select option trigger in js
/*html*/
<select id="sel" onchange='alert("changed")'>
<option value='1'>One</option>
<option value='2'>Two</option>
<option value='3' selected>Three</option>
</select>
/*Function js*/
var select = document.querySelector('#sel'),
input = document.querySelector('input[type="button"]');
select.addEventListener('change',function(){
alert('Yare yare daze');
});
/*RESULT*/
/*When change value trigger alert('Yare yare daze') */
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