angular - 无法绑定(bind)到 'placeholder'，因为它不是 'ng-multiselect-dropdown' 的已知属性

Question

我想实现自动完成功能，所以我发现一个相同的选项是使用多选下拉菜单。所以我使用了这个模块 -

https://www.npmjs.com/package/ng-multiselect-dropdown

但是在同上实现之后，我得到了这些错误 -

错误 -

ERROR Error: Uncaught (in promise): Error: Template parse errors:
Can't bind to 'placeholder' since it isn't a known property of 'ng- 
 multiselect-dropdown'.
1. If 'placeholder' is an Angular directive, then add 'CommonModule' 
 to the '@NgModule.imports' of this component.
2. To allow any property add 'NO_ERRORS_SCHEMA' to the 
'@NgModule.schemas' of this component. ("

<ng-multiselect-dropdown
[ERROR ->][placeholder]="'custom placeholder'"
  [data]="dropdownList"
  [(ngModel)]="selectedItems"
"): ng:///AdminLayoutModule/HierarchySearchComponent.html@7:0

当我在我的 component.html 中评论占位符时，我收到了这个错误 -

Can't bind to 'data' since it isn't a known property of 'ng- 
multiselect-dropdown'.
1. If 'data' is an Angular directive, then add 'CommonModule' to the 
'@NgModule.imports' of this component.
2. To allow any property add 'NO_ERRORS_SCHEMA' to the 
 '@NgModule.schemas' of this component.
   "
<ng-multiselect-dropdown
[placeholder]="'custom placeholder'"
  [ERROR ->][data]="dropdownList"
  [(ngModel)]="selectedItems"
  [settings]="dropdownSettings"
"): ng:///AdminLayoutModule/HierarchySearchComponent.html@8:2

并且类似的错误一直持续到最后一个属性。

更新

app.module.ts

import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import { RouterModule } from '@angular/router';
import { NgbModule } from '@ng-bootstrap/ng-bootstrap';


import { AppRoutingModule } from './app.routing';
import { ComponentsModule } from './components/components.module';

import { AppComponent } from './app.component';

import { AdminLayoutComponent } from './layouts/admin-layout/admin-layout.component';

//-------------  Imported Modules -------------------------

import { NgMultiSelectDropDownModule } from 'ng-multiselect-dropdown';
import { CommonModule } from '@angular/common';


@NgModule({
  imports: [
    BrowserAnimationsModule,
    FormsModule,
    HttpModule,
    ComponentsModule,
    RouterModule,
    AppRoutingModule,
    NgbModule.forRoot(),
    NgMultiSelectDropDownModule.forRoot(),
    CommonModule,


  ],
  declarations: [
    AppComponent,
    AdminLayoutComponent,


  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Answer 1

层次结构搜索组件 - 这是您正在使用的组件ng-multiselect-dropdown .

所以可能你会有 HierarchySearch.module.ts .

您只需删除 NgMultiSelectDropDownModule.forRoot() 从 app.module.ts 中的 imports:[] 和 中导入HierarchySearch.module.ts .

它会工作的。!