JavaScript Program to Count Vowels in a Given String
Write a JavaScript function to count the number of vowels in a given string.
Source Code
<html>
<head>
<title>Count vowels in given string</title>
<script>
function countVowels()
{
var i=0, count=0;
var ch;
var txt = document.getElementById('txt').value;
for(var i=0; i<txt.length; i++)
{
ch = txt.charAt(i);
if(ch == 'a' || ch == 'A' || ch == 'e' || ch == 'E' || ch == 'i' ||
ch == 'I' || ch == 'o' || ch == 'O' || ch == 'u' || ch == 'U')
{
count++;
}
}
document.getElementById('panel').innerHTML = "No. of vowels in given string: " + count;
}
</script>
</head>
<body>
Enter some text<br/>
<textarea rows="2" cols="20" id="txt"></textarea><br/>
<input type="button" value="COUNT VOWELS" onclick="countVowels()"/>
<p id="panel">No. of vowels in given string: 0</p>
</body>
</html>
Output
