How do I programmatically set the value of a select box element using JavaScript?

Question

You can use this function:

function selectElement(id, valueToSelect) {    
    let element = document.getElementById(id);
    element.value = valueToSelect;
}

selectElement('leaveCode', '11');

<select id="leaveCode" name="leaveCode">
  <option value="10">Annual Leave</option>
  <option value="11">Medical Leave</option>
  <option value="14">Long Service</option>
  <option value="17">Leave Without Pay</option>
</select>

Optionally if you want to trigger onchange event also, you can use :

element.dispatchEvent(new Event('change'))

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