Confirm Window in React

I have this following code :

renderPosts() {
return _.map(this.state.catalogue, (catalogue, key) => {
  return (
    <div className="item col-md-3" key={key} id={key}>
        <img src={this.state.catalogue[key].avatarURL} height={150} with={150}/>
        <h3>{catalogue.marque}</h3>
        <h4>{catalogue.numero}</h4>
        <h4>{catalogue.reference}</h4>
        <p>{catalogue.cote}</p>
        <div className="text-center">
        <button className="btn btn-danger" onClick={() => {if(window.confirm('Delete the item?')){this.removeToCollection.bind(this, key)};}}>Supprimer</button>
        </div>

    </div>
  )
 })
}

And I have this function too:

removeToCollection(key, e) {

  const item = key;
  firebase.database().ref(`catalogue/${item}`).remove();
 }

When I use the function without a confirm window in my "onclick" button, the code work great. But when I want use a confirm window, the confirm window show when I click on my button, but my item is not delete.

Any idea ?

Thank for your help !

Basically you're binding the function instead of calling it... you should bind beforehand, preferably in the constructor... then call it. Try this:

renderPosts() {
  this.removeToCollection = this.removeToCollection.bind(this);
  return _.map(this.state.catalogue, (catalogue, key) => {
    return (
      <div className="item col-md-3" key={key} id={key}>
          <img src={this.state.catalogue[key].avatarURL} height={150} with={150}/>
          <h3>{catalogue.marque}</h3>
          <h4>{catalogue.numero}</h4>
          <h4>{catalogue.reference}</h4>
          <p>{catalogue.cote}</p>
          <div className="text-center">
          <button className="btn btn-danger" onClick={() => {if(window.confirm('Delete the item?')){this.removeToCollection(key, e)};}}>Supprimer</button>
          </div>

      </div>
    )
  })
}