Implementation principle and script code of HTML discount calculation price-HTML Tutorial-php.cn

Implementation principle and script code of HTML discount calculation price

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Release： 2018-06-11 17:41:14

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The general principle is to set the calculation price event function, take different drop-down discount numbers, and send the calculation results into the text box. Interested friends can refer to the following

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 
<html> 
<meta http-equiv="content-type" content="text/html; charset=UTF-8"> 
<head> 
<title>打折后价格计算</title> 
<!-- 设置计算价格事件函数，取不同下拉打折数，计算结果送入文字框--> 
<script type="text/javascript"> 
function calculator(){ 
var prices=document.getElementById("price"); 
var discounts=document.getElementById("number"); 
var pay; 
var select=document.getElementById("payfunction"); 
if((prices.value>=0&&!isNaN(prices.value))&&(discounts.value>=0&&!isNaN(discounts.value))&&prices.value!=""&&discounts.value!="") 
{ 
pay=prices.value*discounts.value; 
switch(parseInt(select.value)){ 
case 1:pay=pay*0.5; break; 
case 2:pay=pay*0.8; break; 
case 3:pay=pay*0.6; break; 
} 
document.getElementById("result").value=pay; 
alert("恭喜你，交易成功！"); 
}else 
{ 
prices.focus(); 
prices.select(); 
alert("请输入正确的价格和数量(也不能为空)！"); 
} 
} 
</script> 
</head> 
<!-- 定义界面格式，设置下拉表，设置计算价格事件--> 
<body> 
<center> 
<form name="discount" action="result.jsp" method="post"> 
竞拍价格：<input type="text" id="price" style="width: 150px"/>
购买数量：<input type="text" id="number" style="width: 150px"/>
支付方式：<select id="payfunction" style="width: 150px"> 
<option value="1">网银支付-打5折</option> 
<option value="2">支付宝支付-打8折</option> 
<option value="3" selected="true">Q币支付-打6折</option> 
</select>
预计总价：<input type="text" id="result" style="width: 150px">
<input type="button" id="allresult" value="计算总价" onclick="calculator()" /> 
</form> 
</center> 
</body> 
</html>

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