Programming Examples
Write a JavaScript program which accept a string as input and swap the case of each character.
Write a JavaScript program which accept a string as input and swap the case of each character.
For example: if you input 'The Quick Brown Fox' the output should be 'tHE qUICK bROWN fOX'.
Solution<!DOCTYPE HTML>
<html>
<head>
<title>Swap the Case</title>
<style type="text/css">
.error_msg
{
color:#ff0000;
font-style:italic;
}
</style>
<script language="javascript">
function swap_case()
{
var data=document.getElementById('user_txt').value;
var output='';
document.getElementById('error').innerHTML="";
document.getElementById('result').innerHTML="";
var i,j;
if(data=="")
{
document.getElementById('error').innerHTML="Please Enter the text";
}
else
{
for(i=0; i<data.length; i++)
{
if(data.charCodeAt(i)>=65&&data.charCodeAt(i)<=90)
{
output+=data.charAt(i).toLowerCase();
}
else if(data.charCodeAt(i)>=97&&data.charCodeAt(i)<=122)
{
output+=data.charAt(i).toUpperCase();
}
else
{
output+=data.charAt(i);
}
}
document.getElementById('result').innerHTML=output;
}
}
</script>
</head>
<body>
<form name="frm" id="frm">
<div>
<label for="user_txt">Enter the Text</label>
</div>
<div>
<textarea name="user_txt" id="user_txt" rows="10" cols="30"></textarea>
<span class="error_msg" id="error"></span>
</div>
<div>
<input type="button" name="check_btn" id="check_btn" value="Swap the Case" onclick="swap_case()"/>
</div>
<div>
<h3>Output</h3>
<span id="result"></span>
</div>
</form>
</body>
</html>Output/ Explanation: