import { Component,Input, Injectable, ApplicationRef, ChangeDetectorRef, ChangeDetectionStrategy } from '@angular/core';
import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
import { Multiselect } from './multiselect.component';
import { Observable, of, timer } from 'rxjs';
import { Pipe, PipeTransform } from '@angular/core';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { FormGroup, FormControl } from '@angular/forms';
import { LoremIpsumService } from './services/loremIpsum.service';

@Component({
    selector: 'my-app',
    templateUrl: 'templates/app.html',
    changeDetection: ChangeDetectionStrategy.OnPush
})

export class AppComponent implements OnInit {
    public items: Observable<Array<any>>;
    public selectedItems: Observable<Array<any>>;
    public _selectedItems: Array<any> = [];
    public watchedItems: Array<any>;
    private _items: Array<any>;
    private _lipsum: any;
  
    constructor(private changeRef: ChangeDetectorRef, private appRef: ApplicationRef, private lipsumSvc: LoremIpsumService) {
        this._items = [];
        this.items = of(this._items);
        this.items.subscribe(res => { console.log("Items changed"); this.watchedItems = res; });
        //this.selectedItems = Observable.of(this._selectedItems);
        //this.selectedItems.subscribe(res => { console.log("Selected Items changed"); });
    }
    
    createItems() {
      this._items.length = 0;
      var max: int = 20;
      var min: int = 10;
      var numItems: int = Math.floor(Math.random() * (max - min + 1)) + min; 
      console.log("Adding " + numItems.toString() + " items");
      max = 6;
      min = 3;
      var i: int;
      for (i =0; i < numItems; i++) {
        var numWords: int = Math.floor(Math.random() * (max - min + 1)) + min;
        var label: string = this.lipsumSvc.generate(numWords); 
        this._items.push({ label: label, value: i.toString()});
          console.log(label);
      }
      
      // Randomly choose a few items
      this.randomSelect();
    }
    
    randomSelect() {
      var numItems: int = this.getRandomInt(0, this._items.length) + 1;
      var min: int = 0;
      var max: int = this._items.length - 1;
      var toSelectIndexes: Array<int> = [];
      for (var j: int = 0; j < this.getRandomInt(1, numItems); j++) {
          var randIndex: int = this.getRandomInt(min, max);
          var arrIndex = toSelectIndexes.indexOf(randIndex);
          if (arrIndex == -1) {
              toSelectIndexes.push(randIndex);
              var item: any = this._items[randIndex];
              item.checked = true;
              this._selectedItems.push(this._items[randIndex]);
          }
      }
    }
    
    getRandomInt(min: int, max: int) {
      return Math.floor(Math.random() * (max - min + 1) + min);
    }
    
    onChange(newValue) {
        console.log('received change event');
    }
        
    ngOnInit() {
      this.createItems();
      let myTimer = timer(20000,20000);
      myTimer.subscribe(t=> {
        //this.createItems();
      });
    }
}

@Pipe({
    name: 'equal',
    pure: false
})

export class EqualPipe implements PipeTransform {
    transform(items: any, filter: any): any {
      if (filter && Array.isArray(items)) {
          let filterKeys = Object.keys(filter);
          return items.filter(item =>
              filterKeys.reduce((memo, keyName) => {
                  //console.log("Comparing");
                  return item[keyName] === filter[keyName];}, true)
                  );
      } else {
          return items;
      }
    }
}

import { Component, NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { JsonpModule } from '@angular/http';
import { NgbModule } from '@ng-bootstrap/ng-bootstrap';
import { Multiselect, FilterPipe } from './multiselect.component';
import { Multiselect, CheckedPipe } from './multiselect.component';
import { AppComponent, EqualPipe } from './app.component';
import { LoremIpsumService } from './services/loremIpsum.service';

@NgModule({
  imports: [
    BrowserModule,
    FormsModule,
    ReactiveFormsModule,
    JsonpModule,
    NgbModule.forRoot(),
  ],
  declarations: [AppComponent, Multiselect, FilterPipe, EqualPipe],
  bootstrap: [AppComponent],
  providers: [EqualPipe, LoremIpsumService],
})
export class AppModule {}
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { AppModule } from './app.module';

const platform = platformBrowserDynamic();
platform.bootstrapModule(AppModule);
import {Component,Input,Output,OnInit,ViewChild,EventEmitter,ChangeDetectionStrategy, ChangeDetectorRef, HostListener, Renderer, ElementRef, forwardRef} from '@angular/core';
import { Pipe, PipeTransform } from '@angular/core';
import { Observable, Subscription, fromEvent } from 'rxjs';
import { debounceTime, distinctUntilChanged, throttleTime } from 'rxjs/operators';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { FormGroup, FormControl } from '@angular/forms';
import {ControlValueAccessor, NG_VALUE_ACCESSOR} from '@angular/forms';
import { EqualPipe } from './app.component';

@Pipe({
    name: 'filter'
})

export class FilterPipe implements PipeTransform {
    transform(items: any, filter: any): any {
      if (filter && Array.isArray(items)) {
          let filterKeys = Object.keys(filter);
          return items.filter(item =>
              filterKeys.reduce((memo, keyName) =>
                  (memo && new RegExp(filter[keyName], 'gi').test(item[keyName])) || filter[keyName] === "", true));
      } else {
          return items;
      }
    }
}

const MULTISELECT_VALUE_ACCESSOR = {
  provide: NG_VALUE_ACCESSOR,
  useExisting: forwardRef(() => Multiselect),
  multi: true
};

