
}
// here is your async request to retrieve user data
const fetchUser = (id) => dispatch => {
return fetch('http://getuser.api')
.then(response => response.json())
.then(json => receiveUser(json));
}
Then in your root reducer where you include your redux-form reducer you would include your reducer plugin that overrides the forms values with the returned fetched data.
const formPluginReducer = {
form: formReducer.plugin({
// this would be the name of the form you're trying to populate
user: (state, action) => {
switch (action.type) {
case RECEIVE_USER:
return {
...state,
values: {
...state.values,
...action.payload.user
}
}
default:
return state;
}
}
})
};
const rootReducer = combineReducers({
...formPluginReducer,
...yourOtherReducers
});
Finally you include you combine your new formReducer with the other reducers in your app.
Note The following assumes that the fetched user object's keys match the names of the fields in the user form. If this is not the case you will need to perform an additional step on the data to map fields.
By default, you may only initialize a form component once via initialValues. There are two methods to reinitialize the form component with new "pristine" values:
Pass a enableReinitialize prop or reduxForm() config parameter set to true to allow the form the reinitialize with new "pristine" values every time the initialValues prop changes. To keep dirty form values when it reinitializes, you can set keepDirtyOnReinitialize to true. By default, reinitializing the form replaces all dirty values with "pristine" values.
Dispatch the INITIALIZE action (using the action creator provided by redux-form).
Referenced from : http://redux-form.com/6.1.1/examples/initializeFromState/
Could you fire the dispatch on componentWillMount(), and set the state to loading.
While it is loading, render a spinner for example and only when the request returns with the values, update the state, and then re-render the form with the values??
Here is minimal working example on how to set initialValues based on async source.
It uses initialize action creator.
All values from initialValues shouldn't be undefined, or you will get an infinite loop.
// import { Field, reduxForm, change, initialize } from 'redux-form';
async someAsyncMethod() {
// fetch data from server
await this.props.getProducts(),
// this allows to get current values of props after promises and benefits code readability
const { products } = this.props;
const initialValues = { productsField: products };
// set values as pristine to be able to detect changes
this.props.dispatch(initialize(
'myForm',
initialValues,
));
}
While this method may not be the best solution, it works well enough for my needs:
AJAX request to API on entry
Initializes form with data when request has been fulfilled or displays a server error
Resetting form will still reset to initial seed data
Allows the form to be reused for other purposes (for example, a simple if statement could bypass setting initial values): Add Post and Edit Post or Add Comment and Edit Comment...etc.
Data is removed from Redux form on exit (no reason to store new data in Redux since it's being re-rendered by a Blog component)
Form.jsx:
import React, { Component } from 'react';
import { Field, reduxForm } from 'redux-form';
import { connect } from 'react-redux';
import { browserHistory, Link } from 'react-router';
import { editPost, fetchPost } from '../../actions/BlogActions.jsx';
import NotFound from '../../components/presentational/notfound/NotFound.jsx';
import RenderAlert from '../../components/presentational/app/RenderAlert.jsx';
import Spinner from '../../components/presentational/loaders/Spinner.jsx';
// form validation checks
const validate = (values) => {
const errors = {}
if (!values.title) {
errors.title = 'Required';
}
if (!values.image) {
errors.image = 'Required';
}
if (!values.description) {
errors.description = 'Required';
} else if (values.description.length > 10000) {
errors.description = 'Error! Must be 10,000 characters or less!';
}
return errors;
}
// renders input fields
const renderInputField = ({ input, label, type, meta: { touched, error } }) => (
<div>
<label>{label}</label>
<div>
<input {...input} className="form-details complete-expand" placeholder={label} type={type}/>
{touched && error && <div className="error-handlers "><i className="fa fa-exclamation-triangle" aria-hidden="true"></i> {error}</div>}
</div>
</div>
)
// renders a text area field
const renderAreaField = ({ textarea, input, label, type, meta: { touched, error } }) => (
<div>
<label>{label}</label>
<div>
<textarea {...input} className="form-details complete-expand" placeholder={label} type={type}/>
{touched && error && <div className="error-handlers"><i className="fa fa-exclamation-triangle" aria-hidden="true"></i> {error}</div>}
</div>
</div>
)
class BlogPostForm extends Component {
constructor() {
