Develop Reference

input target value from child component

I've managed to get my input component to render onto the dom, however I'm having a bit of trouble accessing the props.
Functional input component
const InputField = props => {
const { inputValue, updateInputValue } = props
return (
<Input>
<input
type="text"
placeholder="Please specify"
value={inputValue}
onChange={updateInputValue}
/>
<hr />
<label>Other</label>
</Input>
)
}
The component is only rendered to the dom based on an object property inside of an array
const MultiChoiceQuestions = props => {
const { multiChoiceArray, handleClick } = props
return (
<ButtonContainer>
{multiChoiceArray.map(questionChoice => {
if (questionChoice.type === 'input') {
return <InputField />
}
return (
<Button type="button" key={questionChoice.id} onClick={() => handleClick(questionChoice)}>
{questionChoice.text}
</Button>
)
})}
</ButtonContainer>
)
}
The multiChoice component is imported once again to create a top-level component that the app consumes
const Question = props => {
let responses
switch (props.data.type) {
case 'multiChoice':
responses = (
<MultiChoiceQuestions
multiChoiceArray={props.data.choices}
handleClick={props.handleClick}
inputValue={props.inputValue}
updateInputValue={props.updateInputValue}
/>
)
break
default:
responses = <div>Error: no question type: `{props.data.type}`</div>
}
const { data } = props
return (
<AnimatedDiv key={data.id}>
<QuestionText>{data.text}</QuestionText>
{responses}
</AnimatedDiv>
)
}
And the final component looks like this
class Survey extends Component {
constructor(props) {
super(props)
this.state = {
currentQuestionId: 1,
userAnswers: [],
isActive: false,
inputValue: '',
}
this.selectAnswer = this.selectAnswer.bind(this)
this.test = this.test.bind(this)
}
selectAnswer = answer => {
this.setState(state => ({
currentQuestionId: state.currentQuestionId + 1,
userAnswers: state.userAnswers.concat([answer]),
isActive: !state.isActive,
}))
}
checkInput = event => {
this.setState({
inputValue: event.target.value,
})
}
test = event => {
console.log(event.target.value)
}
render() {
const { currentQuestionId, isActive, inputValue } = this.state
const { questions } = this.props
const currentPercentage = (currentQuestionId * 100) / questions.length
return (
<SurveyContainer>
<Question
data={questions.find(q => q.id === currentQuestionId)}
className={isActive ? 'active' : ''}
handleClick={this.selectAnswer}
value={inputValue}
onChange={this.test}
/>
</SurveyContainer>
)
}
}
The InputField component renders out just fine, however, the function for my onChange event is not firing...There's a mistake somewhere in the pipeline, probably inside the question component?

It looks like you haven't passed any props to <InputField /> in your MultiChoiceQuestions component.

I can not see where you pass props from
<MultiChoiceQuestions>
...
<InputFiled props={props} />
...
</MultiChoiceQuestions>
Probably pass only the props which are needed in InputField component, such as inputValue, updateInputValue:
<InputFiled
inputValue={inputValue}
updateInputValue={updateInputValue}
/>
const InputField = (inputValue, updateInputValue) => {
...
<input
type="text"
placeholder="Please specify"
value={inputValue}
onChange={(e) => updateInputValue(e)}
/>
...
}
Hope that will help.

How can I handle deleting an item from list through a modal rendered in the layout(top level)?

