javascript - Count the vowels of an input? -


hi trying count vowels of input of form in html using javascript no success.

here html

<!doctype html> <html> <head>     <script src='p3-vowels.js'></script> </head> <body>     <form action="demo_form.asp">     phrase: <input type="text" id = "input1" name="countvowels" value="put   phrase here"><br>     <input type="button" id = "btn1" value="check vowels">     </form> </body> </html>

and here javascript

function vow(form){     var = form.countvowels.value;         flag = 0;      (var = 0; < a.length; i++){         switch (a[i]){             case 'a'             case 'e'             case 'i'             case 'o'             case 'u'                 flag++;                 break;         }     }     alert(flag); }  function init(){     var button1 = document.getelementbyid("btn1")     button1.onclick = vow; }  window.onload = init;

another option other answers use regular expression. not easier understand, or particularly efficient, i'm giving alternative. (it continues prove proverb: give 100 programmers problem solve , you'll 100 solutions)

the following expression used in javascript match vowels, , can use returning array see how many there are...

/[aeiou]/ig

the i makes case insensitive, , g means global pick multiple times.

here in action...

function vow(form){    var = form.countvowels.value;    var matches = a.match(/[aeiou]/ig);    var flag = 0;    if (matches != null)      flag = matches.length;    alert(flag);  }    function init(){    var button1 = document.getelementbyid("btn1")    button1.onclick = function() { vow(document.getelementbyid("myform")); }  }    window.onload = init;    
<form id="myform" action="demo_form.asp">    phrase: <input type="text" id = "input1" name="countvowels" value="put   phrase here"><br>    <input type="button" id = "btn1" value="check vowels">  </form>


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