ngModel for textarea not working in angular 2

For binding textarea values in Angular 2 you can use the change-function:

Template

<textarea id="some-value" (change)="doTextareaValueChange($event)">{{textareaValue}}</textarea>

Component

export class AppComponent implements OnInit {
  private textareaValue = '';
  doTextareaValueChange(ev) {
    try {
      this.textareaValue = ev.target.value;
    } catch(e) {
      console.info('could not set textarea-value');
    }
  }
}

Unless you really want to have sync in between, you would normally implement a button to save/apply the change when it's finished json editing. If that is the case, your render is easy.

<textarea #textbox>{{ rapidPage | json }}</textarea>

Make sure no other space or return character in between the above line.

Then an traditional button, ex.

<a (click)="updateRapidPage(textbox.value)">Apply</a>

I found this is better in some case than brutal [(rapidPage)].

You can also use @ViewChild('textbox') input inside the component to access this variable.

<textarea class="form-control" 
          name="message"
          rows="8"
          [(ngModel)]="Obj.message"
          #message='ngModel'
          ></textarea>

for Two way binding You just need to add attribute in textarea tag name="message", ONLY [(ngModel)] works 100%!.

Assuming that you want to bind rapidPage as it is and will only write valid JSON in the textArea.

• You need to PARSE it when changing the value, and STRINGIFY when showing in textarea.

---

StackBlitz DEMO

Do the following in your Component code

  rapidPage = {"pageRows":[{"sections":[{"sectionRows":[{"secRowColumns":[]},{"secRowColumns":[{"colName":"users"}]},{"secRowColumns":[{"colName":"sample"}]}],"width":0}]}],"pageName":"DefaultPage","pageLayout":"DEFAULT_LAYOUT","editMode":true}; 
  // your object

  get rapidPageValue () {
    return JSON.stringify(this.rapidPage, null, 2);
  }

  set rapidPageValue (v) {
    try{
    this.rapidPage = JSON.parse(v);}
    catch(e) {
      console.log('error occored while you were typing the JSON');
    };
  }

Template Usage:

<textarea [(ngModel)]='rapidPageValue' rows="30" cols="120">                             
</textarea>