我正在尝试在Angular 2中实现动态表单,我已经在动态表单中添加了像Delete和Cancel这样的附加功能。我遵循了这个文档:https://angular.io/docs/ts/latest/cookbook/dynamic-form.html
我对代码做了一些修改。我在这里得到了错误。
如何处理此错误?
你可以在这里找到完整的代码:http://plnkr.co/edit/SL949g1hQQrnRUr1XXqt?p=preview,它在plunker中工作,但在我的本地系统中不起作用。
Html代码:
<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>
组件代码:
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();
}
}
发布于 2016-08-11 17:43:56
想出一个快速的解决方案,像这样更新你的@NgModule代码:
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 { }
来源:Can’t bind to ‘ngModel’ since it isn’t a known property of ‘input’
发布于 2017-02-05 04:34:54
为了在使用AppModules (NgModule )时使ngModel工作,您必须在AppModule中导入FormsModule。
如下所示:
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule } from '@angular/forms';
import { AppComponent } from './app.component';
@NgModule({
declarations: [AppComponent],
imports: [BrowserModule, FormsModule],
bootstrap: [AppComponent]
})
export class AppModule {}
发布于 2016-08-11 02:30:34
在升级到RC5后,我遇到了类似的错误;即Angular 2:无法绑定到'ngModel‘,因为它不是'input’的已知属性。
Plunker上的代码显示您使用Angular2 RC4,但https://angular.io/docs/ts/latest/cookbook/dynamic-form.html上的示例代码使用的是NGModule,它是RC5的一部分。从RC4到RC5,NGModules是一个突破性的变化。
本页介绍了从RC4迁移到RC5的过程:https://angular.io/docs/ts/latest/cookbook/rc4-to-rc5.html
我希望这篇文章能解决你遇到的错误,并帮助你朝着正确的方向前进。
简而言之,我必须在app.module.ts中创建一个NGModule:
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 { }
然后我将main.ts更改为使用该模块:
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';
platformBrowserDynamic().bootstrapModule(AppModule);
当然,我还需要更新package.json中的依赖项。下面是我在package.json中的依赖项。诚然,我从其他来源(可能是ng文档示例)将它们拼凑在一起,所以您的里程数可能会有所不同:
...
"dependencies": {
"@angular/common": "2.0.0-rc.5",
"@angular/compiler": "2.0.0-rc.5",
"@angular/core": "2.0.0-rc.5",
"@angular/forms": "0.3.0",
"@angular/http": "2.0.0-rc.5",
"@angular/platform-browser": "2.0.0-rc.5",
"@angular/platform-browser-dynamic": "2.0.0-rc.5",
"@angular/router": "3.0.0-rc.1",
"@angular/router-deprecated": "2.0.0-rc.2",
"@angular/upgrade": "2.0.0-rc.5",
"systemjs": "0.19.27",
"core-js": "^2.4.0",
"reflect-metadata": "^0.1.3",
"rxjs": "5.0.0-beta.6",
"zone.js": "^0.6.12",
"angular2-in-memory-web-api": "0.0.15",
"bootstrap": "^3.3.6"
},
...
我希望这会有更好的帮助。:-)
https://stackoverflow.com/questions/38880150
复制相似问题