I have a stateless React function to render a react-select Select to a form. Everything else works nicely with redux-form except when redux-form is reset. I need to reset the form manually after successful post.
onChange and onBlur change the redux-form value correctly when Select has a value change. When I reset the redux-form, the redux-form value is cleared but the Select will have the old value.
function SelectInput(props) {
const { input, options, label } = props;
const { onChange, onBlur } = input;
const handleChange = ({ value }) => {
onChange(value);
};
const handleBlur = ({ value }) => {
onBlur(value);
};
return (
<FormField {...props}>
<Select placeholder={label} options={options} onChange={handleChange} onBlur={handleBlur} />
</FormField>
);
}
I converted the SelectInput to React.PureComponent, and added the value as a state inside the component and looked for when the Component received new props:
constructor(props) {
super(props);
this.state = {value: ''}
}
componentWillReceiveProps(nextProps){
this.setState({value: nextprops.input.value})
}
<Select value={this.state.value} placeholder={label} options={options} onChange={handleChange} onBlur={handleBlur} />
With this Select was not able to show the value at all.
The problem is that how I can update the Select to show empty value when redux-form that this field is part of is reset? Redux-form resets the value corretly inside the redux state and if I try to submit the form, validation notices that that Select has empty value. The Select will however display the old value so that user thinks that there is a value selected.
Reset is done by dispatching reset in the actual redux-form component. Redux devtools show that fields are reset and the redux state is cleared from all the value, Select component just won't update the DISPLAYED value to empty.
const afterSubmit = (result, dispatch) =>
dispatch(reset('datainputform'));
export default reduxForm({
form: 'datainputform',
onSubmitSuccess: afterSubmit,
})(DataInputForm);
Versions I use:
react-select#v2.0.0-beta.6
redux-form#7.3.0
You can also set a key at the form level itself. The key will take a unique value that you can store in the component state. This unique value will be updated every time reset is hit.
state = {
unique_key: ''
}
// this is the onClick handler for reset button on the form
onResetForm = () => {
reset_val = Date.now();
this.props.reset();
this.setState({unique_key: reset_val});
}
<Form actions={action_func}, key={this.state.unique_key}/>
Now whenever reset is clicked, the handler will update the unique_key. This will result in re-rendering the Form with the default values. The handler also calls the form reset function to clear the redux.
Got it working. Problem was handling the Select null value. Changed stateless function to PureComponent, added the value to state.
constructor(props) {
super(props);
this.state = { value: '' };
}
Redux-form changes the react-select value by sending new props. So added
componentWillReceiveProps(nextProps) {
if (nextProps.input.value === '') {
this.setState({ value: '' });
}
}
Added setState to handleChange:
handleChange = (data) => {
const value = data === null ? '' : data;
this.setState({ value });
this.props.input.onChange(data.value);
};
And then added the value prop.
<Select value={this.state.value}...
Related
I have a component called Test that receives 2 props: CurrentPage and OnPageRequest: (currentPage: number) => void
When the parent component uses Test, it sets the Current page number in its state. As you update, the input field below, that value gets fed back up to the parent component via the OnPageRequest as:
OnPageRequest(e.target.value);
wherein return, the parent component updates its current page number in the state.
Test component:
const handlePageNumberBlur = (e) => {
OnPageRequest(e.target.value);
}
render() {
return (
<input
title="Current Page"
onBlur={handlePageNumberBlur}
aria-label="Current Page"
min="1"
max={TotalPages}
placeholder="1"
type="number"
value={this.props.CurrentPage} />
)
}
I'm trying to write Test in such a way so that it only fires back the newly inputted value only when the onBlur event is triggered. But I've learned that with the above code, it never updates the value. It only does it if I have an onChange event where I do: OnPageRequest(e.target.value);
How can I get it to change only when onBlur fires?
SAMPLE: https://codesandbox.io/s/kumuc
Try using defaultValue instead of value. The defaultValue prop only sets the value to the input on initial render and you won´t need to keep it updated if the value of the prop changes.
<input
{ ... }
defaultValue={this.prop.CurrentPage}
/>
But this can also be an issue if you set CurrentPage after the input has rendered, which depends on where you get your initial value for the prop.
