Add onchange event on a select filter: How to ?

I included this code in a custom module and it seems to work.

function custom_form_alter(&$form, &$form_state, $form_id) {

if ($form_id == 'views_exposed_form' && $form['#id'] == 'views-exposed-form-test1-page') {
   
$form['tid']['#attributes'] =  array('onchange' => "myfunction();");

}
}

It seems to work.

Now, the problem is javascript. I included the script in my theme.info.
Then, i used this code:

function myfunction(){
       if ($("#tid option[value='2']").attr('selected'))
       
       {
          document.getElementById('something').style.display = "none";
       }
    } 

The result is bad, the code doesn't work.

I have attached screenshot. Can anyone let me know how to do ?

Thank you