I am trying to put some amount, then it will show the calculation if all input will given any number, but I want, when I do not put anything in any one of that input, then the input will count “0” automatically..
<body>
<input type='text' id='aaa'/>
<input type='text' id='bbb'/>
<input type='text' id='ccc'/>
<input type='text' id='answer' name='ans' />
<form name ="testarea" Method="GET" Action="" id='form1'>
<input type="button" onClick="Calculate();" value="calculate"/>
</form>
</body>
<script>
function Calculate()
{
var aaa= document.getElementById('aaa').value;
var bbb= document.getElementById('bbb').value;
var ccc= document.getElementById('ccc').value;
var permin = parseFloat(aaa) * 82;
var permin1 = parseFloat(bbb) * 40;
var permin2 = parseFloat(ccc) * 10;
var permin3=permin+permin1+permin2;
document.getElementById('answer').value=permin3;
document.form1.submit();
}
</script>
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Answer
var aaa= document.getElementById('aaa').value;
var bbb= document.getElementById('bbb').value;
var ccc= document.getElementById('ccc').value;
var permin = (parseFloat(aaa)||0) * 82;
var permin1 = (parseFloat(bbb)||0) * 40;
var permin2 = (parseFloat(ccc)||0) * 10;
var permin3=permin+permin1+permin2;
document.getElementById('answer').value=permin3;
You can use the OR operator to replace NaN with 0 if parseFloat returns NaN.
You could shorten the upper code to:
const ids = ["aaa","bbb","ccc"];
const factors = [82,40,10];
document.getElementById("answer").value = ids.reduce((count,id,index) => {
const { value } = document.getElementById(id);
return count + (parseFloat(value) || 0) * factors[index];
}, 0);