问题描述
所以我正在Angular中开发一个新组件,在ngOninit中,我在下面有以下异步函数...
So I was working on a new component in Angular and in the ngOninit I have the following asynchronous functions below...
需要先完成This.getUserProfile,然后才能调用this.getPrivateGroup(),然后要完成this.getPrivateGroup(),然后才能调用this.loadGroupPosts().我知道我可以在异步请求的回调中编写这些函数,但是我想知道是否存在一种方法可以将其保留在ngOnInit中以使其更清洁?
This.getUserProfile needs to be finished before I can call this.getPrivateGroup() and this.getPrivateGroup() needs to be finished before I can call this.loadGroupPosts(). I know I could write these functions inside the callback of the asynchronous requests, but I was wondering if there is a way to keep it in ngOnInit to keep it cleaner?
有人有主意吗?
ngOnInit() {
this.getUserProfile();
// my-workplace depends on a private group and we need to fetch that group and edit
// the group data before we proceed and get the group post
if (this.isItMyWorkplace) {
this.getPrivateGroup();
}
this.loadGroupPosts();
}
getUserProfile() {
this._userService.getUser()
.subscribe((res) => {
this.user = res.user;
console.log('log user', this.user);
this.profileImage = res.user['profile_pic'];
this.profileImage = this.BASE_URL + `/uploads/${this.profileImage}`;
}, (err) => {
this.alert.class = 'alert alert-danger';
if (err.status === 401) {
this.alert.message = err.error.message;
setTimeout(() => {
localStorage.clear();
this._router.navigate(['']);
}, 3000);
} else if (err.status) {
this.alert.class = err.error.message;
} else {
this.alert.message = 'Error! either server is down or no internet connection';
}
});
}
getPrivateGroup() {
console.log('user check', this.user);
this.groupService.getPrivateGroup(`${this.user.first_name}${this.user.last_name}`)
.subscribe((group) => {
console.log('received response', group)
})
}
// !--LOAD ALL THE GROUP POSTS ON INIT--! //
loadGroupPosts() {
this.isLoading$.next(true);
this.postService.getGroupPosts(this.group_id)
.subscribe((res) => {
// console.log('Group posts:', res);
this.posts = res['posts'];
console.log('Group posts:', this.posts);
this.isLoading$.next(false);
this.show_new_posts_badge = 0;
}, (err) => {
swal("Error!", "Error while retrieving the posts " + err, "danger");
});
}
// !--LOAD ALL THE GROUP POSTS ON INIT--! //
推荐答案
您可以在 async/await
中使用基本的Promise.
You can use basic promises with async/await
.
async ngOnInit() {
await this.getUserProfile(); // <-- 1. change
// my-workplace depends on a private group and we need to fetch that group and edit
// the group data before we proceed and get the group post
if (this.isItMyWorkplace) {
this.getPrivateGroup();
}
this.loadGroupPosts();
}
async getUserProfile() {
this._userService.getUser()
.subscribe((res) => {
this.user = res.user;
console.log('log user', this.user);
this.profileImage = res.user['profile_pic'];
this.profileImage = this.BASE_URL + `/uploads/${this.profileImage}`;
return true; // <-- this
}, (err) => {
this.alert.class = 'alert alert-danger';
if (err.status === 401) {
this.alert.message = err.error.message;
setTimeout(() => {
localStorage.clear();
this._router.navigate(['']);
}, 3000);
} else if (err.status) {
this.alert.class = err.error.message;
} else {
this.alert.message = 'Error! either server is down or no internet connection';
}
throw err;
});
}
这篇关于等待异步功能在Angular中完成的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!