reactjs - How to get on the key of the parent from his child in Javascript? -


i want take name of parent highlight yellow i want take name of parent highlight yellow

let postref = fire.database().ref('users/').orderbykey().limittolast(100);     postref.on('child_added', snapshot => {         snapshot.foreach(childsnapshot => {             let author = snapshot.key;             childsnapshot.foreach(result => {                 let finaly = {text: result.val(), key: result.key , author: tostring(author)}                 this.setstate({posts: [finaly].concat(this.state.posts)})             })         })     })      postref.on('child_changed', snapshot => {         snapshot.foreach(childsnapshot => {             let author = snapshot.key;             childsnapshot.foreach(result => {                 let finaly = {text: result.val(), key: result.key , author: tostring(author)  }                 this.setstate({posts: [finaly].concat(this.state.posts)})             })         })     })

this show item database , posts.author show object undefined

<item.group>     {         this.state.posts.map(posts =>             <item key={posts.key} author={posts.author}color="red">                 <item.image size='tiny'                             src='https://turnkeyit.co.uk/assets/img/prose-icon-(blog).png'/>                  <item.content>                     <item.header>titolo</item.header>                     <item.meta>pubblicato alle /gg/mm/yy</item.meta>                     <item.description>                         {posts.text} {posts.key}                     </item.description>                     <item.extra>                         <button color="blue" floated='right'                                onclick={this.getpost.bind(posts.key)}> rivelati <icon                             name='heart'/> </button>                     </item.extra>                 </item.content>             </item>         )     } </item.group>

and funcition call show uid

getpost(data){     alert(data) }

with code, take value of posts of users, want make button take id user makes post. how can parents key?


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