// JavaScript Document
var bIsFirebugReady = (!!window.console && !!window.console.log);

$(document).ready(
	function (){
		// update the plug-in version
		$("#idPluginVersion").text($.Calculation.version);
		
		// bind the recalc function to the quantity fields
		$("input[name^=qty_item_]").bind("keyup", recalc);
		// run the calculation function now
		recalc();
	}
);

function recalc(){
	$("[id^=total_item]").calc(
		// the equation to use for the calculation
		"qty * price",
		// define the variables used in the equation, these can be a jQuery object
		{
			qty: $("input[name^=qty_item_]"),
			price: $("[id^=price_item_]")
		},
		// define the formatting callback, the results of the calculation are passed to this function
		function (s){
			// return the number as a dollar amount
			return s;
		},
		// define the finish callback, this runs after the calculation has been complete
		function ($this){
			// sum the total of the $("[id^=total_item]") selector
			var sum = $this.sum();
			
			$("#grandTotal").text(
				// round the results to 2 digits
				sum + " руб."
			);
		}
	);
}