reactjs - Target element from another component onClick - React JS -


i have toggle icon in header.js component on click want change class of element in sidebar component in order change width , minimize half width. best way can react? have togglesidebar function on header component checks state , changes onclick, im not sure go here?

header.js : 

import react "react";  export class header extends react.component {     constructor(props) {         super(props);          this.togglesidebar = this.togglesidebar.bind(this);         this.state = {             istoggled: false         }     }      togglesidebar() {         if(this.state.istoggled) {             this.setstate({                 istoggled: false             })          } else {             this.setstate({                 istoggled: true             })         }     }      render() {         return (             <nav classname="navbar navbar-toggleable-md navbar-light bg-faded">                 <button classname="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarsupportedcontent" aria-controls="navbarsupportedcontent" aria-expanded="false" aria-label="toggle navigation">                     <span classname="navbar-toggler-icon"></span>                 </button>                 <a classname="navbar-brand" href="#" onclick={this.togglesidebar}><span classname="fa fa-bars" aria-hidden="true"></span></a>                  <div classname="collapse navbar-collapse" id="navbarsupportedcontent">                     <ul classname="navbar-nav ml-auto">                         <li classname="nav-item active">                             <a classname="nav-link" href="#"><img alt="user dp" classname="header__user__img img-fluid rounded-circle" src="../resources/img/user.jpg" /> mark hughes</a>                         </li>                     </ul>                 </div>             </nav>         );     } }

sidebar.js :

import react "react";  import sidebarcategories "./sidebarcategories";  export class sidebar extends react.component {     render() {         return (             <div classname="sidebar col-sm-2">                 <div classname="row">                     <div classname="sidebar__header col">                         <img alt="logo" classname="img-fluid sidebar__header__logo" src="../resources/img/logo-white.png" />                         {'\u00a0'} <h4 classname="sidebar__header__title i-block">title</h4>                     </div>                 </div>                 <div classname="row">                     <div classname="sidebar__user container-fluid">                         <div classname="row">                             <div classname="col-sm-4 text-center">                                 <img alt="user dp" classname="sidebar__user__img img-fluid rounded-circle" src="../resources/img/user.jpg" />                             </div>                             <div classname="col-sm-8">                                 <p><strong>welcome</strong><br />                                 mark hughes</p>                             </div>                         </div>                     </div>                 </div>                 <div classname="row">                     <sidebarcategories />                 </div>             </div>         );     } }


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