Question

JavaScript When the button is pressed, the application should prompt the user to enter a string...

JavaScript
When the button is pressed, the application should prompt the user to enter a string or ‘***’ to quit, and then print output in the text area specifying how many vowels were in the string.
Vowels are the letters: a,e,i,o,u.
The application should then again do the above, until the user enters ‘***’. It should then alert
‘Thanks for using the vowel counter’ and exit.
Engineering   Computer-Science   
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Homework Answers

Answer #1 
<!DOCTYPE html>
<script>
        function myFunction() {
          var str = prompt("enter a string or '***' to quit");
          while(true){
                if(str!='***'){
                        var c = str.match(/[aeiou]/gi).length;
                        document.getElementById("demo").innerHTML +=
                        "Count of vowels in "+str+" is: "+ c+"\n";
                        var str = prompt("enter a string or '***' to quit");
                }
                else
                {
                        alert('Thanks for using the vowel counter');
                        break;
                }
          }
        }
</script>
<html>
        <body>
                <button onclick="myFunction()">Press Button</button><br/><br/>
                <textarea id="demo" rows='10',cols='30'></textarea>
        </body>
</html>

In the above code loop will continue until user enters ***

finally the entire output is displayed in text area.

OUTPUT

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