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Old value of the event in ngModelChange when ngModel has the default value set


Old value of the event in ngModelChange when ngModel has the default value set

By : Handoko Widya Kusuma
Date : September 14 2020, 01:00 AM
To fix this issue Unfortunately this is currently not possible.
I had a similar problem here: Mat select - Get old value of selectionChange
code :

export class YOU_COMPONENT{

  private data: Subject<any> = new Subject<any>();

  checkTitle(value){
    this.data.next(value);
  }

  observeDataChange():Observable<[]>{
     // this return an observable of an array that contains [previous, current] data
     return this.data.asObservable().pipe(pairwise());
  }

}





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ngModel changes, ngModelChange is not called

ngModel changes, ngModelChange is not called


By : Patricia Lima
Date : March 29 2020, 07:55 AM
seems to work fine
code :
//This is a **two way** binding, so below code will not take effect
[(ngModel)]="trait.userMinimum"  
(ngModelChange)="setThresholds()" //This will not be fired
[(ngModel)]="trait.userMinimum" ---> [ngModel]="trait.userMinimum"
Pipe, ngModel and ngModelChange

Pipe, ngModel and ngModelChange


By : Adam Yu
Date : March 29 2020, 07:55 AM
around this issue This is because you have character $ at the front of val which added by your custom pipe. remove it before calling parseInt(data) will solve your problem.
code :
transform(val:any) {
  val = val.toString().replace(/[^0-9.]/g, '');
  if (val === '') return '';
  var value = parseInt(val);
  var num = '$' + value.toFixed(2).replace(/(\d)(?=(\d\d\d)+(?!\d))/g, "$1,");
  return num;
} 
Error: Support for using the ngModel input property and ngModelChange event with reactive form directives has been depre

Error: Support for using the ngModel input property and ngModelChange event with reactive form directives has been depre


By : user3218623
Date : March 29 2020, 07:55 AM
With these it helps I 'm not a big fan of using reactive form with template form , so if you want a reference to the formControl value you can use form object this.form.get('control Name').value,but this can be simplified by creating getter and setter property ,check the example
code :
  constructor(fb:FormBuilder) { 
    this.form = fb.group({ //   setup the form 
      userName:''
    })
  }

  set value (val) { 
    this.form.get('userName').setValue(val);
  }
  get value () {
    return this.form.get('userName').value
  }

  updateUserName(){
    this.value = 'updated!!!! '
  }
using (ngModelChange) without corresponding [ngModel]

using (ngModelChange) without corresponding [ngModel]


By : Kaszpiro
Date : March 29 2020, 07:55 AM
help you fix your problem [ngModel] is required to use (ngModelChange) because it is the @Output of ngModel directive.
How [ngModel] and (ngModelChange) work together?

How [ngModel] and (ngModelChange) work together?


By : FWaweru
Date : October 02 2020, 08:00 PM
Hope that helps
The [()] syntax is easy to demonstrate when the element has a settable property called x and a corresponding event named xChange. Here's a SizerComponent that fits this pattern. It has a size value property and a companion sizeChange event
code :
<input [(ngModel)]="name"/>
<input [ngModel]="name" (ngModelChange) ="name = $event"/>
<input (ngModelChange) ="name = $event"/>
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