@Component({
    selector: 'multiselect',
    templateUrl: 'templates/multiselect.html',
    host: {'(change)': 'manualChange($event)' },
    providers: [MULTISELECT_VALUE_ACCESSOR]
})

export class Multiselect implements OnInit, ControlValueAccessor {
  public _items: Array<any>;
  public _selectedItems: Array<any>;
  public localHeader: string;
  public isOpen: bool = false;
  public enableFilter: bool;
  public filterText: string;
  public filterPlaceholder: string;
  public filterInput = new FormControl();
  private _subscription: Subscription;
  @Input() items: Observable<any[]>;
  @Input() header: string = "Select some stuff";
  @Input() selectedHeader: string = "options selected";
  
  // ControlValueAccessor Interface and mutator
  private _onChange = (_: any) => {};
  private _onTouched = () => {};
  
    constructor(private _elRef: ElementRef, private _renderer: Renderer, private _equalPipe: EqualPipe, private _changeDetectorRef: ChangeDetectorRef) {
  }
  
  get selected(): any {
      return this._selectedItems;
      console.log('got value');
  };
  
  writeValue(value: any) {
    console.log('writing value ' + value);
   if (value !== undefined) {
      this._selectedItems = value;
    } else  {
      this._selectedItems = [];
    }
  }
  
  setHeaderText() {
    this.localHeader = this.header;
    var isArray = this._selectedItems instanceof Array;
    if (isArray && this._selectedItems.length > 1) {
      this.localHeader = this._selectedItems.length + ' ' + this.selectedHeader;
    } else if (isArray && this._selectedItems.length === 1) {
      this.localHeader = this._selectedItems[0].label;
    }
    console.log("Set header text " + this.localHeader);
  }
  
   registerOnChange(fn: (value: any) => any): void { this._onChange = fn; console.log(fn); }
   registerOnTouched(fn: () => any): void { this._onTouched = fn; }
  
  setDisabledState(isDisabled: boolean): void {
    this._renderer.setElementProperty(this._elRef.nativeElement, 'disabled', isDisabled);
//    if (this.isOpen()) {
//      this._cRef.instance.setDisabledState(isDisabled);
//    }
  }

    manualChange() {
      this._onChange(this._selectedItems);
    }
  
  select(item: any) {
    item.checked = !item.checked;
    this._selectedItems = this._equalPipe.transform(this._items, {checked: true});
    this.setHeaderText();
    this._onChange(this._selectedItems);
  }
  
  toggleSelect() {
    this.isOpen = !this.isOpen;
  }
  
  clearFilter() {
    this.filterText = "";
  }
  
  @HostListener('document:click', ['$event'])
  hostClick(event) {
   if (this.isOpen && !this._elRef.nativeElement.contains(event.target))
     this.isOpen = false;
  }
  
  ngOnInit() {
        this._subscription = this.items.subscribe(res => this._items = res);
        this.enableFilter = true;
        this.filterText = "";
        this.filterPlaceholder = "Filter..";
        this._selectedItems = this._equalPipe.transform(this._items, { checked: true });
        this.setHeaderText();
        this.filterInput
            .valueChanges
            .pipe(debounceTime(200))
            .pipe(distinctUntilChanged())
            .subscribe(term => {
                this.filterText = term;
                this._changeDetectorRef.markForCheck();
                console.log(term);
            });
  }
}
import { Injectable } from '@angular/core';

@Injectable()
export class LoremIpsumService {
    private WORDS_PER_SENTENCE_AVG: number = 24.260;
    private WORDS_PER_SENTENCE_STD: number = 5.080;

    private WORDS: Array<string> = [
        'lorem', 'ipsum', 'dolor', 'sit', 'amet', 'consectetur',
        'adipiscing', 'elit', 'curabitur', 'vel', 'hendrerit', 'libero',
        'eleifend', 'blandit', 'nunc', 'ornare', 'odio', 'ut',
        'orci', 'gravida', 'imperdiet', 'nullam', 'purus', 'lacinia',
        'a', 'pretium', 'quis', 'congue', 'praesent', 'sagittis',
        'laoreet', 'auctor', 'mauris', 'non', 'velit', 'eros',
        'dictum', 'proin', 'accumsan', 'sapien', 'nec', 'massa',
        'volutpat', 'venenatis', 'sed', 'eu', 'molestie', 'lacus',
        'quisque', 'porttitor', 'ligula', 'dui', 'mollis', 'tempus',
        'at', 'magna', 'vestibulum', 'turpis', 'ac', 'diam',
        'tincidunt', 'id', 'condimentum', 'enim', 'sodales', 'in',
        'hac', 'habitasse', 'platea', 'dictumst', 'aenean', 'neque',
        'fusce', 'augue', 'leo', 'eget', 'semper', 'mattis',
        'tortor', 'scelerisque', 'nulla', 'interdum', 'tellus', 'malesuada',
        'rhoncus', 'porta', 'sem', 'aliquet', 'et', 'nam',
        'suspendisse', 'potenti', 'vivamus', 'luctus', 'fringilla', 'erat',
        'donec', 'justo', 'vehicula', 'ultricies', 'varius', 'ante',
        'primis', 'faucibus', 'ultrices', 'posuere', 'cubilia', 'curae',
        'etiam', 'cursus', 'aliquam', 'quam', 'dapibus', 'nisl',
        'feugiat', 'egestas', 'class', 'aptent', 'taciti', 'sociosqu',
        'ad', 'litora', 'torquent', 'per', 'conubia', 'nostra',
        'inceptos', 'himenaeos', 'phasellus', 'nibh', 'pulvinar', 'vitae',
        'urna', 'iaculis', 'lobortis', 'nisi', 'viverra', 'arcu',
        'morbi', 'pellentesque', 'metus', 'commodo', 'ut', 'facilisis',
        'felis', 'tristique', 'ullamcorper', 'placerat', 'aenean', 'convallis',
        'sollicitudin', 'integer', 'rutrum', 'duis', 'est', 'etiam',
        'bibendum', 'donec', 'pharetra', 'vulputate', 'maecenas', 'mi',
        'fermentum', 'consequat', 'suscipit', 'aliquam', 'habitant', 'senectus',
        'netus', 'fames', 'quisque', 'euismod', 'curabitur', 'lectus',
        'elementum', 'tempor', 'risus', 'cras'
    ];

    constructor() {
    }

    public singleWord(): string {
        var position = Math.floor(Math.random() * this.WORDS.length);
        var word = this.WORDS[position];
        return word.charAt(0).toUpperCase() + word.slice(1);
    };

    public generate(num_words: number) {
        var words, ii, position, word, current, sentences, sentence_length, sentence;

