Example to add the calculation needed to Gil's form

CF-gil-jQuery-calculation-example.php

add_action( 'wp_footer', function(){

	echo "<script>

			jQuery(document).ready(function() {
			  
			//CHANGE THE IDs TO MATCH YOUR FIELDS, these are frontend IDs, usually the field ID looking like fld_7683514 will be transformed as #fld_7683514_1
					
		        var textarea = '#fld_7683514_1'; //ID of the textarea we want to count words
				var hidden_value = '#fld_8293824_1'; //ID of the hidden field we want to print count in value parameter
				var text_field = '#fld_6154713_1';
				var hidden_value_over_500 = '#fld_2306970_1'; //ID of the hiiden field that get the values of words over 500
				var text_field_over_500 = '#fld_2296503_1';
				var amount_field = '#fld_6492248_1'; // ID of the hidden field that gets the price for extra word over 500
				var text_amount_over_500 = '#fld_4542284_1'; //ID of the field that prints the extra amount 
				var first_amount = '#fld_5704805_1-value'; // ID of the calculation hidden field to get the value of the calculation field
				var total_over_500 = '#fld_8933801_1'; //Prints the total to a hidden field to be used by the paypal processor
				var text_total_over_500 = '#fld_3176240_1'; //Prints the total to to a txt field for frontend user
				
				jQuery(textarea).keyup(function() { word_count( textarea, hidden_value, text_field ) });
				
				jQuery(textarea).keyup(function() { words_over_500( textarea, hidden_value_over_500, text_field_over_500 ) });
				
				jQuery(textarea).keyup(function() { amount_over_500( hidden_value_over_500, amount_field, text_amount_over_500  ) });
				
				jQuery(textarea).keyup(function() { amount_total( first_amount, amount_field, total_over_500, text_total_over_500  ) });
			
			});
					
			function word_count(field, count, text) {
			
			  var number = 0;
			  var matches = jQuery(field).val().match(/\b/g);
			  if(matches) {
			    number = matches.length/2;
			  }
			  jQuery(count).val( number );
			  jQuery(text).val( number );
			
			}
			
			function words_over_500(field, count, text) {
				var number = 0;
			    var matches = jQuery(field).val().match(/\b/g);
			  	if(matches) {
			    	number = matches.length/2;
			  	}
			  	number = number - 500;
			  	jQuery(count).val( number );
			  	jQuery(text).val( number );
			}
			
			function amount_over_500(field, count, text) {
				var number = 0;
				var dime = 0.10;
			  	var matches = jQuery(field).val();

			    if(matches) {
			    	number = matches * dime;
			    }
			    jQuery(count).val( number.toFixed(2) );
			    jQuery(text).val( number.toFixed(2) );
			
			}
			
			function amount_total(first_total, over, hidden, text) {
			    
				var first = jQuery(first_total).val();
				var plus = jQuery(over).val();
			
				var number = first;

				if(plus) {
					number = parseFloat(first) + parseFloat(plus);
				}

				jQuery(hidden).val( number.toFixed(2) );
				jQuery(text).val( number.toFixed(2) );
			    
		    }
			
	  </script>";

}, 10 );