I want to create a chat or rtc system

I want to create a chat or rtc system

Chat System
Hello best learners,
I am creating a chat system. I am sending a form data through ajax method
in jquery. My first problem is ajax method is not sending data to
proccess.php and page goes to redirect to its self.
<div id="chatOutput"></div>
<form id="myform">
<textarea id="chatInput" name="chatInput"></textarea>
<input type="submit" id="send" name="send" value="send" />
</form>
and script is :
$('#send').click( function() {
$('#myform').submit();
$.ajax({
url: 'process.php',
type: 'post',
dataType: 'json',
data: $('#myform').serialize(),
success: function() {
alert("Submitted!"); // for testing
}
});
return false;
});
but script is not working and page goes to refresh and i see the variables
and its values in the address bar like get method.
if this problem goes to solve, process.php will create a chat.txt and
append data from #chatInput into it. and then will append chat.txt 's data
to #chatOutput.
After appending data, div#chatOutput 's size goes to change. I want to
fixed/specified width and height of this div. After the fixing size, how
to scroll to bottom to see the last chatting?