converter

$(document).ready(function(e) {
	var form = $('#form-converter');
	
	if(form) {
		form.on('submit', function(e) {
			var result = '-';
			
			var h = form.find('[data-role="height"]').val();
			var w = form.find('[data-role="width"]').val();
			var l  = form.find('[data-role="length"]').val();
			var a  = form.find('[data-role="amount"]').val();
			
			var uf = form.find('[data-role="units-from"]').val();
			var ut = form.find('[data-role="units-to"]').val();
			
			var rb = form.find('[data-role="result"]');
			
			// u = шт, c = m3, s = m2, m = пог.м
			if((uf == 'u')&&(ut == 'u')) result = a;
			if((uf == 's')&&(ut == 'u')) result = 1000000 * a / (w * l);
			if((uf == 'c')&&(ut == 'u')) result = 1000000000 * a / (h * w * l);
			if((uf == 'm')&&(ut == 'u')) result = 1000 * a / l;
			
			if((uf == 'u')&&(ut == 's')) result = w * l * a / 1000000;
			if((uf == 's')&&(ut == 's')) result = a;
			if((uf == 'c')&&(ut == 's')) result = 1000 * a / h;
			if((uf == 'm')&&(ut == 's')) result = a * w / 1000;
			
			if((uf == 'u')&&(ut == 'c')) result = h * w * l * a / 1000000000;
			if((uf == 's')&&(ut == 'c')) result = h * a / 1000;
			if((uf == 'c')&&(ut == 'c')) result = a;
			if((uf == 'm')&&(ut == 'c')) result = h * w * a / 1000000;
			
			if((uf == 'u')&&(ut == 'm')) result = l * a / 1000;
			if((uf == 's')&&(ut == 'm')) result = 1000 * a / w;
			if((uf == 'c')&&(ut == 'm')) result = 1000000 * a / (h * w );
			if((uf == 'm')&&(ut == 'm')) result = a;
			
			rb.html(String(parseFloat(result.toFixed(6))) + ' ' + form.find('[data-role="units-to"] > option').filter(':selected').text());
			
			e.preventDefault();
		});
	}
});