I am rendering my modal in my layout and the modal's functionality is to delete a list item in my todo list. How can I pass that handle delete function to the modal?
class TODO extends Component {
handleDelete = (id) => {
const newArr = this.state.TODOList.filter((item, idx) => {id !==
idx})
this.setState({ TODOList: newArr });
}
render () {
return this.state.TODOList.map((item, id) =>
<div>
<ITEMS
idx={id}
id={id}
/>
</div>
)
}
}
class myModal extends Component {
render () {
return (
<div>
<button onClick={...???....}> Delete </Button>
</div>
)
}
}
class Layout extends Component {
render () {
return (
<div>
<myModal />
</div>
)
}
}

You can pass the function down as props
class TodoList extends Component {
constructor () {
this.setState({ TODOList: [...] })
}
handleDelete = (id) => {
const newArr = this.state.TODOList.filter((item, idx) => {id !==
idx})
this.setState({ TODOList: newArr });
}
render() {
return (
<div className="container">
{ return this.TODOList.map(todo, idx => { <TODO idx={idx} /> }) }
<Modal handleDelete={this.handleDelete} />
</div>
)
}
}
class myModal extends Component {
constructor(props) {
super(props)
}
render () {
return (
<div>
<button onClick={() => this.handleDelete(this.idx)}> Delete </Button>
</div>
)
}
}
class Layout extends Component {
render () {
return (
<div>
<myModal handleDelete={this.handleDelete} />
</div>
)
}
}

First you should add <TODO> as child of <Layout>. You can set its ref='todo'.Create a handleDelete in <Layout>. Call the handleDelete of todo using its ref. And pass handleDelete in props of <myModal>. This is for the case when you want to have a state for TODO
class TODO extends Component {
handleDelete = (id) => {
const newArr = this.state.TODOList.filter((item, idx) => {id !==idx})
this.setState({ TODOList: newArr });
}
}
class myModal extends Component {
state = {idToDelete : 2}
render () {
return (
<div>
<button onClick={() => this.props.handleDelete(this.state.idToDelete)}> Delete </Button>
</div>
)
}
}
class Layout extends Component {
render () {
return (
<div>
<myModal handleDelete={handleDelete} />
<TODO ref="todo" />
</div>
)
}
handleDelete = (id) =>{
this.refs.handleDelete(id);
}
}

i cant transfer data from react child to parent ang during click on child set value of input in parent

it is my first React App
i want create simple typeahead(autocomplete)
i want when i click on searched list of item, this item will show in value of my Parent input
now my click doesnt work, working only search by name
it is my parent
`
import React, { Component } from 'react';
import logo from './logo.svg';
import './Search.css';
import Sugg from './Sugg';
class Search extends Component {
constructor(props) {
super(props);
this.onSearch = this.onSearch.bind(this);
this.handleClickedItem = this.handleClickedItem.bind(this);
this.onClick = this.onClick.bind(this);
this.state = {
companies: [],
searchedList: [],
value: ''
}
}
componentDidMount() {
this.fetchApi();
console.log(this.state.companies);
}
fetchApi = ()=> {
const url = 'https://autocomplete.clearbit.com/v1/companies/suggest?query={companyName}';
fetch(url)
.then( (response) => {
let myData = response.json()
return myData;
})
.then((value) => {
let companies = value.map((company, i) => {
this.setState({
companies: [...this.state.companies, company]
})
})
console.log(this.state.companies);
});
}
onSearch(arr){
// this.setState({companies: arr});
};
handleInputChange = () => {
console.log(this.search.value);
let searched = [];
this.state.companies.map((company, i) => {
console.log(company.name);
console.log(company.domain);
const tempName = company.name.toLowerCase();
const tempDomain = company.domain.toLowerCase();
if(tempName.includes(this.search.value.toLowerCase()) || tempDomain.includes(this.search.value.toLowerCase())) {
searched.push(company);
}
})
console.log(searched);
this.setState({
searchedList: searched
})
if(this.search.value == '') {
this.setState({
searchedList: []
})
}
}
handleClickedItem(data) {
console.log(data);
}
onClick = e => {
console.log(e.target.value)
this.setState({ value: e.target.value});
};
render() {
return (
<div className="Search">
<header className="Search-header">
<img src={logo} className="Search-logo" alt="logo" />
<h1 className="Search-title">Welcome to React</h1>
</header>
<form>
<input
placeholder="Search for..."
ref={input => this.search = input}
onChange={this.handleInputChange}
/>
<Sugg searchedList={this.state.searchedList} onClick={this.onClick.bind(this)} />
</form>
</div>
);
}
}
export default Search;
`
and here my child component
i dont know how call correctly click event
import React from 'react';
const Sugg = (props) => {
console.log(props);
const options = props.searchedList.map((company, i) => (
<div key={i} >
<p onClick={() => this.props.onClick(this.props)}>{company.name}</p>
</div>
))
console.log(options);
return <div >{options}</div>
}
export default Sugg;
please help me who knows how it works
thanks a lot