super();
this.state = {
isLoaded: false,
requestTimeout: false,
};
}
componentDidMount() {
if (this.props.location.query.postId) {
// sets a 5 second server timeout
this.timeout = setInterval(this.timer.bind(this), 5000);
// AJAX request to API
fetchPost(this.props.location.query.postId).then((res) => {
// if data returned, seed Redux form
if (res.foundPost) this.initializeForm(res.foundPost);
// if data present, set isLoaded to true, otherwise set a server error
this.setState({
isLoaded: (res.foundPost) ? true : false,
serverError: (res.err) ? res.err : ''
});
});
}
}
componentWillUnmount() {
this.clearTimeout();
}
timer() {
this.setState({ requestTimeout: true });
this.clearTimeout();
}
clearTimeout() {
clearInterval(this.timeout);
}
// initialize Redux form from API supplied data
initializeForm(foundPost) {
const initData = {
id: foundPost._id,
title: foundPost.title,
image: foundPost.image,
imgtitle: foundPost.imgtitle,
description: foundPost.description
}
this.props.initialize(initData);
}
// onSubmit => take Redux form props and send back to server
handleFormSubmit(formProps) {
editPost(formProps).then((res) => {
if (res.err) {
this.setState({
serverError: res.err
});
} else {
browserHistory.push(/blog);
}
});
}
renderServerError() {
const { serverError } = this.state;
// if form submission returns a server error, display the error
if (serverError) return <RenderAlert errorMessage={serverError} />
}
render() {
const { handleSubmit, pristine, reset, submitting, fields: { title, image, imgtitle, description } } = this.props;
const { isLoaded, requestTimeout, serverError } = this.state;
// if data hasn't returned from AJAX request, then render a spinner
if (this.props.location.query.postId && !isLoaded) {
// if AJAX request returns an error or request has timed out, show NotFound component
if (serverError || requestTimeout) return <NotFound />
return <Spinner />
}
// if above conditions are met, clear the timeout, otherwise it'll cause the component to re-render on timer's setState function
this.clearTimeout();
return (
<div className="col-sm-12">
<div className="form-container">
<h1>Edit Form</h1>
<hr />
<form onSubmit={handleSubmit(this.handleFormSubmit.bind(this))}>
<Field name="title" type="text" component={renderInputField} label="Post Title" />
<Field name="image" type="text" component={renderInputField} label="Image URL" />
<Field name="imgtitle" component={renderInputField} label="Image Description" />
<Field name="description" component={renderAreaField} label="Description" />
<div>
<button type="submit" className="btn btn-primary partial-expand rounded" disabled={submitting}>Submit</button>
<button type="button" className="btn btn-danger partial-expand rounded f-r" disabled={ pristine || submitting } onClick={ reset }>Clear Values</button>
</div>
</form>
{ this.renderServerError() }
</div>
</div>
)
}
}
BlogPostForm = reduxForm({
form: 'BlogPostForm',
validate,
fields: ['name', 'image', 'imgtitle', 'description']
})(BlogPostForm);
export default BlogPostForm = connect(BlogPostForm);
BlogActions.jsx:
import * as app from 'axios';
const ROOT_URL = 'http://localhost:3001';
// submits Redux form data to server
export const editPost = ({ id, title, image, imgtitle, description, navTitle }) => {
return app.put(`${ROOT_URL}/post/edit/${id}?userId=${config.user}`, { id, title, image, imgtitle, description, navTitle }, config)
.then(response => {
return { success: response.data.message }
})
.catch(({ response }) => {
if(response.data.deniedAccess) {
return { err: response.data.deniedAccess }
} else {
return { err: response.data.err }
}
});
}
// fetches a single post from the server for front-end editing
export const fetchPost = (id) => {
return app.get(`${ROOT_URL}/posts/${id}`)
.then(response => {
return { foundPost: response.data.post}
})
.catch(({ response }) => {
return { err: response.data.err };
});
}
RenderAlert.jsx:
import React, { Component } from 'react';
const RenderAlert = (props) => {
const displayMessage = () => {
const { errorMessage } = props;
if (errorMessage) {
return (
<div className="callout-alert">
<p>
<i className="fa fa-exclamation-triangle" aria-hidden="true"/>
<strong>Error! </strong> { errorMessage }
</p>
</div>
);
}
}
return (
<div>
{ displayMessage() }
</div>
);
}
export default RenderAlert;
Reducers.jsx
import { routerReducer as routing } from 'react-router-redux';
import { reducer as formReducer } from 'redux-form';
import { combineReducers } from 'redux';
const rootReducer = combineReducers({
form: formReducer,
routing
});
export default rootReducer;
use this :
UpdateUserForm = reduxForm({
enableReinitialize: true,
destroyOnUnmount: false,
form: 'update_user_form' // a unique identifier for this form
})(UpdateUserForm);
UpdateUserForm = connect(
(state) => ({
initialValues: state.userManagment.userSingle
})
)(UpdateUserForm);
export default UpdateUserForm;