JAVASCRIPT

jquery give control focus

$('.class').focus();
$('#name').focus();

on focus jquery

$('#id').focus(function(){
 // do your code here
});

jquery focus

$('#name').trigger('focus')

jquery on focus

$( "#target" ).focus(function() {
  alert( "Handler for .focus() called." );
});

input focus in jquery

$("#button").on("click", function () {
    $("#input").focus();
});