In the parent you could modify your code:
onClick = company => {
console.log('company', company);
this.setState({ value: company.name});
};
and you don't need to bind this because onClick is an arrow function
<Sugg searchedList={this.state.searchedList} onClick={this.onClick} />
and in the child component, you need to use props from the parameters, not from the this context:
<p onClick={() =>props.onClick(company)}>{company.name}</p>

How to Update This Reactjs Select

I have this wrapper class that is used because I am using Formik and the FieldArray
import React, { Component } from "react";
import { ReactDOM } from "react-dom";
import Select from "react-select";
import { observer } from "mobx-react";
import { axiosInstance } from "../stores/AxiosInstance";
#observer
export default class CountryStateSelectComponent extends React.Component {
constructor(props) {
super(props);
this.state = { stateOptions: [] };
}
handleCountryChange = value => {
const that = this;
axiosInstance
.get(`/States?countryId=${value.value}`)
.then(function(response) {
that.props.onChange(that.props.countryName, value);
that.props.onChange(that.props.stateName, null);
const states = response.data.map(state => {
return { label: state.name, value: state.id };
});
// if I move out state select code then won't need to update state here but don't know how to call something like updateState(record)
that.setState({
stateOptions: states
});
});
};
handleStateChange = value => {
console.log(this.props.stateName, value)
this.props.onChange(this.props.stateName, value);
};
handleCountryBlur = () => {
this.props.onBlur(this.props.countryName, true);
};
handleStateBlur = () => {
this.props.onChange(this.props.stateName, true);
};
render() {
const props = this.props;
return (
<React.Fragment>
<div className="field">
<label className="label">Country</label>
<div className="control">
<Select
options={props.options}
isMulti={props.isMulti}
onChange={this.handleCountryChange}
onBlur={this.handleCountryBlur}
closeMenuOnSelect={props.closeMenuOnSelect}
/>
{this.props.CountryError}
</div>
</div>
<div className="field">
<label className="label">State/Province</label>
<div className="control">
<Select
options={this.state.stateOptions}
onChange={this.handleStateChange}
onBlur={this.handleStateBlur}
/>
{this.props.StateError}
</div>
</div>
</React.Fragment>
);
}
}
However what I found is that when the State gets selected the value does not get stored in Formik(it gets stored as undefined and sometimes true).
So now I am thinking maybe moving out the State Zip out and making it's own wrapper or something but I don't know how to get the "states" that came back and populate the correct state box as they can generate many.
#inject("AccountSetupStore")
#observer
export default class MyComponent extends Component {
constructor(props) {
super(props);
this.state = { records: [this.generateRecord(1, true, true)] };
}
componentDidMount() {
const accountSetupStore = this.props.AccountSetupStore;
accountSetupStore.getCountries();
}
updateState(record) {
// would like to call this method that can somehow update the record
// propblem is I don't seem to have access to props when this function is being called from the CountryStateSelectComponent
}
render() {
const props = this.props;
const accountSetupStore = props.AccountSetupStore;
const countries = [];
for (const country of accountSetupStore.countries) {
countries.push({ value: country.id, label: country.name });
}
return (
<section className="accordions">
<Formik
initialValues={{
records: this.state.records
}}
onSubmit={(
values,
{ setSubmitting, setErrors}
) => {
console.log(values,"values");
}}
validationSchema={Yup.object().shape({
branches: Yup.array()
.of(
Yup.object().shape({
})
)
})}
render={({
values,
setFieldValue,
setFieldTouched,
}) => (
<FieldArray
name="records"
render={arrayHelpers => (
<Form>
{values.records.map((record, index) => {
return (<article}>
<CountryStateSelectComponent options={countries}
onChange={setFieldValue}
countryName={`records[${index}].selectedCountry`}
stateName={`records[0].selectedState`}
onBlur={setFieldTouched}
isMulti={false}
index = {index}
closeMenuOnSelect={true}
CountryError = {<ErrorMessage name={`records[${index}].selectedCountry`}/>}
StateError= {<ErrorMessage name={`records[${index}].selectedState`}/>}
/>
</article>)
})}
</Form>
)}
/>
)}
/>
</section>
);
}
}

