我尝试制作一个动态表单(因此您可以无限地将项目添加到列表中),但不知何故,我的列表的内容没有被发送,因为它找不到带有路径的控件:
找不到带有路径的控件:’list_items -> list_item’
我的组件:
@Component({
selector: 'app-list',
templateUrl: './list.component.html',
styleUrls: ['./list.component.css']
})
export class ListComponent implements OnInit {
listForm: FormGroup;
constructor(private nodeService: NodeService, private messageService: MessageService, private fb: FormBuilder,
private listService: ListService) {
this.listForm = this.fb.group({
title: ['', [Validators.required, Validators.minLength(5)]],
list_items: this.fb.array([
this.initListItem(),
])
});
}
initListItem() {
return this.fb.group({
list_item: ['']
});
}
initListItemType() {
return this.fb.group({
list_item_type: ['']
});
}
addListItem() {
const control = <FormArray>this.listForm.controls['list_items'];
control.push(this.initListItem());
}
模板(list.component.html):
<h2>Add List </h2>
<form [formGroup]="listForm" novalidate (ngSubmit)="addList(listForm)">
<div class="form-group">
<input type="text" class="form-control" formControlName="title" placeholder="Title">
</div>
<div formArrayName="list_items">
<div *ngFor="let list_item of listForm.controls.list_items.controls; let i=index" class="panel panel-default">
{{i + 1}}.) <input type="text" formControlName="list_item" placeholder="List Item" class="form-control">
</div>
<a (click)="addListItem()">Add List Item +</a>
</div>
<button type="submit">Submit</button>
</form>
标题工作得很好,但我找不到导致错误的“formControlName”错误。
提前感谢您在此问题上的任何帮助。
更新我更改 的 list.component.html
<h2>Add List </h2>
<form [formGroup]="listForm" novalidate (ngSubmit)="addList(listForm)">
<div class="form-group">
<input type="text" class="form-control" formControlName="title" placeholder="Title">
</div>
<div formArrayName="list_items">
<div *ngFor="let list_item of listForm.controls.list_items.controls; let i=index" class="panel panel-default">
{{i + 1}}.) <input type="text" formControlName="{{i}}" placeholder="List Item" class="form-control">
</div>
<a (click)="addListItem()">Add List Item +</a>
</div>
<button type="submit">Submit</button>
</form>
在我的组件中,我更改了构造函数和 addListItem 方法:
listForm: FormGroup;
constructor(private nodeService: NodeService, private messageService: MessageService, private fb: FormBuilder,
private listService: ListService) {
this.listForm = this.fb.group({
title: ['', [Validators.required, Validators.minLength(5)]],
list_items: this.fb.array([
[''],
])
});
}
addListItem() {
const control = <FormArray>this.listForm.controls['list_items'];
control.push(this.fb.control(['']));
console.log(control)
}
原文由 dowu 发布,翻译遵循 CC BY-SA 4.0 许可协议
在映射到组件文件的 HTML 表单中应该有一个
formControlName
。