带有子组件和验证的Angular 2嵌套表单 [英] Angular 2 nested forms with child components and validation
问题描述
我正在尝试通过Angular 2中的验证来实现嵌套表单，我看过帖子并关注文档，但是我真的很努力，希望您能为我指明正确的方向.
我想要实现的是拥有一个包含多个子组件的经过验证的表单.这些子组件有点复杂，其中一些具有更多子组件，但是出于这个问题，我认为我们可以解决有父母和孩子的问题.
我要完成什么
具有这样的形式:
<div [formGroup]="userForm" novalidate>
<div>
<label>User Id</label>
<input formControlName="userId">
</div>
<div>
<label>Dummy</label>
<input formControlName="dummyInput">
</div>
</div>
这需要有一个像这样的课程:
private userForm: FormGroup;
constructor(private fb: FormBuilder){
this.createForm();
}
private createForm(): void{
this.userForm = this.fb.group({
userId: ["", Validators.required],
dummyInput: "", Validators.required]
});
}
这可以按预期工作，但是现在我想解耦代码，并将"dummyInput"功能放在一个单独的不同组件中.这是我迷路的地方.这是我尝试过的方法，我想我离答案不远，但是我真的没有想法，我对现场还很陌生:
parent.component.html
<div [formGroup]="userForm" novalidate>
<div>
<label>User Id</label>
<input formControlName="userId">
</div>
<div>
<dummy></dummy>
</div>
</div>
parent.component.ts
private createForm(): void{
this.userForm = this.fb.group({
userId: ["", Validators.required],
dummy: this.fb.group({
dummyInput: ["", Validators.required]
})
});
children.component.html
<div [formGroup]="dummyGroup">
<label>Dummy Input: </label>
<input formControlName="dummyInput">
</div>
children.component.ts
private dummyGroup: FormGroup;
我知道代码不正确，但是我确实遇到了障碍.任何帮助将不胜感激.
谢谢.
主要思想是必须将formGroup和formControls视为变量，主要是javascript对象和数组.
因此，我将添加一些代码来说明我的观点.下面的代码有点像您所拥有的.表单是动态构造的，只是将其分为多个部分，每个部分都包含其共享的字段和标签.
HTML由打字稿类备份.那些不在这里，因为它们没有什么特别之处.仅FormSchemaUI，FormSectionUI和FormFieldUI很重要.
将每段代码作为自己的文件处理.
还请注意， formSchema:FormSchema 是我从服务接收到的JSON对象.您未看到定义的UI类的任何属性都继承自其基本Data类.这些未在此处显示. 层次结构为:FormSchema包含多个部分.一个部分包含多个字段.
<form (ngSubmit)="onSubmit()" #ciRegisterForm="ngForm" [formGroup]="formSchemaUI.MainFormGroup">
<button kendoButton (click)="onSubmit(ciRegisterForm)" [disabled]="!canSubmit()"> Register {{registerPageName}} </button>
<br /><br />
<app-ci-register-section *ngFor="let sectionUI of formSchemaUI.SectionsUI" [sectionUI]="sectionUI">
</app-ci-register-section>
<button kendoButton (click)="onSubmit(ciRegisterForm)" [disabled]="!canSubmit()"> Register {{registerPageName}} </button>
</form>
============================================
<div class="row" [formGroup]="sectionUI.MainFormGroup">
<div class="col-md-12 col-lg-12" [formGroupName]="sectionUI.SectionDisplayId">
<fieldset class="section-border">
<legend class="section-border">{{sectionUI.Title}}</legend>
<ng-container *ngFor='let fieldUI of sectionUI.FieldsUI; let i=index; let even = even;'>
<div class="row" *ngIf="even">
<ng-container>
<div class="col-md-6 col-lg-6" app-ci-field-label-tuple [fieldUI]="fieldUI">
</div>
</ng-container>
<ng-container *ngIf="sectionUI.Fields[i+1]">
<div class="col-md-6 col-lg-6" app-ci-field-label-tuple [fieldUI]="sectionUI.FieldsUI[i+1]">
</div>
</ng-container>
</div>
</ng-container>
</fieldset>
</div>
</div>
============================================
{{fieldUI.Label}}
============================================
<ng-container>
<div class="row">
<div class="col-md-4 col-lg-4 text-right">
<label for="{{fieldUI.FieldDisplayId}}"> {{fieldUI.Label}} </label>
</div>
<div class="col-md-8 col-lg-8">
<div app-ci-field-edit [fieldUI]="fieldUI" ></div>
</div>
</div>
</ng-container>
============================================
<ng-container [formGroup]="fieldUI.ParentSectionFormGroup">
<ng-container *ngIf="fieldUI.isEnabled">
<ng-container [ngSwitch]="fieldUI.ColumnType">
<input *ngSwitchCase="'HIDDEN'" type="hidden" id="{{fieldUI.FieldDisplayId}}" [value]="fieldUI.Value" />
