Get value from select option in Angular 4

Question

How to get value from selection option in Angular 4?

I want to assign it to a new variable in component.ts file. I tried this, but it doesn’t output anything.

Can you also do this using [(ngModel)]?

component.html

<form class="form-inline" (ngSubmit)="HelloCorp(f)" #f="ngForm">
     <div class="select">
         <select class="form-control col-lg-8" #corporation required>
             <option *ngFor="let corporation of corporations" [value]="corporationObj">{{corporation.corp_name}}</option>    
         </select>
             <button type="submit" class="btn btn-primary manage">Submit</button>
     </div>
</form>

component.ts

HelloCorp() {
const corporationObj = corporation.value;
}

Answer 1

Typically (see Stackblitz here: https://stackblitz.com/edit/angular-gh2rjx ):

HTML

<select [(ngModel)]="selectedOption">
   <option *ngFor="let o of options">
      {{o.name}}
   </option>
</select>
<button (click)="print()">Click me</button>

<p>Selected option: {{ selectedOption }}</p>
<p>Button output: {{ printedOption }}</p>

Typescript

export class AppComponent {
  selectedOption: string;
  printedOption: string;

  options = [
    { name: "option1", value: 1 },
    { name: "option2", value: 2 }
  ]
  print() {
    this.printedOption = this.selectedOption;
  }
}

---

In your specific case, you can use ngModel as follows:

<form class="form-inline" (ngSubmit)="HelloCorp()">
     <div class="select">
         <select [(ngModel)]="corporationObj" class="form-control col-lg-8" #corporation required>
             <option *ngFor="let corporation of corporations"></option>    
         </select>
         <button type="submit" class="btn btn-primary manage">Submit</button>
     </div>
</form>

HelloCorp() {
  console.log("My input: ", corporationObj);
}

Answer 2

export class MyComponent implements OnInit {

  items: any[] = [
    { id: 0, name: 'one' },
    { id: 1, name: 'two' },
    { id: 2, name: 'three' },
    { id: 3, name: 'four' },
    { id: 4, name: 'five' },
    { id: 5, name: 'six}' }
  ];
  selected: number = 0;

  constructor() {
  }
  
  ngOnInit() {
  }
  
  selectOption(id: number) {
    //getted from event
    console.log(id);
    //getted from binding
    console.log(this.number)
  }

}

<div>
  <select (change)="selectOption($event.target.value)"
  [(ngModel)]="selected">
  <option [value]="item.id" *ngFor="let item of items">{{item.name}}</option>
   </select>
</div> 

Run codeHide result

Answer 3

HTML-

    <form class="form-inline" (ngSubmit)="HelloCorp(modelName)">
        <div class="select">
            <select class="form-control col-lg-8" [(ngModel)]="modelName" required>
                <option *ngFor="let corporation of corporations" [ngValue]="corporation">
                    {{corporation.corp_name}}
                </option>    
            </select>
            <button type="submit" class="btn btn-primary manage">Submit</button>
        </div> 
    </form>

HelloCorp(corporation) {
    var corporationObj = corporation.value;
}

Answer 4

[(ngModel)] select:

<select class="form-control col-lg-8" #corporation required [(ngModel)]="selectedValue">

Answer 5

.

,

I. name = "selectedCorp" select

II. [value] = "corporationObj" [value] = "corporation", * ngFor = "let ":

 <form class="form-inline" (ngSubmit)="HelloCorp(f)" #f="ngForm">
   <div class="select">
     <select class="form-control col-lg-8" #corporation name="selectedCorp" required>
       <option *ngFor="let corporation of corporations" [value]="corporation">{{corporation.corp_name}}</option>
     </select>
     <button type="submit" class="btn btn-primary manage">Submit</button>
   </div>
 </form>

.ts :

HelloCorp(form: NgForm) {
   const corporationObj = form.value.selectedCorp;
}

const corporationObj , .

:

html- [value] = "corporation" ( * ngFor = "let ") [], name value.

"selectedCorp", , "form.value.selectedCorp" .ts.

, "#corporation" "select" .