Can't bind to 'configuration' since it isn't a known property of 'ng-material-multilevel-menu'

Question

I am using ng-material-multilevel-menu plugin to create multilevel dropdown. I am following this article, but getting below runtime error

Can't bind to 'configuration' since it isn't a known property of 'ng-material-multilevel-menu'. 1. If 'configuration' 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.

Can't bind to 'items' since it isn't a known property of 'ng-material-multilevel-menu'. 1. If 'items' 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-material-multilevel-menu' is not a known element: 1. If 'ng-material-multilevel-menu' is an Angular component, then verify that it is part of this module. 2. If 'ng-material-multilevel-menu' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.

This is my code in .html file

 <div>
  <ng-material-multilevel-menu [configuration]='config' [items]='appitems' (selectedItem)="selectedItem($event)">
  </ng-material-multilevel-menu>
 </div>

This is my code in .ts file

import { Component, OnInit, NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { NgMaterialMultilevelMenuModule } from 'ng-material-multilevel-menu';
import { AppComponent } from '../app.component';

@Component({
  selector: 'app-products',
  templateUrl: './products.component.html',
  styleUrls: ['./products.component.css']
})

@NgModule({
  declarations: [
  ],
  imports: [
    BrowserModule,
    NgMaterialMultilevelMenuModule // Import here
  ],
  providers: [],
  bootstrap: [AppComponent]
})


export class ProductsComponent implements OnInit {

  constructor(private employeeService: ProductService) {
  }

  ngOnInit() {

     var appitems = [
        {
          label: 'Item 1 (with Font awesome icon)',
          faIcon: 'fab fa-500px',
          items: [
            {
              label: 'Item 1.1',
              link: '/item-1-1',
              faIcon: 'fab fa-accusoft'
            },
            {
              label: 'Item 1.2',
              faIcon: 'fab fa-accessible-icon',
              items: [
                {
                  label: 'Item 1.2.1',
                  link: '/item-1-2-1',
                  faIcon: 'fas fa-allergies'
                },
                {
                  label: 'Item 1.2.2',
                  faIcon: 'fas fa-ambulance',
                  items: [
                    {
                      label: 'Item 1.2.2.1',
                      link: 'item-1-2-2-1',
                      faIcon: 'fas fa-anchor'
                    }
                  ]
                }
              ]
            }
          ]
        },
      ];

    });
}

How can I solve this issue?

Answer 1

Remove @NgModule section from this component file. Add NgMaterialMultilevelMenuModule in imports section of your app.module.ts file.

And declare appitems as global variable above the constructor like below:

export class ProductsComponent implements OnInit {

  appitems: any = [];
  constructor(private employeeService: ProductService) {
  }

  ngOnInit() {

     this.appitems = [
        {
          label: 'Item 1 (with Font awesome icon)',
          faIcon: 'fab fa-500px',
          items: [
            {
              label: 'Item 1.1',
              link: '/item-1-1',
              faIcon: 'fab fa-accusoft'
            },
            {
              label: 'Item 1.2',
              faIcon: 'fab fa-accessible-icon',
              items: [
                {
                  label: 'Item 1.2.1',
                  link: '/item-1-2-1',
                  faIcon: 'fas fa-allergies'
                },
                {
                  label: 'Item 1.2.2',
                  faIcon: 'fas fa-ambulance',
                  items: [
                    {
                      label: 'Item 1.2.2.1',
                      link: 'item-1-2-2-1',
                      faIcon: 'fas fa-anchor'
                    }
                  ]
                }
              ]
            }
          ]
        },
      ];

    });
}