angular2中的嵌套形式 [英] Nested Forms in angular2
问题描述
如何创建带有嵌套字段的表单，我对angular2 RC中的formArray有所了解，但有点困惑如何正确使用它?
假设我有这样的表格
How to create form with nesting fields, i know about formArray in angular2 RC but am bit confused how to use it correctly ?
let suppose i have an form like this
// Main Form with formArray named as `global_modifier`
this.myForm = this._fb.group({
.......
name: ['', []],
global_modifier: this._fb.array([
this.initGlobalModifiers()
])
....
});
removeModifier(i: number) {
const control = <FormArray>this.myForm.controls['global_modifier'];
control.removeAt(i);
}
addModifier() {
const control = <FormArray>this.myForm.controls['global_modifier'];
control.push(this.initGlobalModifiers());
}
/*global_modifier function having nested fields named `items` .....*/
initGlobalModifiers() {
return this._fb.group({
.....
modifier_title: ['', []],
items: this._fb.array([
this.initItems()
])
.........
});
}
removeItem(i: number) {
const control = <FormArray>this.myForm.controls['items'];
control.removeAt(i);
}
addItem() {
const control = <FormArray>this.myForm.controls['items'];
control.push(this.initItems());
}
// items intilization
initItems() {
return this._fb.group({
item_title: ['', []],
item_price: ['', []]
});
}
现在我很困惑如何在html中使用这种形式?
now i am confused how to use this form in the html ??
我正在尝试此操作，但是没有按预期工作..
i am trying this but did't work as expected..
<form [formGroup]="myForm" novalidate>
<input type="text" placeholder="name" formControlName="name" maxlength="50">
<div formArrayName="global_modifier" *ngFor="let cont of myForm.controls.global_modifier.controls; let i=index, let fst=first">
<div [formGroupName]="i">
<input type="text" placeholder="modifier_title" formControlName="modifier_title" maxlength="50">
<button *ngIf="fst" [ngClass]="{'inputAddButton ':fst}" (click)="addModifier(i)" type="button">
<i class="fa fa-plus fa-white" aria-hidden="true"></i>
</button>
<button *ngIf="!fst" [ngClass]="{'inputDeleteButton ':!fst}" (click)="removeModifier(i)">
<i class="fa fa-trash-o fa-white" aria-hidden="true"></i>
</button>
<!--block For form mlutiple entrys-------------------->
<div formArrayName="items">
<div *ngFor="let items of cont.items; let item_index=index, let fst=first">
<div [formGroupName]="i">
<div style="margin-bottom:10px">
............... NOTHING dISPLAY HERE ???
</div>
</div>
</div>
</div>
<!--block For form mlutiple entrys---=------------>
<br>
</div>
</div>
</form>
我的代码有什么错误?或者 有谁在angular2中有嵌套形式的工作示例?
whats the error in my code ? or anyone having working example of nested forms in angular2 ?
推荐答案
在rc4之前检查适用于我的示例(未检入较新版本):
Check this example that worked for me until rc4 (didn't check in newer versions):
表单标记
ngOnInit() {
this.myForm = this.formBuilder.group({
'loginCredentials': this.formBuilder.group({
'login': ['', Validators.required],
'email': ['', [Validators.required, customValidator]],
'password': ['', Validators.required]
}),
'hobbies': this.formBuilder.array([
this.formBuilder.group({
'hobby': ['', Validators.required]
})
])
});
}
removeHobby(index: number){
(<FormArray>this.myForm.find('hobbies')).removeAt(index);
}
onAddHobby() {
(<FormArray>this.myForm.find('hobbies')).push(new FormGroup({
'hobby': new FormControl('', Validators.required)
}))
}
html标记
<h3>Register page</h3>
<form [formGroup]="myForm" (ngSubmit)="onSubmit()">
<div formGroupName="loginCredentials">
<div class="form-group">
<div>
<label for="login">Login</label>
<input id="login" type="text" class="form-control" formControlName="login">
</div>
<div>
<label for="email">Email</label>
<input id="email" type="text" class="form-control" formControlName="email">
</div>
<div>
<label for="password">Password</label>
<input id="password" type="text" class="form-control" formControlName="password">
</div>
</div>
</div>
<div class="row" >
<div formGroupName="hobbies">
<div class="form-group">
<label>Hobbies array:</label>
<div *ngFor="let hobby of myForm.find('hobbies').controls; let i = index">
<div formGroupName="{{i}}">
<input id="hobby_{{i}}" type="text" class="form-control" formControlName="hobby">
<button *ngIf="myForm.find('hobbies').length > 1" (click)="removeHobby(i)">x</button>
</div>
</div>
<button (click)="onAddHobby()">Add hobby</button>
</div>
</div>
</div>
<button type="submit" [disabled]="!myForm.valid">Submit</button>
</form>
备注
this.myForm = this.formBuilder.group
使用用户的配置创建一个表单对象，并将其分配给this.myForm变量.
creates a form object with user's configuration and assigns it to this.myForm variable.
'loginCredentials': this.formBuilder.group
方法创建一组由 formControlName 组成的控件. login和值['', Validators.required],，其中第一个参数是表单输入的初始值，secons是验证器或验证器数组，如'email': ['', [Validators.required, customValidator]],所示.
method creates a group of controls which consist of a formControlName eg. login and value ['', Validators.required], where the first parameter is the initial value of the form input and the secons is a validator or an array of validators as in 'email': ['', [Validators.required, customValidator]],.
'hobbies': this.formBuilder.array
创建一个组数组，其中组的索引在该数组中为 formGroupName ，其访问方式如下:
Creates an array of groups where the index of the group is formGroupName in the array and is accessed like :
<div *ngFor="let hobby of myForm.find('hobbies').controls; let i = index">
<div formGroupName="{{i}}">...</div>
</div>
onAddHobby() {
(<FormArray>this.myForm.find('hobbies')).push(new FormGroup({
'hobby': new FormControl('', Validators.required)
}))
}
此样本方法将新的formGroup添加到数组.
当前访问需要指定我们要访问的控件的类型，在此示例中，此类型为:<FormArray>
this sample method adds new formGroup to the array.
Currently accessing requires specifing the type of control we want to access, in this example this type is : <FormArray>
removeHobby(index: number){
(<FormArray>this.myForm.find('hobbies')).removeAt(index);
}
与上述相同的规则适用于从数组中删除特定的表单控件
same rules as above apply to removing a specific form control from the array
这篇关于angular2中的嵌套形式的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
