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I'm fetching data from an API server to generate the NavBar Menu dynamically.

Problem is that the menu re-renders each time I navigate through the pages. Can't figure out why it's happening. I tried different examples for react-router v4 like using but the menu is always re-rendering.

What pattern do you use to prevent NavBar Menu from re-rendering when generating the Menu dynamically?

Here are the basic setup files:

Main.js file:

import React from 'react'
import { Route } from 'react-router-dom'
import Home2 from './Home'
import Head from './Head'
import Rules from './Rules'

const Main = () => (
  <main>
    <Route  path='/' component={Head}/>
    <Route exact path='/' component={Home}/>
    <Route exact path='/rules' component={Rules}/>
  </main>
)

export default Main

Head.js file:

import React, { Component } from 'react'
import Menu from 'semantic-ui-react'

class Head extends Component {
  constructor(props) {
   super(props);
  }

  getInitialData() {
    //fetch data from server
  }

  componentWillMount() {
    this.getInitialData();
  }

  render() {
    return (
      <header>
        <nav>
          <Menu>
            {/* fetched data */}
        </nav>
      </header>
    )
  }
}

export default Head

Index.js file:

import React from 'react'
import { render } from 'react-dom'
import Main from './components/Main'
import { BrowserRouter } from 'react-router-dom'

render((
  <BrowserRouter>
    <Main />
  </BrowserRouter>
), document.getElementById('root'));

Using React Router v3 this code works fine:

var Routes = (
  <Router>
    <Route path="/" component={Head}>
      <IndexRoute component={Home} />
    </Route>
  </Router>
);

But in v4 I can't nest Routes.

Answers

Because you're including the header as a route, it's re-rendering every time the route changes. Just pull the header out of the route and it will stay consistent while the route-based components change:

import React from 'react'
import { Route, Switch } from 'react-router-dom'
import Home2 from './Home'
import Head from './Head'

const Main = () => (
  <main>
    <Head />
    <Switch>
      <Route exact path='/' component={Home}/>
      // Add any other routes you want here
    </Switch>
  </main>
)

export default Main;
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