Angular2 中的 BehaviorSubject 不是第二次设置值?
BehaviorSubject in Angular2 is not set value second time?
我的代码是这样的
login.component.ts
loginSucess () {
this.MenuService.setUserName(userauthresponce.username);
}
MenuService.ts
private usernameSource = new BehaviorSubject<any>(0);
setUserName (username) {
this.usernameSource.next(username);
}
getUserName () {
return this.usernameSource.asObservable();
}
other.component.ts
constructor(MenuService:MenuService) {
this.MenuService.getUserName().subscribe(responce => {
console.log('username', responce);
this.username = responce;
});
}
/* it's not working hear*/
switchrole() {
this.router.navigate(['/dashboard']);
this.MenuService.setUserName(this.username);
}
我在第一次登录时获取用户名,之后当用户单击切换角色按钮时它调用切换角色函数,在这个函数中我必须将页面导航到仪表板,在这种情况下我得到用户名 0;
即使我从 switchrole() 设置了用户名,但这不起作用
我没有收到错误请帮助我
尽量不要调用 this.usernameSource.asObservable()
而只调用 return this.usernameSource
因为你可以直接订阅 BehaviorSubject
但你不能在 Observable 上调用 next;
例如
private usernameSource = new BehaviorSubject<any>(0);
setUserName (username) {
this.usernameSource.next(username);
}
getUserName () {
return this.usernameSource;
}
我的代码是这样的
login.component.ts
loginSucess () {
this.MenuService.setUserName(userauthresponce.username);
}
MenuService.ts
private usernameSource = new BehaviorSubject<any>(0);
setUserName (username) {
this.usernameSource.next(username);
}
getUserName () {
return this.usernameSource.asObservable();
}
other.component.ts
constructor(MenuService:MenuService) {
this.MenuService.getUserName().subscribe(responce => {
console.log('username', responce);
this.username = responce;
});
}
/* it's not working hear*/
switchrole() {
this.router.navigate(['/dashboard']);
this.MenuService.setUserName(this.username);
}
我在第一次登录时获取用户名,之后当用户单击切换角色按钮时它调用切换角色函数,在这个函数中我必须将页面导航到仪表板,在这种情况下我得到用户名 0;
即使我从 switchrole() 设置了用户名,但这不起作用
我没有收到错误请帮助我
尽量不要调用 this.usernameSource.asObservable()
而只调用 return this.usernameSource
因为你可以直接订阅 BehaviorSubject
但你不能在 Observable 上调用 next;
例如
private usernameSource = new BehaviorSubject<any>(0);
setUserName (username) {
this.usernameSource.next(username);
}
getUserName () {
return this.usernameSource;
}