<select id="selectid" class="form-control-mb-12" (change)="modo($event.target.value)">
<option value="mod1">MODO 1</option>
<option value="mod2">MODO 2</option>
<option value="mod3">MODO 3</option>
</select>
modo(value: string){
switch(value) {
case "mod1":
// if modo 1 is selected do something.
break;
case "mod2":
// if modo 2 is selected do something.
break;
case "mod3":
// if modo 3 is selected do something.
break;
}
}