javascript choose select option code example
Example 1: javascript get selected option
var e = document.getElementById("selectElementID");
var value=e.selectElement.options[e.selectedIndex].value;// get selected option value
var text=e.options[e.selectedIndex].text;//get the selected option text
Example 2: make select option selected javascript
document.getElementById('personlist').getElementsByTagName('option')[11].selected = 'selected'