Demo of Selectable start event using JQuery

Item 1
Item 2
Item 3
Item 4
Item 5

Press and hold Ctrl key for multiple selection

JQuery

$(document).ready(function() {
//////////////////////////
$( '#my_selectable' ).selectable({
start: function( event, ui ) {
$('#d1_start').html('start : I am start');	
}
});
///
$( "#my_selectable" ).on( "selectablestart", function( event, ui ) {
$('#d1_event_listener').html('I am through event listener <i>selectablestart</i> ');
} );
///
})

HTML

<div class='col-md-4 bg-light'>
<ul id="my_selectable">
  <li id=i1>Item 1</li>
  <li id=i2>Item 2</li>
  <li id=i3>Item 3</li>
  <li id=i4>Item 4</li>
  <li id=i5>Item 5</li>
</ul>

<div id=d1_start></div><br>
<div id=d1_event_listener></div>