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Cleaner way to change focus on child components in React


Cleaner way to change focus on child components in React

By : mara
Date : November 22 2020, 10:31 AM
hop of those help? There are a few ways to do this, but none are really 'better' than this.
The alternatives would use a mixin, but that brings in the mental cost of black box abstraction for little gain. I'd just keep it as is.
code :


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React not re-rendering after a change in state, how do I setState of child components?

React not re-rendering after a change in state, how do I setState of child components?


By : Brett
Date : March 29 2020, 07:55 AM
Hope that helps The state.legislator in your child component is not being updated because the code:
code :
this.state = {
  legislator: props.legislator,
  fields: ["first_name", "last_name", "state", "party"]
}
 class Legislator extends React.Component {
  constructor(props) {
    super();
    this.state = {
      fields: ["first_name", "last_name", "state", "party"]
    }
  }

  render() {
    const legislatorRow = this.state.fields.map((field) =>
        <LegislatorField value={ this.props.legislator[field] } />
    )
    return (
      <tr key={this.state.legislator.id}>
        { legislatorRow }      
      </tr>
    );
  }
}
React Redux-Form using child components with child components that have multiple submits

React Redux-Form using child components with child components that have multiple submits


By : uzair
Date : March 29 2020, 07:55 AM
With these it helps Is it absolutely necessary to submit stuff like sort directions, or is that in some way relevant to your backend? Seems to me like this should be a responsibility for the client.
Leaving it up to the client also has an added benefit of making all this a lot simpler, since you could just dispatch a regular action for when you want to change sort direction. That action could then call your backend with the requested sort direction and that can update the new state accordingly.
code :
export const TableHeaders = (props) => {
  const { onSortByChange, onSortDirectionChange } = props;

  return (
    <div>
      <span onClick={() => onSortByChange('ClientNumber')}>Client #</span>
      <span onClick={() => onSortByChange('SomethingElse')}>Something else</span>

      <GlyphiconDirectionChange onSortDirectionChange={onSortDirectionChange} />
    </div>
  );
}

const GlyphiconDirectionChange = (props) => {
  const { onSortDirectionChange } = props;

  return (
    <div>
      <span onClick={() => onSortDirectionChange('asc')}>Asc</span>
      <span onClick={() => onSortDirectionChange('desc')}>Desc</span>
    </div>
  );
}
class ClientsContainer extends Component {
  handleSortDirection = (direction) => {
    // Call Redux action to update your sort direction state
  }

  handleSortBy = (by) => {
    // Call Redux action to update your sort by state
  }

  render() {
    return (
      <div>
        <TableHeaders
          onSortByChange={this.handleSortBy}
          onSortDirectionChange={this.handleSortDirection}
          /* other props */
        />
      </div>
    );
  }
}
React Child components in an Array not updating on prop change

React Child components in an Array not updating on prop change


By : user1852850
Date : March 29 2020, 07:55 AM
this one helps. As mentioned in comments
It won’t re render again because you are generating chil components in componentDidMount and this method gets called only once per the component after first render. So when your callback fires the child_array will be empty
code :
render(){
     const store = [];
     for (var i = 0; i < 5; i++){
        store.push(<Child test = {this.state.msg} key = {i} onClick = {this.handleClick}/>);
       }
       return(
            <div>
              {store}
            </div>
       )
How to update (re-render) the child components in React when the parent's state change?

How to update (re-render) the child components in React when the parent's state change?


By : user3428560
Date : March 29 2020, 07:55 AM
I wish this help you It is because your Child component is using its own state as well. Always ask yourself if state is necessary, its a common mistake for React beginner.
Hope you can understand it more by looking at this example. Instead of calling setInterval in your constructor function, I will recommend you to call it in componentDidMount and to clearInterval in your componentWillUnmount.
code :
// Since you are not using state, you can use functional component for your Child component
const Child = ({ number }) => <h1>{number}</h1>;

class Parent extends React.Component {
  constructor(props) {
    super(props);
    this.timer = null;
    this.state = { number: 0 };
  }

  componentDidMount() {
    // setInterval after component did mount
    this.timer = setInterval(this.incrementNumber, 1000);
  }

  componentWillUnmount() {
    // clearInterval when component is going to unmount
    if (this.timer) {
      clearInterval(this.timer);
    }
  }

  incrementNumber = () => {
    // setState function callback to ensure state received will be latest state
    this.setState(prevState => ({ number: prevState.number + 1 }));
  }

  render() {
    const { number } = this.state;
    return (
      <div>
        <Child number={number} />
      </div>
    );
  }
}
Remounting all react child components after root state change

Remounting all react child components after root state change


By : Elizabeth Korthof
Date : March 29 2020, 07:55 AM
help you fix your problem I'm building a pretty large application and would like to get some insight on the best way to re-render the application based on a root component state change. , What you have mentioned about
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