If you need to keep the input updated after the first render, you can update its value using Refs and the componentDidUpdate lifecycle method.
class TestComponent extends React.Component {
constructor(props) {
super(props);
this.inputRef = React.createRef();
}
componentDidUpdate(prevProps) {
if (this.inputRef.current.value != this.props.CurrentPage) {
this.inputRef.current.value = this.props.CurrentPage;
}
}
/* ... */
render() {
return <input
{ ... }
defaultValue={this.props.CurrentPage}
ref={this.inputRef}
/>
}
}
I'm currently working a a multipage checklist app to make a common checklist procedure more efficient.
my parent component called MainForm has all of the states for my app. In my first child element, I had to fill some text inputs. The states are updating and saving as planned. My second page (or other child element) was the portion where my checklist would begin. The issue is my app is rending, but the radiobutton value isn't being sent to my state. I'm also having an issue where I can select the 'yes' radio button and then the 'no' radio button, but I can't go from 'no' to 'yes'. radioGroup21 is the radio group that's giving me problem. All other states are working.
I'm getting an error in my console that says:
"Checkbox contains an input of type radio with both value and defaultValue props. Input elements must be either controlled or uncontrolled (specify either the value prop, or the defaultValue prop, but not both). Decide between using a controlled or uncontrolled input element and remove one of these props.
I've tried removing the value tag and the defaultValue line in my Radio elements, but no luck. I've tried creating constructor(props) in my parent element but I still kept having issues."
So far I've tried removing the defaultValue in my radio button and after I tried removing the value line. Unfortunately I this did not help.
I also read about controlled and uncontrolled inputs. I've tried changing my parent components state to put them in a constructor(props) bracket. But no luck.
I also tried to not use the handleChange function and use the setState function with values of {radioButton21 === 'yes'} but that didn't work.
//Parent Component
Class MainForm extends Component {
state = {
step: 1,
projectNumber: '',
projectName: '',
numberOfSystems: '',
buildSheet: '',
controlPhilosophy: '',
projectLayoutDrawing: '',
projSoftwareValidation: '',
CppDrawing: '',
radioGroup21: '',
}
nextStep = () => {
const { step } = this.state
this.setState({
step : step + 1
})
}
prevStep = () => {
const { step } = this.state
this.setState({
step : step - 1
})
}
handleChange = input => event => {
this.setState({ [input] : event.target.value })
}
render(){
const {step} = this.state;
const { projectNumber, projectName, numberOfSystems, buildSheet , controlPhilosophy, projectLayoutDrawing, projSoftwareValidation, CppDrawing, radioGroup21 } = this.state;
const values = { projectNumber, projectName, numberOfSystems, buildSheet, controlPhilosophy, projectLayoutDrawing, projSoftwareValidation, CppDrawing, radioGroup21 };
switch(step) {
case 1:
return <ProjectInfo
nextStep={this.nextStep}
handleChange = {this.handleChange}
values={values}
/>
case 2:
return <PrelimInspection
nextStep={this.nextStep}
prevStep={this.prevStep}
handleChange = {this.handleChange}
values={values}
/>
export default MainForm;
-----------------------------------
//Child Component
import React, { Component } from 'react';
import { Form, Button, Radio } from 'semantic-ui-react';
import { throws } from 'assert';
class PrelimInspection extends Component{
saveAndContinue = (e) => {
e.preventDefault();
this.props.nextStep();
}
back = (e) => {
e.preventDefault();
this.props.prevStep();
}
render(){
const { values } = this.props
return(
<Form color='blue' >
<h1 className="ui centered">System Installation</h1>
<Form.Field inline>
<Form.Field>System Properly Supported</Form.Field>
<Radio
label = {'Yes'}
name = {'radio21'}
value = {'Yes'}
onChange={this.props.handleChange('radioGroup21')}
defaultValue={values.radioGroup21}
/>
<Radio
label = {'No'}
name = {'radio21'}
value = {'No'}
onChange={this.props.handleChange('radioGroup21')}
defaultValue={values.radioGroup21}
/>
</Form.Field>
<Button onClick={this.back}>Back</Button>
<Button onClick={this.saveAndContinue}>Save And Continue </Button>
</Form>
)
}
}
export default PrelimInspection
The app is rendering and the layout is correct. Unfortunately the state values aren't being sent to the parent state.