        /**
         * @default 100
         */
        num_words = num_words || 100;

        words = [this.WORDS[0], this.WORDS[1]];
        num_words -= 2;

        for (ii = 0; ii < num_words; ii++) {
            position = Math.floor(Math.random() * this.WORDS.length);
            word = this.WORDS[position];

            if (ii > 0 && words[ii - 1] === word) {
                ii -= 1;

            } else {
                words[ii] = word;
            }
        }

        sentences = [];
        current = 0;

        while (num_words > 0) {
            sentence_length = this.getRandomSentenceLength();

            if (num_words - sentence_length < 4) {
                sentence_length = num_words;
            }

            num_words -= sentence_length;

            sentence = [];

            for (ii = current; ii < (current + sentence_length); ii++) {
                sentence.push(words[ii]);
            }

            sentence = this.punctuate(sentence);
            current += sentence_length;
            sentences.push(sentence.join(' '));
        }

        return sentences.join(' ');
    };

    public punctuate(sentence: any) {
        var word_length, num_commas, ii, position;

        word_length = sentence.length;

        /* End the sentence with a period. */
        sentence[word_length - 1] += '.';

        if (word_length < 4) {
            return sentence;
        }

        num_commas = this.getRandomCommaCount(word_length);

        for (ii = 0; ii <= num_commas; ii++) {
            position = Math.round(ii * word_length / (num_commas + 1));

            if (position < (word_length - 1) && position > 0) {
                /* Add the comma. */
                sentence[position] += ',';
            }
        }

        /* Capitalize the first word in the sentence. */
        sentence[0] = sentence[0].charAt(0).toUpperCase() + sentence[0].slice(1);

        return sentence;
    }

    public getRandomCommaCount(word_length: number) {
        var base, average, standard_deviation;

        /* Arbitrary. */
        base = 6;

        average = Math.log(word_length) / Math.log(base);
        standard_deviation = average / base;

        return Math.round(this.gaussMS(average, standard_deviation));
    }

    public getRandomSentenceLength() {
        return Math.round(
            this.gaussMS(
                this.WORDS_PER_SENTENCE_AVG,
                this.WORDS_PER_SENTENCE_STD
            )
        );
    }

    private gauss() {
        return (Math.random() * 2 - 1) +
            (Math.random() * 2 - 1) +
            (Math.random() * 2 - 1);
    }

    private gaussMS(mean: number, standard_deviation: number) {
        return Math.round(this.gauss() * standard_deviation + mean);
    }
}
/* Master Styles */

h1 {
  color: #369;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 250%;
}

h2,
h3 {
  color: #444;
  font-family: Arial, Helvetica, sans-serif;
  font-weight: lighter;
}

body {
  margin: 2em;
}

body,
input[text],
button {
  color: #888;
  font-family: Cambria, Georgia;
}

a {
  cursor: pointer;
  cursor: hand;
}

button {
  font-family: Arial;
  background-color: #eee;
  border: none;
  padding: 5px 10px;
  border-radius: 4px;
  cursor: pointer;
  cursor: hand;
}

.has-error button {
  border-color: #d9534f;
}

.has-error small {
  color: #d9534f !important;
  padding-top: 10px;
}

button:hover {
  background-color: #cfd8dc;
}

button:disabled {
  background-color: #eee;
  color: #aaa;
  cursor: auto;
}

/* Navigation link styles */

nav a {
  padding: 5px 10px;
  text-decoration: none;
  margin-top: 10px;
  display: inline-block;
  background-color: #eee;
  border-radius: 4px;
}

nav a:visited,
a:link {
  color: #607d8b;
}

nav a:hover {
  color: #039be5;
  background-color: #cfd8dc;
}

nav a.active {
  color: #039be5;
}

/* items class */

.items {
  margin: 0 0 2em 0;
  list-style-type: none;
  padding: 0;
  width: 24em;
}

.items li {
  cursor: pointer;
  position: relative;
  left: 0;
  background-color: #eee;
  margin: 0.5em;
  padding: 0.3em 0;
  height: 1.6em;
  border-radius: 4px;
}

.items li:hover {
  color: #607d8b;
  background-color: #ddd;
  left: 0.1em;
}

.items li.selected:hover {
  background-color: #bbd8dc;
  color: white;
}

.items .text {
  position: relative;
  top: -3px;
}

.items {
  margin: 0 0 2em 0;
  list-style-type: none;
  padding: 0;
  width: 24em;
}

.items li {
  cursor: pointer;
  position: relative;
  left: 0;
  background-color: #eee;
  margin: 0.5em;
  padding: 0.3em 0;
  height: 1.6em;
  border-radius: 4px;
}

