How to remove/hide select options from select-list

Answer 1

To save your time, please read the following answer.

OK, I searched for a few hours and I noticed that there is NO WORKING WAY to "hide" (what I mean is make the option temporally disappeared from the drop-down list) for all browsers, such as set the visibility to be hidden or style="display: none".

My final approach is: 1. Create an array to store all the options for the dropdown list. 2. Use a method to dynamically update the drop-down list according what you want to be shown.

That's it, if you want to use a drop down list without using any library