<ci-field-textbox *ngSwitchDefault
[fieldUI]="fieldUI"
(valueChange)="onValueChange($event)"
class="fullWidth" style="width:100%">
</ci-field-textbox>
</ng-container>
</ng-container>
</ng-container>
============================================
export class FormSchemaUI extends FormSchema {
SectionsUI: Array<FormSectionUI>;
MainFormGroup: FormGroup;
static fromFormSchemaData(formSchema: FormSchema): FormSchemaUI {
let formSchemaUI = new FormSchemaUI(formSchema);
formSchemaUI.SectionsUI = new Array<FormSectionUI>();
formSchemaUI.Sections.forEach(section => {
let formSectionUI = FormSectionUI.fromFormSectionData(section);
formSchemaUI.SectionsUI.push(formSectionUI);
});
formSchemaUI.MainFormGroup = FormSchemaUI.buildMainFormGroup(formSchemaUI);
return formSchemaUI;
}
static buildMainFormGroup(formSchemaUI: FormSchemaUI): FormGroup {
let obj = {};
formSchemaUI.SectionsUI.forEach(sectionUI => {
obj[sectionUI.SectionDisplayId] = sectionUI.SectionFormGroup;
});
let sectionFormGroup = new FormGroup(obj);
return sectionFormGroup;
}
}
============================================
export class FormSectionUI extends FormSection {
constructor(formSection: FormSection) {
this.SectionDisplayId = 'section' + this.SectionId.toString();
}
SectionDisplayId: string;
FieldsUI: Array<FormFieldUI>;
HiddenFieldsUI: Array<FormFieldUI>;
SectionFormGroup: FormGroup;
MainFormGroup: FormGroup;
ParentFormSchemaUI: FormSchemaUI;
static fromFormSectionData(formSection: FormSection): FormSectionUI {
let formSectionUI = new FormSectionUI(formSection);
formSectionUI.FieldsUI = new Array<FormFieldUI>();
formSectionUI.HiddenFieldsUI = new Array<FormFieldUI>();
formSectionUI.Fields.forEach(field => {
let fieldUI = FormFieldUI.fromFormFieldData(field);
if (fieldUI.ColumnType != 'HIDDEN')
formSectionUI.FieldsUI.push(fieldUI);
else formSectionUI.HiddenFieldsUI.push(fieldUI);
});
formSectionUI.SectionFormGroup = FormSectionUI.buildFormSectionFormGroup(formSectionUI);
return formSectionUI;
}
static buildFormSectionFormGroup(formSectionUI: FormSectionUI): FormGroup {
let obj = {};
formSectionUI.FieldsUI.forEach(fieldUI => {
obj[fieldUI.FieldDisplayId] = fieldUI.FieldFormControl;
});
let sectionFormGroup = new FormGroup(obj);
return sectionFormGroup;
}
}
============================================
export class FormFieldUI extends FormField {
constructor(formField: FormField) {
super();
this.FieldDisplayId = 'field' + this.FieldId.toString();
this.ListItems = new Array<SelectListItem>();
}
public FieldDisplayId: string;
public FieldFormControl: FormControl;
public ParentSectionFormGroup: FormGroup;
public MainFormGroup: FormGroup;
public ParentFormSectionUI: FormSectionUI;
public ValueChange: EventEmitter<any> = new EventEmitter<any>();
static buildFormControl(formFieldUI:FormFieldUI): FormControl {
let nullValidator = Validators.nullValidator;
let fieldKey: string = formFieldUI.FieldDisplayId;
let fieldValue: any;
switch (formFieldUI.ColumnType) {
default:
fieldValue = formFieldUI.Value;
break;
}
let isDisabled = !formFieldUI.IsEnabled;
let validatorsArray: ValidatorFn[] = new Array<ValidatorFn>();
let asyncValidatorsArray: AsyncValidatorFn[] = new Array<AsyncValidatorFn>();
let formControl = new FormControl({ value: fieldValue, disabled: isDisabled }, validatorsArray, asyncValidatorsArray);
return formControl;
}
}
I'm trying achieve a nested form with validation in Angular 2, I've seen posts and followed the documentation but I'm really struggling, hope you can point me in the right direction.
