Answers for "onchange in html"

js html textbox on change

<!-- 
	You can use any of the following:
	onkeydown, onkeyup or onchange
 -->

<input type="text" onkeydown="keydownFunction()" 
onkeyup="keyupFunction()" onchange="changeFunction()">

onchange event

<select class='select-option' [(ngModel)]="selected"
     (change)='onOptionsSelected($event)'>
   <option class='option'  *ngFor='let option of dropDownData' 
   [value]="option.seo_val">{{option.text_val}}</option>
</select>

public onOptionsSelected(event) {
   const value = event.target.value;
   this.selected = value;
   console.log(value);
}