limit_text_area.php

<?php

function limit_text_area()
{
	echo
	"
	<script>
		jQuery(document).ready(function() {
			jQuery('#company_info').on('keyup', function() {
			var words = this.value.match(/\S+/g).length;
			if (words > 500) {
				// Split the string on first 500 words and rejoin on spaces
				var trimmed = jQuery(this).val().split(/\s+/, 500).join(' ');
				// Add a space at the end to keep new typing making new words
				jQuery(this).val(trimmed + ' ');
			}
			else {
					jQuery('#display_count').text(words);
					jQuery('#word_left').text(500-words);
			}
		});
	}); 
	</script>	  
	";
        
	
}

add_action('pmpro_checkout_before_submit_button', 'limit_text_area');