In angular you can also use onchange event its easy to do. You can follow this code to do it.
<select formControlName="tableName" (change)='onSelectChange($event)'>
<option value="">Select</option>
<option value="India">India</option>
</select>
onSelectChange(event) {
const value = event.target.value;
console.log(value);
}
For more info or more way to do it you can follow this URL.