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Editorial Team
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Asked: 2026-06-13T01:01:35+00:00

I’m trying my hand on JavaScript and my browser refuses to execute this program

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I’m trying my hand on JavaScript and my browser refuses to execute this program I have written using switch case function. The goal is to find the number of vowels in a string (consider all are in-putted in lower case)

When I click the ‘submit’ button the text from the box goes away but nothing happens.
The alert “hello” also does not appear, so I’m assuming that the function is not even being executed. 

   <html>
   <head>
   <script>
   function vow(form)
    {
     alert("hello");
     var a = new Array(10);
     a = form.t1.value;
     var flag = 0;
     var i;

     for(i=0;i<10;i++)
       {
     switch (a[i])
      {
       case 'a':
       flag++;
       break;

       case 'e':
       flag++;
       break;

       case 'i';
       flag++;
       break;

       case 'o';
       flag++;
       break;

       case 'u';
       flag++;
       break;
      }
      }
  alert(flag);  
  }
  </script>
  </head>

  <body>
  <form>

  <input type="text" name="t1">
  <input type="submit" value="SUBMIT" onClick="vow(this.form)"/>

  </form>
  </body>
  </html>
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1 Answer

  1. Editorial Team

    You are using ; instead of :.

    case 'i';
      __^__

    Same case for o and u.

    Update:

    I also show a (memory intensive) alternative version:

    var count = input.match(/[aeiou]/gi).length;

    Update:

    var vow = function(str) {
    var matches = str.match(/[aeiou]/gi);
    var count = matches ? matches.length : 0;
    alert("'" + str + "' contains " + count + " vowel(s)");
    return false;
}​ ​


    <input type="submit" value="SUBMIT" onClick="return vow(this.form.t1.value)"/>

    You can see it here.

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