Below is the JavaScript to convert between pound and Kg in mass:
<html>
<head>
<title>JavaScript to convert unit</title>
<h1>Convert between kg and pound in mass</h1>
<script language='JavaScript' type='text/JavaScript'>
function validate(type) {
if(document.form1.textinput.value=='')
{
alert('Fill the Input box before submitting');
return false;
} else {
var res0=document.form1.textinput.value;
var unit1=" lb";
var unit2=" kg";
if(type=="to_lb"){
var res=2.20462*res0;
document.getElementById("result").innerHTML=res0+unit2+" = "+res.toFixed(2) + unit1;
}else{
var res=0.453592*res0;
document.getElementById("result").innerHTML=res0+unit1+" = "+res.toFixed(2) + unit2;
}
return false;
}
}
</script>
</head>
<body>
<form name='form1' action='' method='post'
onSubmit='return validate();'>
Input :<input type=text name=textinput size=10>
<input type=button value='Convert to Kg' onClick=validate('to_kg');>
<input type=button value='Convert to Pound' onClick=validate('to_lb');>
</form>
<div id=result></div>
</body>
</html>
Demo:
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