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HTML 

              
                <html lang="ja" dir="ltr">
<head>
<meta charset="utf-8">
<title>フォーム計算のデモ</title>
<style>
	p {
		margin: 0;
	}
	.form-box {
		margin-bottom: 1em;
	}
#item_price_total, #postage_price,#total_price {
	display: inline-block;
	width: auto;
	padding: 0;
	background: none;
	border: none;
	font-size: inherit;
	cursor: default;
	vertical-align: baseline;
	-webkit-appearance: inherit;
}
</style>
</head>
<body>
<div id="wrapper">
	<section id="contents">
		<h1 class="">フォーム自動計算</h1>
			<div class="">
			<form class="form-horizon" method="post" action="">
				<p>ご希望項目の数を選択してください。</p>

				<div class="form-box">
					<p class="buy_itemu_menu" data-price="300">花束
						<span class="kakaku">(定価 300円／会員価格 200円)</span>
					</p>
					<select name="花束数量">
						<option data-num="0" value="0個" selected>0個</option>
						<option data-num="1" value="1個">1個</option>
						<option data-num="2" value="2個">2個</option>
						<option data-num="3" value="3個">3個</option>
					</select>
				</div>

				<div class="form-box">
					<p class="buy_itemu_menu" data-price="700">防災セット
						<span class="kakaku">(定価 700円／会員価格 500円)</span>
					</p>
					<select name="防災セット数量">
						<option data-num="0" value="0個" selected>0個</option>
						<option data-num="1" value="1個">1個</option>
						<option data-num="2" value="2個">2個</option>
						<option data-num="3" value="3個">3個</option>
					</select>
				</div>
				<div class="form-box">
					<p class="buy_itemu_menu" data-price="2500">人力飛行機
						<span class="kakaku">(定価 2,500円／会員価格 2,300円)</span>
					</p>
					<select name="人力飛行機数量">
						<option data-num="0" value="0個" selected>0個</option>
						<option data-num="1" value="1個">1個</option>
						<option data-num="2" value="2個">2個</option>
						<option data-num="3" value="3個">3個</option>
					</select>
				</div>


				<hr>


				<div class="form-box">
					<label class="form-label">小計：</label>
					<input id="item_price_total" class="" name="小計" value="0円" readonly>
				</div>

				<div class="form-box">
					<label class="form-label">送料：</label>
					<input id="postage_price" class="" name="送料" value="300円" readonly>
					<span>※1発送につき300円（3,000円以上のご購入で送料無料）</span>
				</div>

				<div class="form-box">
					<label class="form-label">合計金額：</label>
					<input id="total_price" class="" name="合計金額" value="300円" style="font-size: 150%; font-weight: bold; display: inline-block;" readonly>
					<div>
						<label class="checkbox">
						<input id="kaiinnkakaku" type="checkbox" name="会員価格" value="チェック有">
							会員の方はチェックしてください。会員価格に変更されます。
						</label>
					</div>

				</div>


				<div class="submit-form">
					<button id="form-check" type="submit" class="btn">送 信（されません）</button>
				</div>
			</form>
		</div><!-- section -->
	</section><!-- /entry-content -->
</div><!-- /#wrapper -->


<footer id="footer">
	<small class="copyright">&copy;できコツ</small>
</footer>

</body>
</html>
!

CSS
!

JS 

              
                $(function() {

$("select,#kaiinnkakaku").change(function() {

	var hairetu = [];
	for(var i = 0; i < $(".buy_itemu_menu").length; i++){

		var item_price = $(".buy_itemu_menu").eq(i).data("price");
		var item_select = $(".buy_itemu_menu").eq(i).next("select").find("option:selected").data("num");

		if(document.getElementById("kaiinnkakaku").checked == true){

			//価格別に設定したい場合
			if ( item_price > 500) {
				var item_price = item_price - 200
			} else {
				var item_price = item_price - 100
			}
			//割合で設定したい場合
//				var item_price = item_price*.8
		}

		if( item_select > 0 ) {
			hairetu.push(item_price * item_select);
		} else {
			0;
		}
	}

	var total = 0;
	for(var j = 0; j < hairetu.length; j++){
		total += hairetu[j];
	}

	if(total >= 3000) {
		var postage = 0;
	} else {
		var postage = 300;
	}


	$("#item_price_total").val(total + "円");
	$("#postage_price").val(postage + "円");
	$("#total_price").val((total + postage) + "円");

});

});
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