How to use $v,$s,$v2,apex.item to work with form in Oracle Apex

When we are doing a project with Oracle Apex, we often use javascript in Dynamic Action. Oracle Apex supports many functions such as $v,$s,$v2,apex_item to work with items in the form.
This video I am going to talk about how to use these functions. When you are developing with oracle apex I suggest you use these functions instead of custom javascript whenever possible because these functions syntax are simple and make your application maintainable.
$v retrieve item value in the form
$s set the value to the item in the form.
$v2 retrieve multiple select items value like check boxes, group radios, select lists.
apex_item has many more functions,you can reference in oracle apex document.
If you want to dig into more functions,please reference Oracle Apex Official documents. Please connect the link:
docs.oracle.co...