[Solved]-Updating state on props change in React Form-Reactjs

i think use ref is safe for me, dont need care about some method above.

class company extends xcomponent {
    constructor(props) {
        super(props);
        this.data = {};
    }
    fetchdata(data) {
        this.resetstate(data);
    }
    render() {
        return (
            <input ref={c => this.data['name'] = c} type="text" classname="form-control" />
        );
    }
}
class xcomponent extends component {
    resetstate(obj) {
        for (var property in obj) {
            if (obj.hasownproperty(property) && typeof this.data[property] !== 'undefined') {
                if ( obj[property] !== this.data[property].state.value )
                    this.data[property].setstate({value: obj[property]});
                else continue;
            }
            continue;
        }
    }
}

i came up with the following solution using functional components and the useeffect hook: it works by having the useeffect hook watch the controlling property from props

const { useeffect, usestate } = react

const child = (props) => {
    const [bgcolor, setbgcolor] = usestate(props.bgcolor);
    const { children } = props;

    useeffect(() => {
        setbgcolor(props.bgcolor);
    }, [props.bgcolor]);

    return (
        <div style={{ height: "100px", width: "100px", backgroundcolor: bgcolor }}>{children}</div>
    )
}

const parent = (props) => {
    const [childcontrollingprop, setchildcontrollingprop] = usestate(props.childcontrollingprop);
    const { title } = props;
    const inputref = react.createref();

    return (
        <>
            <input ref={inputref} type="text" onchange={() => setchildcontrollingprop(inputref.current.value)}/>
            <child bgcolor={childcontrollingprop}>{title}</child>
        </>
    )
}

$(document).ready(() => {
    reactdom.render(
        <parent title="title" childcontrollingprop="blue"/>,
        document.queryselector("#root")
    );
})

<script src="https://unpkg.com/react@16/umd/react.production.min.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>

<div id="root"></div>

it's quite clearly from their docs:

if you used componentwillreceiveprops for re-computing some data only when a prop changes, use a memoization helper instead.

use: https://reactjs.org/blog/2018/06/07/you-probably-dont-need-derived-state.html#what-about-memoization

use memoize

the op's derivation of state is a direct manipulation of props, with no true derivation needed. in other words, if you have a prop which can be utilized or transformed directly there is no need to store the prop on state.

given that the state value of start_time is simply the prop start_time.format("hh:mm"), the information contained in the prop is already in itself sufficient for updating the component.

however if you did want to only call format on a prop change, the correct way to do this per latest documentation would be via memoize: https://reactjs.org/blog/2018/06/07/you-probably-dont-need-derived-state.html#what-about-memoization

the data source of the form must be based on user input, in the case that the user has entered, any situation resulting in the update of the subcomponent, will trigger componentwillreceiveprops or getderivedstatefromprops operation, at this time, the value after comparison is certainly not equal, after the execution of setstate, the value of the user input will be changed, is not this a mistake?

from react documentation : https://reactjs.org/blog/2018/06/07/you-probably-dont-need-derived-state.html

erasing state when props change is an anti pattern

since react 16, componentwillreceiveprops is deprecated. from react documentation, the recommended approach in this case is use

1. fully controlled component: the parentcomponent of the modalbody will own the start_time state. this is not my prefer approach in this case since i think the modal should own this state.
2. fully uncontrolled component with a key: this is my prefer approach. an example from react documentation : https://codesandbox.io/s/6v1znlxyxn . you would fully own the start_time state from your modalbody and use getinitialstate just like you have already done. to reset the start_time state, you simply change the key from the parentcomponent

// store the starttime prop in local state
const [starttime, setstarttime] = usestate(props.starttime)
// 
useeffect(() => {
  if (props.starttime !== starttime) {
    setstarttime(props.starttime);
  }
}, [props.starttime]);

can this method be migrated to class components？

you probably don't need derived state

1. set a key from the parent

when a key changes, react will create a new component instance rather than update the current one. keys are usually used for dynamic lists but are also useful here.

2. use getderivedstatefromprops / componentwillreceiveprops

if key doesn’t work for some reason (perhaps the component is very expensive to initialize)

by using getderivedstatefromprops you can reset any part of state but it seems a little buggy at this time (v16.7)!, see the link above for the usage

there is also componentdidupdate available.

function signatur:

componentdidupdate(prevprops, prevstate, snapshot)

use this as an opportunity to operate on the dom when the component has been updated. doesn't get called on initial render.

see you probably don't need derived state article, which describes anti-pattern for both componentdidupdate and getderivedstatefromprops. i found it very useful.

the new hooks way of doing this is to use useeffect instead of componentwillreceiveprops the old way:

componentwillreceiveprops(nextprops) {
  // you don't have to do this check first, but it can help prevent an unneeded render
  if (nextprops.starttime !== this.state.starttime) {
    this.setstate({ starttime: nextprops.starttime });
  }
}

becomes the following in a functional hooks driven component:

// store the starttime prop in local state
const [starttime, setstarttime] = usestate(props.starttime)
// 
useeffect(() => {
  if (props.starttime !== starttime) {
    setstarttime(props.starttime);
  }
}, [props.starttime]);

we set the state using setstate, using useeffect we check for changes to the specified prop, and take the action to update the state on change of the prop.

componentwillreceiveprops is being deprecated because using it "often leads to bugs and inconsistencies".

if something changes from the outside, consider resetting the child component entirely with key.

providing a key prop to the child component makes sure that whenever the value of key changes from the outside, this component is re-rendered. e.g.,

<emailinput
  defaultemail={this.props.user.email}
  key={this.props.user.id}
/>

on its performance:

while this may sound slow, the performance difference is usually insignificant. using a key can even be faster if the components have heavy logic that runs on updates since diffing gets bypassed for that subtree.

apparently things are changing.... getderivedstatefromprops() is now the preferred function.

class component extends react.component {
  static getderivedstatefromprops(props, current_state) {
    if (current_state.value !== props.value) {
      return {
        value: props.value,
        computed_prop: heavy_computation(props.value)
      }
    }
    return null
  }
}

(above code by danburzo @ github )