javascript - 用单选按钮制作的计算器的问题
问题描述
我正在尝试用单选按钮制作一个计算器,但由于某种原因,我的代码只读取第一个参数(如果)而忽略了其余部分。即使我可能检查了乘法单选按钮,这也会导致代码执行加法。下面是代码:-
//HTML
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<form>
<input type="number" name="num1" id="num1">
<input type="number" name="num2" id="num2"><br>
<input type="radio" name="add" id="add">Addition(+)
<input type="radio" name="sub" id="sub">Subtraction(-)
<input type="radio" name="mul" id="mul">Multiplication(x)
<input type="radio" name="divi" id="divi">Division(/)
<input type="radio" name="mod" id="mod">Modulus(%)<br>
<button type="submit">submit</button>
<input type="number" name="num3" id="num3">
</form>
<script src="calculator.js"></script>
</body>
</html>
//JAVASCRIPT
const form = document.querySelector('form');
form.addEventListener('submit', e =>{
e.preventDefault();
const num1 = parseInt(document.querySelector('#num1').value);
const num2 = parseInt(document.querySelector('#num2').value);
if(document.getElementById('add').checked = true){
let c = num1+num2;
form.num3.value =c;
}
else if(document.getElementById('sub').checked = true){
let d = num1-num2;
form.num3.value =d;
}
else if(document.getElementById('mul').checked = true){
let e = num1*num2;
form.num3.value =e;
}
else if(document.getElementById('divi').checked = true){
let f = num1/num2;
form.num3.value =f;
}
else if(document.getElementById('mod').checked = true){
let h = num1%num2;
form.num3.value =h;
}
});
解决方案
你的表格是错误的,表格的名称对于每种信息必须是不同的
您不需要使用id
表单的元素(因为您可以通过它们的名称来捕获它们)
您不需要使用 check 属性,而是直接获取单选按钮的元素值
const myForm = document.getElementById('my-form')
myForm.onsubmit=e=>
{
e.preventDefault()
switch(myForm.calc.value)
{
case 'add': myForm.result.value = myForm.num1.valueAsNumber + myForm.num2.valueAsNumber; break;
case 'sub': myForm.result.value = myForm.num1.valueAsNumber - myForm.num2.valueAsNumber; break;
case 'mul': myForm.result.value = myForm.num1.valueAsNumber * myForm.num2.valueAsNumber; break;
case 'div': myForm.result.value = myForm.num1.valueAsNumber / myForm.num2.valueAsNumber; break;
case 'mod': myForm.result.value = myForm.num1.valueAsNumber % myForm.num2.valueAsNumber; break;
default: myForm.result.value = '...';
}
}
/* some cosmetic... */
fieldset { margin: .8em; min-width: 20em;}
label, fieldset { display: block; float: left; clear: both;}
output { display: block; border: 1px solid grey; min-width:4em; text-align: center; padding: .3em; float: right;}
<form id="my-form">
<fieldset>
<input type="number" name="num1" placeholder="first number">
<input type="number" name="num2" placeholder="second number">
</fieldset>
<label> <input type="radio" name="calc" value="add" > Addition (+) </label>
<label> <input type="radio" name="calc" value="sub" > Subtraction (-) </label>
<label> <input type="radio" name="calc" value="mul" > Multiplication (x) </label>
<label> <input type="radio" name="calc" value="div" > Division (/) </label>
<label> <input type="radio" name="calc" value="mod" > Modulus (%) </label>
<fieldset>
<button type="submit"> submit </button>
<output name="result" >...</output>
</fieldset>
</form>
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