无法绑定到 '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 multi-select 下拉菜单。所以我使用了这个模块 -

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

但是在执行同上之后，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 component.html 中评论占位符时，我得到这个错误 -

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

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

HierarchySearchComponent - 这是您正在使用的组件 ng-multiselect-dropdown。

所以你可能 HierarchySearch.module.ts.

您只需从 imports:[] 中删除 NgMultiSelectDropDownModule.forRoot() 并在 HierarchySearch.module.ts[ 中导入=23=]。

它会起作用的。！

Answer 2

通常，当您错过某些导入时会出现此错误。如果缺少，请添加这些行：

import { BrowserModule } from '@angular/platform-browser'; import { FormsModule } from '@angular/forms';

Answer 3

在导入所有组件的 ComponentsModule 中添加多 select 导入。它对我有用。

Answer 4

检查你是否导入了 NgMultiSelectDropDownModule 导入到 module.ts

import { NgMultiSelectDropDownModule } from 'ng-multiselect-dropdown';

@NgModule({


imports: [
    NgMultiSelectDropDownModule
  ],

Answer 5

我也在使用 angular 7 但是我的问题已经解决了。我只是导入 NO_ERRORS_SCHEMA 并包含在包含 ng-multiselect-dropdown 模块的同一模块中 @NgModule:

import { NgModule ,NO_ERRORS_SCHEMA} from '@angular/core';
import { FormsModule } from '@angular/forms';


@NgModule({
  imports: [
    CommonModule,
    FormsModule,
    AngularMultiSelectModule,
  ],
  schemas:[NO_ERRORS_SCHEMA], 
})
export class SettingsModule { }

Answer 6

我遇到了这个问题并解决了添加

import { NgMultiSelectDropDownModule } from 'ng-multiselect-dropdown';

和

@NgModule({
imports: [
    NgMultiSelectDropDownModule
]
})

到 xxxx.module.ts 导入组件的文件而不是 app.module.ts 文件

无法绑定到 'placeholder'，因为它不是 'ng-multiselect-dropdown' 的已知属性

Can't bind to 'placeholder' since it isn't a known property of 'ng-multiselect-dropdown'

angular2-directives

angular2-services

angular

无法绑定到 'placeholder'，因为它不是 'ng-multiselect-dropdown' 的已知 属性

Can't bind to 'placeholder' since it isn't a known property of 'ng-multiselect-dropdown'

angular2-directives

angular2-services

angular

无法绑定到 'placeholder'，因为它不是 'ng-multiselect-dropdown' 的已知属性