我正在使用Angular 4.0.2构建一个应用程序。如何向表单添加按钮以添加新行输入和删除特定行的删除按钮?我的意思是我想要一个像这样的表格。我希望我的表单看起来像这样:
.
这是我的代码:
附加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>
这是我的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(){
}
}
这是您的代码的缩短版本:
在初始化表单时,可以在formArray中添加一个空的表单组:
ngOnInit() {
this.invoiceForm = this._fb.group({
itemRows: this._fb.array([this.initItemRows()])
});
}
get formArr() {
return this.invoiceForm.get('itemRows') as FormArray;
}
然后功能:
initItemRows() {
return this._fb.group({
// list all your form controls here, which belongs to your form array
itemname: ['']
});
}
这是addNewRow
和deleteRow
函数:
addNewRow() {
this.formArr.push(this.initItemRows());
}
deleteRow(index: number) {
this.formArr.removeAt(index);
}
您的表单应如下所示:
<form [formGroup]="invoiceForm">
<div formArrayName="itemRows">
<div *ngFor="let itemrow of formArr.controls; let i=index" [formGroupName]="i">
<h4>Invoice Row #{{ i + 1 }}</h4>
<div>
<label>Item Name</label>
<input formControlName="itemname">
</div>
<button type="button" (click)="deleteRow(i)" *ngIf="formArr.controls.length > 1" >
Delete
</button>
</div>
</div>
<button type="button" (click)="addNewRow()">Add new Row</button>
</form>
这是一个