create datalist dynamically javascript code example

Example 1: create javascript array from datalist dynamically

var my_list=document.getElementById("months");
alert(my_list.options.length);

Example 2: javascript array from datalist

var options = document.getElementById('estados').getElementsByTagName('option');
var optionVals = [], i = 0;

for (i; i < options.length; i += 1) {
  optionVals.push(options[i].value);
}

console.log(optionVals);