.items li:hover {
  color: #607d8b;
  background-color: #ddd;
  left: 0.1em;
}

.items li.selected {
  background-color: #cfd8dc;
  color: white;
}

.items li.selected:hover {
  background-color: #bbd8dc;
}

.items .text {
  position: relative;
  top: -3px;
}

.items .badge {
  display: inline-block;
  font-size: small;
  color: white;
  padding: 0.8em 0.7em 0 0.7em;
  background-color: #607d8b;
  line-height: 1em;
  position: relative;
  left: -1px;
  top: -4px;
  height: 1.8em;
  margin-right: 0.8em;
  border-radius: 4px 0 0 4px;
}

/* everywhere else */

* {
  font-family: Arial, Helvetica, sans-serif;
}

multiselect {
  display: block;
}

multiselect > .btn-group {
  min-width: 180px;
}

multiselect .dropdown-toggle:after {
  content: none;
}

multiselect .btn {
  width: 100%;
  background-color: #fff;
}

multiselect .btn.has-error {
  border: 1px solid #a94442 !important;
  color: #db524b;
}

multiselect .dropdown-menu {
  max-height: 300px;
  min-width: 200px;
  overflow-y: auto;
}

multiselect .dropdown-menu .filter > input {
  width: 99%;
}

multiselect .dropdown-menu .filter .clear-filter {
  cursor: pointer;
  pointer-events: all;
  position: absolute;
  top: 0;
  right: 0;
  z-index: 2;
  display: block;
  width: 34px;
  height: 34px;
  line-height: 34px;
  text-align: center;
}

multiselect .dropdown-menu {
  /* width: 100%; */
  box-sizing: border-box;
  padding: 2px;
}

multiselect > .btn-group > button {
  padding-right: 20px;
}

multiselect > .btn-group > button > .pull-left {
  color: black;
}

multiselect > .btn-group > button:hover > .pull-left {
  color: white;
}

multiselect > .btn-group > button > .caret {
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 4px solid black;
  right: 5px;
  top: 45%;
  position: absolute;
}

multiselect .dropdown-menu > li > a {
  padding: 3px 10px;
  cursor: pointer;
}
multiselect .dropdown-menu > li > a i {
  margin-right: 4px;
}
.glyphicon-none:before {
  content: '\e013';
  color: transparent !important;
}
<!DOCTYPE html>
<html>

<head>
	<title>Angular 7 Multiselect Checkbox Dropdown</title>
	<meta charset="UTF-8" />
	<meta name="viewport" content="width=device-width, initial-scale=1" />
	<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" />
	<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.4.0/css/font-awesome.min.css" />
	<link rel="stylesheet" href="styles.css" />
	<!-- 1. Load libraries -->
	<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/2.2.4/jquery.min.js">
	</script>
	<script src="spin.js">
	</script>
	<script src="jquery.spin.js">
	</script>
	<!-- Polyfill(s) for older browsers -->
	<script src="https://unpkg.com/core-js/client/shim.min.js">
	</script>
	<script src="https://unpkg.com/zone.js@0.8.26/dist/zone.js?main=browser">
	</script>
	<script src="https://unpkg.com/reflect-metadata@0.1.12">
	</script>
	<script src="https://unpkg.com/systemjs@0.19.47/dist/system.src.js">
	</script>
	<!-- 2. Configure SystemJS -->
	<script src="systemjs.config.js">
	</script>
	<script>
		System.import('app').catch(function(err){ console.error(err); });
	</script>
</head>

<!-- 3. Display the application -->

<body>
	<my-app>Loading...</my-app>
</body>

</html>
### This is a demo plunker

This is a demo/plunker I'm working on for a custom Angular multiselect dropdown component with validation integration
(function (global) {
  var angularVersion = '@7.1.4';
  
  System.config({
    // DEMO ONLY! REAL CODE SHOULD NOT TRANSPILE IN THE BROWSER
    transpiler: 'ts',
    typescriptOptions: {
      // Copy of compiler options in standard tsconfig.json
      "target": "es5",
      "module": "commonjs",
      "moduleResolution": "node",
      "sourceMap": true,
      "emitDecoratorMetadata": true,
      "experimentalDecorators": true,
      "lib": ["es2015", "dom"],
      "noImplicitAny": true,
      "suppressImplicitAnyIndexErrors": true
    },
    meta: {
      'typescript': {
        "exports": "ts"
      }
    },
    paths: {
      // paths serve as alias
      'npm:': 'https://unpkg.com/'
    },
    // map tells the System loader where to look for things
    map: {
      // our app is within the app folder
      'app': 'app',
      service: 'serivce',
      
      // angular bundles
      '@angular/core': 'npm:@angular/core' + angularVersion + '/bundles/core.umd.js',
      '@angular/common': 'npm:@angular/common' + angularVersion + '/bundles/common.umd.js',
      '@angular/common/http': 'npm:@angular/common' + angularVersion + '/bundles/common-http.umd.js',
      '@angular/compiler': 'npm:@angular/compiler' + angularVersion + '/bundles/compiler.umd.js',
      '@angular/platform-browser': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser.umd.js',
      '@angular/platform-browser/animations': 'npm:@angular/platform-browser' + angularVersion + '/bundles/platform-browser-animations.umd.js',
      '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic' + angularVersion + '/bundles/platform-browser-dynamic.umd.js',
      '@angular/platform-webworker': 'npm:@angular/platform-webworker' + angularVersion + '/bundles/platform-webworker.umd.js',
      '@angular/platform-webworker-dynamic': 'npm:@angular/platform-webworker-dynamic' + angularVersion + '/bundles/platform-webworker-dynamic.umd.js',   
      '@angular/http': 'npm:@angular/http' + angularVersion + '/bundles/http.umd.js',
      '@angular/router': 'npm:@angular/router' + angularVersion + '/bundles/router.umd.js',
      '@angular/router/upgrade': 'npm:@angular/router' + angularVersion + '/bundles/router-upgrade.umd.js',
      '@angular/forms': 'npm:@angular/forms' + angularVersion + '/bundles/forms.umd.js',
      '@angular/upgrade': 'npm:@angular/upgrade' + angularVersion + '/bundles/upgrade.umd.js',
      '@angular/upgrade/static': 'npm:@angular/upgrade' + angularVersion + '/bundles/upgrade-static.umd.js',
      '@angular/animations': 'npm:@angular/animations' + angularVersion + '/bundles/animations.umd.js',
      '@angular/animations/browser': 'npm:@angular/animations' + angularVersion + '/bundles/animations-browser.umd.js',
      
