我的离子项目有问题 . 我所做的是将firebase数据库中的数据提取到fooList中，然后尝试使用该数据填充fooObjList . getAvatar 函数用于从firebase存储中获取imageUrl（avatarUrl），并返回图像的下载URL . 但是，当我尝试它; avatarUrl is returned undefined
此外，console.log（"avatarUrl :" avatarUrl）显示未定义 .
但是，console.log（"downloadUrl :" url）显示了我需要的下载URL .
avatarUrl :undefined
downloadUrl :https://firebasestorage.googleapis.com/v0/....000
如何将此URL添加到列表中？
我填充fooObjList的代码：
fooList: Observable<any[]>;
fooObjList: foo[] = [];
storage = firebase.storage();
storageRef = this.storage.ref();
constructor(public navCtrl: NavController, public dataProvider: DataProvider, afDatabase: AngularFireDatabase, afStorage: AngularFireStorage) {
this.fooList= afDatabase.list('/foos').valueChanges();
this.fooList.forEach(arr => {
arr.forEach(item => {
var avatarUrl = this.getAvatar(item.avatar);
console.log("avatarUrl :" + avatarUrl);
this.fooObjList.push(new foo(item.name, avatarUrl, item.tags));
})
})
getAvatar函数如下 .
getAvatar(img: string) {
this.count++;
if (this.count <= this.limit) {
var tangRef = this.storageRef.child('avatars/' + img);
tangRef.getDownloadURL().then(function (url) {
console.log("downloadUrl :" + url);
return url;
//var img = document.getElementById('myimg').setAttribute('src', url);
}).catch(function (error) {
// Handle any errors
});
}
}
我的foo类如下
export class foo{
name: string;
avatar: string;
tags: string[];
constructor(name: string, avatar: string, tags: string[]) {
this.name = name,
this.avatar = avatar,
this.tags = tags
}
}