基本的javascript华氏温度/摄氏计算器 [英] Basic javascript Fahrenheit/Celsius calculator
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问题描述
我正在尝试做摄氏/华氏转换计算器，每个转换都有一个按钮，结果显示在相应的文本框中。我必须在这里忽略一些显而易见的东西......我是JavaScript的品牌，但我没有得到它。这是我迄今为止所做的：
I'm trying to do a Celsius/Fahrenheit conversion calculator, with a button for each conversion and the result being displayed in the appropriate textbox. I must be missing something obvious here... I'm brand new to javascript and am just not getting it. Here's what I have done so far:
<!DOCTYPE html>
<html>
<head>
<meta charset = "utf-8"/>
<title>Convert Fahrenheit and Celsius</title>
<script type="text/javascript">
<!--
function convertToC() {
var fTempVal = parseFloat(document.getElementById('fTemp').value);
var cTempVal = (fTempVal - 32) * (5/9);
document.getElementById('cTemp').value = cTempVal;
}
function convertToF() {
var cTempVal = parseFloat(document.getElementById('cTemp').value);
var fTempVal = (cTempVal * (9/5)) + 32;
document.getElementById('fTemp').value = fTempVal;
}
// -->
</script>
</head>
<body>
<form name="conversionForm">
<table border="1">
<tbody>
<tr>
<td>Fahrenheit</td>
<td><input name="fTemp" type="text"/></td>
<td><button onclick="convertToC">Convert to Celsius</button></td>
</tr>
<tr>
<td>Celsius</td>
<td><input name="cTemp" type="text"/></td>
<td><button onclick="convertToF">Convert to Fahrenheit</button></td>
</tr>
</form>
</tbody>
</table>
</body>
</html>
推荐答案
您有一些错误。请参阅此更正的 jsFiddle示例 。
You have a few errors. See this corrected jsFiddle example.
- 您的输入框缺少您尝试引用的标识
document.getElementById - 您的HTML不正确地关闭。
- 您的按钮缺少使其成为默认提交，当你真的想要按钮时
- 为了防止实际提交表单，您应该返回false。
- Your input boxes were missing IDs that you were trying to reference with
document.getElementById - Your HTML was improperly closed.
- Your buttons were missing types which makes them default to submit when you really wanted just button
- To prevent the form from actually being submitted you should return false.
$ b $ JavaScript
JavaScript
function convertToC() {
var fTempVal = parseFloat(document.getElementById('fTemp').value);
var cTempVal = (fTempVal - 32) * (5 / 9);
document.getElementById('cTemp').value = cTempVal;
return false;
}
function convertToF() {
var cTempVal = parseFloat(document.getElementById('cTemp').value);
var fTempVal = (cTempVal * (9 / 5)) + 32;
console.log(fTempVal);
document.getElementById('fTemp').value = fTempVal;
return false;
}
HTML $ b
HTML
<form name="conversionForm">
<table border="1">
<tbody>
<tr>
<td>Fahrenheit</td>
<td>
<input name="fTemp" id="fTemp" type="text" />
</td>
<td>
<button type="button" onclick="convertToC();return false">Convert to Celsius</button>
</td>
</tr>
<tr>
<td>Celsius</td>
<td>
<input name="cTemp" id="cTemp" type="text" />
</td>
<td>
<button type="button" onclick="convertToF();return false">Convert to Fahrenheit</button>
</td>
</tr>
</tbody>
</table>
</form>
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