/**
 * 
 */
 document.addEventListener('DOMContentLoaded', () => {

	//オブジェクトの定義
	var num1 = document.form1.num1;
	var sum1 = document.form1.sum1;
	var num2 = document.form1.num2;
	var sum2 = document.form1.sum2;
	var num3 = document.form1.num3;
	var sum3 = document.form1.sum3;
	
	var hontai = document.form1.hontai;
	var tax = document.form1.tax;
	var otodoke = document.form1.otodoke;
	var haisou = document.form1.haisou;
	
	var total = document.form1.total;
	
		
	num1.addEventListener("change", keisan);
	num2.addEventListener("change", keisan);
	num3.addEventListener("change", keisan);
	otodoke.addEventListener("change", keisan);
	
	function keisan(){
		let	nSum1 = 0;	//商品１	2800
		let	nSum2 = 0;	//商品２	1800
		let	nSum3 = 0;	//商品３	980
		let	nHontai = 0;
		let	nTax = 0;
		let	nHaisou = 0;
		let	nTotal = 0;
		
		//商品単価
		nSum1 = 2800 * num1.selectedIndex;
		nSum2 = 1800 * num2.selectedIndex;
		nSum3 = 980 * num3.selectedIndex;
		
		//本体価格
		nHontai = nSum1 + nSum2 + nSum3;
		
		//税額
		nTax = Math.trunc(nHontai * 0.05);
		
		//配送料金
		nHaisou = parseInt(otodoke.value);
		
		//総合計
		nTotal = nHontai + nTax + nHaisou
		
		//表示設定
		sum1.value = nSum1;
		sum2.value = nSum2;
		sum3.value = nSum3;
		
		hontai.value = nHontai;
		tax.value = nTax;
		haisou.value = nHaisou;
		total.value = nTotal;
		
	}
	

});