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How to use onBlur event on Angular2?

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How do you use Onblur event?

Definition and Usage The onblur event occurs when an object loses focus. The onblur event is most often used with form validation code (e.g. when the user leaves a form field). Tip: The onblur event is the opposite of the onfocus event. Tip: The onblur event is similar to the onfocusout event.

Can we use Onblur on Div?

The blur event fires when focus is lost. By default, a div element cannot have the focus in the first place so it can't be lost. If you set tabindex on a div, then it can gain the focus, but you should almost always be using a more appropriate element (such as a button) when you think about making interactive controls.

What is Onblur event in angular?

onBlur is a javascript event, fired when the input element lost its focus. You can see my previous about Angular button click event example Other versions available: React onBlur event guide example. Vue js Blur event example.

What is the difference between Blur and Focusout?

The main difference between this event and blur is that focusout bubbles while blur does not. The opposite of focusout is focusin .


Use (eventName) for while binding event to DOM, basically () is used for event binding. Also use ngModel to get two way binding for myModel variable.

Markup

<input type="text" [(ngModel)]="myModel" (blur)="onBlurMethod()">

Code

export class AppComponent { 
  myModel: any;
  constructor(){
    this.myModel = '123';
  }
  onBlurMethod(){
   alert(this.myModel) 
  }
}

Demo

Alternative(not preferable)

<input type="text" #input (blur)="onBlurMethod($event.target.value)">

Demo


For model driven form to fire validation on blur, you could pass updateOn parameter.

ctrl = new FormControl('', {
   updateOn: 'blur', //default will be change
   validators: [Validators.required]
}); 

Design Docs


You can also use (focusout) event:

Use (eventName) for while binding event to DOM, basically () is used for event binding. Also you can use ngModel to get two way binding for your model. With the help of ngModel you can manipulate model variable value inside your component.

Do this in HTML file

<input type="text" [(ngModel)]="model" (focusout)="someMethodWithFocusOutEvent($event)">

And in your (component) .ts file

export class AppComponent { 
 model: any;
 constructor(){ }

 /*
 * This method will get called once we remove the focus from the above input box
 */
 someMethodWithFocusOutEvent() {
   console.log('Your method called');
   // Do something here
 }
}

you can use directly (blur) event in input tag.

<div>
   <input [value]="" (blur)="result = $event.target.value" placeholder="Type Something">
   {{result}}
</div>

and you will get output in "result"


HTML

<input name="email" placeholder="Email"  (blur)="$event.target.value=removeSpaces($event.target.value)" value="">

TS

removeSpaces(string) {
 let splitStr = string.split(' ').join('');
  return splitStr;
}

/*for reich text editor */
  public options: Object = {
    charCounterCount: true,
    height: 300,
    inlineMode: false,
    toolbarFixed: false,
    fontFamilySelection: true,
    fontSizeSelection: true,
    paragraphFormatSelection: true,

    events: {
      'froalaEditor.blur': (e, editor) => { this.handleContentChange(editor.html.get()); }}

This is the proposed answer on the Github repo:

// example without validators
const c = new FormControl('', { updateOn: 'blur' });

// example with validators
const c= new FormControl('', {
   validators: Validators.required,
   updateOn: 'blur'
});

Github : feat(forms): add updateOn blur option to FormControls