I checked the documentation https://react.semantic-ui.com/addons/radio/#types-radio-group and I have found few things you missed:
1.) Radio component asked the checked props (but you did not supply it).
2.) Which then requires you to pass the value, in your case it should come from the parent component:
<PrelimInspection
valueFromParent={this.state["radioGroup21"]}
nextStep={this.nextStep}
handleChange={this.handleChange}
values={values}
/>
so in your Child Component' render, take the value:
render() {
const { values, valueFromParent } = this.props;
...
3.) Radio's onChange value is passed as the second param (obj.value).
<Radio
label={'Yes'}
name={'radio21'}
value={"Yes"}
checked={valueFromParent === 'Yes'}
onChange={this.props.handleChange("radioGroup21")}
...
/>
So you can take the selected value like this:
// MainForm
handleChange = input => (event, obj) => { // obj is the second param
console.log("sendin here", input, obj.value);
this.setState({ [input]: obj.value });
};
I am developing a React JS application. What I am doing now is I am fetching data asynchronously from the server and render the values in the TextField. I know how to do it and my approach is working as well. But, I just do not like my current approach.
This is the working approach
class TestComponent extends React.Component {
constructor(props)
{
super(props);
this.fetchName = this.fetchName.bind(this);
this.handleChange = this.handleChange.bind(this);
this.state = {
name : ''
}
}
fetchName()
{
//get the name asynchronously from the server. I am using Axios
this.setState({ name : nameValueFromTheServer })
}
handleChange(e)
{
this.setState({ name : e.target.value })
}
render()
{
return (
<MuiThemeProvider>
<div>
<TextField onChange={this.handleChange} label="Name" value={this.state.name} />
</div>
</MuiThemeProvider>
)
}
}
The thing I do not like about above approach is that I have to implement handleChange method to retrieve the value of the input value. If I do not implement it, I cannot change the name input value because the state value is not changed. To retrieve a simple input value, I have to write extra lines of code. In jQuery, I just retrieve the input value like this, $(selector).val(). Without implementing the handleChange method, I can use the ref like this.
<TextField inputRedf={(input) => this.tfName = input } label="Name" />
Then I retrieve the value dynamically like this.
this.tfName.value
The problem with using the reference is setting the default value which is fetched asynchronously from the server.
I can set the default value like this to the TextField
<TextField inputRedf={(input) => this.tfName = input } defaultValue={this.state.name} label="Name" />
Pay attention to the defaultValue attribute in the above code. When I set the value using defaultValue, the initial value of the name state will be set to the text field. But we can still change the input value of the name typing in from the UI even if we do not implement the handleChange event. But the problem is that I am getting the data asynchronously and setting the this.state.name dynamically.
So in the component constructor, the name state is empty. Then I set it in the callback of the asynchronous call. But the defaultValue can be set only once. So the input field is always showing empty. What I like to know is, how can I set the defaultValue of the TextField dynamically? The reason I am using ref is that I do not want to implement the onChange event as well to track state the reset the input value. If I could set the defaultValue dynamically, I will just the value dynamically in the callback of the asynchronous call. What is the best solution to simplify this scenario?
You don't need default value actually. If you want to avoid using onChange handler you can imperatively set input value in async callback:
class TestComponent extends React.Component {
constructor(props) {
super(props);
this.fetchName = this.fetchName.bind(this);
this.handleChange = this.handleChange.bind(this);
}
fetchName() {
if(this.tfName.value == '') {
// only update if user have not changed the input value.
this.tfName.value = nameValueFromTheServer;
}
}
render() {
return (
<MuiThemeProvider>
<div>
<TextField
inputRef={(input) => this.tfName = input }
label="Name"/>
</div>
</MuiThemeProvider>
);
}
}
I use Redux Form Version 6.8.0.
I have a form component which get's it's "initialValues" via a "mapStateToProps" function. On the first render everything works quite fine.
Following my form config:
const CategoryChangeForm = reduxForm({
form: 'change-category',
validate: newCategoryValidate,
enableReinitialize: true
})(CategoryChange);
When i change the Field "category" and the update succeed, i receive the new updated value from firebase.
I pass this updated value via the mentioned "mapStateToProps" function to the "initialValues":
function mapStateToProps(state, ownProps) {
return {
initialValues: { category: state.categories[ownProps.id].name, id: ownProps.id }
};
}
I expected that the new Value would be applied to the "category"-Field Component. But it doesn't get the updated value.
