Angular 2：不能绑定到'ngModel'，因为它不是'input'的已知属性 [英] Angular 2: Can't bind to 'ngModel' since it isn't a known property of 'input'
问题描述
我试图在Angular 2中实现动态表单。我已经为动态表单添加了删除和取消等附加功能。
我遵循这个文档：
我对代码做了一些更改。我在这里遇到错误。
我如何让这个错误发生？
你可以找到满的代码在这里： http://plnkr.co/edit/SL949g1hQQrnRUr1XXqt?p=preview ，这是在蹲点工作但不在我的本地系统中。
Html代码：
< ; DIV>
< form [formGroup] =form>
< div * ngFor =让问题提问class =form-row>
< label [attr.for] =question.key> {{question.label}}< / label>
< div [ngSwitch] =question.controlType>
< input * ngSwitchCase ='textbox'[formControlName] =question.key
[id] =question.key[type] =question.type [（ngModel）] = question.value >
< option * ngFor =let opt of question.options[ngValue] =opt.key> {{opt.value}}< / option>
< / select>
< input * ngSwitchCase =''checkbox'[（ngModel）] =question.value
[id] =question.key[type] =question。 type（change）=question.value = ck.checked#ck [ngModelOptions] ={standalone：true}>
< / div>
< div class =errorMessage* ngIf =！form.controls [question.key] .valid> {{question.label}}是必需的< / div>
< / div>
< div class =form-row>
< button type =submit[disabled] =！form.valid（click）=onSubmit（）>保存< / button>
< button type =buttonclass =btn btn-default（click）=cancel（）>取消< / button>
< button type =buttonclass =btn btn-default（click）=clear（）>清除< / button>
< / div>
< / form>
< div * ngIf =payLoadclass =form-row>
< strong>保存了以下值< / strong>< br> {{payLoad}}
< / div>
< / div>
组件代码：
<@ c $ c>从'@ angular / core'导入{Component，Input，OnInit};
从'@ angular / forms'导入{FormGroup，REACTIVE_FORM_DIRECTIVES};
从'./question-base'中导入{QuestionBase};
从'./question-control.service'中导入{QuestionControlService};
从'@ angular / common'导入{ControlGroup};
从'@ angular / core'导入{ChangeDetectorRef};
从'@ angular / forms'导入{FormsModule};
@Component（{
selector：'dynamic-form'，
templateUrl：'app / dynamicform / form.component.html'，
directives：[REACTIVE_FORM_DIRECTIVES ]，
providers：[QuestionControlService]
}）
export class DynamicFormComponent implements OnInit {
@Input（）question：QuestionBase< any> [] = [] ;
form：FormGroup;
payLoad：any;
payLoad2：任何;
questiont：QuestionBase< any>;
questiond：QuestionBase< any> ;;
构造函数（private qcs：QuestionControlService，private cdr：ChangeDetectorRef）{}
ngOnInit（）{
this.form = this.qcs.toFormGroup（this.questions）;
console.log（Form Init，this.questions）;
this.questiont = JSON.parse（JSON.stringify（this.questions））;
this.questiond = JSON.parse（JSON.stringify（this.questions））;
}
onSubmit（）{
this.payLoad = JSON.stringify（this.form.value）;
this.payLoad2 = this.payLoad;
this.questiont = JSON.parse（JSON.stringify（this.questions））;
console.log（提交数据，this.questions）;
}
cancel（）{
console.log（Cancelled）;
this.questions = JSON.parse（JSON.stringify（this.questiont））;
clear（）{
this.questions = JSON.parse（JSON.stringify（this.questiond））;
this.questiont = JSON.parse（JSON.stringify（this.questiond））;
console.log（清除）;
this.cdr.detectChanges（）;
}
}
找到这个解决方案，同时谷歌，更新您的@NgModule代码是这样的：
从'@ angular / core'导入{NgModule};
从'@ angular / platform-browser'导入{BrowserModule};
从'@ angular / forms'导入{FormsModule};
从'./app.component'导入{AppComponent};
$ b $ @NgModule（{
imports：[BrowserModule，FormsModule]，
declarations：[AppComponent]，
bootstrap：[AppComponent]
}）
导出类AppModule {}
来源：不能绑定到'ngModel'，因为它不是输入的已知属性。 I'm trying to implement Dynamic Forms in Angular 2. I've added additional functionalities like Delete and Cancel to the dynamic forms.
