How does React-router handle component reloading when there is a change in the state of the parent component

Within my React application, I've integrated a ResponsiveDrawer component sourced from material-ui's demo. This component essentially displays a drawer containing a list of menu items, a title bar, and a content frame.

The state of the component includes a variable called mobileOpen.

state = {
    mobileOpen: false
};

This variable updates when the user clicks the hamburger icon.

handleDrawerToggle = () => {
    this.setState({ mobileOpen: !this.state.mobileOpen });
};

(...)

<Drawer type="temporary" anchor="left" open={this.state.mobileOpen} classes={{paper: classes.drawerPaper}} onRequestClose={this.handleDrawerToggle} ModalProps={{keepMounted: true // Better open performance on mobile.}}>
    <div>
        <div className={classes.drawerHeader} />
        <Divider />
        <MenuList onRequestClose={this.handleDrawerToggle} />
    </div>

I've also established various routes within the content section of the ResponsiveDrawer:

<main className={classes.content}>
    <div className={classes.contentWrapper}>
        <Switch>
            <Route
                exact
                path="/currencies"
                component={CurrenciesComponent}
            />
            <Route
                exact
                path="/"
                component={ProfileComponent}
            />
            <Route component={NotFoundComponent} />
        </Switch>
    </div>
</main>

The CurrenciesComponent in one of the routes is defined as follows:

const CurrenciesComponent = () => (
        <Currencies isSignedIn={this.isSignedIn} />
    );

Upon clicking the hamburger icon, the state of ResponsiveDrawer changes, causing the CurrenciesComponent to reload unnecessarily due to an API call it contains. To prevent this re-rendering issue, I adjusted the route as shown below:

<Route exact path="/currencies" component={Currencies} />

How can I avoid the re-render while still passing props to the CurrenciesComponent when defining the route?

Answer №1

After some troubleshooting, I managed to resolve the problem by opting for render in place of the component prop when defining my routes:

<Route exact path="/currencies" render={CurrenciesComponent}/>

Answer №2

If you want your component to update only under certain conditions, React provides a method called shouldComponentUpdate. This method is part of React's lifecycle and determines whether the component should be updated or not based on the return value (true for update, false for no update).

One efficient way to prevent unnecessary re-renders is by using PureComponent instead of Component. PureComponent automatically implements shouldComponentUpdate and optimizes rendering by checking if any changes in props or state have occurred before updating.

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