reactjs - React function passed to child through props is undefined -

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i trying pass selectnotebook notebooknav used in onclick() function. can see selectnotebook in prop in react dev tools, whenever click button, error uncaught typeerror: cannot read property 'selectnotebook' of undefined(…).

this parent component:

var app = react.createclass({    getinitialstate: function() {     return {       notebooks: this.props.notebooks,       nav: this.props.nav     };   },    selectnotebook: function(id) {     const nav = {...this.state.nav};     nav[notebook] = this.props.notebooks[id];     this.setstate({nav})   },    render: function() {     return (       <div style={{"height": "100%"}}>         <notebooknav            notebooks={this.props.notebooks}           selectnotebook={this.selectnotebook}         >         </notebooknav>         <technique></technique>       </div>     );   } });

this child component:

var notebooknav = react.createclass({    render: function() {     notebooks = this.props.notebooks;      return (       <div classname="col-md-4">         <div classname="panel panel-info">           <div classname="panel-heading">             <h4 classname="panel-title">your notebooks</h4>           </div>            <div classname="panel-body">             <ul classname="breadcrumb"                style={{"backgroundcolor": "#fff", "marginbottom": "0"}}             >               <li classname="active">                 notebooks               </li>             </ul>              <ul classname="nav nav-pills nav-stacked">               <div classname="btn-group-vertical" style={{"width": "100%"}}>                 {notebooks.map( function (notebook) {                   return(                     <li                        key={notebook.id}                        classname="btn btn-block btn-raised btn-lg"                       onclick={() => this.props.selectnotebook(notebook.id)}                     >                       {notebook.name}                     </li>                   );                 })}               </div>             </ul>           </div>         </div>       </div>     );   } }); 

      <div classname="btn-group-vertical" style={{"width": "100%"}}>         {notebooks.map( function (notebook) {           return(             <li                key={notebook.id}                classname="btn btn-block btn-raised btn-lg"               onclick={() => this.props.selectnotebook(notebook.id)}             >               {notebook.name}             </li>           );         })}       </div>

the problem transform function passed map create it's own scope, this undefined. fix this, array.prototype.map takes second argument scope can pass this outer scope:

{notebooks.map(function (notebook) { ... }, this)

if target environment supports can use arrow function, implicitly uses outer scope:

{notebooks.map((notebook) => { ... })}

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