[html] Binding select element to object in Angular

I'd like to bind a select element to a list of objects -- which is easy enough:

@Component({
   selector: 'myApp',
   template: `<h1>My Application</h1>
              <select [(ngModel)]="selectedValue">
                 <option *ngFor="#c of countries" value="c.id">{{c.name}}</option>
              </select>`
})
export class AppComponent{
    countries = [
       {id: 1, name: "United States"},
       {id: 2, name: "Australia"}
       {id: 3, name: "Canada"},
       {id: 4, name: "Brazil"},
       {id: 5, name: "England"}
     ];
    selectedValue = null;
}

In this case, it appears that selectedValue would be a number -- the id of the selected item.

However, I'd actually like to bind to the country object itself so that selectedValue is the object rather than just the id. I tried changing the value of the option like so:

<option *ngFor="#c of countries" value="c">{{c.name}}</option>

but this does not seem to work. It seems to place an object in my selectedValue -- but not the object that I'm expecting. You can see this in my Plunker example.

I also tried binding to the change event so that I could set the object myself based on the selected id; however, it appears that the change event fires before the bound ngModel is updated -- meaning I don't have access to the newly selected value at that point.

Is there a clean way to bind a select element to an object with Angular 2?

For me its working like this, you can console event.target.value.

<select (change) = "ChangeValue($event)" (ngModel)="opt">   
    <option *ngFor=" let opt of titleArr" [value]="opt"></option>
</select>

<select name="typeFather"
    [(ngModel)]="type.typeFather">
        <option *ngFor="let type of types" [ngValue]="type">{{type.title}}</option>
</select>

that approach always gonna work, however If you have a dynamic list, make sure you load it before the model

You can get selected value also with help of click() by passing the selected value through the function

<md-select placeholder="Select Categorie"  
    name="Select Categorie" >
  <md-option *ngFor="let list of categ" [value]="list.value" (click)="sub_cat(list.category_id)" >
    {{ list.category }}
  </md-option>
</md-select>

Also, if nothing else from given solutions doesn't work, check if you imported "FormsModule" inside of "AppModule", that was a key for me.

use this way also..

<h1>My Application</h1>
<select [(ngModel)]="selectedValue">
     <option *ngFor="let c of countries" value="{{c.id}}">{{c.name}}</option>
 </select>

Attention Angular 2+ users: for some reason, [value] does not work on elements. use [ngModel] instead.

<select [ngModel]="selectedCountry">
    <option *ngFor="let country of countries" [value]="country">{{country.name}}</option>
</select>

It worked for me:

Template HTML:

I added (ngModelChange)="selectChange($event)" to my select.

<div>
  <label for="myListOptions">My List Options</label>
  <select (ngModelChange)="selectChange($event)" [(ngModel)]=model.myListOptions.id >
    <option *ngFor="let oneOption of listOptions" [ngValue]="oneOption.id">{{oneOption.name}}</option>
  </select>
</div>

On component.ts:

  listOptions = [
    { id: 0, name: "Perfect" },
    { id: 1, name: "Low" },
    { id: 2, name: "Minor" },
    { id: 3, name: "High" },
  ];

An you need add to component.ts this function:

  selectChange( $event) {
    //In my case $event come with a id value
    this.model.myListOptions = this.listOptions[$event];
  }

Note: I try with [select]="oneOption.id==model.myListOptions.id" and not work.

============= Another ways can be: =========

Template HTML:

I added [compareWith]="compareByOptionId to my select.

<div>
  <label for="myListOptions">My List Options</label>
  <select [(ngModel)]=model.myListOptions [compareWith]="compareByOptionId">
    <option *ngFor="let oneOption of listOptions" [ngValue]="oneOption">{{oneOption.name}}</option>
  </select>
</div>

On component.ts:

  listOptions = [
    { id: 0, name: "Perfect" },
    { id: 1, name: "Low" },
    { id: 2, name: "Minor" },
    { id: 3, name: "High" },
  ];

An you need add to component.ts this function:

 /* Return true or false if it is the selected */
 compareByOptionId(idFist, idSecond) {
    return idFist && idSecond && idFist.id == idSecond.id;
 }

Just in case someone is looking to do the same using Reactive Forms:

<form [formGroup]="form">
  <select formControlName="country">
    <option *ngFor="let country of countries" [ngValue]="country">{{country.name}}</option>
  </select>
  <p>Selected Country: {{country?.name}}</p>
</form>

Check the working example here

Tested on Angular 11. I need an extra object 'typeSelected'. Pay attention I'm not using [(ngValue)] as other answers do :

HTML

<mat-select formControlName="type" [(value)]="typeSelected" [compareWith]="typeComparation">
     <mat-option *ngFor="let myType of allSurveysTypes" [value]="myType">
          {{myType.title}}
     </mat-option>
</mat-select>

CODE

// declaration
typeSelected: SurveyType;
...

// assigning variable 'type' of object 'survey' to 'typeSelected'
this.typeSelected = survey?.type;
...


// function to compare SurveyType objects
typeComparation = ( option, value ) =>  {
    if (option && value) {
        return option.id === value.id;
    }
}

Create another getter for selected item

<form [formGroup]="countryForm">
  <select formControlName="country">
    <option *ngFor="let c of countries" [value]="c.id">{{c.name}}</option>
  </select>

  <p>Selected Country: {{selectedCountry?.name}}</p>
</form>

In ts :

get selectedCountry(){
  let countryId = this.countryForm.controls.country.value;
  let selected = this.countries.find(c=> c.id == countryId);
  return selected;
}

In app.component.html:

 <select type="number" [(ngModel)]="selectedLevel">
          <option *ngFor="let level of levels" [ngValue]="level">{{level.name}}</option>
        </select>

And app.component.ts:

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

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  levelNum:number;
  levels:Array<Object> = [
      {num: 0, name: "AA"},
      {num: 1, name: "BB"}
  ];

  toNumber(){
    this.levelNum = +this.levelNum;
    console.log(this.levelNum);
  }

  selectedLevel = this.levels[0];

  selectedLevelCustomCompare = {num: 1, name: "BB"}

  compareFn(a, b) {
    console.log(a, b, a && b && a.num == b.num);
    return a && b && a.num == b.num;
  }
}

This code is very simple:

<select class="form-control" id="marasemaat" style="margin-top: 10%;font-size: 13px;" [(ngModel)]="fullNamePresentor" [formControl]="stateControl"  
            (change)="onSelect($event.target.value)">
            <option *ngFor="let char of programInfo1;let i = index;"   onclick="currentSlide(9,false)" value={{char.id}}>{{char.title + " "}}  ----> {{char.name + " "+ char.family }} ---- > {{(char.time.split('T', 2)[1]).split(':',2)}}</option>
  
          </select>

You can do this too without the need to use [(ngModel)] in your <select> tag

Declare a variable in your ts file

toStr = JSON.stringify;

and in you template do this

 <option *ngFor="let v of values;" [value]="toStr(v)">
      {{v}}
 </option>

and then use

let value=JSON.parse(event.target.value)

to parse the string back into a valid JavaScript object

This could help:

    <select [(ngModel)]="selectedValue">
          <option *ngFor="#c of countries" [value]="c.id">{{c.name}}</option>
    </select>

You Can Select the Id using a Function

<option *ngFor="#c of countries" (change)="onchange(c.id)">{{c.name}}</option>