https://www.easyphp.org/js/signup.js

1$(document).ready(function() {
2	$("#signup-form").submit(function(e){
3		e.preventDefault(); 
4		
5		var $form = $(this),
6		name = $form.find('input[name="name"]').val(),
7		email = $form.find('input[name="email"]').val(),
8		url = $form.attr('action');
9		
10		$.post(url, {name:name, email:email},
11		  function(data) {
12		      if(data)
13		      {
14		      	if(data=="Some fields are missing.")
15		      	{
16			      	$("#status").text("Please fill in your name and email.");
17			      	$("#status").css("color", "red");
18		      	}
19		      	else if(data=="Invalid email address.")
20		      	{
21			      	$("#status").text("Your email address is invalid.");
22			      	$("#status").css("color", "red");
23		      	}
24		      	else if(data=="Invalid list ID.")
25		      	{
26			      	$("#status").text("Your list ID is invalid.");
27			      	$("#status").css("color", "red");
28		      	}
29		      	else if(data=="Already subscribed.")
30		      	{
31			      	$("#status").text("You're already subscribed!");
32			      	$("#status").css("color", "red");
33		      	}
34		      	else
35		      	{
36			      	$("#status").text("You're subscribed!");
37			      	$("#status").css("color", "green");
38		      	}
39		      }
40		      else
41		      {
42		      	alert("Sorry, unable to subscribe. Please try again later!");
43		      }
44		  }
45		);
46	});
47	$("#signup-form").keypress(function(e) {
48		    if(e.keyCode == 13) {
49		    	e.preventDefault(); 
50				$(this).submit();
51		    }
52		});
53	$("#submit-btn").click(function(e){
54		e.preventDefault(); 
55		$("#signup-form").submit();
56	});
57});