Tags down


Reactjs class components not rendered but functions are rendered in IE11

By : Kunal Bajaj
Date : October 18 2020, 06:10 AM
seems to work fine In React we write ES6 code that is newer version of java script, and some of older browser don't support it, due to that we need babel (a javascript compiler) so our jsx can be compiled into plain javascript.
you can learn more about bable from here.
code :

Share : facebook icon twitter icon

Component's onChange function being passed the last parameter value when the ReactJS components are rendered from an arr

By : vekye hakiy
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I got the expected behavior when replacing the fat arrow function in onChange with the following code.
code :
onChange={this.inputChange.bind(this, name)}

Pagination gets rendered for all views but it should be rendered only on home page in ReactJS?

By : Aoilyra
Date : March 29 2020, 07:55 AM
I wish this help you You should approach toggling pagination the same way you did for showing match information. Hold a variable in this.state for your Layout component and make a method that will control that this.state variable. Pass that method down to your child component. Here is a barebones example:
code :
class Layout extends Component {
    this.state = {
      showPagination: true

  onChangePagination = () => {
    this.setState({showPagination: !this.state.showPagination}) //toggles pagination

  render() {
    return (
          <Pagination onChangePagination={this.onChangePagination}/>
          <button onClick={this.onChangePagination}>
            show pagination


class Pagination extends Component {
  handleClick() {

  render() {
    return (
        <button onClick={this.handleClick}>
          toggle pagination

ReactJS, incrementing/decrementing a rendered value with rendered buttons

By : sqba
Date : March 29 2020, 07:55 AM
seems to work fine
Still wondering how will I target the appropriate row with the appropriate button.
code :
class GeneratedWorkout extends React.PureComponent {

    state = {
        // init state from props
        reps: Array(this.props.workouts.length).fill(Math.floor(Math.random() * 11) + 5),

    decreaseReps = index => {
        this.setState(prevState => {
            const reps = prevState.reps.slice();
            reps[index] = reps[index] - 1;
            return {reps};

    increaseReps = index => {/* implement accordingly */}

    renderRows = () => {
        return this.props.workouts.map((item, index) => {
            return (
                <Table.Row key={item.name}>
                        <Button.Group compact size="mini">
                            <Button onClick={() => this.decreaseReps(index)} icon="minus" />;
                            <Button onClick={() => this.increaseReps(index)} icon="plus" />;

Reactjs assigning key prop to array rendered components

By : Phanindra Bitla
Date : March 29 2020, 07:55 AM
Does that help If you don't have an id in item, you can use the item array index if the list will not be reordered or reorganized :
code :
this.state.Store.City.map((item, index) => {
   return (
     <View key={index}>
      <TouchableOpacity onPress={() => this.onQueryInputChange(item)}>
        <Text style={{ fontSize: 20, paddingVertical: 10 }}>

ReactJS How to use Refs on components rendered dinamically by another render function to focus elements?

By : user3566146
Date : March 29 2020, 07:55 AM
it should still fix some issue you should use the createRefmethod of each button that you would like to focus, also you have to pass this ref to the focusElement method that you have created:
code :
const myList = [
  { id: 0, label: "label0" },
  { id: 1, label: "label1" },
  { id: 2, label: "label2" },
  { id: 3, label: "label3" },
  { id: 4, label: "label4" },
  { id: 5, label: "label5" }

export default class App extends React.Component {
  state = {
    items: myList,
    //This is the list of refs that will help you pick any item that ou want to focus
    myButtonsRef: myList.map(i => React.createRef(i.label))

  // Here you create a ref for each button
  renderList = () => {
    return this.state.items.map(i => (
      <button key={i.id} ref={this.state.myButtonsRef[i.id]}>

  //Here you pass the ref as an argument and just focus it
  focusElement = item => {

  render() {
    return (
          onClick={() => {
            //Here you are able to focus any item that you want based on the ref in the state
          Focus the item 0

Related Posts Related Posts :
  • Loading spinner with react useEffect hook and Redux and without useState hook
  • Jest - Could not locate module with dynamic import template string
  • can i use the tsx extension for test files if using react with typescript
  • Material-ui: Difference between Expansion Panels and Collapse
  • When should I use a this.context vs Consumer in the New Context API in React?
  • Dynamic Component with React Router
  • How to inherit vanilla option component in a custom option component in react-select v2?
  • Is there a way to see the query produced by ReactiveSearch
  • How to describe type scroll events?
  • How to correctly mock React Navigation's getParam method using Jest
  • What is the better way to update other state variable which is dependent on another state variable while re-rendering?
  • Value of state variable is lost - React
  • How to compress the files using gzip in react app
  • Can we redirect to in reduxSaga
  • TypeError: Cannot read property 'map' of undefined (jest.js)
  • How to get state data from child to parent component?
  • Switching SubRoutes without unmounting MainRoute (React-Router-Dom)
  • Value must be set for boolean attributes with Typescript and Material UI
  • React + Firebase using hooks?
  • How to pass className style to sub component in `material-ui`?
  • How to create React hooks that forward dependencies
  • How to deploy React (NextJS) project with docker?
  • How to refetchQueries a query having an args option
  • How to fix "404" error when directly accessing a component in react
  • Cannot read property of undefined when using react hooks
  • React - Display message while binding data
  • React show/hide content
  • should I use shouldComponentupdate?
  • How to define a custom class to HighchartsReact component
  • How to handle dependencies array for custom hooks in react
  • Linting React+Typescript project with ESlint
  • How can remove console.log in the production build of a React application created using create-react-app?
  • How to get values from object and assign them to consts
  • Is it possible to show different icons for a react component in Webstorm?
  • React Rendering twice in Private Routes
  • Warning when using react hooks in HoC
  • Cannot find GooglePicker mimeTypes for doc and docx
  • Hooks equivalent for componentWilLReceiveProps to update state
  • Multi User login authentication | React Redux
  • React trigger useEffect when two things changes
  • Passing data from child to parent and setting state
  • Ant design - How do i auto close select ("tags" or "multiple" mode) dropdown after each selection?
  • React-datepicker with a Formik form
  • Apollo - React (Typescript) Invariant Error when building production build
  • 502 gateway error while deploying React v16.7 application in Google GCP app engine
  • How to install and run project in github
  • react native how to pass a state to all children
  • How can I use ComponentName.js instead of index.js when importing React component (from Atomic design structure director
  • MaterialTable - A state mutation was detected between dispatches
  • Module not found: Can't resolve './reducers/index'
  • Vertical Align using Material-UI paper
  • Extracting styles in React + material-ui
  • Switching between controlled mode (by using `selectedIndex`) and uncontrolled mode is not supported in `Tabs`
  • Infinite loop when I try to update the state
  • How to update react state that has object?
  • How to avoid useless rerender using useReducer([state,dispatch]) and useContext?
  • webpack-dev-server set cookie via proxy
  • React native Tab View congested when number of tab is increase
  • Get the response from the dispatch - React Redux
  • Issue on Product version of Styled-Components when render with Rendertron
  • shadow
    Privacy Policy - Terms - Contact Us © 35dp-dentalpractice.co.uk