javascript - Codeigniter and jQuery - Validate form data -

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i lots of own coding codeigniter+jquery combo. current project has lot's of different kind of inputs, , when data different, have handle differently. 1 field can email field, 1 field can number field has allow numbers , comma etc. got point.

i made easy example how have been doing things. when submit pressed check every input's data regex match , if wrong, change color of input, , inform on field whats wrong. quite simple.

this method works, when have lots of inputs gets messy , hard maintain, , mean have have php fallback if user have disabled javascript. have same checks on jquery , php side.

other thing security. think i'm paranoid exploits/xss attacks, , remove unwanted characters regex , after check other regex if remaining data valid.

i grateful if tell if there better way achieve data handling/validating between codeigniter , jquery.

application/controllers/example.php

<?php if ( ! defined('basepath')) exit('no direct script access allowed');  class example extends ci_controller {    function __construct()   {     parent::__construct();      $this->load->helper('url');   }    public function index()   {     $this->load->view('example_view');   }    public function jquery()   {     echo "username: ". $this->input->post('username');     echo "userage: ". $this->input->post('userage');     echo "useremail: ". $this->input->post('useremail');   } } ?>

application/views/example_view.php

<!doctype html> <html lang="en-us">   <head>     <meta charset="utf-8">     <title>my test</title>      <script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>   </head>    <body>     <div id="status"></div> <br />      <form id="userform">       <label for="username">username:</label>       <input type="text" name="username" id="username" /> <br />        <br />        <label for="userage">age:</label>       <input type="text" name="userage" id="userage" /> </br >        <br />        <label for="useremail">e-mail:</label>       <input type="text" name="useremail" id="useremail" /> </br >        </br >        <input type="submit" name="senddata" value="send it" />     </form>   </body> </html>   <script> $("#userform").submit(function(event) {      event.preventdefault();      var error = 0;      if($("#userform").match('/regexp_here/'))     {       $("#username").addclass('alert');       error++;     }     else     {       $("#username").removeclass('alert');     }      if($("#userage").match('/regexp_here/'))     {       $("#userage").addclass('alert');       error++;     }     else     {       $("#userage").removeclass('alert');     }      if($("#useremail").match('/regexp_here/'))     {       $("#useremail").addclass('alert');       error++;     }     else     {       $("#useremail").removeclass('alert');     }      if(error == 0)     {       $.ajax({         type: 'post',         url: 'example/jquery/',         data: {            username: username,            userage: userage,            useremail: useremail         },         success:function(data)          {           $("status").html(data);         },         error:function()          {           $("status").html("well, error...");         }       });     }     else { } }); </script>


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