What I am trying to achieve is having a validated form with multiple children components. These children components are a bit complex, some of them have more children components, but for the sake of the question I think we can attack the problem having a parent and a children.
What am I trying to accomplish
Having a form that works like this:
<div [formGroup]="userForm" novalidate>
<div>
<label>User Id</label>
<input formControlName="userId">
</div>
<div>
<label>Dummy</label>
<input formControlName="dummyInput">
</div>
</div>
This requires having a class like this:
private userForm: FormGroup;
constructor(private fb: FormBuilder){
this.createForm();
}
private createForm(): void{
this.userForm = this.fb.group({
userId: ["", Validators.required],
dummyInput: "", Validators.required]
});
}
This works as expected, but now I want to decouple the code, and put the "dummyInput" functionality in a separate, different component. This is where I get lost. This is what I tried, I think I'm not far from getting the answer, but I'm really out of ideas, I'm fairly new to the scene:
parent.component.html
<div [formGroup]="userForm" novalidate>
<div>
<label>User Id</label>
<input formControlName="userId">
</div>
<div>
<dummy></dummy>
</div>
</div>
parent.component.ts
private createForm(): void{
this.userForm = this.fb.group({
userId: ["", Validators.required],
dummy: this.fb.group({
dummyInput: ["", Validators.required]
})
});
children.component.html
<div [formGroup]="dummyGroup">
<label>Dummy Input: </label>
<input formControlName="dummyInput">
</div>
children.component.ts
private dummyGroup: FormGroup;
I know something is not right with the code, but I'm really in a roadblock. Any help would be aprreciated.
Thanks.
The main idea is that you have to treat the formGroup and formControls as variables, mainly javascript objects and arrays.
So I'll put some code in to make my point. The code below is somewhat like what you have. The form is constructed dynamically, just that it is split into sections, each section containing its share of fields and labels.
The HTML is backed up by typescript classes. Those are not here as they do not have much special. Just the FormSchemaUI, FormSectionUI and FormFieldUI are important.
Treat each piece of code as its own file.
Also please take note that formSchema: FormSchema is a JSON object that I receive from a service. Any properties of the UI classes that you do not see defined are inherited from their base Data clases. Those are not presented here. The hierarchy is: FormSchema contains multiple sections. A section contains multiple fields.
<form (ngSubmit)="onSubmit()" #ciRegisterForm="ngForm" [formGroup]="formSchemaUI.MainFormGroup">
<button kendoButton (click)="onSubmit(ciRegisterForm)" [disabled]="!canSubmit()"> Register {{registerPageName}} </button>
<br /><br />
<app-ci-register-section *ngFor="let sectionUI of formSchemaUI.SectionsUI" [sectionUI]="sectionUI">
</app-ci-register-section>
<button kendoButton (click)="onSubmit(ciRegisterForm)" [disabled]="!canSubmit()"> Register {{registerPageName}} </button>
</form>
=============================================
<div class="row" [formGroup]="sectionUI.MainFormGroup">
<div class="col-md-12 col-lg-12" [formGroupName]="sectionUI.SectionDisplayId">
<fieldset class="section-border">
<legend class="section-border">{{sectionUI.Title}}</legend>
<ng-container *ngFor='let fieldUI of sectionUI.FieldsUI; let i=index; let even = even;'>
<div class="row" *ngIf="even">
<ng-container>
<div class="col-md-6 col-lg-6" app-ci-field-label-tuple [fieldUI]="fieldUI">
</div>
</ng-container>
<ng-container *ngIf="sectionUI.Fields[i+1]">
<div class="col-md-6 col-lg-6" app-ci-field-label-tuple [fieldUI]="sectionUI.FieldsUI[i+1]">
</div>
</ng-container>
</div>
</ng-container>
</fieldset>
</div>
</div>
=============================================
{{fieldUI.Label}}
=============================================
<ng-container>
<div class="row">
