jquery replace all spaces in string
<body>
Title : <input type="text" id="title"><br/>
Keyword : <input type="text" id="keyword">
</body>
<script>
$('#title').keyup(function() {
var replaceSpace = $(this).val();
// regular expression / /g ()
// The flag g means global. It causes all matches to be replaced
var result = replaceSpace.replace(/ /g, ";");
$("#keyword").val(result);
});
</script>