      // other libraries
      'rxjs':                      'npm:rxjs@6.3.3',
      'rxjs-compat':               'npm:rxjs-compat@6.3.3',
      'ts':                        'npm:plugin-typescript@8.0.0/lib/plugin.js',
      'tslib':                     'npm:tslib@1.9.3',
      'typescript':                'npm:typescript@3.2.2/lib/typescript.js',
      'angular-in-memory-web-api': 'npm:angular-in-memory-web-api@0.8.0/bundles/in-memory-web-api.umd.js',
      '@ng-bootstrap/ng-bootstrap': 'npm:@ng-bootstrap/ng-bootstrap@4.0.1/bundles/ng-bootstrap.umd.js'
    },
    // packages tells the System loader how to load when no filename and/or no extension
    packages: {
      app: {
        main: './main.ts',
        defaultExtension: 'ts',
        meta: {
          './*.ts': {
            loader: 'systemjs-angular-loader.js'
          }
        }
      },
      service: {
        defaultExtension: 'ts'
      },
      'rxjs': {main: 'index.js', defaultExtension: 'js' },
      'rxjs/ajax': {main: 'index.js', defaultExtension: 'js' },
      'rxjs/operators': {main: 'index.js', defaultExtension: 'js' },
      'rxjs/testing': {main: 'index.js', defaultExtension: 'js' },
      'rxjs/webSocket': {main: 'index.js', defaultExtension: 'js' }
      }
  });

})(this);
{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": true,
    "suppressImplicitAnyIndexErrors": true,
    "types": []
  },
  "exclude": [
    "node_modules/*",
    "**/*-aot.ts"
  ]
}
<form class="container-fluid">
  <hr>
  <p>
    This demo plnkr is the beginning of an Angular <strong>Multiselect</strong> component/project: Angular powered Bootstrap. Visit <a href="https://long2know.com/" target="_blank">https://long2know.com</a> for more demos and discussion..
  </p>
  <hr>

  <div class="form-group" [ngClass]="{'has-error':!itemsFormElement.valid}">
    <multiselect id="items" name="items" #itemsFormElement="ngModel" class="pull-left" [items]="items" [(ngModel)]="_selectedItems" (ngModelChange)="onChange($event)" required></multiselect>
    <small [hidden]="itemsFormElement.valid" class="form-text text-muted danger">You must select an item.</small>
  </div>


  <!--
  <ul class="pull-right">
    <li *ngFor="let item of watchedItems | equal:{checked: true}">{{ item.label }}</li>
  </ul>
  -->

  <ul class="pull-right">
    <li *ngFor="let item of _selectedItems">{{ item.label }}</li>
  </ul>
</form>
<div class="btn-group">
  <button type="button" class="btn btn-secondary dropdown-toggle" (click)="toggleSelect()">
    <span class="pull-left" [innerHtml]="localHeader"></span>
    <span class="caret pull-right"></span>
  </button>
  <ul class="dropdown-menu multi-select-popup" [ngStyle]="{display:isOpen ? 'block' : 'none'}" style="display:block;">
    <li *ngIf="enableFilter" class="filter-container">
      <div class="form-group has-feedback filter">
        <input class="form-control" type="text" [value]="filterText" [placeholder]="filterPlaceholder" [formControl]="filterInput" />
        <span class="clear-filter fa fa-times-circle-o form-control-feedback" (click)="clearFilter()"></span>
      </div>
    </li>
    <li *ngFor="let item of _items | filter:{label:filterText}">
      <a (click)="select(item)" class="dropdown-item">
        <i class="fa fa-fw" [ngClass]="{'fa-check': item.checked, 'glyphicon-none': !item.checked}"></i>
        <span [innerHtml]="item.label"></span>
      </a>
    </li>
  </ul>
</div>

<br/>
<br/>
<br/>
<br/>


<!--

<div class="btn-group" ng-class="{ dropup: dropup, single: !multiple }">
    <button type="button" class="btn btn-default dropdown-toggle" ng-click="toggleSelect()" ng-disabled="disabled" ng-class="{'has-error': !valid()}">
        <span class="pull-left" ng-bind="localHeader"></span>
        <span class="caret pull-right"></span>
    </button>
    <ul class="dropdown-menu multi-select-popup" ng-show="isOpen && !moveInProgress" ng-style="{ true: {top: position.top +'px', left: position.left +'px'}, false: {}}[appendToBody]" style="display: block;" role="listbox" aria-hidden="{{!isOpen}}">
        <li *ngIf="enableFilter" class="filter-container">
            <div class="form-group has-feedback filter">
                <input class="form-control" type="text" ng-model="searchText.label" placeholder="{{ filterPlaceholder }}" />
                <span class="glyphicon glyphicon-remove-circle form-control-feedback" ng-click="clearFilter()"></span>
            </div>
        </li>
        <li ng-show="multiple && (enableCheckAll || enableUncheckAll)">
            <button ng-if="enableCheckAll" type="button" class="btn-link btn-small" ng-click="checkAll()"><i class="icon-ok"></i> {{ checkAllLabel }}</button>
            <button ng-if="enableUncheckAll" type="button" class="btn-link btn-small" ng-click="uncheckAll()"><i class="icon-remove"></i> {{ uncheckAllLabel }}</button>
        </li>
        <li ng-show="maxSelected">
            <small>Selected maximum of </small><small ng-bind="selectLimit"></small>
        </li>
        <li ng-repeat="i in items | filter:searchText">
            <a ng-click="select(i);">
                <i class="glyphicon" ng-class="{'glyphicon-ok': i.checked, 'glyphicon-none': !i.checked}"></i>
                <span ng-bind="i.label"></span>
            </a>
        </li>
    </ul>
</div>

