我找到了这个答案,它显示了如何将表单控件添加到父表单:
Reuse components in angular2 model driven forms
但我希望能够像这样将新的formGroups添加到页面的不同区域。
<form [formGroup]="myForm">
<!--... other inputs -->
<md-tab-group formGroupName="nutrition">
<md-tab formGroupName="calories">
<template md-stretch-tabs="always" md-tab-label>Calories</template>
<template md-tab-content>
<calories></calories> <!-- I want to add controll groups like this-->
</template>
</md-tab>
<md-tab formGroupName="carbs">
<template md-stretch-tabs="always" md-tab-label>Carbs</template>
<template md-tab-content>
<carbs></carbs>
</template>
</md-tab>
</md-tab-group>
</form>
整个表单模型应如下所示:
{
name: '',
nutrition:{
calories: {
total: ''
// more
},
carbs: {
total: ''
// more
}
}
我已经能够像这样添加nutrition
formGroup:
<nutrition [parentForm]="myForm"></nutrition>
import { Component, OnInit, Input } from '@angular/core';
import { FormGroup, FormControl, FormBuilder, Validators } from '@angular/forms';
@Component({
selector: 'nutrition',
template: `
<div [formGroup]="parentForm"></div>
`
})
export class NutritionComponent implements OnInit {
@Input() parentForm: FormGroup;
nutritionGroup: FormGroup;
constructor(private _fb: FormBuilder) {
}
ngOnInit() {
this.nutritionGroup = new FormGroup({
blank: new FormControl('', Validators.required)
});
this.parentForm.addControl('nutrition', this.nutritionGroup);
}
}
但我无法弄清楚如何将nutrition
表单组传递给calories
formGroup,如下所示:
<calories [parentControl]="nutrition"></calories>
import { Component, OnInit, Input } from '@angular/core';
import { FormGroup, FormBuilder, FormControl, Validators } from '@angular/forms';
@Component({
selector: 'calories',
template: ``
})
export class CaloriesComponent implements OnInit {
@Input() parentControl: FormGroup;
caloriesForm: FormGroup;
constructor(private _fb: FormBuilder) { }
ngOnInit(){
this.caloriesForm = new FormGroup({
blank: new FormControl('', Validators.required)
});
this.parentControl.addControl('calories', this.caloriesForm);
}
}
可以这样做吗?
如果您(或任何人)仍然感兴趣,在将控件添加到parentControl
之后,您需要将其发送回父组件,以便可以更新它。
import { Output, EventEmitter } from '@angular/core';
@Output() onFormGroupChange: EventEmitter<FormGroup> = new EventEmitter<FormGroup>();
this.parentControl.addControl('calories', this.caloriesForm);
this.onFormGroupChange.emit(this.parentControl);
在父html元素上,您需要将其分配回qazxsw poi:qazxsw poi
和你的方法
parentControl
然后你将在你的父元素中使用FormGroup (onFormGroupChange)="setParentControl($event)"
中的控件并执行任何操作:public setParentControl(formGroup: FormGroup) {
this.myForm = formGroup;
}
没有包含所有代码,但只包含你需要的:)