使用firebase检索angular2中的数据

Question

我试图用angular2从firebase检索数据今天没有成功，我可以控制日志数据并查看对象，但是为了重用它们我在控制台中未定义，可能是同步和异步数据的问题，我是什么样的解决方案必须用angular2？

检索这些数据

谢谢

  read(){
    this.publicationUrl  = "https://FBURL/publication";
    this.PublicationRef = new Firebase(this.publicationUrl);
    this.PublicationRef.on("child_added", function(snapshot){
      this.publication = snapshot.val();
      console.log(this.publication)

    })
  }

Answer 1

问题是您将数据设置为错误的this对象。使用arrow function保留词法范围：

read() {
    this.publicationUrl  = "https://FBURL/publication";
    this.PublicationRef = new Firebase(this.publicationUrl);
    this.PublicationRef.on("child_added", snapshot => {
        this.publication = snapshot.val();
        console.log(this.publication);
    });
}