bee,
<head lang="en">
<meta charset="UTF-8">
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<title></title>
<script>
$(document).ready(function(event){
$("#form1").submit(function(event){
event.preventDefault();
var str = ""
$("input[type=text]").each(function(){
str += $(this).val()+" ";
});
$("#rez").val(str);
});
});
</script>
</head>
<body>
<form action="json.txt" id="form1">
<input type="text" name="bublik" value="1">
<input type="text" name="bublik2" value="2">
<input type="text" name="bublik" value="3">
<input type="submit" value="Ready" name="write" class="button" >
</form>
<textarea name="text" id="rez" rows="10" cols="150" class="enter" ></textarea>
</body>