Javascript 税收计算器输入框不起作用
[英]Javascript Tax Calculator Input boxes not Functioning
问题描述
this is a homework assignment in which I am supposed to write the JavaScript function (calculate) to calculate and display sales tax and total upon hitting the calculate button.
这是一个家庭作业，我应该在其中编写 JavaScript 函数（计算）以在点击计算按钮时计算和显示销售税和总计。
This was provided for me:这是为我提供的：
salesTax = subtotal * taxRate/100; salesTax = 小计 * taxRate/100；
total = subtotal + salesTax;总计 = 小计 + 销售税；
and和
Must be a positive number less than 10000000必须是小于 10000000 的正数
Must be a positive number less than 50必须是小于 50 的正数
Here is my code, can you tell me why it is not functioning?这是我的代码，你能告诉我为什么它不起作用吗？ I am a novice obviously:我显然是个新手：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Sales Tax Calculator</title>
<link rel="stylesheet" href="style.css" />
<script>
//function declaration for calculating sales tax
function calculate() {
//get three inputs from input boxes in the form
let subtotal = parseInt(document.getElementById("subtotal").value);
let taxRate = parseFloat(document.getElementById("tax_rate").value);
//validation data
if (subtotal <= 10000000 || tax_rate <= 50) {
alert("sales tax exceeds 10000000 and/ or tax rate exceeds 50");
} else {
//calculate sales tax
salesTax = subtotal * taxRate / 100;
total = subtotal + salesTax;
//display the results to the last two boxes
document.getElementById("sales_tax").value = salesTax;
document.getElementById("total").value = total;
}
}
//function calling part
//function named clear_form to clear every data entry in the clear_form
//create function
function clear_form() {
document.getElementById("subtotal").value = " ";
document.getElementById("tax_rate").value = " ";
document.getElementById("sales_tax").value = " ";
document.getElementById("total").value = " ";
/*document.getElementById("investment").focus();*/
}
//function calling part using window.onload
window.onload = function() {
document.getElementById("calculate").onclick = calculate
document.getElementById("clear").onclick = clear_form
}
</script>
</head>
<body>
<div id="content">
<h1>Sales Tax Calculator</h1>
<p>Enter Subtotal and Tax Rate and click "Calculate".</p>
<div id="taxCalc">
<label for="subtotal">Subtotal:</label>
<input type="text" id="subtotal">
<span id="subtotal_message">Enter Order Subtotal</span><br />
<label for="tax_rate">Tax Rate:</label>
<input type="text" id="tax_rate">
<span id="tax_rate_message">Enter Sales Tax Rate </span><br />
<label for="sales_tax">Sales Tax:</label>
<input type="text" id="sales_tax" disabled><br />
<label for="total">Total:</label>
<input type="text" id="total" disabled><br />
<label> </label>
<input type="button" id="calculate" value="Calculate">
<input type="button" id="clear" value="Clear"><br />
</div>
</div>
</body>
</html>
2 个解决方案
解决方案1
0 2021-10-12 23:38:04
I have run your code, and have run into one problem that has stopped it from running:我已经运行了您的代码，但遇到了一个问题，使其无法运行：
//validation data
if (subtotal <= 10000000 || tax_rate <= 50) {
alert("sales tax exceeds 10000000 and/ or tax rate exceeds 50");
You have accidentaly mixed around your greater than and less than signs!你不小心混合了大于和小于符号！
It should be:它应该是：
//validation data
if (subtotal >= 10000000 || tax_rate >= 50) {
alert("sales tax exceeds 10000000 and/ or tax rate exceeds 50");
Try this and see if it works.试试这个，看看它是否有效。
解决方案2
0 2021-10-12 23:38:41
You're checking wrong conditions -你正在检查错误的条件 -
if (subtotal <= 10000000 || tax_rate <= 50)
It should be the following condition -应该是以下条件——
if (subtotal >= 10000000 || tax_rate >= 50)
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