Dropdown menus are a crucial part of many web forms, providing users with predefined options to choose from. However, there are scenarios where users need to add new options or input custom values. This post outlines how to dynamically add options to a dropdown list using a text box and show or hide the text box when "Other" is selected. Dynamic Dropdown Option Addition Using JavaScript and Ajax, you can create a seamless experience for users to add new options dynamically. Below is the implementation: JavaScript Code for Dynamic Option Addition $ ( document ). on ( 'click' , '.btcl' , function () {     var dataString = 'Rule=comp_list' ;     $ . ajax ({         type : "POST" ,         url : "ajax.php" ,         data : dataString ,         cache : false ,         success : function ( data ) {             $ ( "#company_list" ). html ( dat...