The config of my "Field" Components:
const fieldProps = {
category: {
name: 'category',
type: 'text',
placeholder: 'Bezeichnung',
component: InputField
},
hidden: {
name: 'id',
type: 'hidden',
component: 'input'
}
};
and here is my Form Component:
export const CategoryChange = props => {
const {
color,
message,
handleSubmit,
stateComponent
} = props;
console.log("Props: ", props);
return (
<span>
<Subline color={ color } marginTop={ 70 } marginBottom={ 30 } align="center">{ message }</Subline>
<form>
<Field { ...fieldProps.category } />
<Field { ...fieldProps.hidden } />
<Button onClick={ handleSubmit(changeCategory.bind(stateComponent)) }>Ändern</Button>
<Button marginBottom={ 5 } marginTop={ 10 }>Löschen</Button>
</form>
</span>
);
}
I can observe that after an update, my form component rerenders 2 times. First time its prop "initialized" is set to "true". But the second time its set to "false".
The second render occurs due to a stateChange of the hoc component which wrapped my form component. The "setState" for the hoc is triggered when the update was successful and show an appropriate message to the user.
But cause of the second render the form component did not initialize.
If you need any more code to see, let me know.
Hope someone has a hint to solve this problem...
According to the docs:
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).
You can change CategoryChangeForm from function to class and call initialize action from redux-forms in the componentWillReceiveProps method.
import {initialize} from 'redux-form'
CategoryChangeForm extends Component {
...
componentWillReceiveProps(nextProps) {
// check the props and call initialize when needed
}
}
mapDispatchToProps = dispatch => ({
initialize: (data) => initialize('change-category', data)
})
How can I get the value of datapicker in react toobox?
I am using custom components.
I am using 2 components first one is called InputDateCustom.js with the code below:
import DatePicker from 'react-toolbox/lib/date_picker/DatePicker';
import React, { Component } from 'react';
const datetime = new Date(2015, 10, 16);
datetime.setHours(17);
datetime.setMinutes(28);
export default class InputDateCustomizado extends Component{
state = {date2: datetime};
handleChange = (item, value) => {
console.log(item+" - "+value)
this.setState({...this.state, [item]: value});
};
render() {
return (
<div>
<DatePicker
label={this.props.label}
locale={localeExample}
name={this.props.name}
required={this.props.required}
onChange={this.handleChange.bind(this, 'date1')}
value={this.state.date1}
/>
</div>
);
}
}
Another component is called Cadastro.js that contains the following logic:
constructor(props) {
super(props);
this.state = {msg: '', fim_vigencia:'', nome:''}
this.setNome = this.setNome.bind(this)
this.setFimVigencia = this.setFimVigencia.bind(this)
}
setFimVigencia(evento){
console.log("date")
this.setState({fim_vigencia:evento.target.value});
}
InputDateCustomizado
id="fim_vigencia"
label="Fim"
name="fim_vigencia"
value = {this.state.fim_vigencia}
onSubmit = {this.setFimVigencia}
/>
Get the value in an onChange event or using the value prop. Doc examples: http://react-toolbox.com/#/components/date_picker
<DatePicker label='Birthdate' onChange={this.handleChange.bind(this, 'date1')} value={this.state.date1} />
You can get access to the value in the handleChange event allowing you to update your state with the currently selected date.
EDIT: Ah okay I think I understand what you are asking now. You have wrapped DatePicker with your own component and now you want to get the DatePicker value through the Cadastro.js component.
You need to create a method in the Cadastro.js that accepts state changes from the InputDateCustomizado component and then pass that function as a prop to the InputDateCustomizado component. In the InputDateCustomizado when the state changes, call the passed in function and it should update the state in the parent component. Then you will always have the datepicker value in the parent component.
It looks like you are almost there. You need to add an updateState function to the Cadastro.js component. In the InputDateCustomizado component handleChange event, you need to call this.props.updateState and pass in the new value.
In Cadastro.js
updateState = (data) => {
this.setState({
date: data.data //set your state here to the date
})
}
In InputDateCustomizado
handleChange = (item, value) => {
console.log(item+" - "+value)
this.setState({...this.state, [item]: value});
this.props.updateState(this.state);
};