title: how to add onchange event on dropdown in angular ?
body: <p>could you please tell me how to add onchange event on dropdown  in angular ? I made a simple demo in which initially I fetch <code>bank names</code> and show in <code>drop down</code> . Now I want to add <code>on change event</code> on that dropdown .In other words I want to which <code>bank</code> user select . Using that  <code>bank</code> name I want to get <code>state names</code></p>
  
  <p>here is my code
  <a href="https://stackblitz.com/edit/angular-batt5c" rel="noreferrer">https://stackblitz.com/edit/angular-batt5c</a></p>
  
  <pre><code>&lt;select class='select-option' 
          (ngModelChange)='onOptionsSelected($event)'&gt;
      &lt;option class='option' 
      *ngFor='let option of dropDownData' 
      [value]="option.seo_val"&gt;{{option.text_val}}&lt;/option&gt;
  &lt;/select&gt;
  
  onOptionsSelected(){
    console.log('===');
    // send selected value
    this.seletedValue.emit('');
  }
  </code></pre>