Angular2: how bind to select multiple

Question

I\'m able to bind using ngModel for a single select but I would like to bind an array to the multiple selected options. When I attempt this I get the error

Answer 1

You could implement your own like in my plnkr. UPDATED because CHOW wanted the example without jquery.

http://plnkr.co/edit/Pf92XATg3PT5RtBvrsaA?p=preview

//our root app component
import {Component} from 'angular2/core'

@Component({
  selector: 'my-app',
  providers: [],
  styles:['.options{cursor:pointer;padding:10px;border-bottom:1px solid black;}', '.multiple-select{overflow-y:scroll; height:100px;}'],
  template: `
      
{{selected|json}}
      

        
{{athlete.name}}
      
  `,
  directives: []
})
export class App {
  public athletes:any[]=[];
  public selected:any[]=[];
  constructor() {
    for(var i = 1; i <= 5; i++){
      this.athletes.push({
        value:i,
        name:("athlete-"+i),
        id:("id-"+i)
      })
    }
  } 
  toggleMultiSelect(event, val){
    event.preventDefault();
    if(this.selected.indexOf(val) == -1){
      this.selected = [...this.selected, val];
      var elem = document.getElementById(val.id);
      elem.className += " fa fa-check";
    }else{
      var elem = document.getElementById(val.id);
      elem.className = elem.className.split(' ').splice(0, elem.className.split(' ').length - 2).join(' ');
      this.selected = this.selected.filter(function(elem){
        return elem != val;
      })
    }
  }
}