“无法绑定到 'ngModel',因为它不是 'p-calendar' 的已知属性”尝试使用 PrimeNG 组件的错误消息,为啥?
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【中文标题】“无法绑定到 \'ngModel\',因为它不是 \'p-calendar\' 的已知属性”尝试使用 PrimeNG 组件的错误消息,为啥?【英文标题】:"Can't bind to 'ngModel' since it isn't a known property of 'p-calendar'" error message trying to use PrimeNG component, why?“无法绑定到 'ngModel',因为它不是 'p-calendar' 的已知属性”尝试使用 PrimeNG 组件的错误消息,为什么? 【发布时间】:2018-01-19 20:24:58 【问题描述】:我是 Angular 2\4 的新手,我正在尝试按照这个快速视频教程将 PrimeNG 组件添加到我的 Angular 项目中:
https://www.youtube.com/watch?v=6Nvze0dhzkE
以及 PrimeNG 教程页面的开始部分:https://www.primefaces.org/primeng/#/setup
这是我的app.component.html
观点:
<!--The whole content below can be removed with the new code.-->
<div style="text-align:center">
<h1>
Welcome to title!!
</h1>
</div>
<p-calendar [(ngModel)]="value"></p-calendar>
value | date:'dd.mm.yyy'
如您所见,我已插入此标记以显示日历组件:
<p-calendar [(ngModel)]="value"></p-calendar>
(在该组件的官方文档中也显示:https://www.primefaces.org/primeng/#/calendar)
这里我遇到了第一个问题,因为 IntelliJ 给了我这个错误信息:
Error:(9, 13) Angular: Can't bind to 'ngModel' since it isn't a known property of 'p-calendar'.
1. If 'p-calendar' is an Angular component and it has 'ngModel' input, then verify that it is part of this module.
2. If 'p-calendar' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
3. To allow any property add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component.
我认为这很奇怪,因为这行应该将用户在日历上选择的值绑定到我模型的 value 变量。
按照教程,我以这种方式修改了app.module.ts
文件:
import BrowserModule from '@angular/platform-browser';
import NgModule from '@angular/core';
import AppComponent from './app.component';
import CalendarModule from 'primeng/primeng';
@NgModule(
declarations: [
AppComponent
],
imports: [
BrowserModule,
CalendarModule
],
providers: [],
bootstrap: [AppComponent]
)
export class AppModule
export class MyModel
value: Date;
正如你在这里看到的,我已经导出了这个类:
export class MyModel
value: Date;
具有 value 属性(类型为 Date),因此它应该是视图中此行所绑定的属性:
<p-calendar [(ngModel)]="value"></p-calendar>
但它无法工作,当我在 javascript 浏览器控制台中访问此应用程序时,我收到以下错误消息:
compiler.es5.js:1690 Uncaught Error: Template parse errors:
Can't bind to 'ngModel' since it isn't a known property of 'p-calendar'.
1. If 'p-calendar' is an Angular component and it has 'ngModel' input, then verify that it is part of this module.
2. If 'p-calendar' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
3. To allow any property add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component. ("<p-calendar [ERROR ->][(ngModel)]="value"></p-calendar value | date:'dd.mm.yyy'
"): ng:///AppModule/AppComponent.html@8:12
at syntaxError (http://localhost:4200/vendor.bundle.js:7283:34)
at TemplateParser.webpackJsonp../node_modules/@angular/compiler/@angular/compiler.es5.js.TemplateParser.parse (http://localhost:4200/vendor.bundle.js:18403:19)
at JitCompiler.webpackJsonp../node_modules/@angular/compiler/@angular/compiler.es5.js.JitCompiler._compileTemplate (http://localhost:4200/vendor.bundle.js:32555:39)
at http://localhost:4200/vendor.bundle.js:32475:62
at Set.forEach (native)
at JitCompiler.webpackJsonp../node_modules/@angular/compiler/@angular/compiler.es5.js.JitCompiler._compileComponents (http://localhost:4200/vendor.bundle.js:32475:19)
at http://localhost:4200/vendor.bundle.js:32362:19
at Object.then (http://localhost:4200/vendor.bundle.js:7272:148)
at JitCompiler.webpackJsonp../node_modules/@angular/compiler/@angular/compiler.es5.js.JitCompiler._compileModuleAndComponents (http://localhost:4200/vendor.bundle.js:32361:26)
at JitCompiler.webpackJsonp../node_modules/@angular/compiler/@angular/compiler.es5.js.JitCompiler.compileModuleAsync (http://localhost:4200/vendor.bundle.js:32290:37)
syntaxError @ compiler.es5.js:1690
webpackJsonp../node_modules/@angular/compiler/@angular/compiler.es5.js.TemplateParser.parse @ compiler.es5.js:12810
webpackJsonp../node_modules/@angular/compiler/@angular/compiler.es5.js.JitCompiler._compileTemplate @ compiler.es5.js:26962
(anonymous) @ compiler.es5.js:26882
webpackJsonp../node_modules/@angular/compiler/@angular/compiler.es5.js.JitCompiler._compileComponents @ compiler.es5.js:26882
(anonymous) @ compiler.es5.js:26769
then @ compiler.es5.js:1679
webpackJsonp../node_modules/@angular/compiler/@angular/compiler.es5.js.JitCompiler._compileModuleAndComponents @ compiler.es5.js:26768
webpackJsonp../node_modules/@angular/compiler/@angular/compiler.es5.js.JitCompiler.compileModuleAsync @ compiler.es5.js:26697
webpackJsonp../node_modules/@angular/core/@angular/core.es5.js.PlatformRef_._bootstrapModuleWithZone @ core.es5.js:4536
webpackJsonp../node_modules/@angular/core/@angular/core.es5.js.PlatformRef_.bootstrapModule @ core.es5.js:4522
./src/main.ts @ main.ts:11
__webpack_require__ @ bootstrap a55b161…:54
2 @ main.ts:11
__webpack_require__ @ bootstrap a55b161…:54
webpackJsonpCallback @ bootstrap a55b161…:25
(anonymous)
为什么?怎么了?我错过了什么?我该如何尝试解决此问题?在我看来,我遵循了教程......
【问题讨论】:
【参考方案1】:在您的AppModule
中添加FormsModule
:
// ...
import FormsModule from '@angular/forms';
// ...
@NgModule(
// ...
imports: [
BrowserModule,
FormsModule,
CalendarModule
],
// ...
)
export class AppModule
【讨论】:
Tnx 有效。我的疑问是:我为什么要添加 FromModule?是不是因为这个(ngModel)是这个模块中声明的东西? 当我们有 ngIf ,ngFor, ngModel 等 @AndreaNobili 时使用表单模块【参考方案2】:这不会解决你的问题,但我在尝试使用 formControlName 属性时遇到了同样的错误:
<p-calendar [(ngModel)]="value" formControlName="debutaffichage"></p-calendar>
【讨论】:
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