我正在使用 Angular 4.0.2 构建一个应用程序。我怎样才能在表单中添加一个按钮来添加新的输入行,并为删除某一行添加一个删除按钮?我的意思是,我想要一个这样的表单。我希望我的表单看起来像这样:
.
以下是我的代码:
add-invoice.component.html
<h3 class="page-header">Add Invoice</h3>
<form [formGroup]="invoiceForm">
<div formArrayName="itemRows">
<div *ngFor="let itemrow of itemRows.controls; let i=index" [formGroupName]="i">
<h4>Invoice Row #{{ i + 1 }}</h4>
<div class="form-group">
<label>Item Name</label>
<input formControlName="itemname" class="form-control">
</div>
<div class="form-group">
<label>Quantity</label>
<input formControlName="itemqty" class="form-control">
</div>
<div class="form-group">
<label>Unit Cost</label>
<input formControlName="itemrate" class="form-control">
</div>
<div class="form-group">
<label>Tax</label>
<input formControlName="itemtax" class="form-control">
</div>
<div class="form-group">
<label>Amount</label>
<input formControlName="amount" class="form-control">
</div>
<button *ngIf="i > 1" (click)="deleteRow(i)" class="btn btn-danger">Delete Button</button>
</div>
</div>
<button type="button" (click)="addNewRow()" class="btn btn-primary">Add new Row</button>
</form>
<p>{{invoiceForm.value | json}}</p>
以下是 add-invoice.component.ts 的代码
import { Component, OnInit } from '@angular/core';
import { FormBuilder, FormControl, FormArray, FormGroup } from '@angular/forms';
@Component({
selector: 'app-add-invoice',
templateUrl: './add-invoice.component.html',
styleUrls: ['./add-invoice.component.css']
})
export class AddInvoiceComponent implements OnInit {
invoiceForm: FormGroup;
constructor(
private _fb: FormBuilder
) {
this.createForm();
}
createForm(){
this.invoiceForm = this._fb.group({
itemRows: this._fb.array([])
});
this.invoiceForm.setControl('itemRows', this._fb.array([]));
}
get itemRows(): FormArray {
return this.invoiceForm.get('itemRows') as FormArray;
}
addNewRow(){
this.itemRows.push(this._fb.group(itemrow));
}
ngOnInit(){
}
}