Adding options to select with javascript

Question

I want this javascript to create options from 12 to 100 in a select with id=\"mainSelect\", because I do not want to create all of the option tags manually. Can you give me

Answer 1

The most concise and intuitive way would be:

var selectElement = document.getElementById('ageselect');

for (var age = 12; age <= 100; age++) {
  selectElement.add(new Option(age));
}

Your age: Please select

You can also differentiate the name and the value or add items at the start of the list with additional parameters to the used functions:
HTMLSelect​Element​.add(item[, before]);
new Option(text, value, defaultSelected, selected);