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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 :


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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 {
  constructor(props){
    super(props);
    this.state = {
      showPagination: true
    }
  }

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

  render() {
    return (
      <div>
        {
          this.state.showPagination
          ?
          <Pagination onChangePagination={this.onChangePagination}/>
          :
          <button onClick={this.onChangePagination}>
            show pagination
          </button>
        }

      </div>
    )
  }
}

class Pagination extends Component {
  handleClick() {
    this.props.onChangePagination()
  }

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

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}>
                    <Table.Cell>{item.name}</Table.Cell>
                    <Table.Cell>{this.state.reps[index]}</Table.Cell>
                    <Table.Cell>
                        <Button.Group compact size="mini">
                            <Button onClick={() => this.decreaseReps(index)} icon="minus" />;
                            <Button onClick={() => this.increaseReps(index)} icon="plus" />;
                        </Button.Group>
                    </Table.Cell>
                </Table.Row>
             );
        });
    };
}

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 }}>
          {item.fullName}
        </Text>
      </TouchableOpacity>
     </View>
   );
})

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]}>
        {i.label}
      </button>
    ));
  };

  //Here you pass the ref as an argument and just focus it
  focusElement = item => {
    item.current.focus();
  };

  render() {
    return (
      <div>
        {this.renderList()}
        <button
          onClick={() => {
            //Here you are able to focus any item that you want based on the ref in the state
            this.focusElement(this.state.myButtonsRef[0]);
          }}
        >
          Focus the item 0
        </button>
      </div>
    );

  }
}
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