Limit WordPress Comments to 1000 Characters

limit.js

// limit the comments to 1.000 characters
jQuery(function($) {
	// configure
	var comment_input = $( '#commentform textarea#comment' );
	var submit_button = $( '#commentform #submit' );
	var comment_limit_chars = 1000;
	// stop editing here
	
	// display how many characters are left
	$( '<div class="comment_limit_info"><span>' + comment_limit_chars + '</span></div>' ).insertAfter( comment_input );
	
	comment_input.bind( 'keyup', function() {
		// calculate characters left
		var comment_length = $(this).val().length;
		var chars_left = comment_limit_chars - comment_length;
		
		// display characters left
		$( '.comment_limit_info span' ).html( chars_left );
		
		// disable submit button if too many chars were used and add css class "commentInputError" to the characters left ouput "comment_limit_info"
	if( chars_left < 0 )
		{
		submit_button.attr('disabled', 'disabled');
		$( '.comment_limit_info' ).addClass('commentInputError');
		}
	else
		{
		submit_button.removeAttr('disabled');
		$( '.comment_limit_info' ).removeClass('commentInputError');
		}
	});
});