Capture text pasted into a textarea with JQuery

$('#txtcomplaint').bind('paste', function(e){ alert('pasting!') });

For additional resource take a look here.

You can do something like this

$("#txtcomplaint").bind('paste', function(e) {
    var elem = $(this);

    setTimeout(function() {
        // gets the copied text after a specified time (100 milliseconds)
        var text = elem.val(); 
    }, 100);
});