我在尝试使用Angular 2和Forms时遇到麻烦。
我有一个邀请列表,其中有两个字段,分别是名称和电子邮件,以及一个用于添加更多行的按钮。
| __name _______ | __电子邮件_______ ||
| __name _______ | __电子邮件_______ ||
(+)添加行
而且我知道您可以使用FormArray来动态存储不同的行等等,但是我不确定如何使用它并使它工作。
到目前为止,我有
form:FormGroup;
ngOnInit() {
this.form = new FormGroup({
invitee: new FormArray([])
});
this.addInvitee();
}
addInvitee() {
let control = <FormArray>this.form.controls['invitee'];
control.push(new FormGroup({
name: new FormControl('', Validators.required),
email: new FormControl('', Validators.required)
}));
}
get inviteeArrayControl(): AbstractControl[] {
let control = this.form.controls['invitee'] as FormArray;
return control.controls;
}
我的组件HTML有这个
<div *ngFor="let discounts of discountsArrayControl;let i = index">
<div [formGroupName]="i">
<!-- Here goes the inputs but I don't know how to use them -->
</div>
</div>
<button (click)="addInvitee()">(+) Add row</button>
最佳答案
请参阅文档https://angular.io/guide/reactive-forms#use-formarray-to-present-an-array-of-formgroups
<form [formGroup]="form" (submit)="submit(form)"> <!-- your form-->
<!--if your form has fields that they are not array, put here
<input formControlName="field_in_not_array">
-->
<div formArrayName="invitee"> <!-- the Form Array of your form-->
<!-- a *ngFor over form.get('invitee').controls -->
<div *ngFor="let address of form.get('invitee').controls; let i=index"
[formGroupName]="i" >
<!--here the fields of the array-->
<input formControlName="name"/>
<input formControlName="email"/>
</div>
</div>
</form>
<button (click)="addInvitee()">(+) Add row</button>
<!--only to check-->
{{form?.value |json}}
关于javascript - FormArray的用法并动态添加控件行,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/51094563/