A simple program to ask the user to give radius value and then the program will convert the given radius into area of the circle using JavaScript programming language,

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Program Listing
<html>
   <title>Area of the Circle in JavaScript</title>
 <style type="text/css">

 body {

 	font-family: arial;
 	font-weight: bold;
 	font-size:15px;
 	 }
 
 form
{
  display: inline-block;
  background-color: lightblue;
  padding: 6px;
}

label{
  display: block;
  direction: rtl; 
}

input{
  direction: ltr; 
}

label::after{
  content: attr(data-text);
}
 </style>

<script language="JavaScript">

function Solve(){

if (document.circle.radius.value === "" || document.circle.radius.value === "0" ) {
  alert("Cannot be empty. Try Again");
  document.circle.radius.focus();
} else {

a = parseInt(document.circle.radius.value);

result = "The area of the circle is " + (a * a * Math.PI).toFixed(2);
document.getElementById("tag").innerHTML = result;
  }
}

function Clear() {
document.circle.radius.value ="";
document.getElementById("tag").innerHTML = "";
document.circle.radius.focus();
 }

</script>
<body>
<br>
<h3>Area of the Circle in JavaScript</h3>
<form name="circle">
<label data-text="Enter the radius of circle">&nbsp;&nbsp;
<input type="number" name="radius" autofocus required>
</label>
<br/>
<span id="tag"></span>
 <br><br>
<input type="button" value="Convert" title="Click here to solve." onclick="Solve()" />
<input type="button" value="Clear"  
title="Click here to clear the text box."
onclick="Clear()"/>
</form>
</body>
</html>

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