<div class="col-md-4 col-lg-4 text-right">
<label for="{{fieldUI.FieldDisplayId}}"> {{fieldUI.Label}} </label>
</div>
<div class="col-md-8 col-lg-8">
<div app-ci-field-edit [fieldUI]="fieldUI" ></div>
</div>
</div>
</ng-container>
=============================================
<ng-container [formGroup]="fieldUI.ParentSectionFormGroup">
<ng-container *ngIf="fieldUI.isEnabled">
<ng-container [ngSwitch]="fieldUI.ColumnType">
<input *ngSwitchCase="'HIDDEN'" type="hidden" id="{{fieldUI.FieldDisplayId}}" [value]="fieldUI.Value" />
<ci-field-textbox *ngSwitchDefault
[fieldUI]="fieldUI"
(valueChange)="onValueChange($event)"
class="fullWidth" style="width:100%">
</ci-field-textbox>
</ng-container>
</ng-container>
</ng-container>
=============================================
export class FormSchemaUI extends FormSchema {
SectionsUI: Array<FormSectionUI>;
MainFormGroup: FormGroup;
static fromFormSchemaData(formSchema: FormSchema): FormSchemaUI {
let formSchemaUI = new FormSchemaUI(formSchema);
formSchemaUI.SectionsUI = new Array<FormSectionUI>();
formSchemaUI.Sections.forEach(section => {
let formSectionUI = FormSectionUI.fromFormSectionData(section);
formSchemaUI.SectionsUI.push(formSectionUI);
});
formSchemaUI.MainFormGroup = FormSchemaUI.buildMainFormGroup(formSchemaUI);
return formSchemaUI;
}
static buildMainFormGroup(formSchemaUI: FormSchemaUI): FormGroup {
let obj = {};
formSchemaUI.SectionsUI.forEach(sectionUI => {
obj[sectionUI.SectionDisplayId] = sectionUI.SectionFormGroup;
});
let sectionFormGroup = new FormGroup(obj);
return sectionFormGroup;
}
}
=============================================
export class FormSectionUI extends FormSection {
constructor(formSection: FormSection) {
this.SectionDisplayId = 'section' + this.SectionId.toString();
}
SectionDisplayId: string;
FieldsUI: Array<FormFieldUI>;
HiddenFieldsUI: Array<FormFieldUI>;
SectionFormGroup: FormGroup;
MainFormGroup: FormGroup;
ParentFormSchemaUI: FormSchemaUI;
static fromFormSectionData(formSection: FormSection): FormSectionUI {
let formSectionUI = new FormSectionUI(formSection);
formSectionUI.FieldsUI = new Array<FormFieldUI>();
formSectionUI.HiddenFieldsUI = new Array<FormFieldUI>();
formSectionUI.Fields.forEach(field => {
let fieldUI = FormFieldUI.fromFormFieldData(field);
if (fieldUI.ColumnType != 'HIDDEN')
formSectionUI.FieldsUI.push(fieldUI);
else formSectionUI.HiddenFieldsUI.push(fieldUI);
});
formSectionUI.SectionFormGroup = FormSectionUI.buildFormSectionFormGroup(formSectionUI);
return formSectionUI;
}
static buildFormSectionFormGroup(formSectionUI: FormSectionUI): FormGroup {
let obj = {};
formSectionUI.FieldsUI.forEach(fieldUI => {
obj[fieldUI.FieldDisplayId] = fieldUI.FieldFormControl;
});
let sectionFormGroup = new FormGroup(obj);
return sectionFormGroup;
}
}
=============================================
export class FormFieldUI extends FormField {
constructor(formField: FormField) {
super();
this.FieldDisplayId = 'field' + this.FieldId.toString();
this.ListItems = new Array<SelectListItem>();
}
public FieldDisplayId: string;
public FieldFormControl: FormControl;
public ParentSectionFormGroup: FormGroup;
public MainFormGroup: FormGroup;
public ParentFormSectionUI: FormSectionUI;
public ValueChange: EventEmitter<any> = new EventEmitter<any>();
static buildFormControl(formFieldUI:FormFieldUI): FormControl {
let nullValidator = Validators.nullValidator;
let fieldKey: string = formFieldUI.FieldDisplayId;
let fieldValue: any;
switch (formFieldUI.ColumnType) {
default:
fieldValue = formFieldUI.Value;
break;
}
let isDisabled = !formFieldUI.IsEnabled;
let validatorsArray: ValidatorFn[] = new Array<ValidatorFn>();
let asyncValidatorsArray: AsyncValidatorFn[] = new Array<AsyncValidatorFn>();
let formControl = new FormControl({ value: fieldValue, disabled: isDisabled }, validatorsArray, asyncValidatorsArray);
return formControl;
}
}
这篇关于带有子组件和验证的Angular 2嵌套表单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！
