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<!DOCTYPE html>
<html>
<body>
<h3>A demonstration of how to access a DATALIST element</h3>
<form>
  <input list="myDatalist"> 
  <datalist id="myDatalist"> 
    <option value="Internet Explorer">
    <option value="Firefox">
    <option value="Chrome">
    <option value="Opera">
    <option value="Safari">
  </datalist>
</form>
<p>Click the button to get the number of option elements in the datalist.</p>
<button onclick="myFunction()">Try it</button>
<p><strong>Note:</strong> The input element's list attribute is used to bind it together with the datalist element.</p>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.getElementById("myDatalist").options.length;
  document.getElementById("demo").innerHTML = "Found " + x + " options in the list.";
}
</script>
</body>
</html>