To show all the options from a dropdown list, use the options property. The property allows you to get all the options with length property.
Example
You can try to run the following code to get all the options from a drop-down list.
<!DOCTYPE html>
<html>
<body>
<form id="myForm">
<select id="selectNow">
<option>One</option>
<option>Two</option>
<option>Three</option>
</select>
<input type="button" onclick="display()" value="Click">
</form>
<p>Click the button to get all the options</p>
<script>
function display() {
var a, i, options;
a = document.getElementById("selectNow");
options = "";
for (i = 0; i < a.length; i++) {
options = options + "<br> " + a.options[i].text;
}
document.write("DropDown Options: "+options);
}
</script>
</body>
</html>