I've followed this documentation: https://angular.io/docs/ts/latest/cookbook/dynamic-form.html I've made some changes to the code. I'm getting error here. How do i make this error go? You can find the full code here: http://plnkr.co/edit/SL949g1hQQrnRUr1XXqt?p=preview , which is working in plunker but not in my local system. Html code: Component code:
Found this solution while Googling, update your @NgModule code like this : Source: Can’t bind to ‘ngModel’ since it isn’t a known property of ‘input’ 这篇关于Angular 2：不能绑定到'ngModel'，因为它不是'input'的已知属性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！<div>
<form [formGroup]="form">
<div *ngFor="let question of questions" class="form-row">
<label [attr.for]="question.key">{{question.label}}</label>
<div [ngSwitch]="question.controlType">
<input *ngSwitchCase="'textbox'" [formControlName]="question.key"
[id]="question.key" [type]="question.type" [(ngModel)]="question.value">
<select [id]="question.key" [(ngModel)]="question.value" *ngSwitchCase="'dropdown'" [formControlName]="question.key" >
<option *ngFor="let opt of question.options" [ngValue]="opt.key" >{{opt.value}}</option>
</select>
<input *ngSwitchCase="'checkbox'" [(ngModel)]="question.value"
[id]="question.key" [type]="question.type" (change)="question.value = ck.checked" #ck [ngModelOptions]="{standalone: true}">
</div>
<div class="errorMessage" *ngIf="!form.controls[question.key].valid">{{question.label}} is required</div>
</div>
<div class="form-row">
<button type="submit" [disabled]="!form.valid" (click)="onSubmit()">Save</button>
<button type="button" class="btn btn-default" (click)="cancel()">Cancel</button>
<button type="button" class="btn btn-default" (click)="clear()">Clear</button>
</div>
</form>
<div *ngIf="payLoad" class="form-row">
<strong>Saved the following values</strong><br>{{payLoad}}
</div>
</div>
import { Component, Input, OnInit } from '@angular/core';
import { FormGroup, REACTIVE_FORM_DIRECTIVES } from '@angular/forms';
import { QuestionBase } from './question-base';
import { QuestionControlService } from './question-control.service';
import { ControlGroup } from '@angular/common';
import {ChangeDetectorRef} from '@angular/core';
import { FormsModule } from '@angular/forms';
@Component({
selector: 'dynamic-form',
templateUrl: 'app/dynamicform/form.component.html',
directives: [REACTIVE_FORM_DIRECTIVES],
providers: [QuestionControlService]
})
export class DynamicFormComponent implements OnInit {
@Input() questions: QuestionBase<any>[] = [];
form: FormGroup;
payLoad:any;
payLoad2:any;
questiont: QuestionBase<any>;
questiond: QuestionBase<any>;
constructor(private qcs: QuestionControlService, private cdr: ChangeDetectorRef) { }
ngOnInit() {
this.form = this.qcs.toFormGroup(this.questions);
console.log("Form Init",this.questions);
this.questiont = JSON.parse(JSON.stringify(this.questions));
this.questiond = JSON.parse(JSON.stringify(this.questions));
}
onSubmit() {
this.payLoad = JSON.stringify(this.form.value);
this.payLoad2=this.payLoad;
this.questiont = JSON.parse(JSON.stringify(this.questions));
console.log("Submitted data",this.questions);
}
cancel(){
console.log("Canceled");
this.questions = JSON.parse(JSON.stringify(this.questiont));
}
clear(){
this.questions = JSON.parse(JSON.stringify(this.questiond));
this.questiont = JSON.parse(JSON.stringify(this.questiond));
console.log("Cleared");
this.cdr.detectChanges();
}
}
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
@NgModule({
imports: [ BrowserModule, FormsModule ],
declarations: [ AppComponent ],
bootstrap: [ AppComponent ]
})
export class AppModule { }
