check empty in jquery code example

Example 1: check fro text input jquery

$('#apply-form input').blur(function()
{
    if( !$(this).val() ) {
          $(this).parents('p').addClass('warning');
    }
});

Example 2: jquery empty

// Remove all child nodes of the set of matched elements from the DOM
// This method does not accept any arguments.
$("div.parent").empty();