我对Angular 2 Form(formbuilder)的默认值有问题：
我的默认值是observables(我正在从服务器检索),所以我不能像这样实现它们：
我的默认值是observables(我正在从服务器检索),所以我不能像这样实现它们：
export class UserComponent implements OnInit{
userForm: ControlGroup;
userData: any; // Initialise the observable var
ngOnInit():any {
this.userData = this._dataService.getAllData() // My Observable
.subscribe(
data => {
this.userData = data;
}
);
this.userForm = this._formBuilder.group({
// below the default value
'username': [this.userData.username,Validators.compose([
this.usernameValid
])]
}
我会尝试这个,因为数据是异步加载的.因此,您需要在响应/接收时更新表单元素的值.
ngOnInit():any {
this.userData = this._dataService.getAllData()
.subscribe(
data => {
this.userData = data;
this.userForm.controls.username.updateValue(
this.userData.username);
}
);
this.userForm = this._formBuilder.group({
'username': [this.userData.username,Validators.compose([
this.usernameValid
])];
}