-->
this.sharedData.tabSet.select(id);
console.log(this.sharedData.tabSet);
Observable.create(observer => {
    setTimeout(() => {
        this.sharedData.tabSet.select(id)
        observer.complete();
        console.log("Observer complete");
    }, 1);
})
.subscribe(
  result => {
      this.sharedData.tabSet.select(id);
      console.log("subscription complete");
  },
  err => console.error(err),
  () => {
      this.sharedData.tabSet.select(id);
      console.log(this.sharedData.tabSet.activeId);
      console.log('done');
  }
);


setTimeout(() => {
    this._watch = Observable.from(this.ngbTabset.tabs);
    this._watch.subscribe(
      x => console.log('onNext: %s', x),
      e => console.log('onError: %s', e),
      () => {
          var index = this.ngbTabset.tabs.length - 1;
          var lastTab = this.ngbTabset.tabs.last;
          console.log(this.ngbTabset.tabs);
          console.log(index);
          console.log(lastTab);
          this.ngbTabset.select(lastTab.id);
          console.log('onCompleted');
      });
})
var templateUrlRegex = /templateUrl\s*:(\s*['"`](.*?)['"`]\s*)/gm;
var stylesRegex = /styleUrls *:(\s*\[[^\]]*?\])/g;
var stringRegex = /(['`"])((?:[^\\]\\\1|.)*?)\1/g;

module.exports.translate = function(load){
  if (load.source.indexOf('moduleId') != -1) return load;

  var url = document.createElement('a');
  url.href = load.address;

  var basePathParts = url.pathname.split('/');

  basePathParts.pop();
  var basePath = basePathParts.join('/');

  var baseHref = document.createElement('a');
  baseHref.href = this.baseURL;
  baseHref = baseHref.pathname;

  if (!baseHref.startsWith('/base/')) { // it is not karma
    basePath = basePath.replace(baseHref, '');
  }

  load.source = load.source
    .replace(templateUrlRegex, function(match, quote, url){
      var resolvedUrl = url;

      if (url.startsWith('.')) {
        resolvedUrl = basePath + url.substr(1);
      }

      return 'templateUrl: "' + resolvedUrl + '"';
    })
    .replace(stylesRegex, function(match, relativeUrls) {
      var urls = [];

      while ((match = stringRegex.exec(relativeUrls)) !== null) {
        if (match[2].startsWith('.')) {
          urls.push('"' + basePath + match[2].substr(1) + '"');
        } else {
          urls.push('"' + match[2] + '"');
        }
      }

      return "styleUrls: [" + urls.join(', ') + "]";
    });

  return load;
};
/**
 * Copyright (c) 2011-2013 Felix Gnass
 * Licensed under the MIT license
 */
(function (root, factory) {

    /* CommonJS */
    if (typeof exports == 'object') module.exports = factory()

        /* AMD module */
    else if (typeof define == 'function' && define.amd) define(factory)

        /* Browser global */
    else root.Spinner = factory()
}
(this, function () {
    "use strict";

    var prefixes = ['webkit', 'Moz', 'ms', 'O'] /* Vendor prefixes */
      , animations = {} /* Animation rules keyed by their name */
      , useCssAnimations /* Whether to use CSS animations or setTimeout */

    /**
     * Utility function to create elements. If no tag name is given,
     * a DIV is created. Optionally properties can be passed.
     */
    function createEl(tag, prop) {
        var el = document.createElement(tag || 'div')
          , n

        for (n in prop) el[n] = prop[n]
        return el
    }

    /**
     * Appends children and returns the parent.
     */
    function ins(parent /* child1, child2, ...*/) {
        for (var i = 1, n = arguments.length; i < n; i++)
            parent.appendChild(arguments[i])

        return parent
    }

    /**
     * Insert a new stylesheet to hold the @keyframe or VML rules.
     */
    var sheet = (function () {
        var el = createEl('style', { type: 'text/css' })
        ins(document.getElementsByTagName('head')[0], el)
        return el.sheet || el.styleSheet
    }())

    /**
     * Creates an opacity keyframe animation rule and returns its name.
     * Since most mobile Webkits have timing issues with animation-delay,
     * we create separate rules for each line/segment.
     */
    function addAnimation(alpha, trail, i, lines) {
        var name = ['opacity', trail, ~~(alpha * 100), i, lines].join('-')
          , start = 0.01 + i / lines * 100
          , z = Math.max(1 - (1 - alpha) / trail * (100 - start), alpha)
          , prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase()
          , pre = prefix && '-' + prefix + '-' || ''

        if (!animations[name]) {
            sheet.insertRule(
              '@' + pre + 'keyframes ' + name + '{' +
              '0%{opacity:' + z + '}' +
              start + '%{opacity:' + alpha + '}' +
              (start + 0.01) + '%{opacity:1}' +
              (start + trail) % 100 + '%{opacity:' + alpha + '}' +
              '100%{opacity:' + z + '}' +
              '}', sheet.cssRules.length)

            animations[name] = 1
        }

        return name
    }

    /**
     * Tries various vendor prefixes and returns the first supported property.
     */
    function vendor(el, prop) {
        var s = el.style
          , pp
          , i

        prop = prop.charAt(0).toUpperCase() + prop.slice(1)
        for (i = 0; i < prefixes.length; i++) {
            pp = prefixes[i] + prop
            if (s[pp] !== undefined) return pp
        }
        if (s[prop] !== undefined) return prop
    }

    /**
     * Sets multiple style properties at once.
     */
    function css(el, prop) {
        for (var n in prop)
            el.style[vendor(el, n) || n] = prop[n]

        return el
    }

    /**
     * Fills in default values.
     */
    function merge(obj) {
        for (var i = 1; i < arguments.length; i++) {
            var def = arguments[i]
            for (var n in def)
                if (obj[n] === undefined) obj[n] = def[n]
        }
        return obj
    }

    /**
     * Returns the absolute page-offset of the given element.
     */
    function pos(el) {
        var o = { x: el.offsetLeft, y: el.offsetTop }
        while ((el = el.offsetParent))
            o.x += el.offsetLeft, o.y += el.offsetTop

        return o
    }

    /**
     * Returns the line color from the given string or array.
     */
    function getColor(color, idx) {
        return typeof color == 'string' ? color : color[idx % color.length]
    }

    // Built-in defaults

    var defaults = {
        lines: 12,            // The number of lines to draw
        length: 7,            // The length of each line
        width: 5,             // The line thickness
        radius: 10,           // The radius of the inner circle
        rotate: 0,            // Rotation offset
        corners: 1,           // Roundness (0..1)
        color: '#000',        // #rgb or #rrggbb
        direction: 1,         // 1: clockwise, -1: counterclockwise
        speed: 1,             // Rounds per second
        trail: 100,           // Afterglow percentage
        opacity: 1 / 4,         // Opacity of the lines
        fps: 20,              // Frames per second when using setTimeout()
        zIndex: 2e9,          // Use a high z-index by default
        className: 'spinner', // CSS class to assign to the element
        top: 'auto',          // center vertically
        left: 'auto',         // center horizontally
        position: 'relative'  // element position
    }

    /** The constructor */
    function Spinner(o) {
        if (typeof this == 'undefined') return new Spinner(o)
        this.opts = merge(o || {}, Spinner.defaults, defaults)
    }

    // Global defaults that override the built-ins:
    Spinner.defaults = {}

    merge(Spinner.prototype, {

        /**
         * Adds the spinner to the given target element. If this instance is already
         * spinning, it is automatically removed from its previous target b calling
         * stop() internally.
         */
        spin: function (target) {
            this.stop()

            var self = this
              , o = self.opts
              , el = self.el = css(createEl(0, { className: o.className }), { position: o.position, width: 0, zIndex: o.zIndex })
              , mid = o.radius + o.length + o.width
              , ep // element position
              , tp // target position

            if (target) {
                target.insertBefore(el, target.firstChild || null)
                tp = pos(target)
                ep = pos(el)
                css(el, {
                    left: (o.left == 'auto' ? tp.x - ep.x + (target.offsetWidth >> 1) : parseInt(o.left, 10) + mid) + 'px',
                    top: (o.top == 'auto' ? tp.y - ep.y + (target.offsetHeight >> 1) : parseInt(o.top, 10) + mid) + 'px'
                })
            }

            el.setAttribute('role', 'progressbar')
            self.lines(el, self.opts)

            if (!useCssAnimations) {
                // No CSS animation support, use setTimeout() instead
                var i = 0
                  , start = (o.lines - 1) * (1 - o.direction) / 2
                  , alpha
                  , fps = o.fps
                  , f = fps / o.speed
                  , ostep = (1 - o.opacity) / (f * o.trail / 100)
                  , astep = f / o.lines

                ; (function anim() {
                    i++;
                    for (var j = 0; j < o.lines; j++) {
                        alpha = Math.max(1 - (i + (o.lines - j) * astep) % f * ostep, o.opacity)

                        self.opacity(el, j * o.direction + start, alpha, o)
                    }
                    self.timeout = self.el && setTimeout(anim, ~~(1000 / fps))
                })()
            }
            return self
        },

        /**
         * Stops and removes the Spinner.
         */
        stop: function () {
            var el = this.el
            if (el) {
                clearTimeout(this.timeout)
                if (el.parentNode) el.parentNode.removeChild(el)
                this.el = undefined
            }
            return this
        },

        /**
         * Internal method that draws the individual lines. Will be overwritten
         * in VML fallback mode below.
         */
        lines: function (el, o) {
            var i = 0
              , start = (o.lines - 1) * (1 - o.direction) / 2
              , seg

            function fill(color, shadow) {
                return css(createEl(), {
                    position: 'absolute',
                    width: (o.length + o.width) + 'px',
                    height: o.width + 'px',
                    background: color,
                    boxShadow: shadow,
                    transformOrigin: 'left',
                    transform: 'rotate(' + ~~(360 / o.lines * i + o.rotate) + 'deg) translate(' + o.radius + 'px' + ',0)',
                    borderRadius: (o.corners * o.width >> 1) + 'px'
                })
            }

            for (; i < o.lines; i++) {
                seg = css(createEl(), {
                    position: 'absolute',
                    top: 1 + ~(o.width / 2) + 'px',
                    transform: o.hwaccel ? 'translate3d(0,0,0)' : '',
                    opacity: o.opacity,
                    animation: useCssAnimations && addAnimation(o.opacity, o.trail, start + i * o.direction, o.lines) + ' ' + 1 / o.speed + 's linear infinite'
                })

                if (o.shadow) ins(seg, css(fill('#000', '0 0 4px ' + '#000'), { top: 2 + 'px' }))
                ins(el, ins(seg, fill(getColor(o.color, i), '0 0 1px rgba(0,0,0,.1)')))
            }
            return el
        },

