xxxxxxxxxx1
<select class="select">2
<optgroup label="Label 1">3
<option value="1">One</option>4
<option value="2">Two</option>5
<option value="3">Three</option>6
</optgroup>7
<optgroup label="Label 2">8
<option value="4">Four</option>9
<option value="5">Five</option>10
<option value="6">Six</option>11
</optgroup>12
</select>1
1
xxxxxxxxxx1
const select = document.querySelector('.select');2
const selectInstance = mdb.Select.getInstance(select);3
4
selectInstance.setValue('4');5
6
Console errors: 0