React Select onChange sends the value to the method supplied
const onStateChange = (selectedOption, {action}) => {
//do something with the selectedOption according to the action
}
<Select onChange={onStateChange} />
See the documentation for the onChange in the Props documentation.

defaultValue is pulling the last value in React

If i click on a particular ToDos edit button, its value should be defaulted inside the textarea but everytime the last ToDo is defaulting, can somebody please help, whether using ref is a right choice or something else, then where i m wrong what i'm suppose to do ?
handleEdit() {
e.preventDefault();
.....
}
renderDisplay() {
return(
<div>
{
this.props.listArr.map((list,i) => {
return(
<div key={i} index={i} ref="newText">
<li>{list}
<div>
<button className="btn btn-primary btn-xs glyphicon glyphicon-pencil"
onClick={this.handleEdit.bind(this)}
/>
</div>
<hr/>
</li>
</div>
)})
}
</div>
);
}
renderForm() {
return(
<div>
<textarea className="form-control" defaultValue={this.refs.newText.innerText} rows="1" cols="100" style={{width: 500}}/>
</div>
)
}
render() {
if(this.state.editing) {
return this.renderForm();
}else {
return this.renderDisplay();
}
}
}

First of all you are using an old ref API. You should use this one, where you set the ref to the instance of the class using this with a callback.
<input ref={ref => {this.myInput = ref}} />
And then you can access its value by just referring to this.myInput .
As for your "bug", keep in mind that you are looping over and overriding the ref. so the last ref assignment would be the last item in the array.
this.props.listArr.map((list,i) => {
return(
<div key={i} index={i} ref="newText">
<li>{list}
There will always be 1 newText ref and it will always be the last item in the array.
You should render different ref names according to the item id and then pass the id of the item to the renderForm so it can access the relevant ref.
With that said, i really recommend to extract the todo to a different component as well as the form. I don't see a valid reason to use refs in this case.
Edit
As a follow-up to your comment, here is a small example of how you would use components instead of refs in order to get information from the child like values etc..
class Todo extends React.Component {
onClick = () => {
const { todoId, onClick } = this.props;
onClick(todoId);
}
render() {
const { value, complete } = this.props;
return (
<div
style={{ textDecoration: complete && 'line-through' }}
onClick={this.onClick}
>
{value}
</div>
);
}
}
class App extends React.Component {
constructor(props) {
super(props);
this.state = {
todos: [
{ id: '1', value: 'to do this', complete: false },
{ id: '2', value: 'todo that', complete: true },
{ id: '3', value: 'will do it later', complete: false }]
}
}
toggleTodo = (todoId) => {
const { todos } = this.state;
const nextState = todos.map(todo => {
if (todo.id !== todoId) return todo;
return {
...todo,
complete: !todo.complete
}
});
this.setState({ todos: nextState });
}
render() {
const { todos } = this.state;
return (
<div >
{
todos.map((todo) => {
return (
<Todo
complete={todo.complete}
key={todo.id}
todoId={todo.id}
value={todo.value}
onClick={this.toggleTodo}
/>
)
})
}
</div>
);
}
}
ReactDOM.render(<App />, document.getElementById('root'));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id="root"></div>