how to find closest parent class in jquery code example

Example 1: jquery closest

$( "li.item-a" )
  .closest( "ul" )
  .css( "background-color", "red" );

Example 2: select parent of element jquery

$(this).parent(); // jquery

Example 3: jquery get closest form

$( this ).closest( "form" )

Example 4: jquery find parent closest by id child

$( "li.item-a" )
  .closest( "ul" )
  .css( "background-color", "red" );