In this sample program, we will show you how to count the capital and small letters in a given sentence using JavaScript.
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Sample Program Output
Program Listing
<html>
<head>
<title>Count Capital and Small Letters in JavaScript</title>
<style>
body{
font-family:arial;
font-size:15px;
font-weight:bold;
}
</style>
<script language="javascript">
function count_all()
{
if (document.getElementById("str").value == '') {
alert("Textbox is Empty !!! Please provide some string.");
document.getElementById("str").value = "";
document.getElementById("upper_str").value = "";
document.getElementById("lower_str").value = "";
document.getElementById("str").focus();
}
else {
var str1 = document.getElementById("str").value;
var numUpper = str1.length - str1.replace(/[A-Z]/g, '').length;
var numLower = str1.length - str1.replace(/[a-z]/g, '').length;
var result = document.getElementById("upper_str");
var result2 = document.getElementById("lower_str");
result.value = numUpper;
result2.value = numLower;
}
}
function clear_all()
{
document.getElementById("str").value = "";
document.getElementById("upper_str").value = "";
document.getElementById("lower_str").value = "";
document.getElementById("str").focus();
}
</script>
</head>
<body>
<br><br>
<h3>Count Capital and Small Letters in JavaScript</h3>
<br>
Enter a String <input type="text" id="str" name="str" value="" size="30" autofocus/>
<br><br>
<input type="button" name="Submit" value="Count" onclick="javascript:count_all()"
title="Click here to count the capital and small letters."/>
<input type="button" name="Submit" value="Clear" onclick="javascript:clear_all()"
title="Click here to clear the text box."/>
<br><br><br><br>
Number of Capital Letter(s) is <input type="text" id="upper_str" name="upper_str" size="3"/>
<br><br>
Number of Small Letter(s) is <input type="text" id="lower_str" name="lower_str" size="3"/>
</body>
</html>
