import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  template: `<h1>Hello {{name}}</h1>
  <p-typeahead>
    <select style="width: 200px;">
      <option value=""></option>
      <option value="1">One</option>
      <option value="2">Two</option>
      <option value="3">Three</option>
      <option value="4">Four</option>
      <option value="5" selected>Five</option>
    </select>
  </p-typeahead>
  <hr>
  ngModel support:
  <p-typeahead [(ngModel)]="address">
    <select style="width: 200px;">
      <option value=""></option>
      <option value="btl">btl - Bantul</option>
      <option value="kp">kp - Kulon Progo</option>
      <option value="slm">slm - Sleman</option>
      <option value="gk">gk - Gunung Kidul</option>
      <option value="kt">kt - Kota</option>
    </select>
  </p-typeahead>
  address: {{address}}
  `
})
export class AppComponent { 
  address='kp';
  
}
import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { AppComponent }  from './app.component';
import { CmpTypeahead }  from './CmpTypeahead';
import { FormsModule }   from '@angular/forms';

@NgModule({
  imports:      [ BrowserModule, FormsModule ],
  declarations: [ AppComponent, CmpTypeahead ],
  bootstrap:    [ AppComponent ]
})
export class AppModule { }

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

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

platformBrowserDynamic().bootstrapModule(AppModule);

<!DOCTYPE html>
<html>
  <head>
    <title>Angular Quickstart</title>
    <script>document.write('<base href="' + document.location + '" />');</script>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <style>
      body {color:#369;font-family: Arial,Helvetica,sans-serif;}
    </style>

    <!-- Polyfills -->
    <script src="https://unpkg.com/core-js/client/shim.min.js"></script>

    <script src="https://unpkg.com/zone.js@0.7.4?main=browser"></script>
    <script src="https://unpkg.com/systemjs@0.19.39/dist/system.src.js"></script>
    <script src="systemjs.config.js"></script>
    <script>
      System.import('main.js').catch(function(err){ console.error(err); });
    </script>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
    <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.min.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js"></script>
  </head>

  <body>
    <my-app>Loading AppComponent content here ...</my-app>
  </body>

</html>
/**
 * WEB ANGULAR VERSION
 * (based on systemjs.config.js in angular.io)
 * System configuration for Angular samples
 * Adjust as necessary for your application needs.
 */
(function (global) {
  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',

      // angular bundles
      '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
      '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
      '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
      '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
      '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
      '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
      '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
      '@angular/router/upgrade': 'npm:@angular/router/bundles/router-upgrade.umd.js',
      '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
      '@angular/upgrade': 'npm:@angular/upgrade/bundles/upgrade.umd.js',
      '@angular/upgrade/static': 'npm:@angular/upgrade/bundles/upgrade-static.umd.js',

      // other libraries
      'rxjs':                      'npm:rxjs@5.0.1',
      'angular-in-memory-web-api': 'npm:angular-in-memory-web-api/bundles/in-memory-web-api.umd.js',
      'ts':                        'npm:plugin-typescript@5.2.7/lib/plugin.js',
      'typescript':                'npm:typescript@2.0.10/lib/typescript.js',

    },
    // packages tells the System loader how to load when no filename and/or no extension
    packages: {
      app: {
        main: './main.ts',
        defaultExtension: 'ts'
      },
      rxjs: {
        defaultExtension: 'js'
      }
    }
  });

})(this);


import {Component, Input, AfterViewInit, OnChanges, SimpleChange, forwardRef, ViewChild, ElementRef} from '@angular/core';
import {NG_VALUE_ACCESSOR, ControlValueAccessor} from '@angular/forms';

export const TYPEAHEAD_VALUE_ACCESSOR: any = {
	provide: NG_VALUE_ACCESSOR,
	useExisting: forwardRef(() => CmpTypeahead),
	multi: true
};

declare var jQuery: any;

@Component({
	moduleId: module.id,
	selector: 'p-typeahead',
	template: `<ng-content></ng-content>`,
	providers: [TYPEAHEAD_VALUE_ACCESSOR],
	styleUrls: ['typeahead.css']
})

export class CmpTypeahead implements AfterViewInit, ControlValueAccessor {
	private objRef: any;
	@Input() items: any;
	value: string;
	onModelChange: Function = () => {};
	onModelTouched: Function = () => {};
	@Input() disabled: any;
	@Input() placeholder = '';
	@Input() allowClear = true;
	selectElm: any;
	initItemsCount = 0;
	
	constructor(private elRef: ElementRef) {
	}

	ngAfterViewInit() {
	  this.selectElm = this.elRef.nativeElement.getElementsByTagName('select')[0];
		this.initItemsCount = this.selectElm.options.length;
		this.objRef = jQuery(this.selectElm);
		this.objRef.select2({
			placeholder: this.placeholder,
			allowClear: this.allowClear
		});

		this.objRef.on("select2:select", (e) => {
			this.value = this.objRef.val();
			this.onModelChange(this.value);
			this.selectElm.focus();
		});
		
		this.objRef.on("select2:unselect", (e) => {
			this.value = null;
			this.onModelChange(this.value);
			this.selectElm.focus();
		});
		
	}

	writeValue(value: any): void {
		if (value === undefined) {
			value = null;
		}
		this.value = value;
		if (this.objRef) {
			this.objRef.val(value).trigger("change");
		}
	}
	
	ngAfterViewChecked() {
		if (this.selectElm && this.selectElm.options.length != this.initItemsCount) {
			/**
			 * trigger change in writeValue() doesn't work if the items (the option tags) in 
			 * <select> haven't been rendered. This trigger is to fix this problem
			 */
			this.initItemsCount = this.selectElm.options.length;
			this.objRef.val(this.value).trigger("change");
		}
	}

	registerOnChange(fn: Function): void {
		this.onModelChange = fn;
	}

	registerOnTouched(fn: Function): void {
		this.onModelTouched = fn;
	}

	setDisabledState(val: boolean): void {
		this.disabled = val;
		this.objRef.prop("disabled", val);
	}

}
:host {
	display: block;
	border-radius: 4px;
	/*padding-left: -5px;*/
}

:host[required] /deep/ .select2-selection--single {
	border-radius: 0 4px 4px 0;
}