        /**
         * Internal method that adjusts the opacity of a single line.
         * Will be overwritten in VML fallback mode below.
         */
        opacity: function (el, i, val) {
            if (i < el.childNodes.length) el.childNodes[i].style.opacity = val
        }

    })


    function initVML() {

        /* Utility function to create a VML tag */
        function vml(tag, attr) {
            return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr)
        }

        // No CSS transforms but VML support, add a CSS rule for VML elements:
        sheet.addRule('.spin-vml', 'behavior:url(#default#VML)')

        Spinner.prototype.lines = function (el, o) {
            var r = o.length + o.width
              , s = 2 * r

            function grp() {
                return css(
                  vml('group', {
                      coordsize: s + ' ' + s,
                      coordorigin: -r + ' ' + -r
                  }),
                  { width: s, height: s }
                )
            }

            var margin = -(o.width + o.length) * 2 + 'px'
              , g = css(grp(), { position: 'absolute', top: margin, left: margin })
              , i

            function seg(i, dx, filter) {
                ins(g,
                  ins(css(grp(), { rotation: 360 / o.lines * i + 'deg', left: ~~dx }),
                    ins(css(vml('roundrect', { arcsize: o.corners }), {
                        width: r,
                        height: o.width,
                        left: o.radius,
                        top: -o.width >> 1,
                        filter: filter
                    }),
                      vml('fill', { color: getColor(o.color, i), opacity: o.opacity }),
                      vml('stroke', { opacity: 0 }) // transparent stroke to fix color bleeding upon opacity change
                    )
                  )
                )
            }

            if (o.shadow)
                for (i = 1; i <= o.lines; i++)
                    seg(i, -2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)')

            for (i = 1; i <= o.lines; i++) seg(i)
            return ins(el, g)
        }

        Spinner.prototype.opacity = function (el, i, val, o) {
            var c = el.firstChild
            o = o.shadow && o.lines || 0
            if (c && i + o < c.childNodes.length) {
                c = c.childNodes[i + o]; c = c && c.firstChild; c = c && c.firstChild
                if (c) c.opacity = val
            }
        }
    }

    var probe = css(createEl('group'), { behavior: 'url(#default#VML)' })

    if (!vendor(probe, 'transform') && probe.adj) initVML()
    else useCssAnimations = vendor(probe, 'animation')

    return Spinner

}));
/**
 * Copyright (c) 2011-2013 Felix Gnass
 * Licensed under the MIT license
 */

/*

Basic Usage:
============

$('#el').spin(); // Creates a default Spinner using the text color of #el.
$('#el').spin({ ... }); // Creates a Spinner using the provided options.

$('#el').spin(false); // Stops and removes the spinner.

Using Presets:
==============

$('#el').spin('small'); // Creates a 'small' Spinner using the text color of #el.
$('#el').spin('large', '#fff'); // Creates a 'large' white Spinner.

Adding a custom preset:
=======================

$.fn.spin.presets.flower = {
  lines: 9
  length: 10
  width: 20
  radius: 0
}

$('#el').spin('flower', 'red');

*/

(function (factory) {

    if (typeof exports == 'object') {
        // CommonJS
        factory(require('jquery'), require('spin'))
    }
    else if (typeof define == 'function' && define.amd) {
        // AMD, register as anonymous module
        define(['jquery', 'spin'], factory)
    }
    else {
        // Browser globals
        if (!window.Spinner) throw new Error('Spin.js not present')
        factory(window.jQuery, window.Spinner)
    }

}(function ($, Spinner) {
    var modal_opts = {
        lines: 11, // The number of lines to draw
        length: 23, // The length of each line
        width: 8, // The line thickness
        radius: 40, // The radius of the inner circle
        corners: 1, // Corner roundness (0..1)
        rotate: 9, // The rotation offset
        color: '#FFF', // #rgb or #rrggbb
        speed: 1, // Rounds per second
        trail: 50, // Afterglow percentage
        shadow: true, // Whether to render a shadow
        hwaccel: false, // Whether to use hardware acceleration
        className: 'spinner', // The CSS class to assign to the spinner
        zIndex: 2e9, // The z-index (defaults to 2000000000)
        top: 'auto', // Top position relative to parent in px
        left: 'auto' // Left position relative to parent in px
    };

    $.fn.spin = function (opts, color, bgColor) {
        if (opts == "modal") opts = modal_opts;
        return this.each(function () {
            var $this = $(this),
              data = $this.data();

            if (data.spinner) {
                data.spinner.stop();
                delete data.spinner;
                if (opts == modal_opts) {
                    $("#spin_modal_overlay").remove();
                    return;
                }
            }
            if (opts !== false) {
                var spinElem = this;
                if (opts == modal_opts) {
                    var backgroundColor = 'background-color:' + (bgColor ? bgColor : 'rgba(0, 0, 0, 0.6)');
                    $('body').append('<div id="spin_modal_overlay" style=\"' + backgroundColor + ';width:100%; height:100%; position:fixed; top:0px; left:0px; z-index:' + (opts.zIndex - 1) + '"/>');
                    spinElem = $("#spin_modal_overlay")[0];
                }

                opts = $.extend({}, $.fn.spin.presets[opts] || opts, { color: color || $this.css('color') });
                data.spinner = new Spinner(opts).spin(spinElem);
            }
        })
    }

    $.fn.spin.presets = {
        tiny: { lines: 8, length: 2, width: 2, radius: 3 },
        small: { lines: 8, length: 4, width: 3, radius: 5 },
        large: { lines: 10, length: 8, width: 4, radius: 8 }
    }
}));